Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

23 files changed, 1583 insertions, 0 deletions

diff --git a/vendor/getrandom/src/3ds.rs b/vendor/getrandom/src/3ds.rs
new file mode 100644
index 000000000..60305127e
--- /dev/null
+++ b/vendor/getrandom/src/3ds.rs
@@ -0,0 +1,17 @@
+// Copyright 2021 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Implementation for Nintendo 3DS
+use crate::util_libc::sys_fill_exact;
+use crate::Error;
+
+pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {
+    sys_fill_exact(dest, |buf| unsafe {
+        libc::getrandom(buf.as_mut_ptr() as *mut libc::c_void, buf.len(), 0)
+    })
+}
diff --git a/vendor/getrandom/src/bsd_arandom.rs b/vendor/getrandom/src/bsd_arandom.rs
new file mode 100644
index 000000000..f26f2609c
--- /dev/null
+++ b/vendor/getrandom/src/bsd_arandom.rs
@@ -0,0 +1,52 @@
+// Copyright 2018 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Implementation for FreeBSD and NetBSD
+use crate::{util_libc::sys_fill_exact, Error};
+use core::ptr;
+
+fn kern_arnd(buf: &mut [u8]) -> libc::ssize_t {
+    static MIB: [libc::c_int; 2] = [libc::CTL_KERN, libc::KERN_ARND];
+    let mut len = buf.len();
+    let ret = unsafe {
+        libc::sysctl(
+            MIB.as_ptr(),
+            MIB.len() as libc::c_uint,
+            buf.as_mut_ptr() as *mut _,
+            &mut len,
+            ptr::null(),
+            0,
+        )
+    };
+    if ret == -1 {
+        -1
+    } else {
+        len as libc::ssize_t
+    }
+}
+
+pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {
+    #[cfg(target_os = "freebsd")]
+    {
+        use crate::util_libc::Weak;
+        static GETRANDOM: Weak = unsafe { Weak::new("getrandom\0") };
+        type GetRandomFn =
+            unsafe extern "C" fn(*mut u8, libc::size_t, libc::c_uint) -> libc::ssize_t;
+
+        if let Some(fptr) = GETRANDOM.ptr() {
+            let func: GetRandomFn = unsafe { core::mem::transmute(fptr) };
+            return sys_fill_exact(dest, |buf| unsafe { func(buf.as_mut_ptr(), buf.len(), 0) });
+        }
+    }
+    // Both FreeBSD and NetBSD will only return up to 256 bytes at a time, and
+    // older NetBSD kernels will fail on longer buffers.
+    for chunk in dest.chunks_mut(256) {
+        sys_fill_exact(chunk, kern_arnd)?
+    }
+    Ok(())
+}
diff --git a/vendor/getrandom/src/custom.rs b/vendor/getrandom/src/custom.rs
new file mode 100644
index 000000000..6110b0563
--- /dev/null
+++ b/vendor/getrandom/src/custom.rs
@@ -0,0 +1,102 @@
+// Copyright 2018 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! An implementation which calls out to an externally defined function.
+use crate::Error;
+use core::num::NonZeroU32;
+
+/// Register a function to be invoked by `getrandom` on unsupported targets.
+///
+/// ## Writing a custom `getrandom` implementation
+///
+/// The function to register must have the same signature as
+/// [`getrandom::getrandom`](crate::getrandom). The function can be defined
+/// wherever you want, either in root crate or a dependent crate.
+///
+/// For example, if we wanted a `failure-getrandom` crate containing an
+/// implementation that always fails, we would first depend on `getrandom`
+/// (for the [`Error`] type) in `failure-getrandom/Cargo.toml`:
+/// ```toml
+/// [dependencies]
+/// getrandom = "0.2"
+/// ```
+/// Note that the crate containing this function does **not** need to enable the
+/// `"custom"` Cargo feature.
+///
+/// Next, in `failure-getrandom/src/lib.rs`, we define our function:
+/// ```rust
+/// use core::num::NonZeroU32;
+/// use getrandom::Error;
+///
+/// // Some application-specific error code
+/// const MY_CUSTOM_ERROR_CODE: u32 = Error::CUSTOM_START + 42;
+/// pub fn always_fail(buf: &mut [u8]) -> Result<(), Error> {
+///     let code = NonZeroU32::new(MY_CUSTOM_ERROR_CODE).unwrap();
+///     Err(Error::from(code))
+/// }
+/// ```
+///
+/// ## Registering a custom `getrandom` implementation
+///
+/// Functions can only be registered in the root binary crate. Attempting to
+/// register a function in a non-root crate will result in a linker error.
+/// This is similar to
+/// [`#[panic_handler]`](https://doc.rust-lang.org/nomicon/panic-handler.html) or
+/// [`#[global_allocator]`](https://doc.rust-lang.org/edition-guide/rust-2018/platform-and-target-support/global-allocators.html),
+/// where helper crates define handlers/allocators but only the binary crate
+/// actually _uses_ the functionality.
+///
+/// To register the function, we first depend on `failure-getrandom` _and_
+/// `getrandom` in `Cargo.toml`:
+/// ```toml
+/// [dependencies]
+/// failure-getrandom = "0.1"
+/// getrandom = { version = "0.2", features = ["custom"] }
+/// ```
+///
+/// Then, we register the function in `src/main.rs`:
+/// ```rust
+/// # mod failure_getrandom { pub fn always_fail(_: &mut [u8]) -> Result<(), getrandom::Error> { unimplemented!() } }
+/// use failure_getrandom::always_fail;
+/// use getrandom::register_custom_getrandom;
+///
+/// register_custom_getrandom!(always_fail);
+/// ```
+///
+/// Now any user of `getrandom` (direct or indirect) on this target will use the
+/// registered function. As noted in the
+/// [top-level documentation](index.html#custom-implementations) this
+/// registration only has an effect on unsupported targets.
+#[macro_export]
+#[cfg_attr(docsrs, doc(cfg(feature = "custom")))]
+macro_rules! register_custom_getrandom {
+    ($path:path) => {
+        // We use an extern "C" function to get the guarantees of a stable ABI.
+        #[no_mangle]
+        extern "C" fn __getrandom_custom(dest: *mut u8, len: usize) -> u32 {
+            let f: fn(&mut [u8]) -> Result<(), ::getrandom::Error> = $path;
+            let slice = unsafe { ::core::slice::from_raw_parts_mut(dest, len) };
+            match f(slice) {
+                Ok(()) => 0,
+                Err(e) => e.code().get(),
+            }
+        }
+    };
+}
+
+#[allow(dead_code)]
+pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {
+    extern "C" {
+        fn __getrandom_custom(dest: *mut u8, len: usize) -> u32;
+    }
+    let ret = unsafe { __getrandom_custom(dest.as_mut_ptr(), dest.len()) };
+    match NonZeroU32::new(ret) {
+        None => Ok(()),
+        Some(code) => Err(Error::from(code)),
+    }
+}
diff --git a/vendor/getrandom/src/dragonfly.rs b/vendor/getrandom/src/dragonfly.rs
new file mode 100644
index 000000000..f27e90690
--- /dev/null
+++ b/vendor/getrandom/src/dragonfly.rs
@@ -0,0 +1,26 @@
+// Copyright 2021 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Implementation for DragonFly BSD
+use crate::{
+    use_file,
+    util_libc::{sys_fill_exact, Weak},
+    Error,
+};
+
+pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {
+    static GETRANDOM: Weak = unsafe { Weak::new("getrandom\0") };
+    type GetRandomFn = unsafe extern "C" fn(*mut u8, libc::size_t, libc::c_uint) -> libc::ssize_t;
+
+    if let Some(fptr) = GETRANDOM.ptr() {
+        let func: GetRandomFn = unsafe { core::mem::transmute(fptr) };
+        return sys_fill_exact(dest, |buf| unsafe { func(buf.as_mut_ptr(), buf.len(), 0) });
+    } else {
+        use_file::getrandom_inner(dest)
+    }
+}
diff --git a/vendor/getrandom/src/error.rs b/vendor/getrandom/src/error.rs
new file mode 100644
index 000000000..661575376
--- /dev/null
+++ b/vendor/getrandom/src/error.rs
@@ -0,0 +1,191 @@
+// Copyright 2018 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+use core::{fmt, num::NonZeroU32};
+
+/// A small and `no_std` compatible error type
+///
+/// The [`Error::raw_os_error()`] will indicate if the error is from the OS, and
+/// if so, which error code the OS gave the application. If such an error is
+/// encountered, please consult with your system documentation.
+///
+/// Internally this type is a NonZeroU32, with certain values reserved for
+/// certain purposes, see [`Error::INTERNAL_START`] and [`Error::CUSTOM_START`].
+///
+/// *If this crate's `"std"` Cargo feature is enabled*, then:
+/// - [`getrandom::Error`][Error] implements
+///   [`std::error::Error`](https://doc.rust-lang.org/std/error/trait.Error.html)
+/// - [`std::io::Error`](https://doc.rust-lang.org/std/io/struct.Error.html) implements
+///   [`From<getrandom::Error>`](https://doc.rust-lang.org/std/convert/trait.From.html).
+#[derive(Copy, Clone, Eq, PartialEq)]
+pub struct Error(NonZeroU32);
+
+const fn internal_error(n: u16) -> Error {
+    // SAFETY: code > 0 as INTERNAL_START > 0 and adding n won't overflow a u32.
+    let code = Error::INTERNAL_START + (n as u32);
+    Error(unsafe { NonZeroU32::new_unchecked(code) })
+}
+
+impl Error {
+    /// This target/platform is not supported by `getrandom`.
+    pub const UNSUPPORTED: Error = internal_error(0);
+    /// The platform-specific `errno` returned a non-positive value.
+    pub const ERRNO_NOT_POSITIVE: Error = internal_error(1);
+    /// Call to iOS [`SecRandomCopyBytes`](https://developer.apple.com/documentation/security/1399291-secrandomcopybytes) failed.
+    pub const IOS_SEC_RANDOM: Error = internal_error(3);
+    /// Call to Windows [`RtlGenRandom`](https://docs.microsoft.com/en-us/windows/win32/api/ntsecapi/nf-ntsecapi-rtlgenrandom) failed.
+    pub const WINDOWS_RTL_GEN_RANDOM: Error = internal_error(4);
+    /// RDRAND instruction failed due to a hardware issue.
+    pub const FAILED_RDRAND: Error = internal_error(5);
+    /// RDRAND instruction unsupported on this target.
+    pub const NO_RDRAND: Error = internal_error(6);
+    /// The browser does not have support for `self.crypto`.
+    pub const WEB_CRYPTO: Error = internal_error(7);
+    /// The browser does not have support for `crypto.getRandomValues`.
+    pub const WEB_GET_RANDOM_VALUES: Error = internal_error(8);
+    /// On VxWorks, call to `randSecure` failed (random number generator is not yet initialized).
+    pub const VXWORKS_RAND_SECURE: Error = internal_error(11);
+    /// NodeJS does not have support for the `crypto` module.
+    pub const NODE_CRYPTO: Error = internal_error(12);
+    /// NodeJS does not have support for `crypto.randomFillSync`.
+    pub const NODE_RANDOM_FILL_SYNC: Error = internal_error(13);
+
+    /// Codes below this point represent OS Errors (i.e. positive i32 values).
+    /// Codes at or above this point, but below [`Error::CUSTOM_START`] are
+    /// reserved for use by the `rand` and `getrandom` crates.
+    pub const INTERNAL_START: u32 = 1 << 31;
+
+    /// Codes at or above this point can be used by users to define their own
+    /// custom errors.
+    pub const CUSTOM_START: u32 = (1 << 31) + (1 << 30);
+
+    /// Extract the raw OS error code (if this error came from the OS)
+    ///
+    /// This method is identical to [`std::io::Error::raw_os_error()`][1], except
+    /// that it works in `no_std` contexts. If this method returns `None`, the
+    /// error value can still be formatted via the `Display` implementation.
+    ///
+    /// [1]: https://doc.rust-lang.org/std/io/struct.Error.html#method.raw_os_error
+    #[inline]
+    pub fn raw_os_error(self) -> Option<i32> {
+        if self.0.get() < Self::INTERNAL_START {
+            match () {
+                #[cfg(target_os = "solid_asp3")]
+                // On SOLID, negate the error code again to obtain the original
+                // error code.
+                () => Some(-(self.0.get() as i32)),
+                #[cfg(not(target_os = "solid_asp3"))]
+                () => Some(self.0.get() as i32),
+            }
+        } else {
+            None
+        }
+    }
+
+    /// Extract the bare error code.
+    ///
+    /// This code can either come from the underlying OS, or be a custom error.
+    /// Use [`Error::raw_os_error()`] to disambiguate.
+    #[inline]
+    pub const fn code(self) -> NonZeroU32 {
+        self.0
+    }
+}
+
+cfg_if! {
+    if #[cfg(unix)] {
+        fn os_err(errno: i32, buf: &mut [u8]) -> Option<&str> {
+            let buf_ptr = buf.as_mut_ptr() as *mut libc::c_char;
+            if unsafe { libc::strerror_r(errno, buf_ptr, buf.len()) } != 0 {
+                return None;
+            }
+
+            // Take up to trailing null byte
+            let n = buf.len();
+            let idx = buf.iter().position(|&b| b == 0).unwrap_or(n);
+            core::str::from_utf8(&buf[..idx]).ok()
+        }
+    } else if #[cfg(target_os = "wasi")] {
+        fn os_err(errno: i32, _buf: &mut [u8]) -> Option<wasi::Error> {
+            wasi::Error::from_raw_error(errno as _)
+        }
+    } else {
+        fn os_err(_errno: i32, _buf: &mut [u8]) -> Option<&str> {
+            None
+        }
+    }
+}
+
+impl fmt::Debug for Error {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let mut dbg = f.debug_struct("Error");
+        if let Some(errno) = self.raw_os_error() {
+            dbg.field("os_error", &errno);
+            let mut buf = [0u8; 128];
+            if let Some(err) = os_err(errno, &mut buf) {
+                dbg.field("description", &err);
+            }
+        } else if let Some(desc) = internal_desc(*self) {
+            dbg.field("internal_code", &self.0.get());
+            dbg.field("description", &desc);
+        } else {
+            dbg.field("unknown_code", &self.0.get());
+        }
+        dbg.finish()
+    }
+}
+
+impl fmt::Display for Error {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        if let Some(errno) = self.raw_os_error() {
+            let mut buf = [0u8; 128];
+            match os_err(errno, &mut buf) {
+                Some(err) => err.fmt(f),
+                None => write!(f, "OS Error: {}", errno),
+            }
+        } else if let Some(desc) = internal_desc(*self) {
+            f.write_str(desc)
+        } else {
+            write!(f, "Unknown Error: {}", self.0.get())
+        }
+    }
+}
+
+impl From<NonZeroU32> for Error {
+    fn from(code: NonZeroU32) -> Self {
+        Self(code)
+    }
+}
+
+fn internal_desc(error: Error) -> Option<&'static str> {
+    match error {
+        Error::UNSUPPORTED => Some("getrandom: this target is not supported"),
+        Error::ERRNO_NOT_POSITIVE => Some("errno: did not return a positive value"),
+        Error::IOS_SEC_RANDOM => Some("SecRandomCopyBytes: iOS Security framework failure"),
+        Error::WINDOWS_RTL_GEN_RANDOM => Some("RtlGenRandom: Windows system function failure"),
+        Error::FAILED_RDRAND => Some("RDRAND: failed multiple times: CPU issue likely"),
+        Error::NO_RDRAND => Some("RDRAND: instruction not supported"),
+        Error::WEB_CRYPTO => Some("Web Crypto API is unavailable"),
+        Error::WEB_GET_RANDOM_VALUES => Some("Web API crypto.getRandomValues is unavailable"),
+        Error::VXWORKS_RAND_SECURE => Some("randSecure: VxWorks RNG module is not initialized"),
+        Error::NODE_CRYPTO => Some("Node.js crypto module is unavailable"),
+        Error::NODE_RANDOM_FILL_SYNC => Some("Node.js API crypto.randomFillSync is unavailable"),
+        _ => None,
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::Error;
+    use core::mem::size_of;
+
+    #[test]
+    fn test_size() {
+        assert_eq!(size_of::<Error>(), 4);
+        assert_eq!(size_of::<Result<(), Error>>(), 4);
+    }
+}
diff --git a/vendor/getrandom/src/error_impls.rs b/vendor/getrandom/src/error_impls.rs
new file mode 100644
index 000000000..61f46d227
--- /dev/null
+++ b/vendor/getrandom/src/error_impls.rs
@@ -0,0 +1,24 @@
+// Copyright 2018 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+#![cfg_attr(docsrs, doc(cfg(feature = "std")))]
+extern crate std;
+
+use crate::Error;
+use core::convert::From;
+use std::io;
+
+impl From<Error> for io::Error {
+    fn from(err: Error) -> Self {
+        match err.raw_os_error() {
+            Some(errno) => io::Error::from_raw_os_error(errno),
+            None => io::Error::new(io::ErrorKind::Other, err),
+        }
+    }
+}
+
+impl std::error::Error for Error {}
diff --git a/vendor/getrandom/src/espidf.rs b/vendor/getrandom/src/espidf.rs
new file mode 100644
index 000000000..dce8a2aa0
--- /dev/null
+++ b/vendor/getrandom/src/espidf.rs
@@ -0,0 +1,26 @@
+// Copyright 2021 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Implementation for ESP-IDF
+use crate::Error;
+use core::ffi::c_void;
+
+extern "C" {
+    fn esp_fill_random(buf: *mut c_void, len: usize) -> u32;
+}
+
+pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {
+    // Not that NOT enabling WiFi, BT, or the voltage noise entropy source (via `bootloader_random_enable`)
+    // will cause ESP-IDF to return pseudo-random numbers based on the voltage noise entropy, after the initial boot process:
+    // https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/system/random.html
+    //
+    // However tracking if some of these entropy sources is enabled is way too difficult to implement here
+    unsafe { esp_fill_random(dest.as_mut_ptr().cast(), dest.len()) };
+
+    Ok(())
+}
diff --git a/vendor/getrandom/src/fuchsia.rs b/vendor/getrandom/src/fuchsia.rs
new file mode 100644
index 000000000..572ff5344
--- /dev/null
+++ b/vendor/getrandom/src/fuchsia.rs
@@ -0,0 +1,20 @@
+// Copyright 2018 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Implementation for Fuchsia Zircon
+use crate::Error;
+
+#[link(name = "zircon")]
+extern "C" {
+    fn zx_cprng_draw(buffer: *mut u8, length: usize);
+}
+
+pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {
+    unsafe { zx_cprng_draw(dest.as_mut_ptr(), dest.len()) }
+    Ok(())
+}
diff --git a/vendor/getrandom/src/ios.rs b/vendor/getrandom/src/ios.rs
new file mode 100644
index 000000000..226de16bd
--- /dev/null
+++ b/vendor/getrandom/src/ios.rs
@@ -0,0 +1,27 @@
+// Copyright 2018 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Implementation for iOS
+use crate::Error;
+use core::{ffi::c_void, ptr::null};
+
+#[link(name = "Security", kind = "framework")]
+extern "C" {
+    fn SecRandomCopyBytes(rnd: *const c_void, count: usize, bytes: *mut u8) -> i32;
+}
+
+pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {
+    // Apple's documentation guarantees kSecRandomDefault is a synonym for NULL.
+    let ret = unsafe { SecRandomCopyBytes(null(), dest.len(), dest.as_mut_ptr()) };
+    // errSecSuccess (from SecBase.h) is always zero.
+    if ret != 0 {
+        Err(Error::IOS_SEC_RANDOM)
+    } else {
+        Ok(())
+    }
+}
diff --git a/vendor/getrandom/src/js.rs b/vendor/getrandom/src/js.rs
new file mode 100644
index 000000000..e910f2bc6
--- /dev/null
+++ b/vendor/getrandom/src/js.rs
@@ -0,0 +1,129 @@
+// Copyright 2018 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+use crate::Error;
+
+extern crate std;
+use std::thread_local;
+
+use js_sys::{global, Uint8Array};
+use wasm_bindgen::{prelude::wasm_bindgen, JsCast, JsValue};
+
+// Maximum is 65536 bytes see https://developer.mozilla.org/en-US/docs/Web/API/Crypto/getRandomValues
+const BROWSER_CRYPTO_BUFFER_SIZE: usize = 256;
+
+enum RngSource {
+    Node(NodeCrypto),
+    Browser(BrowserCrypto, Uint8Array),
+}
+
+// JsValues are always per-thread, so we initialize RngSource for each thread.
+//   See: https://github.com/rustwasm/wasm-bindgen/pull/955
+thread_local!(
+    static RNG_SOURCE: Result<RngSource, Error> = getrandom_init();
+);
+
+pub(crate) fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {
+    RNG_SOURCE.with(|result| {
+        let source = result.as_ref().map_err(|&e| e)?;
+
+        match source {
+            RngSource::Node(n) => {
+                if n.random_fill_sync(dest).is_err() {
+                    return Err(Error::NODE_RANDOM_FILL_SYNC);
+                }
+            }
+            RngSource::Browser(crypto, buf) => {
+                // getRandomValues does not work with all types of WASM memory,
+                // so we initially write to browser memory to avoid exceptions.
+                for chunk in dest.chunks_mut(BROWSER_CRYPTO_BUFFER_SIZE) {
+                    // The chunk can be smaller than buf's length, so we call to
+                    // JS to create a smaller view of buf without allocation.
+                    let sub_buf = buf.subarray(0, chunk.len() as u32);
+
+                    if crypto.get_random_values(&sub_buf).is_err() {
+                        return Err(Error::WEB_GET_RANDOM_VALUES);
+                    }
+                    sub_buf.copy_to(chunk);
+                }
+            }
+        };
+        Ok(())
+    })
+}
+
+fn getrandom_init() -> Result<RngSource, Error> {
+    let global: Global = global().unchecked_into();
+    if is_node(&global) {
+        let crypto = NODE_MODULE
+            .require("crypto")
+            .map_err(|_| Error::NODE_CRYPTO)?;
+        return Ok(RngSource::Node(crypto));
+    }
+
+    // Assume we are in some Web environment (browser or web worker). We get
+    // `self.crypto` (called `msCrypto` on IE), so we can call
+    // `crypto.getRandomValues`. If `crypto` isn't defined, we assume that
+    // we are in an older web browser and the OS RNG isn't available.
+    let crypto = match (global.crypto(), global.ms_crypto()) {
+        (c, _) if c.is_object() => c,
+        (_, c) if c.is_object() => c,
+        _ => return Err(Error::WEB_CRYPTO),
+    };
+
+    let buf = Uint8Array::new_with_length(BROWSER_CRYPTO_BUFFER_SIZE as u32);
+    Ok(RngSource::Browser(crypto, buf))
+}
+
+// Taken from https://www.npmjs.com/package/browser-or-node
+fn is_node(global: &Global) -> bool {
+    let process = global.process();
+    if process.is_object() {
+        let versions = process.versions();
+        if versions.is_object() {
+            return versions.node().is_string();
+        }
+    }
+    false
+}
+
+#[wasm_bindgen]
+extern "C" {
+    type Global; // Return type of js_sys::global()
+
+    // Web Crypto API (https://www.w3.org/TR/WebCryptoAPI/)
+    #[wasm_bindgen(method, getter, js_name = "msCrypto")]
+    fn ms_crypto(this: &Global) -> BrowserCrypto;
+    #[wasm_bindgen(method, getter)]
+    fn crypto(this: &Global) -> BrowserCrypto;
+    type BrowserCrypto;
+    #[wasm_bindgen(method, js_name = getRandomValues, catch)]
+    fn get_random_values(this: &BrowserCrypto, buf: &Uint8Array) -> Result<(), JsValue>;
+
+    // We use a "module" object here instead of just annotating require() with
+    // js_name = "module.require", so that Webpack doesn't give a warning. See:
+    //   https://github.com/rust-random/getrandom/issues/224
+    type NodeModule;
+    #[wasm_bindgen(js_name = module)]
+    static NODE_MODULE: NodeModule;
+    // Node JS crypto module (https://nodejs.org/api/crypto.html)
+    #[wasm_bindgen(method, catch)]
+    fn require(this: &NodeModule, s: &str) -> Result<NodeCrypto, JsValue>;
+    type NodeCrypto;
+    #[wasm_bindgen(method, js_name = randomFillSync, catch)]
+    fn random_fill_sync(this: &NodeCrypto, buf: &mut [u8]) -> Result<(), JsValue>;
+
+    // Node JS process Object (https://nodejs.org/api/process.html)
+    #[wasm_bindgen(method, getter)]
+    fn process(this: &Global) -> Process;
+    type Process;
+    #[wasm_bindgen(method, getter)]
+    fn versions(this: &Process) -> Versions;
+    type Versions;
+    #[wasm_bindgen(method, getter)]
+    fn node(this: &Versions) -> JsValue;
+}
diff --git a/vendor/getrandom/src/lib.rs b/vendor/getrandom/src/lib.rs
new file mode 100644
index 000000000..888b9a510
--- /dev/null
+++ b/vendor/getrandom/src/lib.rs
@@ -0,0 +1,263 @@
+// Copyright 2019 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Interface to the operating system's random number generator.
+//!
+//! # Supported targets
+//!
+//! | Target            | Target Triple      | Implementation
+//! | ----------------- | ------------------ | --------------
+//! | Linux, Android    | `*‑linux‑*`        | [`getrandom`][1] system call if available, otherwise [`/dev/urandom`][2] after successfully polling `/dev/random`
+//! | Windows           | `*‑windows‑*`      | [`BCryptGenRandom`]
+//! | macOS             | `*‑apple‑darwin`   | [`getentropy`][3] if available, otherwise [`/dev/random`][4] (identical to `/dev/urandom`)
+//! | iOS               | `*‑apple‑ios`      | [`SecRandomCopyBytes`]
+//! | FreeBSD           | `*‑freebsd`        | [`getrandom`][5] if available, otherwise [`kern.arandom`][6]
+//! | OpenBSD           | `*‑openbsd`        | [`getentropy`][7]
+//! | NetBSD            | `*‑netbsd`         | [`kern.arandom`][8]
+//! | Dragonfly BSD     | `*‑dragonfly`      | [`getrandom`][9] if available, otherwise [`/dev/random`][10]
+//! | Solaris, illumos  | `*‑solaris`, `*‑illumos` | [`getrandom`][11] if available, otherwise [`/dev/random`][12]
+//! | Fuchsia OS        | `*‑fuchsia`        | [`cprng_draw`]
+//! | Redox             | `*‑redox`          | `/dev/urandom`
+//! | Haiku             | `*‑haiku`          | `/dev/random` (identical to `/dev/urandom`)
+//! | Hermit            | `x86_64-*-hermit`  | [`RDRAND`]
+//! | SGX               | `x86_64‑*‑sgx`     | [`RDRAND`]
+//! | VxWorks           | `*‑wrs‑vxworks‑*`  | `randABytes` after checking entropy pool initialization with `randSecure`
+//! | ESP-IDF           | `*‑espidf`         | [`esp_fill_random`]
+//! | Emscripten        | `*‑emscripten`     | `/dev/random` (identical to `/dev/urandom`)
+//! | WASI              | `wasm32‑wasi`      | [`random_get`]
+//! | Web Browser       | `wasm32‑*‑unknown` | [`Crypto.getRandomValues`], see [WebAssembly support]
+//! | Node.js           | `wasm32‑*‑unknown` | [`crypto.randomBytes`], see [WebAssembly support]
+//! | SOLID             | `*-kmc-solid_*`    | `SOLID_RNG_SampleRandomBytes`
+//! | Nintendo 3DS      | `armv6k-nintendo-3ds` | [`getrandom`][1]
+//!
+//! There is no blanket implementation on `unix` targets that reads from
+//! `/dev/urandom`. This ensures all supported targets are using the recommended
+//! interface and respect maximum buffer sizes.
+//!
+//! Pull Requests that add support for new targets to `getrandom` are always welcome.
+//!
+//! ## Unsupported targets
+//!
+//! By default, `getrandom` will not compile on unsupported targets, but certain
+//! features allow a user to select a "fallback" implementation if no supported
+//! implementation exists.
+//!
+//! All of the below mechanisms only affect unsupported
+//! targets. Supported targets will _always_ use their supported implementations.
+//! This prevents a crate from overriding a secure source of randomness
+//! (either accidentally or intentionally).
+//!
+//! ### RDRAND on x86
+//!
+//! *If the `rdrand` Cargo feature is enabled*, `getrandom` will fallback to using
+//! the [`RDRAND`] instruction to get randomness on `no_std` `x86`/`x86_64`
+//! targets. This feature has no effect on other CPU architectures.
+//!
+//! ### WebAssembly support
+//!
+//! This crate fully supports the
+//! [`wasm32-wasi`](https://github.com/CraneStation/wasi) and
+//! [`wasm32-unknown-emscripten`](https://www.hellorust.com/setup/emscripten/)
+//! targets. However, the `wasm32-unknown-unknown` target (i.e. the target used
+//! by `wasm-pack`) is not automatically
+//! supported since, from the target name alone, we cannot deduce which
+//! JavaScript interface is in use (or if JavaScript is available at all).
+//!
+//! Instead, *if the `js` Cargo feature is enabled*, this crate will assume
+//! that you are building for an environment containing JavaScript, and will
+//! call the appropriate methods. Both web browser (main window and Web Workers)
+//! and Node.js environments are supported, invoking the methods
+//! [described above](#supported-targets) using the
+//! [wasm-bindgen](https://github.com/rust-lang/rust-bindgen) toolchain.
+//!
+//! This feature has no effect on targets other than `wasm32-unknown-unknown`.
+//!
+//! ### Custom implementations
+//!
+//! The [`register_custom_getrandom!`] macro allows a user to mark their own
+//! function as the backing implementation for [`getrandom`]. See the macro's
+//! documentation for more information about writing and registering your own
+//! custom implementations.
+//!
+//! Note that registering a custom implementation only has an effect on targets
+//! that would otherwise not compile. Any supported targets (including those
+//! using `rdrand` and `js` Cargo features) continue using their normal
+//! implementations even if a function is registered.
+//!
+//! ### Indirect Dependencies
+//!
+//! If `getrandom` is not a direct dependency of your crate, you can still
+//! enable any of the above fallback behaviors by enabling the relevant
+//! feature in your root crate's `Cargo.toml`:
+//! ```toml
+//! [dependencies]
+//! getrandom = { version = "0.2", features = ["js"] }
+//! ```
+//!
+//! ## Early boot
+//!
+//! Sometimes, early in the boot process, the OS has not collected enough
+//! entropy to securely seed its RNG. This is especially common on virtual
+//! machines, where standard "random" events are hard to come by.
+//!
+//! Some operating system interfaces always block until the RNG is securely
+//! seeded. This can take anywhere from a few seconds to more than a minute.
+//! A few (Linux, NetBSD and Solaris) offer a choice between blocking and
+//! getting an error; in these cases, we always choose to block.
+//!
+//! On Linux (when the `getrandom` system call is not available), reading from
+//! `/dev/urandom` never blocks, even when the OS hasn't collected enough
+//! entropy yet. To avoid returning low-entropy bytes, we first poll
+//! `/dev/random` and only switch to `/dev/urandom` once this has succeeded.
+//!
+//! ## Error handling
+//!
+//! We always choose failure over returning insecure "random" bytes. In general,
+//! on supported platforms, failure is highly unlikely, though not impossible.
+//! If an error does occur, then it is likely that it will occur on every call to
+//! `getrandom`, hence after the first successful call one can be reasonably
+//! confident that no errors will occur.
+//!
+//! [1]: http://man7.org/linux/man-pages/man2/getrandom.2.html
+//! [2]: http://man7.org/linux/man-pages/man4/urandom.4.html
+//! [3]: https://www.unix.com/man-page/mojave/2/getentropy/
+//! [4]: https://www.unix.com/man-page/mojave/4/random/
+//! [5]: https://www.freebsd.org/cgi/man.cgi?query=getrandom&manpath=FreeBSD+12.0-stable
+//! [6]: https://www.freebsd.org/cgi/man.cgi?query=random&sektion=4
+//! [7]: https://man.openbsd.org/getentropy.2
+//! [8]: https://man.netbsd.org/sysctl.7
+//! [9]: https://leaf.dragonflybsd.org/cgi/web-man?command=getrandom
+//! [10]: https://leaf.dragonflybsd.org/cgi/web-man?command=random&section=4
+//! [11]: https://docs.oracle.com/cd/E88353_01/html/E37841/getrandom-2.html
+//! [12]: https://docs.oracle.com/cd/E86824_01/html/E54777/random-7d.html
+//!
+//! [`BCryptGenRandom`]: https://docs.microsoft.com/en-us/windows/win32/api/bcrypt/nf-bcrypt-bcryptgenrandom
+//! [`Crypto.getRandomValues`]: https://www.w3.org/TR/WebCryptoAPI/#Crypto-method-getRandomValues
+//! [`RDRAND`]: https://software.intel.com/en-us/articles/intel-digital-random-number-generator-drng-software-implementation-guide
+//! [`SecRandomCopyBytes`]: https://developer.apple.com/documentation/security/1399291-secrandomcopybytes?language=objc
+//! [`cprng_draw`]: https://fuchsia.dev/fuchsia-src/zircon/syscalls/cprng_draw
+//! [`crypto.randomBytes`]: https://nodejs.org/api/crypto.html#crypto_crypto_randombytes_size_callback
+//! [`esp_fill_random`]: https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/system/random.html#_CPPv415esp_fill_randomPv6size_t
+//! [`random_get`]: https://github.com/WebAssembly/WASI/blob/main/phases/snapshot/docs.md#-random_getbuf-pointeru8-buf_len-size---errno
+//! [WebAssembly support]: #webassembly-support
+
+#![doc(
+    html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk.png",
+    html_favicon_url = "https://www.rust-lang.org/favicon.ico",
+    html_root_url = "https://docs.rs/getrandom/0.2.6"
+)]
+#![no_std]
+#![warn(rust_2018_idioms, unused_lifetimes, missing_docs)]
+#![cfg_attr(docsrs, feature(doc_cfg))]
+
+#[macro_use]
+extern crate cfg_if;
+
+mod error;
+mod util;
+// To prevent a breaking change when targets are added, we always export the
+// register_custom_getrandom macro, so old Custom RNG crates continue to build.
+#[cfg(feature = "custom")]
+mod custom;
+#[cfg(feature = "std")]
+mod error_impls;
+
+pub use crate::error::Error;
+
+// System-specific implementations.
+//
+// These should all provide getrandom_inner with the same signature as getrandom.
+cfg_if! {
+    if #[cfg(any(target_os = "emscripten", target_os = "haiku",
+                 target_os = "redox"))] {
+        mod util_libc;
+        #[path = "use_file.rs"] mod imp;
+    } else if #[cfg(any(target_os = "android", target_os = "linux"))] {
+        mod util_libc;
+        mod use_file;
+        #[path = "linux_android.rs"] mod imp;
+    } else if #[cfg(any(target_os = "illumos", target_os = "solaris"))] {
+        mod util_libc;
+        mod use_file;
+        #[path = "solaris_illumos.rs"] mod imp;
+    } else if #[cfg(any(target_os = "freebsd", target_os = "netbsd"))] {
+        mod util_libc;
+        #[path = "bsd_arandom.rs"] mod imp;
+    } else if #[cfg(target_os = "dragonfly")] {
+        mod util_libc;
+        mod use_file;
+        #[path = "dragonfly.rs"] mod imp;
+    } else if #[cfg(target_os = "fuchsia")] {
+        #[path = "fuchsia.rs"] mod imp;
+    } else if #[cfg(target_os = "ios")] {
+        #[path = "ios.rs"] mod imp;
+    } else if #[cfg(target_os = "macos")] {
+        mod util_libc;
+        mod use_file;
+        #[path = "macos.rs"] mod imp;
+    } else if #[cfg(target_os = "openbsd")] {
+        mod util_libc;
+        #[path = "openbsd.rs"] mod imp;
+    } else if #[cfg(target_os = "wasi")] {
+        #[path = "wasi.rs"] mod imp;
+    } else if #[cfg(all(target_arch = "x86_64", target_os = "hermit"))] {
+        #[path = "rdrand.rs"] mod imp;
+    } else if #[cfg(target_os = "vxworks")] {
+        mod util_libc;
+        #[path = "vxworks.rs"] mod imp;
+    } else if #[cfg(target_os = "solid_asp3")] {
+        #[path = "solid.rs"] mod imp;
+    } else if #[cfg(target_os = "espidf")] {
+        #[path = "espidf.rs"] mod imp;
+    } else if #[cfg(windows)] {
+        #[path = "windows.rs"] mod imp;
+    } else if #[cfg(all(target_arch = "x86_64", target_env = "sgx"))] {
+        #[path = "rdrand.rs"] mod imp;
+    } else if #[cfg(all(feature = "rdrand",
+                        any(target_arch = "x86_64", target_arch = "x86")))] {
+        #[path = "rdrand.rs"] mod imp;
+    } else if #[cfg(all(feature = "js",
+                        target_arch = "wasm32", target_os = "unknown"))] {
+        #[path = "js.rs"] mod imp;
+    } else if #[cfg(all(target_os = "horizon", target_arch = "arm"))] {
+        // We check for target_arch = "arm" because the Nintendo Switch also
+        // uses Horizon OS (it is aarch64).
+        mod util_libc;
+        #[path = "3ds.rs"] mod imp;
+    } else if #[cfg(feature = "custom")] {
+        use custom as imp;
+    } else if #[cfg(all(target_arch = "wasm32", target_os = "unknown"))] {
+        compile_error!("the wasm32-unknown-unknown target is not supported by \
+                        default, you may need to enable the \"js\" feature. \
+                        For more information see: \
+                        https://docs.rs/getrandom/#webassembly-support");
+    } else {
+        compile_error!("target is not supported, for more information see: \
+                        https://docs.rs/getrandom/#unsupported-targets");
+    }
+}
+
+/// Fill `dest` with random bytes from the system's preferred random number
+/// source.
+///
+/// This function returns an error on any failure, including partial reads. We
+/// make no guarantees regarding the contents of `dest` on error. If `dest` is
+/// empty, `getrandom` immediately returns success, making no calls to the
+/// underlying operating system.
+///
+/// Blocking is possible, at least during early boot; see module documentation.
+///
+/// In general, `getrandom` will be fast enough for interactive usage, though
+/// significantly slower than a user-space CSPRNG; for the latter consider
+/// [`rand::thread_rng`](https://docs.rs/rand/*/rand/fn.thread_rng.html).
+pub fn getrandom(dest: &mut [u8]) -> Result<(), Error> {
+    if dest.is_empty() {
+        return Ok(());
+    }
+    imp::getrandom_inner(dest)
+}
diff --git a/vendor/getrandom/src/linux_android.rs b/vendor/getrandom/src/linux_android.rs
new file mode 100644
index 000000000..5508fdd06
--- /dev/null
+++ b/vendor/getrandom/src/linux_android.rs
@@ -0,0 +1,46 @@
+// Copyright 2018 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Implementation for Linux / Android
+use crate::{
+    util::LazyBool,
+    util_libc::{last_os_error, sys_fill_exact},
+    {use_file, Error},
+};
+
+pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {
+    static HAS_GETRANDOM: LazyBool = LazyBool::new();
+    if HAS_GETRANDOM.unsync_init(is_getrandom_available) {
+        sys_fill_exact(dest, |buf| unsafe {
+            getrandom(buf.as_mut_ptr() as *mut libc::c_void, buf.len(), 0)
+        })
+    } else {
+        use_file::getrandom_inner(dest)
+    }
+}
+
+fn is_getrandom_available() -> bool {
+    let res = unsafe { getrandom(core::ptr::null_mut(), 0, libc::GRND_NONBLOCK) };
+    if res < 0 {
+        match last_os_error().raw_os_error() {
+            Some(libc::ENOSYS) => false, // No kernel support
+            Some(libc::EPERM) => false,  // Blocked by seccomp
+            _ => true,
+        }
+    } else {
+        true
+    }
+}
+
+unsafe fn getrandom(
+    buf: *mut libc::c_void,
+    buflen: libc::size_t,
+    flags: libc::c_uint,
+) -> libc::ssize_t {
+    libc::syscall(libc::SYS_getrandom, buf, buflen, flags) as libc::ssize_t
+}
diff --git a/vendor/getrandom/src/macos.rs b/vendor/getrandom/src/macos.rs
new file mode 100644
index 000000000..585a35abd
--- /dev/null
+++ b/vendor/getrandom/src/macos.rs
@@ -0,0 +1,35 @@
+// Copyright 2019 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Implementation for macOS
+use crate::{
+    use_file,
+    util_libc::{last_os_error, Weak},
+    Error,
+};
+use core::mem;
+
+type GetEntropyFn = unsafe extern "C" fn(*mut u8, libc::size_t) -> libc::c_int;
+
+pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {
+    static GETENTROPY: Weak = unsafe { Weak::new("getentropy\0") };
+    if let Some(fptr) = GETENTROPY.ptr() {
+        let func: GetEntropyFn = unsafe { mem::transmute(fptr) };
+        for chunk in dest.chunks_mut(256) {
+            let ret = unsafe { func(chunk.as_mut_ptr(), chunk.len()) };
+            if ret != 0 {
+                return Err(last_os_error());
+            }
+        }
+        Ok(())
+    } else {
+        // We fallback to reading from /dev/random instead of SecRandomCopyBytes
+        // to avoid high startup costs and linking the Security framework.
+        use_file::getrandom_inner(dest)
+    }
+}
diff --git a/vendor/getrandom/src/openbsd.rs b/vendor/getrandom/src/openbsd.rs
new file mode 100644
index 000000000..c8d28b3d8
--- /dev/null
+++ b/vendor/getrandom/src/openbsd.rs
@@ -0,0 +1,20 @@
+// Copyright 2018 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Implementation for OpenBSD
+use crate::{util_libc::last_os_error, Error};
+
+pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {
+    for chunk in dest.chunks_mut(256) {
+        let ret = unsafe { libc::getentropy(chunk.as_mut_ptr() as *mut libc::c_void, chunk.len()) };
+        if ret == -1 {
+            return Err(last_os_error());
+        }
+    }
+    Ok(())
+}
diff --git a/vendor/getrandom/src/rdrand.rs b/vendor/getrandom/src/rdrand.rs
new file mode 100644
index 000000000..1df21e5d9
--- /dev/null
+++ b/vendor/getrandom/src/rdrand.rs
@@ -0,0 +1,97 @@
+// Copyright 2018 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Implementation for SGX using RDRAND instruction
+use crate::Error;
+use core::mem;
+
+cfg_if! {
+    if #[cfg(target_arch = "x86_64")] {
+        use core::arch::x86_64 as arch;
+        use arch::_rdrand64_step as rdrand_step;
+    } else if #[cfg(target_arch = "x86")] {
+        use core::arch::x86 as arch;
+        use arch::_rdrand32_step as rdrand_step;
+    }
+}
+
+// Recommendation from "Intel® Digital Random Number Generator (DRNG) Software
+// Implementation Guide" - Section 5.2.1 and "Intel® 64 and IA-32 Architectures
+// Software Developer’s Manual" - Volume 1 - Section 7.3.17.1.
+const RETRY_LIMIT: usize = 10;
+const WORD_SIZE: usize = mem::size_of::<usize>();
+
+#[target_feature(enable = "rdrand")]
+unsafe fn rdrand() -> Result<[u8; WORD_SIZE], Error> {
+    for _ in 0..RETRY_LIMIT {
+        let mut el = mem::zeroed();
+        if rdrand_step(&mut el) == 1 {
+            // AMD CPUs from families 14h to 16h (pre Ryzen) sometimes fail to
+            // set CF on bogus random data, so we check these values explicitly.
+            // See https://github.com/systemd/systemd/issues/11810#issuecomment-489727505
+            // We perform this check regardless of target to guard against
+            // any implementation that incorrectly fails to set CF.
+            if el != 0 && el != !0 {
+                return Ok(el.to_ne_bytes());
+            }
+            // Keep looping in case this was a false positive.
+        }
+    }
+    Err(Error::FAILED_RDRAND)
+}
+
+// "rdrand" target feature requires "+rdrnd" flag, see https://github.com/rust-lang/rust/issues/49653.
+#[cfg(all(target_env = "sgx", not(target_feature = "rdrand")))]
+compile_error!(
+    "SGX targets require 'rdrand' target feature. Enable by using -C target-feature=+rdrnd."
+);
+
+#[cfg(target_feature = "rdrand")]
+fn is_rdrand_supported() -> bool {
+    true
+}
+
+// TODO use is_x86_feature_detected!("rdrand") when that works in core. See:
+// https://github.com/rust-lang-nursery/stdsimd/issues/464
+#[cfg(not(target_feature = "rdrand"))]
+fn is_rdrand_supported() -> bool {
+    use crate::util::LazyBool;
+
+    // SAFETY: All Rust x86 targets are new enough to have CPUID, and if CPUID
+    // is supported, CPUID leaf 1 is always supported.
+    const FLAG: u32 = 1 << 30;
+    static HAS_RDRAND: LazyBool = LazyBool::new();
+    HAS_RDRAND.unsync_init(|| unsafe { (arch::__cpuid(1).ecx & FLAG) != 0 })
+}
+
+pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {
+    if !is_rdrand_supported() {
+        return Err(Error::NO_RDRAND);
+    }
+
+    // SAFETY: After this point, rdrand is supported, so calling the rdrand
+    // functions is not undefined behavior.
+    unsafe { rdrand_exact(dest) }
+}
+
+#[target_feature(enable = "rdrand")]
+unsafe fn rdrand_exact(dest: &mut [u8]) -> Result<(), Error> {
+    // We use chunks_exact_mut instead of chunks_mut as it allows almost all
+    // calls to memcpy to be elided by the compiler.
+    let mut chunks = dest.chunks_exact_mut(WORD_SIZE);
+    for chunk in chunks.by_ref() {
+        chunk.copy_from_slice(&rdrand()?);
+    }
+
+    let tail = chunks.into_remainder();
+    let n = tail.len();
+    if n > 0 {
+        tail.copy_from_slice(&rdrand()?[..n]);
+    }
+    Ok(())
+}
diff --git a/vendor/getrandom/src/solaris_illumos.rs b/vendor/getrandom/src/solaris_illumos.rs
new file mode 100644
index 000000000..2d1b767bb
--- /dev/null
+++ b/vendor/getrandom/src/solaris_illumos.rs
@@ -0,0 +1,47 @@
+// Copyright 2018 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Implementation for the Solaris family
+//!
+//! Read from `/dev/random`, with chunks of limited size (256 bytes).
+//! `/dev/random` uses the Hash_DRBG with SHA512 algorithm from NIST SP 800-90A.
+//! `/dev/urandom` uses the FIPS 186-2 algorithm, which is considered less
+//! secure. We choose to read from `/dev/random`.
+//!
+//! Since Solaris 11.3 and mid-2015 illumos, the `getrandom` syscall is available.
+//! To make sure we can compile on both Solaris and its derivatives, as well as
+//! function, we check for the existence of getrandom(2) in libc by calling
+//! libc::dlsym.
+use crate::{
+    use_file,
+    util_libc::{sys_fill_exact, Weak},
+    Error,
+};
+use core::mem;
+
+#[cfg(target_os = "illumos")]
+type GetRandomFn = unsafe extern "C" fn(*mut u8, libc::size_t, libc::c_uint) -> libc::ssize_t;
+#[cfg(target_os = "solaris")]
+type GetRandomFn = unsafe extern "C" fn(*mut u8, libc::size_t, libc::c_uint) -> libc::c_int;
+
+pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {
+    static GETRANDOM: Weak = unsafe { Weak::new("getrandom\0") };
+    if let Some(fptr) = GETRANDOM.ptr() {
+        let func: GetRandomFn = unsafe { mem::transmute(fptr) };
+        // 256 bytes is the lowest common denominator across all the Solaris
+        // derived platforms for atomically obtaining random data.
+        for chunk in dest.chunks_mut(256) {
+            sys_fill_exact(chunk, |buf| unsafe {
+                func(buf.as_mut_ptr(), buf.len(), 0) as libc::ssize_t
+            })?
+        }
+        Ok(())
+    } else {
+        use_file::getrandom_inner(dest)
+    }
+}
diff --git a/vendor/getrandom/src/solid.rs b/vendor/getrandom/src/solid.rs
new file mode 100644
index 000000000..dc76aacbf
--- /dev/null
+++ b/vendor/getrandom/src/solid.rs
@@ -0,0 +1,26 @@
+// Copyright 2021 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Implementation for SOLID
+use crate::Error;
+use core::num::NonZeroU32;
+
+extern "C" {
+    pub fn SOLID_RNG_SampleRandomBytes(buffer: *mut u8, length: usize) -> i32;
+}
+
+pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {
+    let ret = unsafe { SOLID_RNG_SampleRandomBytes(dest.as_mut_ptr(), dest.len()) };
+    if ret >= 0 {
+        Ok(())
+    } else {
+        // ITRON error numbers are always negative, so we negate it so that it
+        // falls in the dedicated OS error range (1..INTERNAL_START).
+        Err(NonZeroU32::new((-ret) as u32).unwrap().into())
+    }
+}
diff --git a/vendor/getrandom/src/use_file.rs b/vendor/getrandom/src/use_file.rs
new file mode 100644
index 000000000..16c0216b6
--- /dev/null
+++ b/vendor/getrandom/src/use_file.rs
@@ -0,0 +1,139 @@
+// Copyright 2018 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Implementations that just need to read from a file
+use crate::{
+    util::LazyUsize,
+    util_libc::{open_readonly, sys_fill_exact},
+    Error,
+};
+use core::{
+    cell::UnsafeCell,
+    sync::atomic::{AtomicUsize, Ordering::Relaxed},
+};
+
+#[cfg(any(
+    target_os = "dragonfly",
+    target_os = "emscripten",
+    target_os = "haiku",
+    target_os = "macos",
+    target_os = "solaris",
+    target_os = "illumos"
+))]
+const FILE_PATH: &str = "/dev/random\0";
+#[cfg(any(target_os = "android", target_os = "linux", target_os = "redox"))]
+const FILE_PATH: &str = "/dev/urandom\0";
+
+pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {
+    let fd = get_rng_fd()?;
+    let read = |buf: &mut [u8]| unsafe { libc::read(fd, buf.as_mut_ptr() as *mut _, buf.len()) };
+
+    if cfg!(target_os = "emscripten") {
+        // `Crypto.getRandomValues` documents `dest` should be at most 65536 bytes.
+        for chunk in dest.chunks_mut(65536) {
+            sys_fill_exact(chunk, read)?;
+        }
+    } else {
+        sys_fill_exact(dest, read)?;
+    }
+    Ok(())
+}
+
+// Returns the file descriptor for the device file used to retrieve random
+// bytes. The file will be opened exactly once. All subsequent calls will
+// return the same file descriptor. This file descriptor is never closed.
+fn get_rng_fd() -> Result<libc::c_int, Error> {
+    static FD: AtomicUsize = AtomicUsize::new(LazyUsize::UNINIT);
+    fn get_fd() -> Option<libc::c_int> {
+        match FD.load(Relaxed) {
+            LazyUsize::UNINIT => None,
+            val => Some(val as libc::c_int),
+        }
+    }
+
+    // Use double-checked locking to avoid acquiring the lock if possible.
+    if let Some(fd) = get_fd() {
+        return Ok(fd);
+    }
+
+    // SAFETY: We use the mutex only in this method, and we always unlock it
+    // before returning, making sure we don't violate the pthread_mutex_t API.
+    static MUTEX: Mutex = Mutex::new();
+    unsafe { MUTEX.lock() };
+    let _guard = DropGuard(|| unsafe { MUTEX.unlock() });
+
+    if let Some(fd) = get_fd() {
+        return Ok(fd);
+    }
+
+    // On Linux, /dev/urandom might return insecure values.
+    #[cfg(any(target_os = "android", target_os = "linux"))]
+    wait_until_rng_ready()?;
+
+    let fd = unsafe { open_readonly(FILE_PATH)? };
+    // The fd always fits in a usize without conflicting with UNINIT.
+    debug_assert!(fd >= 0 && (fd as usize) < LazyUsize::UNINIT);
+    FD.store(fd as usize, Relaxed);
+
+    Ok(fd)
+}
+
+// Succeeds once /dev/urandom is safe to read from
+#[cfg(any(target_os = "android", target_os = "linux"))]
+fn wait_until_rng_ready() -> Result<(), Error> {
+    // Poll /dev/random to make sure it is ok to read from /dev/urandom.
+    let fd = unsafe { open_readonly("/dev/random\0")? };
+    let mut pfd = libc::pollfd {
+        fd,
+        events: libc::POLLIN,
+        revents: 0,
+    };
+    let _guard = DropGuard(|| unsafe {
+        libc::close(fd);
+    });
+
+    loop {
+        // A negative timeout means an infinite timeout.
+        let res = unsafe { libc::poll(&mut pfd, 1, -1) };
+        if res >= 0 {
+            debug_assert_eq!(res, 1); // We only used one fd, and cannot timeout.
+            return Ok(());
+        }
+        let err = crate::util_libc::last_os_error();
+        match err.raw_os_error() {
+            Some(libc::EINTR) | Some(libc::EAGAIN) => continue,
+            _ => return Err(err),
+        }
+    }
+}
+
+struct Mutex(UnsafeCell<libc::pthread_mutex_t>);
+
+impl Mutex {
+    const fn new() -> Self {
+        Self(UnsafeCell::new(libc::PTHREAD_MUTEX_INITIALIZER))
+    }
+    unsafe fn lock(&self) {
+        let r = libc::pthread_mutex_lock(self.0.get());
+        debug_assert_eq!(r, 0);
+    }
+    unsafe fn unlock(&self) {
+        let r = libc::pthread_mutex_unlock(self.0.get());
+        debug_assert_eq!(r, 0);
+    }
+}
+
+unsafe impl Sync for Mutex {}
+
+struct DropGuard<F: FnMut()>(F);
+
+impl<F: FnMut()> Drop for DropGuard<F> {
+    fn drop(&mut self) {
+        self.0()
+    }
+}
diff --git a/vendor/getrandom/src/util.rs b/vendor/getrandom/src/util.rs
new file mode 100644
index 000000000..06e23c28c
--- /dev/null
+++ b/vendor/getrandom/src/util.rs
@@ -0,0 +1,64 @@
+// Copyright 2019 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+#![allow(dead_code)]
+use core::sync::atomic::{AtomicUsize, Ordering::Relaxed};
+
+// This structure represents a lazily initialized static usize value. Useful
+// when it is preferable to just rerun initialization instead of locking.
+// Both unsync_init and sync_init will invoke an init() function until it
+// succeeds, then return the cached value for future calls.
+//
+// Both methods support init() "failing". If the init() method returns UNINIT,
+// that value will be returned as normal, but will not be cached.
+//
+// Users should only depend on the _value_ returned by init() functions.
+// Specifically, for the following init() function:
+//      fn init() -> usize {
+//          a();
+//          let v = b();
+//          c();
+//          v
+//      }
+// the effects of c() or writes to shared memory will not necessarily be
+// observed and additional synchronization methods with be needed.
+pub struct LazyUsize(AtomicUsize);
+
+impl LazyUsize {
+    pub const fn new() -> Self {
+        Self(AtomicUsize::new(Self::UNINIT))
+    }
+
+    // The initialization is not completed.
+    pub const UNINIT: usize = usize::max_value();
+
+    // Runs the init() function at least once, returning the value of some run
+    // of init(). Multiple callers can run their init() functions in parallel.
+    // init() should always return the same value, if it succeeds.
+    pub fn unsync_init(&self, init: impl FnOnce() -> usize) -> usize {
+        // Relaxed ordering is fine, as we only have a single atomic variable.
+        let mut val = self.0.load(Relaxed);
+        if val == Self::UNINIT {
+            val = init();
+            self.0.store(val, Relaxed);
+        }
+        val
+    }
+}
+
+// Identical to LazyUsize except with bool instead of usize.
+pub struct LazyBool(LazyUsize);
+
+impl LazyBool {
+    pub const fn new() -> Self {
+        Self(LazyUsize::new())
+    }
+
+    pub fn unsync_init(&self, init: impl FnOnce() -> bool) -> bool {
+        self.0.unsync_init(|| init() as usize) != 0
+    }
+}
diff --git a/vendor/getrandom/src/util_libc.rs b/vendor/getrandom/src/util_libc.rs
new file mode 100644
index 000000000..6df1cd7da
--- /dev/null
+++ b/vendor/getrandom/src/util_libc.rs
@@ -0,0 +1,127 @@
+// Copyright 2019 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+#![allow(dead_code)]
+use crate::{util::LazyUsize, Error};
+use core::{num::NonZeroU32, ptr::NonNull};
+
+cfg_if! {
+    if #[cfg(any(target_os = "netbsd", target_os = "openbsd", target_os = "android"))] {
+        use libc::__errno as errno_location;
+    } else if #[cfg(any(target_os = "linux", target_os = "emscripten", target_os = "redox"))] {
+        use libc::__errno_location as errno_location;
+    } else if #[cfg(any(target_os = "solaris", target_os = "illumos"))] {
+        use libc::___errno as errno_location;
+    } else if #[cfg(any(target_os = "macos", target_os = "freebsd"))] {
+        use libc::__error as errno_location;
+    } else if #[cfg(target_os = "haiku")] {
+        use libc::_errnop as errno_location;
+    } else if #[cfg(all(target_os = "horizon", target_arch = "arm"))] {
+        extern "C" {
+            // Not provided by libc: https://github.com/rust-lang/libc/issues/1995
+            fn __errno() -> *mut libc::c_int;
+        }
+        use __errno as errno_location;
+    }
+}
+
+cfg_if! {
+    if #[cfg(target_os = "vxworks")] {
+        use libc::errnoGet as get_errno;
+    } else if #[cfg(target_os = "dragonfly")] {
+        // Until rust-lang/rust#29594 is stable, we cannot get the errno value
+        // on DragonFlyBSD. So we just return an out-of-range errno.
+        unsafe fn get_errno() -> libc::c_int { -1 }
+    } else {
+        unsafe fn get_errno() -> libc::c_int { *errno_location() }
+    }
+}
+
+pub fn last_os_error() -> Error {
+    let errno = unsafe { get_errno() };
+    if errno > 0 {
+        Error::from(NonZeroU32::new(errno as u32).unwrap())
+    } else {
+        Error::ERRNO_NOT_POSITIVE
+    }
+}
+
+// Fill a buffer by repeatedly invoking a system call. The `sys_fill` function:
+//   - should return -1 and set errno on failure
+//   - should return the number of bytes written on success
+pub fn sys_fill_exact(
+    mut buf: &mut [u8],
+    sys_fill: impl Fn(&mut [u8]) -> libc::ssize_t,
+) -> Result<(), Error> {
+    while !buf.is_empty() {
+        let res = sys_fill(buf);
+        if res < 0 {
+            let err = last_os_error();
+            // We should try again if the call was interrupted.
+            if err.raw_os_error() != Some(libc::EINTR) {
+                return Err(err);
+            }
+        } else {
+            // We don't check for EOF (ret = 0) as the data we are reading
+            // should be an infinite stream of random bytes.
+            buf = &mut buf[(res as usize)..];
+        }
+    }
+    Ok(())
+}
+
+// A "weak" binding to a C function that may or may not be present at runtime.
+// Used for supporting newer OS features while still building on older systems.
+// F must be a function pointer of type `unsafe extern "C" fn`. Based off of the
+// weak! macro in libstd.
+pub struct Weak {
+    name: &'static str,
+    addr: LazyUsize,
+}
+
+impl Weak {
+    // Construct a binding to a C function with a given name. This function is
+    // unsafe because `name` _must_ be null terminated.
+    pub const unsafe fn new(name: &'static str) -> Self {
+        Self {
+            name,
+            addr: LazyUsize::new(),
+        }
+    }
+
+    // Return a function pointer if present at runtime. Otherwise, return null.
+    pub fn ptr(&self) -> Option<NonNull<libc::c_void>> {
+        let addr = self.addr.unsync_init(|| unsafe {
+            libc::dlsym(libc::RTLD_DEFAULT, self.name.as_ptr() as *const _) as usize
+        });
+        NonNull::new(addr as *mut _)
+    }
+}
+
+cfg_if! {
+    if #[cfg(any(target_os = "linux", target_os = "emscripten"))] {
+        use libc::open64 as open;
+    } else {
+        use libc::open;
+    }
+}
+
+// SAFETY: path must be null terminated, FD must be manually closed.
+pub unsafe fn open_readonly(path: &str) -> Result<libc::c_int, Error> {
+    debug_assert_eq!(path.as_bytes().last(), Some(&0));
+    loop {
+        let fd = open(path.as_ptr() as *const _, libc::O_RDONLY | libc::O_CLOEXEC);
+        if fd >= 0 {
+            return Ok(fd);
+        }
+        let err = last_os_error();
+        // We should try again if open() was interrupted.
+        if err.raw_os_error() != Some(libc::EINTR) {
+            return Err(err);
+        }
+    }
+}
diff --git a/vendor/getrandom/src/vxworks.rs b/vendor/getrandom/src/vxworks.rs
new file mode 100644
index 000000000..6cb5d52fe
--- /dev/null
+++ b/vendor/getrandom/src/vxworks.rs
@@ -0,0 +1,34 @@
+// Copyright 2018 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Implementation for VxWorks
+use crate::{util_libc::last_os_error, Error};
+use core::sync::atomic::{AtomicBool, Ordering::Relaxed};
+
+pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {
+    static RNG_INIT: AtomicBool = AtomicBool::new(false);
+    while !RNG_INIT.load(Relaxed) {
+        let ret = unsafe { libc::randSecure() };
+        if ret < 0 {
+            return Err(Error::VXWORKS_RAND_SECURE);
+        } else if ret > 0 {
+            RNG_INIT.store(true, Relaxed);
+            break;
+        }
+        unsafe { libc::usleep(10) };
+    }
+
+    // Prevent overflow of i32
+    for chunk in dest.chunks_mut(i32::max_value() as usize) {
+        let ret = unsafe { libc::randABytes(chunk.as_mut_ptr(), chunk.len() as i32) };
+        if ret != 0 {
+            return Err(last_os_error());
+        }
+    }
+    Ok(())
+}
diff --git a/vendor/getrandom/src/wasi.rs b/vendor/getrandom/src/wasi.rs
new file mode 100644
index 000000000..2d413e020
--- /dev/null
+++ b/vendor/getrandom/src/wasi.rs
@@ -0,0 +1,23 @@
+// Copyright 2018 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Implementation for WASI
+use crate::Error;
+use core::num::NonZeroU32;
+use wasi::random_get;
+
+pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {
+    unsafe {
+        random_get(dest.as_mut_ptr(), dest.len()).map_err(|e: wasi::Error| {
+            // convert wasi's Error into getrandom's NonZeroU32 error
+            // SAFETY: `wasi::Error` is `NonZeroU16` internally, so `e.raw_error()`
+            // will never return 0
+            NonZeroU32::new_unchecked(e.raw_error() as u32).into()
+        })
+    }
+}
diff --git a/vendor/getrandom/src/windows.rs b/vendor/getrandom/src/windows.rs
new file mode 100644
index 000000000..643badd07
--- /dev/null
+++ b/vendor/getrandom/src/windows.rs
@@ -0,0 +1,48 @@
+// Copyright 2018 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use crate::Error;
+use core::{ffi::c_void, num::NonZeroU32, ptr};
+
+const BCRYPT_USE_SYSTEM_PREFERRED_RNG: u32 = 0x00000002;
+
+#[link(name = "bcrypt")]
+extern "system" {
+    fn BCryptGenRandom(
+        hAlgorithm: *mut c_void,
+        pBuffer: *mut u8,
+        cbBuffer: u32,
+        dwFlags: u32,
+    ) -> u32;
+}
+
+pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {
+    // Prevent overflow of u32
+    for chunk in dest.chunks_mut(u32::max_value() as usize) {
+        let ret = unsafe {
+            BCryptGenRandom(
+                ptr::null_mut(),
+                chunk.as_mut_ptr(),
+                chunk.len() as u32,
+                BCRYPT_USE_SYSTEM_PREFERRED_RNG,
+            )
+        };
+        // NTSTATUS codes use the two highest bits for severity status.
+        if ret >> 30 == 0b11 {
+            // We zeroize the highest bit, so the error code will reside
+            // inside the range designated for OS codes.
+            let code = ret ^ (1 << 31);
+            // SAFETY: the second highest bit is always equal to one,
+            // so it's impossible to get zero. Unfortunately the type
+            // system does not have a way to express this yet.
+            let code = unsafe { NonZeroU32::new_unchecked(code) };
+            return Err(Error::from(code));
+        }
+    }
+    Ok(())
+}