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|
//! The message digest context.
//!
//! # Examples
//!
//! Compute the SHA256 checksum of data
//!
//! ```
//! use openssl::md::Md;
//! use openssl::md_ctx::MdCtx;
//!
//! let mut ctx = MdCtx::new().unwrap();
//! ctx.digest_init(Md::sha256()).unwrap();
//! ctx.digest_update(b"Some Crypto Text").unwrap();
//! let mut digest = [0; 32];
//! ctx.digest_final(&mut digest).unwrap();
//!
//! assert_eq!(
//! digest,
//! *b"\x60\x78\x56\x38\x8a\xca\x5c\x51\x83\xc4\xd1\x4d\xc8\xf9\xcc\xf2\
//! \xa5\x21\xb3\x10\x93\x72\xfa\xd6\x7c\x55\xf5\xc9\xe3\xd1\x83\x19",
//! );
//! ```
//!
//! Sign and verify data with RSA and SHA256
//!
//! ```
//! use openssl::md::Md;
//! use openssl::md_ctx::MdCtx;
//! use openssl::pkey::PKey;
//! use openssl::rsa::Rsa;
//!
//! // Generate a random RSA key.
//! let key = Rsa::generate(4096).unwrap();
//! let key = PKey::from_rsa(key).unwrap();
//!
//! let text = b"Some Crypto Text";
//!
//! // Create the signature.
//! let mut ctx = MdCtx::new().unwrap();
//! ctx.digest_sign_init(Some(Md::sha256()), &key).unwrap();
//! ctx.digest_sign_update(text).unwrap();
//! let mut signature = vec![];
//! ctx.digest_sign_final_to_vec(&mut signature).unwrap();
//!
//! // Verify the signature.
//! let mut ctx = MdCtx::new().unwrap();
//! ctx.digest_verify_init(Some(Md::sha256()), &key).unwrap();
//! ctx.digest_verify_update(text).unwrap();
//! let valid = ctx.digest_verify_final(&signature).unwrap();
//! assert!(valid);
//! ```
//!
#![cfg_attr(
not(boringssl),
doc = r#"\
Compute and verify an HMAC-SHA256
```
use openssl::md::Md;
use openssl::md_ctx::MdCtx;
use openssl::memcmp;
use openssl::pkey::PKey;
// Create a key with the HMAC secret.
let key = PKey::hmac(b"my secret").unwrap();
let text = b"Some Crypto Text";
// Compute the HMAC.
let mut ctx = MdCtx::new().unwrap();
ctx.digest_sign_init(Some(Md::sha256()), &key).unwrap();
ctx.digest_sign_update(text).unwrap();
let mut hmac = vec![];
ctx.digest_sign_final_to_vec(&mut hmac).unwrap();
// Verify the HMAC. You can't use MdCtx to do this; instead use a constant time equality check.
# let target = hmac.clone();
let valid = memcmp::eq(&hmac, &target);
assert!(valid);
```"#
)]
use crate::error::ErrorStack;
use crate::md::MdRef;
use crate::pkey::{HasPrivate, HasPublic, PKeyRef};
use crate::pkey_ctx::PkeyCtxRef;
use crate::{cvt, cvt_n, cvt_p};
use cfg_if::cfg_if;
use foreign_types::{ForeignType, ForeignTypeRef};
use openssl_macros::corresponds;
use std::convert::TryFrom;
use std::ptr;
cfg_if! {
if #[cfg(ossl110)] {
use ffi::{EVP_MD_CTX_free, EVP_MD_CTX_new};
} else {
use ffi::{EVP_MD_CTX_create as EVP_MD_CTX_new, EVP_MD_CTX_destroy as EVP_MD_CTX_free};
}
}
foreign_type_and_impl_send_sync! {
type CType = ffi::EVP_MD_CTX;
fn drop = EVP_MD_CTX_free;
pub struct MdCtx;
/// A reference to an [`MdCtx`].
pub struct MdCtxRef;
}
impl MdCtx {
/// Creates a new context.
#[corresponds(EVP_MD_CTX_new)]
#[inline]
pub fn new() -> Result<Self, ErrorStack> {
ffi::init();
unsafe {
let ptr = cvt_p(EVP_MD_CTX_new())?;
Ok(MdCtx::from_ptr(ptr))
}
}
}
impl MdCtxRef {
/// Initializes the context to compute the digest of data.
#[corresponds(EVP_DigestInit_ex)]
#[inline]
pub fn digest_init(&mut self, digest: &MdRef) -> Result<(), ErrorStack> {
unsafe {
cvt(ffi::EVP_DigestInit_ex(
self.as_ptr(),
digest.as_ptr(),
ptr::null_mut(),
))?;
}
Ok(())
}
/// Initializes the context to compute the signature of data.
///
/// A reference to the context's inner `PkeyCtx` is returned, allowing signature settings to be configured.
#[corresponds(EVP_DigestSignInit)]
#[inline]
pub fn digest_sign_init<'a, T>(
&'a mut self,
digest: Option<&MdRef>,
pkey: &PKeyRef<T>,
) -> Result<&'a mut PkeyCtxRef<T>, ErrorStack>
where
T: HasPrivate,
{
unsafe {
let mut p = ptr::null_mut();
cvt(ffi::EVP_DigestSignInit(
self.as_ptr(),
&mut p,
digest.map_or(ptr::null(), |p| p.as_ptr()),
ptr::null_mut(),
pkey.as_ptr(),
))?;
Ok(PkeyCtxRef::from_ptr_mut(p))
}
}
/// Initializes the context to verify the signature of data.
///
/// A reference to the context's inner `PkeyCtx` is returned, allowing signature settings to be configured.
#[corresponds(EVP_DigestVerifyInit)]
#[inline]
pub fn digest_verify_init<'a, T>(
&'a mut self,
digest: Option<&MdRef>,
pkey: &PKeyRef<T>,
) -> Result<&'a mut PkeyCtxRef<T>, ErrorStack>
where
T: HasPublic,
{
unsafe {
let mut p = ptr::null_mut();
cvt(ffi::EVP_DigestVerifyInit(
self.as_ptr(),
&mut p,
digest.map_or(ptr::null(), |p| p.as_ptr()),
ptr::null_mut(),
pkey.as_ptr(),
))?;
Ok(PkeyCtxRef::from_ptr_mut(p))
}
}
/// Updates the context with more data.
#[corresponds(EVP_DigestUpdate)]
#[inline]
pub fn digest_update(&mut self, data: &[u8]) -> Result<(), ErrorStack> {
unsafe {
cvt(ffi::EVP_DigestUpdate(
self.as_ptr(),
data.as_ptr() as *const _,
data.len(),
))?;
}
Ok(())
}
/// Updates the context with more data.
#[corresponds(EVP_DigestSignUpdate)]
#[inline]
pub fn digest_sign_update(&mut self, data: &[u8]) -> Result<(), ErrorStack> {
unsafe {
cvt(ffi::EVP_DigestSignUpdate(
self.as_ptr(),
data.as_ptr() as *const _,
data.len(),
))?;
}
Ok(())
}
/// Updates the context with more data.
#[corresponds(EVP_DigestVerifyUpdate)]
#[inline]
pub fn digest_verify_update(&mut self, data: &[u8]) -> Result<(), ErrorStack> {
unsafe {
cvt(ffi::EVP_DigestVerifyUpdate(
self.as_ptr(),
data.as_ptr() as *const _,
data.len(),
))?;
}
Ok(())
}
/// Copies the computed digest into the buffer, returning the number of bytes written.
#[corresponds(EVP_DigestFinal)]
#[inline]
pub fn digest_final(&mut self, out: &mut [u8]) -> Result<usize, ErrorStack> {
let mut len = u32::try_from(out.len()).unwrap_or(u32::MAX);
unsafe {
cvt(ffi::EVP_DigestFinal(
self.as_ptr(),
out.as_mut_ptr(),
&mut len,
))?;
}
Ok(len as usize)
}
/// Copies the computed digest into the buffer.
///
/// Requires OpenSSL 1.1.1 or newer.
#[corresponds(EVP_DigestFinalXOF)]
#[inline]
#[cfg(ossl111)]
pub fn digest_final_xof(&mut self, out: &mut [u8]) -> Result<(), ErrorStack> {
unsafe {
cvt(ffi::EVP_DigestFinalXOF(
self.as_ptr(),
out.as_mut_ptr(),
out.len(),
))?;
}
Ok(())
}
/// Signs the computed digest.
///
/// If `out` is set to `None`, an upper bound on the number of bytes required for the output buffer will be
/// returned.
#[corresponds(EVP_DigestSignFinal)]
#[inline]
pub fn digest_sign_final(&mut self, out: Option<&mut [u8]>) -> Result<usize, ErrorStack> {
let mut len = out.as_ref().map_or(0, |b| b.len());
unsafe {
cvt(ffi::EVP_DigestSignFinal(
self.as_ptr(),
out.map_or(ptr::null_mut(), |b| b.as_mut_ptr()),
&mut len,
))?;
}
Ok(len)
}
/// Like [`Self::digest_sign_final`] but appends the signature to a [`Vec`].
pub fn digest_sign_final_to_vec(&mut self, out: &mut Vec<u8>) -> Result<usize, ErrorStack> {
let base = out.len();
let len = self.digest_sign_final(None)?;
out.resize(base + len, 0);
let len = self.digest_sign_final(Some(&mut out[base..]))?;
out.truncate(base + len);
Ok(len)
}
/// Verifies the provided signature.
///
/// Returns `Ok(true)` if the signature is valid, `Ok(false)` if the signature is invalid, and `Err` if an error
/// occurred.
#[corresponds(EVP_DigestVerifyFinal)]
#[inline]
pub fn digest_verify_final(&mut self, signature: &[u8]) -> Result<bool, ErrorStack> {
unsafe {
let r = cvt_n(ffi::EVP_DigestVerifyFinal(
self.as_ptr(),
signature.as_ptr() as *mut _,
signature.len(),
))?;
Ok(r == 1)
}
}
/// Computes the signature of the data in `from`.
///
/// If `to` is set to `None`, an upper bound on the number of bytes required for the output buffer will be
/// returned.
///
/// Requires OpenSSL 1.1.1 or newer.
#[corresponds(EVP_DigestSign)]
#[cfg(ossl111)]
#[inline]
pub fn digest_sign(&mut self, from: &[u8], to: Option<&mut [u8]>) -> Result<usize, ErrorStack> {
let mut len = to.as_ref().map_or(0, |b| b.len());
unsafe {
cvt(ffi::EVP_DigestSign(
self.as_ptr(),
to.map_or(ptr::null_mut(), |b| b.as_mut_ptr()),
&mut len,
from.as_ptr(),
from.len(),
))?;
}
Ok(len)
}
/// Like [`Self::digest_sign`] but appends the signature to a [`Vec`].
#[cfg(ossl111)]
pub fn digest_sign_to_vec(
&mut self,
from: &[u8],
to: &mut Vec<u8>,
) -> Result<usize, ErrorStack> {
let base = to.len();
let len = self.digest_sign(from, None)?;
to.resize(base + len, 0);
let len = self.digest_sign(from, Some(&mut to[base..]))?;
to.truncate(base + len);
Ok(len)
}
/// Verifies the signature of the data in `data`.
///
/// Returns `Ok(true)` if the signature is valid, `Ok(false)` if the signature is invalid, and `Err` if an error
/// occurred.
///
/// Requires OpenSSL 1.1.1 or newer.
#[corresponds(EVP_DigestVerify)]
#[cfg(ossl111)]
#[inline]
pub fn digest_verify(&mut self, data: &[u8], signature: &[u8]) -> Result<bool, ErrorStack> {
unsafe {
let r = cvt(ffi::EVP_DigestVerify(
self.as_ptr(),
signature.as_ptr(),
signature.len(),
data.as_ptr(),
data.len(),
))?;
Ok(r == 1)
}
}
/// Returns the size of the message digest, i.e. the size of the hash
#[corresponds(EVP_MD_CTX_size)]
#[inline]
pub fn size(&self) -> usize {
unsafe { ffi::EVP_MD_CTX_size(self.as_ptr()) as usize }
}
/// Resets the underlying EVP_MD_CTX instance
#[corresponds(EVP_MD_CTX_reset)]
#[cfg(ossl111)]
#[inline]
pub fn reset(&mut self) -> Result<(), ErrorStack> {
unsafe {
let _ = cvt(ffi::EVP_MD_CTX_reset(self.as_ptr()))?;
Ok(())
}
}
}
#[cfg(test)]
mod test {
use super::*;
use crate::md::Md;
use crate::pkey::PKey;
use crate::rsa::Rsa;
#[test]
fn verify_fail() {
let key1 = Rsa::generate(4096).unwrap();
let key1 = PKey::from_rsa(key1).unwrap();
let md = Md::sha256();
let data = b"Some Crypto Text";
let mut ctx = MdCtx::new().unwrap();
ctx.digest_sign_init(Some(md), &key1).unwrap();
ctx.digest_sign_update(data).unwrap();
let mut signature = vec![];
ctx.digest_sign_final_to_vec(&mut signature).unwrap();
let bad_data = b"Some Crypto text";
ctx.digest_verify_init(Some(md), &key1).unwrap();
ctx.digest_verify_update(bad_data).unwrap();
let valid = ctx.digest_verify_final(&signature).unwrap();
assert!(!valid);
}
#[test]
fn verify_success() {
let key1 = Rsa::generate(2048).unwrap();
let key1 = PKey::from_rsa(key1).unwrap();
let md = Md::sha256();
let data = b"Some Crypto Text";
let mut ctx = MdCtx::new().unwrap();
ctx.digest_sign_init(Some(md), &key1).unwrap();
ctx.digest_sign_update(data).unwrap();
let mut signature = vec![];
ctx.digest_sign_final_to_vec(&mut signature).unwrap();
let good_data = b"Some Crypto Text";
ctx.digest_verify_init(Some(md), &key1).unwrap();
ctx.digest_verify_update(good_data).unwrap();
let valid = ctx.digest_verify_final(&signature).unwrap();
assert!(valid);
}
#[test]
fn verify_with_public_success() {
let rsa = Rsa::generate(2048).unwrap();
let key1 = PKey::from_rsa(rsa.clone()).unwrap();
let md = Md::sha256();
let data = b"Some Crypto Text";
let mut ctx = MdCtx::new().unwrap();
ctx.digest_sign_init(Some(md), &key1).unwrap();
ctx.digest_sign_update(data).unwrap();
let mut signature = vec![];
ctx.digest_sign_final_to_vec(&mut signature).unwrap();
let good_data = b"Some Crypto Text";
// try to verify using only public components of the key
let n = rsa.n().to_owned().unwrap();
let e = rsa.e().to_owned().unwrap();
let rsa = Rsa::from_public_components(n, e).unwrap();
let key1 = PKey::from_rsa(rsa).unwrap();
ctx.digest_verify_init(Some(md), &key1).unwrap();
ctx.digest_verify_update(good_data).unwrap();
let valid = ctx.digest_verify_final(&signature).unwrap();
assert!(valid);
}
#[test]
fn verify_md_ctx_size() {
let mut ctx = MdCtx::new().unwrap();
ctx.digest_init(Md::sha224()).unwrap();
assert_eq!(Md::sha224().size(), ctx.size());
assert_eq!(Md::sha224().size(), 28);
let mut ctx = MdCtx::new().unwrap();
ctx.digest_init(Md::sha256()).unwrap();
assert_eq!(Md::sha256().size(), ctx.size());
assert_eq!(Md::sha256().size(), 32);
let mut ctx = MdCtx::new().unwrap();
ctx.digest_init(Md::sha384()).unwrap();
assert_eq!(Md::sha384().size(), ctx.size());
assert_eq!(Md::sha384().size(), 48);
let mut ctx = MdCtx::new().unwrap();
ctx.digest_init(Md::sha512()).unwrap();
assert_eq!(Md::sha512().size(), ctx.size());
assert_eq!(Md::sha512().size(), 64);
}
#[test]
#[cfg(ossl111)]
fn verify_md_ctx_reset() {
let hello_expected =
hex::decode("185f8db32271fe25f561a6fc938b2e264306ec304eda518007d1764826381969")
.unwrap();
let world_expected =
hex::decode("78ae647dc5544d227130a0682a51e30bc7777fbb6d8a8f17007463a3ecd1d524")
.unwrap();
// Calculate SHA-256 digest of "Hello"
let mut ctx = MdCtx::new().unwrap();
ctx.digest_init(Md::sha256()).unwrap();
ctx.digest_update(b"Hello").unwrap();
let mut result = vec![0; 32];
let result_len = ctx.digest_final(result.as_mut_slice()).unwrap();
assert_eq!(result_len, result.len());
// Validate result of "Hello"
assert_eq!(result, hello_expected);
// Create new context
let mut ctx = MdCtx::new().unwrap();
// Initialize and update to "Hello"
ctx.digest_init(Md::sha256()).unwrap();
ctx.digest_update(b"Hello").unwrap();
// Now reset, init to SHA-256 and use "World"
ctx.reset().unwrap();
ctx.digest_init(Md::sha256()).unwrap();
ctx.digest_update(b"World").unwrap();
let mut reset_result = vec![0; 32];
let result_len = ctx.digest_final(reset_result.as_mut_slice()).unwrap();
assert_eq!(result_len, reset_result.len());
// Validate result of digest of "World"
assert_eq!(reset_result, world_expected);
}
}
|