1 files changed, 90 insertions, 0 deletions
diff --git a/vendor/ed25519-compact/src/common.rs b/vendor/ed25519-compact/src/common.rs
new file mode 100644
index 000000000..12f28c519
--- /dev/null
+++ b/vendor/ed25519-compact/src/common.rs
@@ -0,0 +1,90 @@
+use core::ops::{Deref, DerefMut};
+use core::ptr;
+use core::sync::atomic;
+
+use super::error::Error;
+
+/// A seed, which a key pair can be derived from.
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
+pub struct Seed([u8; Seed::BYTES]);
+
+impl From<[u8; 32]> for Seed {
+    fn from(seed: [u8; 32]) -> Self {
+        Seed(seed)
+    }
+}
+
+impl Seed {
+    /// Number of raw bytes in a seed.
+    pub const BYTES: usize = 32;
+
+    /// Creates a seed from raw bytes.
+    pub fn new(seed: [u8; Seed::BYTES]) -> Self {
+        Seed(seed)
+    }
+
+    /// Creates a seed from a slice.
+    pub fn from_slice(seed: &[u8]) -> Result<Self, Error> {
+        let mut seed_ = [0u8; Seed::BYTES];
+        if seed.len() != seed_.len() {
+            return Err(Error::InvalidSeed);
+        }
+        seed_.copy_from_slice(seed);
+        Ok(Seed::new(seed_))
+    }
+
+    /// Tentatively overwrite the content of the seed with zeros.
+    pub fn wipe(self) {
+        Mem::wipe(self.0)
+    }
+}
+
+#[cfg(feature = "random")]
+impl Default for Seed {
+    /// Generates a random seed.
+    fn default() -> Self {
+        let mut seed = [0u8; Seed::BYTES];
+        getrandom::getrandom(&mut seed).expect("RNG failure");
+        Seed(seed)
+    }
+}
+
+#[cfg(feature = "random")]
+impl Seed {
+    /// Generates a random seed.
+    pub fn generate() -> Self {
+        Seed::default()
+    }
+}
+
+impl Deref for Seed {
+    type Target = [u8; Seed::BYTES];
+
+    /// Returns a seed as raw bytes.
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
+impl DerefMut for Seed {
+    /// Returns a seed as mutable raw bytes.
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        &mut self.0
+    }
+}
+
+pub(crate) struct Mem;
+
+impl Mem {
+    #[inline]
+    pub fn wipe<T: Default>(mut x: impl AsMut<[T]>) {
+        let x = x.as_mut();
+        for i in 0..x.len() {
+            unsafe {
+                ptr::write_volatile(x.as_mut_ptr().add(i), T::default());
+            }
+        }
+        atomic::compiler_fence(atomic::Ordering::SeqCst);
+        atomic::fence(atomic::Ordering::SeqCst);
+    }
+}