1 files changed, 184 insertions, 0 deletions
diff --git a/thirdparty/BLAKE3/src/traits.rs b/thirdparty/BLAKE3/src/traits.rs
new file mode 100644
index 000000000..9704e0106
--- /dev/null
+++ b/thirdparty/BLAKE3/src/traits.rs
@@ -0,0 +1,184 @@
+//! Implementations of commonly used traits like
+//! [`digest::Digest`](https://crates.io/crates/digest) and
+//! [`crypto_mac::Mac`](https://crates.io/crates/crypto-mac).
+
+pub use crypto_mac;
+pub use digest;
+
+use crate::{Hasher, OutputReader};
+use digest::generic_array::{
+    typenum::{U32, U64},
+    GenericArray,
+};
+
+impl digest::BlockInput for Hasher {
+    type BlockSize = U64;
+}
+
+impl digest::Update for Hasher {
+    #[inline]
+    fn update(&mut self, data: impl AsRef<[u8]>) {
+        self.update(data.as_ref());
+    }
+}
+
+impl digest::Reset for Hasher {
+    #[inline]
+    fn reset(&mut self) {
+        self.reset(); // the inherent method
+    }
+}
+
+impl digest::FixedOutput for Hasher {
+    type OutputSize = U32;
+
+    #[inline]
+    fn finalize_into(self, out: &mut GenericArray<u8, Self::OutputSize>) {
+        out.copy_from_slice(self.finalize().as_bytes());
+    }
+
+    #[inline]
+    fn finalize_into_reset(&mut self, out: &mut GenericArray<u8, Self::OutputSize>) {
+        out.copy_from_slice(self.finalize().as_bytes());
+        self.reset();
+    }
+}
+
+impl digest::ExtendableOutput for Hasher {
+    type Reader = OutputReader;
+
+    #[inline]
+    fn finalize_xof(self) -> Self::Reader {
+        Hasher::finalize_xof(&self)
+    }
+
+    #[inline]
+    fn finalize_xof_reset(&mut self) -> Self::Reader {
+        let reader = Hasher::finalize_xof(self);
+        self.reset();
+        reader
+    }
+}
+
+impl digest::XofReader for OutputReader {
+    #[inline]
+    fn read(&mut self, buffer: &mut [u8]) {
+        self.fill(buffer);
+    }
+}
+
+impl crypto_mac::NewMac for Hasher {
+    type KeySize = U32;
+
+    #[inline]
+    fn new(key: &crypto_mac::Key<Self>) -> Self {
+        let key_bytes: [u8; 32] = (*key).into();
+        Hasher::new_keyed(&key_bytes)
+    }
+}
+
+impl crypto_mac::Mac for Hasher {
+    type OutputSize = U32;
+
+    #[inline]
+    fn update(&mut self, data: &[u8]) {
+        self.update(data);
+    }
+
+    #[inline]
+    fn reset(&mut self) {
+        self.reset();
+    }
+
+    #[inline]
+    fn finalize(self) -> crypto_mac::Output<Self> {
+        crypto_mac::Output::new(digest::Digest::finalize(self))
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn test_digest_traits() {
+        // Inherent methods.
+        let mut hasher1 = crate::Hasher::new();
+        hasher1.update(b"foo");
+        hasher1.update(b"bar");
+        hasher1.update(b"baz");
+        let out1 = hasher1.finalize();
+        let mut xof1 = [0; 301];
+        hasher1.finalize_xof().fill(&mut xof1);
+        assert_eq!(out1.as_bytes(), &xof1[..32]);
+
+        // Trait implementations.
+        let mut hasher2: crate::Hasher = digest::Digest::new();
+        digest::Digest::update(&mut hasher2, b"xxx");
+        digest::Digest::reset(&mut hasher2);
+        digest::Digest::update(&mut hasher2, b"foo");
+        digest::Digest::update(&mut hasher2, b"bar");
+        digest::Digest::update(&mut hasher2, b"baz");
+        let out2 = digest::Digest::finalize(hasher2.clone());
+        let mut xof2 = [0; 301];
+        digest::XofReader::read(
+            &mut digest::ExtendableOutput::finalize_xof(hasher2.clone()),
+            &mut xof2,
+        );
+        assert_eq!(out1.as_bytes(), &out2[..]);
+        assert_eq!(xof1[..], xof2[..]);
+
+        // Again with the resetting variants.
+        let mut hasher3: crate::Hasher = digest::Digest::new();
+        digest::Digest::update(&mut hasher3, b"foobarbaz");
+        let mut out3 = [0; 32];
+        digest::FixedOutput::finalize_into_reset(
+            &mut hasher3,
+            GenericArray::from_mut_slice(&mut out3),
+        );
+        digest::Digest::update(&mut hasher3, b"foobarbaz");
+        let mut out4 = [0; 32];
+        digest::FixedOutput::finalize_into_reset(
+            &mut hasher3,
+            GenericArray::from_mut_slice(&mut out4),
+        );
+        digest::Digest::update(&mut hasher3, b"foobarbaz");
+        let mut xof3 = [0; 301];
+        digest::XofReader::read(
+            &mut digest::ExtendableOutput::finalize_xof_reset(&mut hasher3),
+            &mut xof3,
+        );
+        digest::Digest::update(&mut hasher3, b"foobarbaz");
+        let mut xof4 = [0; 301];
+        digest::XofReader::read(
+            &mut digest::ExtendableOutput::finalize_xof_reset(&mut hasher3),
+            &mut xof4,
+        );
+        assert_eq!(out1.as_bytes(), &out3[..]);
+        assert_eq!(out1.as_bytes(), &out4[..]);
+        assert_eq!(xof1[..], xof3[..]);
+        assert_eq!(xof1[..], xof4[..]);
+    }
+
+    #[test]
+    fn test_mac_trait() {
+        // Inherent methods.
+        let key = b"some super secret key bytes fooo";
+        let mut hasher1 = crate::Hasher::new_keyed(key);
+        hasher1.update(b"foo");
+        hasher1.update(b"bar");
+        hasher1.update(b"baz");
+        let out1 = hasher1.finalize();
+
+        // Trait implementation.
+        let generic_key = (*key).into();
+        let mut hasher2: crate::Hasher = crypto_mac::NewMac::new(&generic_key);
+        crypto_mac::Mac::update(&mut hasher2, b"xxx");
+        crypto_mac::Mac::reset(&mut hasher2);
+        crypto_mac::Mac::update(&mut hasher2, b"foo");
+        crypto_mac::Mac::update(&mut hasher2, b"bar");
+        crypto_mac::Mac::update(&mut hasher2, b"baz");
+        let out2 = crypto_mac::Mac::finalize(hasher2);
+        assert_eq!(out1.as_bytes(), out2.into_bytes().as_slice());
+    }
+}