1 files changed, 127 insertions, 0 deletions
diff --git a/vendor/commoncrypto/src/hash.rs b/vendor/commoncrypto/src/hash.rs
new file mode 100644
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--- /dev/null
+++ b/vendor/commoncrypto/src/hash.rs
@@ -0,0 +1,127 @@
+// Copyright (c) 2016 Mark Lee
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+//! Idiomatic Rust wrapper for `CommonCrypto`'s `CCDigestCtx` struct.
+
+use commoncrypto_sys::{CCDigestCreate, CCDigestCtx, CCDigestDestroy, CCDigestFinal,
+                       CCDigestGetOutputSizeFromRef, CCDigestReset, CCDigestUpdate};
+use std::io;
+
+pub use commoncrypto_sys::CCDigestAlgorithm;
+
+const MAX_DIGEST_SIZE: usize = 64;
+
+macro_rules! err_from_ccdigest_retval{
+    ($func_name: expr, $val: expr) => {
+        Err(io::Error::new(io::ErrorKind::Other,
+                           format!("{} returned nonzero: {}", $func_name, $val)))
+    }
+}
+
+#[derive(PartialEq, Copy, Clone, Debug)]
+enum State {
+    Reset,
+    Updated,
+    Finalized,
+}
+
+/// Generates cryptographic hashes.
+#[derive(Debug)]
+pub struct Hasher {
+    ctx: *mut CCDigestCtx,
+    state: State,
+}
+
+impl Hasher {
+    /// Creates a new `Hasher` which will use the given cryptographic `algorithm`.
+    pub fn new(algorithm: CCDigestAlgorithm) -> Hasher {
+        let ctx: *mut CCDigestCtx;
+        unsafe {
+            ctx = CCDigestCreate(algorithm);
+        }
+        Hasher {
+            ctx: ctx,
+            state: State::Reset,
+        }
+    }
+
+    fn init(&mut self) {
+        match self.state {
+            State::Reset => return,
+            State::Updated => {
+                let _ = self.finish();
+            }
+            State::Finalized => (),
+        }
+        unsafe { CCDigestReset(self.ctx) };
+        self.state = State::Reset;
+    }
+
+    /// Feeds data into the hasher.
+    pub fn update(&mut self, data: &[u8]) -> io::Result<usize> {
+        if self.state == State::Finalized {
+            self.init();
+        }
+        let result = unsafe { CCDigestUpdate(self.ctx, data.as_ptr() as *mut _, data.len()) };
+        if result == 0 {
+            self.state = State::Updated;
+            Ok(data.len())
+        } else {
+            err_from_ccdigest_retval!("CCDigestCreate", result)
+        }
+    }
+
+    /// Finalizes digest operations and produces the digest output.
+    pub fn finish(&mut self) -> io::Result<Vec<u8>> {
+        if self.state == State::Finalized {
+            self.init();
+        }
+        let expected_len = unsafe { CCDigestGetOutputSizeFromRef(self.ctx) };
+        let mut md = vec![0; MAX_DIGEST_SIZE];
+        let result = unsafe { CCDigestFinal(self.ctx, md.as_mut_ptr()) };
+        if result == 0 {
+            self.state = State::Finalized;
+            md.truncate(expected_len);
+            Ok(md)
+        } else {
+            err_from_ccdigest_retval!("CCDigestFinal", result)
+        }
+    }
+}
+
+impl io::Write for Hasher {
+    #[inline]
+    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+        self.update(buf)
+    }
+
+    fn flush(&mut self) -> io::Result<()> {
+        Ok(())
+    }
+}
+
+impl Drop for Hasher {
+    fn drop(&mut self) {
+        if self.state != State::Finalized {
+            let _ = self.finish();
+        }
+        unsafe { CCDigestDestroy(self.ctx) }
+    }
+}