Add support for HMAC, RC4, AES-128, hex encoding, etc

Makefile

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+
+crypto: crypto.rc $(wildcard *.rs)
+	rustc crypto.rc
+	rustc --test crypto.rc
+
+clean:
+	rm -f crypto libcrypto-*.so

hex.rs

@@ -0,0 +1,91 @@
+/*
+ * Copyright 2013 Jack Lloyd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+extern mod std;
+
+pub trait ToHex {
+    pure fn to_hex() -> ~str;
+}
+
+impl &[u8]: ToHex {
+    pure fn to_hex() -> ~str {
+
+        let chars = str::chars(~"0123456789ABCDEF");
+
+        let mut s = ~"";
+
+        for uint::range(0, self.len()) |i| {
+
+            let x = self[i];
+
+            let xhi = (x >> 4) & 0x0F;
+            let xlo = (x     ) & 0x0F;
+
+            unsafe {
+                str::push_char(&mut s, chars[xhi]);
+                str::push_char(&mut s, chars[xlo]);
+            }
+        }
+
+        s
+    }
+}
+
+pub trait FromHex {
+    pure fn from_hex() -> ~[u8];
+}
+
+impl &str: FromHex {
+    pure fn from_hex() -> ~[u8] {
+        let mut vec = vec::with_capacity(self.len() / 2);
+
+        for str::each_chari(self) |i,c| {
+
+            let nibble =
+                if c >= '0' && c <= '9' { (c as u8) - 0x30 }
+                else if c >= 'a' && c <= 'f' { (c as u8) - (0x61 - 10) }
+                else if c >= 'A' && c <= 'F' { (c as u8) - (0x41 - 10) }
+                else { fail ~"bad hex character"; };
+
+            if i % 2 == 0 {
+                unsafe {
+                    vec::push(&mut vec, nibble << 4);
+                }
+            }
+            else {
+                vec[i/2] |= nibble;
+            }
+        }
+
+        vec
+    }
+}
+
+#[cfg(test)]
+mod tests {
+
+    #[test]
+    pub fn test() {
+
+        assert [05u8, 0xffu8, 0x00u8, 0x59u8].to_hex() == ~"05FF0059";
+
+        assert "00FFA9D1F5".from_hex() == ~[0, 0xff, 0xa9, 0xd1, 0xf5];
+
+        assert "00FFA9D1F5".from_hex().to_hex() == ~"00FFA9D1F5";
+    }
+
+
+}

hmac.rs

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+/*
+ * Copyright 2013 Jack Lloyd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+use hash::*;
+
+#[allow(non_camel_case_types)]
+struct HMAC_CTX {
+    mut md: EVP_MD,
+    mut md_ctx: EVP_MD_CTX,
+    mut i_ctx: EVP_MD_CTX,
+    mut o_ctx: EVP_MD_CTX,
+    mut key_length: libc::c_uint,
+    mut key: [libc::c_uchar * 128]
+}
+
+#[link_name = "crypto"]
+#[abi = "cdecl"]
+extern mod libcrypto {
+
+    fn HMAC_CTX_init(ctx: *mut HMAC_CTX, key: *u8, keylen: libc::c_int, md: EVP_MD);
+
+    fn HMAC_Update(ctx: *mut HMAC_CTX, input: *u8, len: libc::c_uint);
+
+    fn HMAC_Final(ctx: *mut HMAC_CTX, output: *mut u8, len: *mut libc::c_uint);
+}
+
+pub struct HMAC {
+    priv mut ctx: HMAC_CTX,
+    priv len: uint,
+}
+
+pub fn HMAC(ht: HashType, key: ~[u8]) -> HMAC {
+    unsafe {
+
+        let (evp, mdlen) = evpmd(ht);
+
+        let mut ctx : HMAC_CTX = HMAC_CTX {
+            mut md: ptr::null(),
+            mut md_ctx: ptr::null(),
+            mut i_ctx: ptr::null(),
+            mut o_ctx: ptr::null(),
+            mut key_length: 0,
+            mut key: [0u8, .. 128]
+        };
+
+        libcrypto::HMAC_CTX_init(&mut ctx,
+                                 vec::raw::to_ptr(key),
+                                 key.len() as libc::c_int,
+                                 evp);
+
+        HMAC { ctx: ctx, len: mdlen }
+    }
+}
+
+pub impl HMAC {
+    fn update(data: &[u8]) unsafe {
+        do vec::as_imm_buf(data) |pdata, len| {
+            libcrypto::HMAC_Update(&mut self.ctx, pdata, len as libc::c_uint)
+        }
+    }
+
+    fn final() -> ~[u8] unsafe {
+        let mut res = vec::from_elem(self.len, 0u8);
+        let mut outlen: libc::c_uint = 0;
+        do vec::as_mut_buf(res) |pres, _len| {
+            libcrypto::HMAC_Final(&mut self.ctx, pres, &mut outlen);
+            assert self.len == outlen as uint
+        }
+        res
+    }
+}
+
+fn main() {
+    let h = HMAC(SHA512, ~[00u8]);
+
+    h.update(~[00u8]);
+
+    io::println(fmt!("%?", h.final()))
+}