Shift directory structure

7 files changed, 1324 insertions, 0 deletions

diff --git a/src/crypto/hash.rs b/src/crypto/hash.rs
new file mode 100644
index 00000000..1a1b6e8a
--- /dev/null
+++ b/src/crypto/hash.rs
@@ -0,0 +1,187 @@
+use libc;
+use libc::c_uint;
+use std::ptr;
+
+pub enum HashType {
+    MD5,
+    SHA1,
+    SHA224,
+    SHA256,
+    SHA384,
+    SHA512
+}
+
+#[allow(dead_code)]
+#[allow(non_camel_case_types)]
+pub struct EVP_MD_CTX {
+    digest: *mut EVP_MD,
+    engine: *mut libc::c_void,
+    flags: libc::c_ulong,
+    md_data: *mut libc::c_void,
+    pctx: *mut EVP_PKEY_CTX,
+    update: *mut libc::c_void
+}
+
+#[allow(non_camel_case_types)]
+pub struct EVP_MD;
+
+#[allow(non_camel_case_types)]
+pub struct EVP_PKEY_CTX;
+
+#[link(name = "crypto")]
+extern {
+    fn EVP_MD_CTX_create() -> *mut EVP_MD_CTX;
+    fn EVP_MD_CTX_destroy(ctx: *mut EVP_MD_CTX);
+
+    fn EVP_md5() -> *const EVP_MD;
+    fn EVP_sha1() -> *const EVP_MD;
+    fn EVP_sha224() -> *const EVP_MD;
+    fn EVP_sha256() -> *const EVP_MD;
+    fn EVP_sha384() -> *const EVP_MD;
+    fn EVP_sha512() -> *const EVP_MD;
+
+    fn EVP_DigestInit(ctx: *mut EVP_MD_CTX, typ: *const EVP_MD);
+    fn EVP_DigestUpdate(ctx: *mut EVP_MD_CTX, data: *const u8, n: c_uint);
+    fn EVP_DigestFinal(ctx: *mut EVP_MD_CTX, res: *mut u8, n: *mut u32);
+}
+
+pub fn evpmd(t: HashType) -> (*const EVP_MD, uint) {
+    unsafe {
+        match t {
+            MD5 => (EVP_md5(), 16u),
+            SHA1 => (EVP_sha1(), 20u),
+            SHA224 => (EVP_sha224(), 28u),
+            SHA256 => (EVP_sha256(), 32u),
+            SHA384 => (EVP_sha384(), 48u),
+            SHA512 => (EVP_sha512(), 64u),
+        }
+    }
+}
+
+#[allow(dead_code)]
+pub struct Hasher {
+    evp: *const EVP_MD,
+    ctx: *mut EVP_MD_CTX,
+    len: uint,
+}
+
+impl Hasher {
+    pub fn new(ht: HashType) -> Hasher {
+        let ctx = unsafe { EVP_MD_CTX_create() };
+        let (evp, mdlen) = evpmd(ht);
+        unsafe {
+            EVP_DigestInit(ctx, evp);
+        }
+
+        Hasher { evp: evp, ctx: ctx, len: mdlen }
+    }
+
+    /// Update this hasher with more input bytes
+    pub fn update(&self, data: &[u8]) {
+        unsafe {
+            EVP_DigestUpdate(self.ctx, data.as_ptr(), data.len() as c_uint)
+        }
+    }
+
+    /**
+     * Return the digest of all bytes added to this hasher since its last
+     * initialization
+     */
+    pub fn final(&self) -> Vec<u8> {
+        unsafe {
+            let mut res = Vec::from_elem(self.len, 0u8);
+            EVP_DigestFinal(self.ctx, res.as_mut_ptr(), ptr::mut_null());
+            res
+        }
+    }
+}
+
+impl Drop for Hasher {
+    fn drop(&mut self) {
+        unsafe {
+            EVP_MD_CTX_destroy(self.ctx);
+        }
+    }
+}
+
+/**
+ * Hashes the supplied input data using hash t, returning the resulting hash
+ * value
+ */
+pub fn hash(t: HashType, data: &[u8]) -> Vec<u8> {
+    let h = Hasher::new(t);
+    h.update(data);
+    h.final()
+}
+
+#[cfg(test)]
+mod tests {
+    use serialize::hex::{FromHex, ToHex};
+
+    struct HashTest {
+        input: Vec<u8>,
+        expected_output: String
+    }
+
+    fn HashTest(input: &str, output: &str) -> HashTest {
+        HashTest { input: input.from_hex().unwrap(),
+                   expected_output: output.to_string() }
+    }
+
+    fn hash_test(hashtype: super::HashType, hashtest: &HashTest) {
+        let calced_raw = super::hash(hashtype, hashtest.input.as_slice());
+
+        let calced = calced_raw.as_slice().to_hex().into_string();
+
+        if calced != hashtest.expected_output {
+            println!("Test failed - {} != {}", calced, hashtest.expected_output);
+        }
+
+        assert!(calced == hashtest.expected_output);
+    }
+
+    // Test vectors from http://www.nsrl.nist.gov/testdata/
+    #[test]
+    fn test_md5() {
+        let tests = [
+            HashTest("", "d41d8cd98f00b204e9800998ecf8427e"),
+            HashTest("7F", "83acb6e67e50e31db6ed341dd2de1595"),
+            HashTest("EC9C", "0b07f0d4ca797d8ac58874f887cb0b68"),
+            HashTest("FEE57A", "e0d583171eb06d56198fc0ef22173907"),
+            HashTest("42F497E0", "7c430f178aefdf1487fee7144e9641e2"),
+            HashTest("C53B777F1C", "75ef141d64cb37ec423da2d9d440c925"),
+            HashTest("89D5B576327B", "ebbaf15eb0ed784c6faa9dc32831bf33"),
+            HashTest("5D4CCE781EB190", "ce175c4b08172019f05e6b5279889f2c"),
+            HashTest("81901FE94932D7B9", "cd4d2f62b8cdb3a0cf968a735a239281"),
+            HashTest("C9FFDEE7788EFB4EC9", "e0841a231ab698db30c6c0f3f246c014"),
+            HashTest("66AC4B7EBA95E53DC10B", "a3b3cea71910d9af56742aa0bb2fe329"),
+            HashTest("A510CD18F7A56852EB0319", "577e216843dd11573574d3fb209b97d8"),
+            HashTest("AAED18DBE8938C19ED734A8D", "6f80fb775f27e0a4ce5c2f42fc72c5f1")];
+
+        for test in tests.iter() {
+            hash_test(super::MD5, test);
+        }
+    }
+
+    #[test]
+    fn test_sha1() {
+        let tests = [
+            HashTest("616263", "a9993e364706816aba3e25717850c26c9cd0d89d"),
+            ];
+
+        for test in tests.iter() {
+            hash_test(super::SHA1, test);
+        }
+    }
+
+    #[test]
+    fn test_sha256() {
+        let tests = [
+            HashTest("616263", "ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad")
+            ];
+
+        for test in tests.iter() {
+            hash_test(super::SHA256, test);
+        }
+    }
+}
diff --git a/src/crypto/hmac.rs b/src/crypto/hmac.rs
new file mode 100644
index 00000000..16be0f29
--- /dev/null
+++ b/src/crypto/hmac.rs
@@ -0,0 +1,259 @@
+/*
+ * 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 libc::{c_uchar, c_int, c_uint};
+use crypto::hash;
+
+#[allow(dead_code)]
+#[allow(non_camel_case_types)]
+pub struct HMAC_CTX {
+    md: *mut hash::EVP_MD,
+    md_ctx: hash::EVP_MD_CTX,
+    i_ctx: hash::EVP_MD_CTX,
+    o_ctx: hash::EVP_MD_CTX,
+    key_length: c_uint,
+    key: [c_uchar, ..128]
+}
+
+#[link(name = "crypto")]
+extern {
+    fn HMAC_CTX_init(ctx: *mut HMAC_CTX);
+    fn HMAC_Init_ex(ctx: *mut HMAC_CTX, key: *const u8, keylen: c_int, md: *const hash::EVP_MD, imple: *const ENGINE);
+    fn HMAC_Update(ctx: *mut HMAC_CTX, input: *const u8, len: c_uint);
+    fn HMAC_Final(ctx: *mut HMAC_CTX, output: *mut u8, len: *mut c_uint);
+}
+
+#[allow(non_camel_case_types)]
+struct ENGINE;
+
+pub struct HMAC {
+    ctx: HMAC_CTX,
+    len: uint,
+}
+
+#[allow(non_snake_case_functions)]
+pub fn HMAC(ht: hash::HashType, key: &[u8]) -> HMAC {
+    unsafe {
+        let (evp, mdlen) = hash::evpmd(ht);
+
+        let mut ctx : HMAC_CTX = ::std::mem::uninitialized();
+
+        HMAC_CTX_init(&mut ctx);
+        HMAC_Init_ex(&mut ctx,
+                     key.as_ptr(),
+                     key.len() as c_int,
+                     evp, 0 as *const _);
+
+        HMAC { ctx: ctx, len: mdlen }
+    }
+}
+
+impl HMAC {
+    pub fn update(&mut self, data: &[u8]) {
+        unsafe {
+            HMAC_Update(&mut self.ctx, data.as_ptr(), data.len() as c_uint)
+        }
+    }
+
+    pub fn final(&mut self) -> Vec<u8> {
+        unsafe {
+            let mut res = Vec::from_elem(self.len, 0u8);
+            let mut outlen = 0;
+            HMAC_Final(&mut self.ctx, res.as_mut_ptr(), &mut outlen);
+            assert!(self.len == outlen as uint)
+            res
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use serialize::hex::FromHex;
+    use crypto::hash::{HashType, MD5, SHA1, SHA224, SHA256, SHA384, SHA512};
+    use super::HMAC;
+
+    #[test]
+    fn test_hmac_md5() {
+        // test vectors from RFC 2202
+        let tests: [(Vec<u8>, Vec<u8>, Vec<u8>), ..7] = [
+            (Vec::from_elem(16, 0x0b_u8), Vec::from_slice(b"Hi There"),
+             "9294727a3638bb1c13f48ef8158bfc9d".from_hex().unwrap()),
+            (Vec::from_slice(b"Jefe"),
+             Vec::from_slice(b"what do ya want for nothing?"),
+             "750c783e6ab0b503eaa86e310a5db738".from_hex().unwrap()),
+            (Vec::from_elem(16, 0xaa_u8), Vec::from_elem(50, 0xdd_u8),
+             "56be34521d144c88dbb8c733f0e8b3f6".from_hex().unwrap()),
+            ("0102030405060708090a0b0c0d0e0f10111213141516171819".from_hex().unwrap(),
+             Vec::from_elem(50, 0xcd_u8),
+             "697eaf0aca3a3aea3a75164746ffaa79".from_hex().unwrap()),
+            (Vec::from_elem(16, 0x0c_u8),
+             Vec::from_slice(b"Test With Truncation"),
+             "56461ef2342edc00f9bab995690efd4c".from_hex().unwrap()),
+            (Vec::from_elem(80, 0xaa_u8),
+             Vec::from_slice(b"Test Using Larger Than Block-Size Key - Hash Key First"),
+             "6b1ab7fe4bd7bf8f0b62e6ce61b9d0cd".from_hex().unwrap()),
+            (Vec::from_elem(80, 0xaa_u8),
+             Vec::from_slice(b"Test Using Larger Than Block-Size Key \
+                               and Larger Than One Block-Size Data"),
+             "6f630fad67cda0ee1fb1f562db3aa53e".from_hex().unwrap())
+        ];
+
+        for &(ref key, ref data, ref res) in tests.iter() {
+            let mut hmac = HMAC(MD5, key.as_slice());
+            hmac.update(data.as_slice());
+            assert_eq!(hmac.final(), *res);
+        }
+    }
+
+    #[test]
+    fn test_hmac_sha1() {
+        // test vectors from RFC 2202
+        let tests: [(Vec<u8>, Vec<u8>, Vec<u8>), ..7] = [
+            (Vec::from_elem(20, 0x0b_u8), Vec::from_slice(b"Hi There"),
+             "b617318655057264e28bc0b6fb378c8ef146be00".from_hex().unwrap()),
+            (Vec::from_slice(b"Jefe"),
+             Vec::from_slice(b"what do ya want for nothing?"),
+             "effcdf6ae5eb2fa2d27416d5f184df9c259a7c79".from_hex().unwrap()),
+            (Vec::from_elem(20, 0xaa_u8), Vec::from_elem(50, 0xdd_u8),
+             "125d7342b9ac11cd91a39af48aa17b4f63f175d3".from_hex().unwrap()),
+            ("0102030405060708090a0b0c0d0e0f10111213141516171819".from_hex().unwrap(),
+             Vec::from_elem(50, 0xcd_u8),
+             "4c9007f4026250c6bc8414f9bf50c86c2d7235da".from_hex().unwrap()),
+            (Vec::from_elem(20, 0x0c_u8),
+             Vec::from_slice(b"Test With Truncation"),
+             "4c1a03424b55e07fe7f27be1d58bb9324a9a5a04".from_hex().unwrap()),
+            (Vec::from_elem(80, 0xaa_u8),
+             Vec::from_slice(b"Test Using Larger Than Block-Size Key - Hash Key First"),
+             "aa4ae5e15272d00e95705637ce8a3b55ed402112".from_hex().unwrap()),
+            (Vec::from_elem(80, 0xaa_u8),
+             Vec::from_slice(b"Test Using Larger Than Block-Size Key \
+                               and Larger Than One Block-Size Data"),
+             "e8e99d0f45237d786d6bbaa7965c7808bbff1a91".from_hex().unwrap())
+        ];
+
+        for &(ref key, ref data, ref res) in tests.iter() {
+            let mut hmac = HMAC(SHA1, key.as_slice());
+            hmac.update(data.as_slice());
+            assert_eq!(hmac.final(), *res);
+        }
+    }
+
+    fn test_sha2(ty: HashType, results: &[Vec<u8>]) {
+        // test vectors from RFC 4231
+        let tests: [(Vec<u8>, Vec<u8>), ..6] = [
+            (Vec::from_elem(20, 0x0b_u8), Vec::from_slice(b"Hi There")),
+            (Vec::from_slice(b"Jefe"),
+             Vec::from_slice(b"what do ya want for nothing?")),
+            (Vec::from_elem(20, 0xaa_u8), Vec::from_elem(50, 0xdd_u8)),
+            ("0102030405060708090a0b0c0d0e0f10111213141516171819".from_hex().unwrap(),
+             Vec::from_elem(50, 0xcd_u8)),
+            (Vec::from_elem(131, 0xaa_u8),
+             Vec::from_slice(b"Test Using Larger Than Block-Size Key - Hash Key First")),
+            (Vec::from_elem(131, 0xaa_u8),
+             Vec::from_slice(b"This is a test using a larger than block-size key and a \
+                               larger than block-size data. The key needs to be hashed \
+                               before being used by the HMAC algorithm."))
+        ];
+
+        for (&(ref key, ref data), res) in tests.iter().zip(results.iter()) {
+            let mut hmac = HMAC(ty, key.as_slice());
+            hmac.update(data.as_slice());
+            assert_eq!(hmac.final(), *res);
+        }
+    }
+
+    #[test]
+    fn test_hmac_sha224() {
+        let results = [
+            "896fb1128abbdf196832107cd49df33f47b4b1169912ba4f53684b22".from_hex().unwrap(),
+            "a30e01098bc6dbbf45690f3a7e9e6d0f8bbea2a39e6148008fd05e44".from_hex().unwrap(),
+            "7fb3cb3588c6c1f6ffa9694d7d6ad2649365b0c1f65d69d1ec8333ea".from_hex().unwrap(),
+            "6c11506874013cac6a2abc1bb382627cec6a90d86efc012de7afec5a".from_hex().unwrap(),
+            "95e9a0db962095adaebe9b2d6f0dbce2d499f112f2d2b7273fa6870e".from_hex().unwrap(),
+            "3a854166ac5d9f023f54d517d0b39dbd946770db9c2b95c9f6f565d1".from_hex().unwrap()
+        ];
+        test_sha2(SHA224, results);
+    }
+
+    #[test]
+    fn test_hmac_sha256() {
+        let results = [
+            "b0344c61d8db38535ca8afceaf0bf12b881dc200c9833da726e9376c2e32cff7".from_hex().unwrap(),
+            "5bdcc146bf60754e6a042426089575c75a003f089d2739839dec58b964ec3843".from_hex().unwrap(),
+            "773ea91e36800e46854db8ebd09181a72959098b3ef8c122d9635514ced565fe".from_hex().unwrap(),
+            "82558a389a443c0ea4cc819899f2083a85f0faa3e578f8077a2e3ff46729665b".from_hex().unwrap(),
+            "60e431591ee0b67f0d8a26aacbf5b77f8e0bc6213728c5140546040f0ee37f54".from_hex().unwrap(),
+            "9b09ffa71b942fcb27635fbcd5b0e944bfdc63644f0713938a7f51535c3a35e2".from_hex().unwrap()
+        ];
+        test_sha2(SHA256, results);
+    }
+
+    #[test]
+    fn test_hmac_sha384() {
+        let results = [
+            "afd03944d84895626b0825f4ab46907f\
+             15f9dadbe4101ec682aa034c7cebc59c\
+             faea9ea9076ede7f4af152e8b2fa9cb6".from_hex().unwrap(),
+            "af45d2e376484031617f78d2b58a6b1b\
+             9c7ef464f5a01b47e42ec3736322445e\
+             8e2240ca5e69e2c78b3239ecfab21649".from_hex().unwrap(),
+            "88062608d3e6ad8a0aa2ace014c8a86f\
+             0aa635d947ac9febe83ef4e55966144b\
+             2a5ab39dc13814b94e3ab6e101a34f27".from_hex().unwrap(),
+            "3e8a69b7783c25851933ab6290af6ca7\
+             7a9981480850009cc5577c6e1f573b4e\
+             6801dd23c4a7d679ccf8a386c674cffb".from_hex().unwrap(),
+            "4ece084485813e9088d2c63a041bc5b4\
+             4f9ef1012a2b588f3cd11f05033ac4c6\
+             0c2ef6ab4030fe8296248df163f44952".from_hex().unwrap(),
+            "6617178e941f020d351e2f254e8fd32c\
+             602420feb0b8fb9adccebb82461e99c5\
+             a678cc31e799176d3860e6110c46523e".from_hex().unwrap()
+        ];
+        test_sha2(SHA384, results);
+    }
+
+    #[test]
+    fn test_hmac_sha512() {
+        let results = [
+            "87aa7cdea5ef619d4ff0b4241a1d6cb0\
+             2379f4e2ce4ec2787ad0b30545e17cde\
+             daa833b7d6b8a702038b274eaea3f4e4\
+             be9d914eeb61f1702e696c203a126854".from_hex().unwrap(),
+            "164b7a7bfcf819e2e395fbe73b56e0a3\
+             87bd64222e831fd610270cd7ea250554\
+             9758bf75c05a994a6d034f65f8f0e6fd\
+             caeab1a34d4a6b4b636e070a38bce737".from_hex().unwrap(),
+            "fa73b0089d56a284efb0f0756c890be9\
+             b1b5dbdd8ee81a3655f83e33b2279d39\
+             bf3e848279a722c806b485a47e67c807\
+             b946a337bee8942674278859e13292fb".from_hex().unwrap(),
+            "b0ba465637458c6990e5a8c5f61d4af7\
+             e576d97ff94b872de76f8050361ee3db\
+             a91ca5c11aa25eb4d679275cc5788063\
+             a5f19741120c4f2de2adebeb10a298dd".from_hex().unwrap(),
+            "80b24263c7c1a3ebb71493c1dd7be8b4\
+             9b46d1f41b4aeec1121b013783f8f352\
+             6b56d037e05f2598bd0fd2215d6a1e52\
+             95e64f73f63f0aec8b915a985d786598".from_hex().unwrap(),
+            "e37b6a775dc87dbaa4dfa9f96e5e3ffd\
+             debd71f8867289865df5a32d20cdc944\
+             b6022cac3c4982b10d5eeb55c3e4de15\
+             134676fb6de0446065c97440fa8c6a58".from_hex().unwrap()
+        ];
+        test_sha2(SHA512, results);
+    }
+}
diff --git a/src/crypto/mod.rs b/src/crypto/mod.rs
new file mode 100644
index 00000000..d7c62f98
--- /dev/null
+++ b/src/crypto/mod.rs
@@ -0,0 +1,23 @@
+/*
+ * Copyright 2011 Google Inc.
+ *           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.
+ */
+
+pub mod hash;
+pub mod hmac;
+pub mod pkcs5;
+pub mod pkey;
+pub mod rand;
+pub mod symm;
diff --git a/src/crypto/pkcs5.rs b/src/crypto/pkcs5.rs
new file mode 100644
index 00000000..b795d84a
--- /dev/null
+++ b/src/crypto/pkcs5.rs
@@ -0,0 +1,124 @@
+use libc::c_int;
+
+#[link(name = "crypto")]
+extern {
+    fn PKCS5_PBKDF2_HMAC_SHA1(pass: *const u8, passlen: c_int,
+                              salt: *const u8, saltlen: c_int,
+                              iter: c_int, keylen: c_int,
+                              out: *mut u8) -> c_int;
+}
+
+/// Derives a key from a password and salt using the PBKDF2-HMAC-SHA1 algorithm.
+pub fn pbkdf2_hmac_sha1(pass: &str, salt: &[u8], iter: uint, keylen: uint) -> Vec<u8> {
+    unsafe {
+        assert!(iter >= 1);
+        assert!(keylen >= 1);
+
+        let mut out = Vec::with_capacity(keylen);
+
+        let r = PKCS5_PBKDF2_HMAC_SHA1(
+                pass.as_ptr(), pass.len() as c_int,
+                salt.as_ptr(), salt.len() as c_int,
+                iter as c_int, keylen as c_int,
+                out.as_mut_ptr());
+
+        if r != 1 { fail!(); }
+
+        out.set_len(keylen);
+
+        out
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    // Test vectors from
+    // http://tools.ietf.org/html/draft-josefsson-pbkdf2-test-vectors-06
+    #[test]
+    fn test_pbkdf2_hmac_sha1() {
+        assert_eq!(
+            super::pbkdf2_hmac_sha1(
+                "password",
+                "salt".as_bytes(),
+                1u,
+                20u
+            ),
+            vec!(
+                0x0c_u8, 0x60_u8, 0xc8_u8, 0x0f_u8, 0x96_u8, 0x1f_u8, 0x0e_u8,
+                0x71_u8, 0xf3_u8, 0xa9_u8, 0xb5_u8, 0x24_u8, 0xaf_u8, 0x60_u8,
+                0x12_u8, 0x06_u8, 0x2f_u8, 0xe0_u8, 0x37_u8, 0xa6_u8
+            )
+        );
+
+        assert_eq!(
+            super::pbkdf2_hmac_sha1(
+                "password",
+                "salt".as_bytes(),
+                2u,
+                20u
+            ),
+            vec!(
+                0xea_u8, 0x6c_u8, 0x01_u8, 0x4d_u8, 0xc7_u8, 0x2d_u8, 0x6f_u8,
+                0x8c_u8, 0xcd_u8, 0x1e_u8, 0xd9_u8, 0x2a_u8, 0xce_u8, 0x1d_u8,
+                0x41_u8, 0xf0_u8, 0xd8_u8, 0xde_u8, 0x89_u8, 0x57_u8
+            )
+        );
+
+        assert_eq!(
+            super::pbkdf2_hmac_sha1(
+                "password",
+                "salt".as_bytes(),
+                4096u,
+                20u
+            ),
+            vec!(
+                0x4b_u8, 0x00_u8, 0x79_u8, 0x01_u8, 0xb7_u8, 0x65_u8, 0x48_u8,
+                0x9a_u8, 0xbe_u8, 0xad_u8, 0x49_u8, 0xd9_u8, 0x26_u8, 0xf7_u8,
+                0x21_u8, 0xd0_u8, 0x65_u8, 0xa4_u8, 0x29_u8, 0xc1_u8
+            )
+        );
+
+        assert_eq!(
+            super::pbkdf2_hmac_sha1(
+                "password",
+                "salt".as_bytes(),
+                16777216u,
+                20u
+            ),
+            vec!(
+                0xee_u8, 0xfe_u8, 0x3d_u8, 0x61_u8, 0xcd_u8, 0x4d_u8, 0xa4_u8,
+                0xe4_u8, 0xe9_u8, 0x94_u8, 0x5b_u8, 0x3d_u8, 0x6b_u8, 0xa2_u8,
+                0x15_u8, 0x8c_u8, 0x26_u8, 0x34_u8, 0xe9_u8, 0x84_u8
+            )
+        );
+
+        assert_eq!(
+            super::pbkdf2_hmac_sha1(
+                "passwordPASSWORDpassword",
+                "saltSALTsaltSALTsaltSALTsaltSALTsalt".as_bytes(),
+                4096u,
+                25u
+            ),
+            vec!(
+                0x3d_u8, 0x2e_u8, 0xec_u8, 0x4f_u8, 0xe4_u8, 0x1c_u8, 0x84_u8,
+                0x9b_u8, 0x80_u8, 0xc8_u8, 0xd8_u8, 0x36_u8, 0x62_u8, 0xc0_u8,
+                0xe4_u8, 0x4a_u8, 0x8b_u8, 0x29_u8, 0x1a_u8, 0x96_u8, 0x4c_u8,
+                0xf2_u8, 0xf0_u8, 0x70_u8, 0x38_u8
+            )
+        );
+
+        assert_eq!(
+            super::pbkdf2_hmac_sha1(
+                "pass\x00word",
+                "sa\x00lt".as_bytes(),
+                4096u,
+                16u
+            ),
+            vec!(
+                0x56_u8, 0xfa_u8, 0x6a_u8, 0xa7_u8, 0x55_u8, 0x48_u8, 0x09_u8,
+                0x9d_u8, 0xcc_u8, 0x37_u8, 0xd7_u8, 0xf0_u8, 0x34_u8, 0x25_u8,
+                0xe0_u8, 0xc3_u8
+            )
+        );
+    }
+}
diff --git a/src/crypto/pkey.rs b/src/crypto/pkey.rs
new file mode 100644
index 00000000..5f617fa7
--- /dev/null
+++ b/src/crypto/pkey.rs
@@ -0,0 +1,425 @@
+use libc::{c_char, c_int, c_uint};
+use libc;
+use std::mem;
+use std::ptr;
+use crypto::hash::{HashType, MD5, SHA1, SHA224, SHA256, SHA384, SHA512};
+
+#[allow(non_camel_case_types)]
+pub type EVP_PKEY = *mut libc::c_void;
+
+#[allow(non_camel_case_types)]
+pub type RSA = *mut libc::c_void;
+
+#[link(name = "crypto")]
+extern {
+    fn EVP_PKEY_new() -> *mut EVP_PKEY;
+    fn EVP_PKEY_free(k: *mut EVP_PKEY);
+    fn EVP_PKEY_assign(pkey: *mut EVP_PKEY, typ: c_int, key: *const c_char) -> c_int;
+    fn EVP_PKEY_get1_RSA(k: *mut EVP_PKEY) -> *mut RSA;
+
+    fn i2d_PublicKey(k: *mut EVP_PKEY, buf: *const *mut u8) -> c_int;
+    fn d2i_PublicKey(t: c_int, k: *const *mut EVP_PKEY, buf: *const *const u8, len: c_uint) -> *mut EVP_PKEY;
+    fn i2d_PrivateKey(k: *mut EVP_PKEY, buf: *const *mut u8) -> c_int;
+    fn d2i_PrivateKey(t: c_int, k: *const *mut EVP_PKEY, buf: *const *const u8, len: c_uint) -> *mut EVP_PKEY;
+
+    fn RSA_generate_key(modsz: c_uint, e: c_uint, cb: *const u8, cbarg: *const u8) -> *mut RSA;
+    fn RSA_size(k: *mut RSA) -> c_uint;
+
+    fn RSA_public_encrypt(flen: c_uint, from: *const u8, to: *mut u8, k: *mut RSA,
+                          pad: c_int) -> c_int;
+    fn RSA_private_decrypt(flen: c_uint, from: *const u8, to: *mut u8, k: *mut RSA,
+                           pad: c_int) -> c_int;
+    fn RSA_sign(t: c_int, m: *const u8, mlen: c_uint, sig: *mut u8, siglen: *mut c_uint,
+                k: *mut RSA) -> c_int;
+    fn RSA_verify(t: c_int, m: *const u8, mlen: c_uint, sig: *const u8, siglen: c_uint,
+                  k: *mut RSA) -> c_int;
+}
+
+enum Parts {
+    Neither,
+    Public,
+    Both
+}
+
+/// Represents a role an asymmetric key might be appropriate for.
+pub enum Role {
+    Encrypt,
+    Decrypt,
+    Sign,
+    Verify
+}
+
+/// Type of encryption padding to use.
+pub enum EncryptionPadding {
+    OAEP,
+    PKCS1v15
+}
+
+fn openssl_padding_code(padding: EncryptionPadding) -> c_int {
+    match padding {
+        OAEP => 4,
+        PKCS1v15 => 1
+    }
+}
+
+fn openssl_hash_nid(hash: HashType) -> c_int {
+    match hash {
+        MD5    => 4,   // NID_md5,
+        SHA1   => 64,  // NID_sha1
+        SHA224 => 675, // NID_sha224
+        SHA256 => 672, // NID_sha256
+        SHA384 => 673, // NID_sha384
+        SHA512 => 674, // NID_sha512
+    }
+}
+
+pub struct PKey {
+    evp: *mut EVP_PKEY,
+    parts: Parts,
+}
+
+/// Represents a public key, optionally with a private key attached.
+impl PKey {
+    pub fn new() -> PKey {
+        unsafe {
+            PKey {
+                evp: EVP_PKEY_new(),
+                parts: Neither,
+            }
+        }
+    }
+
+    fn _tostr(&self, f: unsafe extern "C" fn(*mut EVP_PKEY, *const *mut u8) -> c_int) -> Vec<u8> {
+        unsafe {
+            let len = f(self.evp, ptr::null());
+            if len < 0 as c_int { return vec!(); }
+            let mut s = Vec::from_elem(len as uint, 0u8);
+
+            let r = f(self.evp, &s.as_mut_ptr());
+
+            s.truncate(r as uint);
+            s
+        }
+    }
+
+    fn _fromstr(&mut self, s: &[u8], f: unsafe extern "C" fn(c_int, *const *mut EVP_PKEY, *const *const u8, c_uint) -> *mut EVP_PKEY) {
+        unsafe {
+            let evp = ptr::mut_null();
+            f(6 as c_int, &evp, &s.as_ptr(), s.len() as c_uint);
+            self.evp = evp;
+        }
+    }
+
+    pub fn gen(&mut self, keysz: uint) {
+        unsafe {
+            let rsa = RSA_generate_key(
+                keysz as c_uint,
+                65537u as c_uint,
+                ptr::null(),
+                ptr::null()
+            );
+
+            // XXX: 6 == NID_rsaEncryption
+            EVP_PKEY_assign(
+                self.evp,
+                6 as c_int,
+                mem::transmute(rsa));
+
+            self.parts = Both;
+        }
+    }
+
+    /**
+     * Returns a serialized form of the public key, suitable for load_pub().
+     */
+    pub fn save_pub(&self) -> Vec<u8> {
+        self._tostr(i2d_PublicKey)
+    }
+
+    /**
+     * Loads a serialized form of the public key, as produced by save_pub().
+     */
+    pub fn load_pub(&mut self, s: &[u8]) {
+        self._fromstr(s, d2i_PublicKey);
+        self.parts = Public;
+    }
+
+    /**
+     * Returns a serialized form of the public and private keys, suitable for
+     * load_priv().
+     */
+    pub fn save_priv(&self) -> Vec<u8> {
+        self._tostr(i2d_PrivateKey)
+    }
+    /**
+     * Loads a serialized form of the public and private keys, as produced by
+     * save_priv().
+     */
+    pub fn load_priv(&mut self, s: &[u8]) {
+        self._fromstr(s, d2i_PrivateKey);
+        self.parts = Both;
+    }
+
+    /**
+     * Returns the size of the public key modulus.
+     */
+    pub fn size(&self) -> uint {
+        unsafe {
+            RSA_size(EVP_PKEY_get1_RSA(self.evp)) as uint
+        }
+    }
+
+    /**
+     * Returns whether this pkey object can perform the specified role.
+     */
+    pub fn can(&self, r: Role) -> bool {
+        match r {
+            Encrypt =>
+                match self.parts {
+                    Neither => false,
+                    _ => true,
+                },
+            Verify =>
+                match self.parts {
+                    Neither => false,
+                    _ => true,
+                },
+            Decrypt =>
+                match self.parts {
+                    Both => true,
+                    _ => false,
+                },
+            Sign =>
+                match self.parts {
+                    Both => true,
+                    _ => false,
+                },
+        }
+    }
+
+    /**
+     * Returns the maximum amount of data that can be encrypted by an encrypt()
+     * call.
+     */
+    pub fn max_data(&self) -> uint {
+        unsafe {
+            let rsa = EVP_PKEY_get1_RSA(self.evp);
+            let len = RSA_size(rsa);
+
+            // 41 comes from RSA_public_encrypt(3) for OAEP
+            len as uint - 41u
+        }
+    }
+
+    pub fn encrypt_with_padding(&self, s: &[u8], padding: EncryptionPadding) -> Vec<u8> {
+        unsafe {
+            let rsa = EVP_PKEY_get1_RSA(self.evp);
+            let len = RSA_size(rsa);
+
+            assert!(s.len() < self.max_data());
+
+            let mut r = Vec::from_elem(len as uint + 1u, 0u8);
+
+            let rv = RSA_public_encrypt(
+                s.len() as c_uint,
+                s.as_ptr(),
+                r.as_mut_ptr(),
+                rsa,
+                openssl_padding_code(padding));
+
+            if rv < 0 as c_int {
+                vec!()
+            } else {
+                r.truncate(rv as uint);
+                r
+            }
+        }
+    }
+
+    pub fn decrypt_with_padding(&self, s: &[u8], padding: EncryptionPadding) -> Vec<u8> {
+        unsafe {
+            let rsa = EVP_PKEY_get1_RSA(self.evp);
+            let len = RSA_size(rsa);
+
+            assert_eq!(s.len() as c_uint, RSA_size(rsa));
+
+            let mut r = Vec::from_elem(len as uint + 1u, 0u8);
+
+            let rv = RSA_private_decrypt(
+                s.len() as c_uint,
+                s.as_ptr(),
+                r.as_mut_ptr(),
+                rsa,
+                openssl_padding_code(padding));
+
+            if rv < 0 as c_int {
+                vec!()
+            } else {
+                r.truncate(rv as uint);
+                r
+            }
+        }
+    }
+
+    /**
+     * Encrypts data using OAEP padding, returning the encrypted data. The
+     * supplied data must not be larger than max_data().
+     */
+    pub fn encrypt(&self, s: &[u8]) -> Vec<u8> { self.encrypt_with_padding(s, OAEP) }
+
+    /**
+     * Decrypts data, expecting OAEP padding, returning the decrypted data.
+     */
+    pub fn decrypt(&self, s: &[u8]) -> Vec<u8> { self.decrypt_with_padding(s, OAEP) }
+
+    /**
+     * Signs data, using OpenSSL's default scheme and sha256. Unlike encrypt(),
+     * can process an arbitrary amount of data; returns the signature.
+     */
+    pub fn sign(&self, s: &[u8]) -> Vec<u8> { self.sign_with_hash(s, SHA256) }
+
+    /**
+     * Verifies a signature s (using OpenSSL's default scheme and sha256) on a
+     * message m. Returns true if the signature is valid, and false otherwise.
+     */
+    pub fn verify(&self, m: &[u8], s: &[u8]) -> bool { self.verify_with_hash(m, s, SHA256) }
+
+    pub fn sign_with_hash(&self, s: &[u8], hash: HashType) -> Vec<u8> {
+        unsafe {
+            let rsa = EVP_PKEY_get1_RSA(self.evp);
+            let mut len = RSA_size(rsa);
+            let mut r = Vec::from_elem(len as uint + 1u, 0u8);
+
+            let rv = RSA_sign(
+                openssl_hash_nid(hash),
+                s.as_ptr(),
+                s.len() as c_uint,
+                r.as_mut_ptr(),
+                &mut len,
+                rsa);
+
+            if rv < 0 as c_int {
+                vec!()
+            } else {
+                r.truncate(len as uint);
+                r
+            }
+        }
+    }
+
+    pub fn verify_with_hash(&self, m: &[u8], s: &[u8], hash: HashType) -> bool {
+        unsafe {
+            let rsa = EVP_PKEY_get1_RSA(self.evp);
+
+            let rv = RSA_verify(
+                openssl_hash_nid(hash),
+                m.as_ptr(),
+                m.len() as c_uint,
+                s.as_ptr(),
+                s.len() as c_uint,
+                rsa
+            );
+
+            rv == 1 as c_int
+        }
+    }
+}
+
+impl Drop for PKey {
+    fn drop(&mut self) {
+        unsafe {
+            EVP_PKEY_free(self.evp);
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crypto::hash::{MD5, SHA1};
+
+    #[test]
+    fn test_gen_pub() {
+        let mut k0 = super::PKey::new();
+        let mut k1 = super::PKey::new();
+        k0.gen(512u);
+        k1.load_pub(k0.save_pub().as_slice());
+        assert_eq!(k0.save_pub(), k1.save_pub());
+        assert_eq!(k0.size(), k1.size());
+        assert!(k0.can(super::Encrypt));
+        assert!(k0.can(super::Decrypt));
+        assert!(k0.can(super::Verify));
+        assert!(k0.can(super::Sign));
+        assert!(k1.can(super::Encrypt));
+        assert!(!k1.can(super::Decrypt));
+        assert!(k1.can(super::Verify));
+        assert!(!k1.can(super::Sign));
+    }
+
+    #[test]
+    fn test_gen_priv() {
+        let mut k0 = super::PKey::new();
+        let mut k1 = super::PKey::new();
+        k0.gen(512u);
+        k1.load_priv(k0.save_priv().as_slice());
+        assert_eq!(k0.save_priv(), k1.save_priv());
+        assert_eq!(k0.size(), k1.size());
+        assert!(k0.can(super::Encrypt));
+        assert!(k0.can(super::Decrypt));
+        assert!(k0.can(super::Verify));
+        assert!(k0.can(super::Sign));
+        assert!(k1.can(super::Encrypt));
+        assert!(k1.can(super::Decrypt));
+        assert!(k1.can(super::Verify));
+        assert!(k1.can(super::Sign));
+    }
+
+    #[test]
+    fn test_encrypt() {
+        let mut k0 = super::PKey::new();
+        let mut k1 = super::PKey::new();
+        let msg = vec!(0xdeu8, 0xadu8, 0xd0u8, 0x0du8);
+        k0.gen(512u);
+        k1.load_pub(k0.save_pub().as_slice());
+        let emsg = k1.encrypt(msg.as_slice());
+        let dmsg = k0.decrypt(emsg.as_slice());
+        assert!(msg == dmsg);
+    }
+
+    #[test]
+    fn test_encrypt_pkcs() {
+        let mut k0 = super::PKey::new();
+        let mut k1 = super::PKey::new();
+        let msg = vec!(0xdeu8, 0xadu8, 0xd0u8, 0x0du8);
+        k0.gen(512u);
+        k1.load_pub(k0.save_pub().as_slice());
+        let emsg = k1.encrypt_with_padding(msg.as_slice(), super::PKCS1v15);
+        let dmsg = k0.decrypt_with_padding(emsg.as_slice(), super::PKCS1v15);
+        assert!(msg == dmsg);
+    }
+
+    #[test]
+    fn test_sign() {
+        let mut k0 = super::PKey::new();
+        let mut k1 = super::PKey::new();
+        let msg = vec!(0xdeu8, 0xadu8, 0xd0u8, 0x0du8);
+        k0.gen(512u);
+        k1.load_pub(k0.save_pub().as_slice());
+        let sig = k0.sign(msg.as_slice());
+        let rv = k1.verify(msg.as_slice(), sig.as_slice());
+        assert!(rv == true);
+    }
+
+    #[test]
+    fn test_sign_hashes() {
+        let mut k0 = super::PKey::new();
+        let mut k1 = super::PKey::new();
+        let msg = vec!(0xdeu8, 0xadu8, 0xd0u8, 0x0du8);
+        k0.gen(512u);
+        k1.load_pub(k0.save_pub().as_slice());
+
+        let sig = k0.sign_with_hash(msg.as_slice(), MD5);
+
+        assert!(k1.verify_with_hash(msg.as_slice(), sig.as_slice(), MD5));
+        assert!(!k1.verify_with_hash(msg.as_slice(), sig.as_slice(), SHA1));
+    }
+}
diff --git a/src/crypto/rand.rs b/src/crypto/rand.rs
new file mode 100644
index 00000000..9db87fcd
--- /dev/null
+++ b/src/crypto/rand.rs
@@ -0,0 +1,30 @@
+use libc::c_int;
+
+#[link(name = "crypto")]
+extern {
+    fn RAND_bytes(buf: *mut u8, num: c_int) -> c_int;
+}
+
+pub fn rand_bytes(len: uint) -> Vec<u8> {
+    unsafe {
+        let mut out = Vec::with_capacity(len);
+
+        let r = RAND_bytes(out.as_mut_ptr(), len as c_int);
+        if r != 1 as c_int { fail!() }
+
+        out.set_len(len);
+
+        out
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::rand_bytes;
+
+    #[test]
+    fn test_rand_bytes() {
+        let bytes = rand_bytes(32u);
+        println!("{}", bytes);
+    }
+}
diff --git a/src/crypto/symm.rs b/src/crypto/symm.rs
new file mode 100644
index 00000000..8d8f651c
--- /dev/null
+++ b/src/crypto/symm.rs
@@ -0,0 +1,276 @@
+use libc::{c_int, c_uint};
+use libc;
+
+#[allow(non_camel_case_types)]
+pub type EVP_CIPHER_CTX = *mut libc::c_void;
+
+#[allow(non_camel_case_types)]
+pub type EVP_CIPHER = *mut libc::c_void;
+
+#[link(name = "crypto")]
+extern {
+    fn EVP_CIPHER_CTX_new() -> EVP_CIPHER_CTX;
+    fn EVP_CIPHER_CTX_set_padding(ctx: EVP_CIPHER_CTX, padding: c_int);
+    fn EVP_CIPHER_CTX_free(ctx: EVP_CIPHER_CTX);
+
+    fn EVP_aes_128_ecb() -> EVP_CIPHER;
+    fn EVP_aes_128_cbc() -> EVP_CIPHER;
+    // fn EVP_aes_128_ctr() -> EVP_CIPHER;
+    // fn EVP_aes_128_gcm() -> EVP_CIPHER;
+
+    fn EVP_aes_256_ecb() -> EVP_CIPHER;
+    fn EVP_aes_256_cbc() -> EVP_CIPHER;
+    // fn EVP_aes_256_ctr() -> EVP_CIPHER;
+    // fn EVP_aes_256_gcm() -> EVP_CIPHER;
+
+    fn EVP_rc4() -> EVP_CIPHER;
+
+    fn EVP_CipherInit(ctx: EVP_CIPHER_CTX, evp: EVP_CIPHER,
+                      key: *const u8, iv: *const u8, mode: c_int);
+    fn EVP_CipherUpdate(ctx: EVP_CIPHER_CTX, outbuf: *mut u8,
+                        outlen: &mut c_uint, inbuf: *const u8, inlen: c_int);
+    fn EVP_CipherFinal(ctx: EVP_CIPHER_CTX, res: *mut u8, len: &mut c_int);
+}
+
+pub enum Mode {
+    Encrypt,
+    Decrypt,
+}
+
+#[allow(non_camel_case_types)]
+pub enum Type {
+    AES_128_ECB,
+    AES_128_CBC,
+    // AES_128_CTR,
+    //AES_128_GCM,
+
+    AES_256_ECB,
+    AES_256_CBC,
+    // AES_256_CTR,
+    //AES_256_GCM,
+
+    RC4_128,
+}
+
+fn evpc(t: Type) -> (EVP_CIPHER, uint, uint) {
+    unsafe {
+        match t {
+            AES_128_ECB => (EVP_aes_128_ecb(), 16u, 16u),
+            AES_128_CBC => (EVP_aes_128_cbc(), 16u, 16u),
+            // AES_128_CTR => (EVP_aes_128_ctr(), 16u, 0u),
+            //AES_128_GCM => (EVP_aes_128_gcm(), 16u, 16u),
+
+            AES_256_ECB => (EVP_aes_256_ecb(), 32u, 16u),
+            AES_256_CBC => (EVP_aes_256_cbc(), 32u, 16u),
+            // AES_256_CTR => (EVP_aes_256_ctr(), 32u, 0u),
+            //AES_256_GCM => (EVP_aes_256_gcm(), 32u, 16u),
+
+            RC4_128 => (EVP_rc4(), 16u, 0u),
+        }
+    }
+}
+
+/// Represents a symmetric cipher context.
+pub struct Crypter {
+    evp: EVP_CIPHER,
+    ctx: EVP_CIPHER_CTX,
+    keylen: uint,
+    blocksize: uint
+}
+
+impl Crypter {
+    pub fn new(t: Type) -> Crypter {
+        let ctx = unsafe { EVP_CIPHER_CTX_new() };
+        let (evp, keylen, blocksz) = evpc(t);
+        Crypter { evp: evp, ctx: ctx, keylen: keylen, blocksize: blocksz }
+    }
+
+    /**
+     * Enables or disables padding. If padding is disabled, total amount of
+     * data encrypted must be a multiple of block size.
+     */
+    pub fn pad(&self, padding: bool) {
+        if self.blocksize > 0 {
+            unsafe {
+                let v = if padding { 1 } else { 0 } as c_int;
+                EVP_CIPHER_CTX_set_padding(self.ctx, v);
+            }
+        }
+    }
+
+    /**
+     * Initializes this crypter.
+     */
+    pub fn init(&self, mode: Mode, key: &[u8], iv: Vec<u8>) {
+        unsafe {
+            let mode = match mode {
+                Encrypt => 1 as c_int,
+                Decrypt => 0 as c_int,
+            };
+            assert_eq!(key.len(), self.keylen);
+
+            EVP_CipherInit(
+                self.ctx,
+                self.evp,
+                key.as_ptr(),
+                iv.as_ptr(),
+                mode
+            )
+        }
+    }
+
+    /**
+     * Update this crypter with more data to encrypt or decrypt. Returns
+     * encrypted or decrypted bytes.
+     */
+    pub fn update(&self, data: &[u8]) -> Vec<u8> {
+        unsafe {
+            let mut res = Vec::from_elem(data.len() + self.blocksize, 0u8);
+            let mut reslen = (data.len() + self.blocksize) as u32;
+
+            EVP_CipherUpdate(
+                self.ctx,
+                res.as_mut_ptr(),
+                &mut reslen,
+                data.as_ptr(),
+                data.len() as c_int
+            );
+
+            res.truncate(reslen as uint);
+            res
+        }
+    }
+
+    /**
+     * Finish crypting. Returns the remaining partial block of output, if any.
+     */
+    pub fn final(&self) -> Vec<u8> {
+        unsafe {
+            let mut res = Vec::from_elem(self.blocksize, 0u8);
+            let mut reslen = self.blocksize as c_int;
+
+            EVP_CipherFinal(self.ctx,
+                                       res.as_mut_ptr(),
+                                       &mut reslen);
+
+            res.truncate(reslen as uint);
+            res
+        }
+    }
+}
+
+impl Drop for Crypter {
+    fn drop(&mut self) {
+        unsafe {
+            EVP_CIPHER_CTX_free(self.ctx);
+        }
+    }
+}
+
+/**
+ * Encrypts data, using the specified crypter type in encrypt mode with the
+ * specified key and iv; returns the resulting (encrypted) data.
+ */
+pub fn encrypt(t: Type, key: &[u8], iv: Vec<u8>, data: &[u8]) -> Vec<u8> {
+    let c = Crypter::new(t);
+    c.init(Encrypt, key, iv);
+    let r = c.update(data);
+    let rest = c.final();
+    r.append(rest.as_slice())
+}
+
+/**
+ * Decrypts data, using the specified crypter type in decrypt mode with the
+ * specified key and iv; returns the resulting (decrypted) data.
+ */
+pub fn decrypt(t: Type, key: &[u8], iv: Vec<u8>, data: &[u8]) -> Vec<u8> {
+    let c = Crypter::new(t);
+    c.init(Decrypt, key, iv);
+    let r = c.update(data);
+    let rest = c.final();
+    r.append(rest.as_slice())
+}
+
+#[cfg(test)]
+mod tests {
+    use serialize::hex::FromHex;
+
+    // Test vectors from FIPS-197:
+    // http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf
+    #[test]
+    fn test_aes_256_ecb() {
+        let k0 =
+           vec!(0x00u8, 0x01u8, 0x02u8, 0x03u8, 0x04u8, 0x05u8, 0x06u8, 0x07u8,
+              0x08u8, 0x09u8, 0x0au8, 0x0bu8, 0x0cu8, 0x0du8, 0x0eu8, 0x0fu8,
+              0x10u8, 0x11u8, 0x12u8, 0x13u8, 0x14u8, 0x15u8, 0x16u8, 0x17u8,
+              0x18u8, 0x19u8, 0x1au8, 0x1bu8, 0x1cu8, 0x1du8, 0x1eu8, 0x1fu8);
+        let p0 =
+           vec!(0x00u8, 0x11u8, 0x22u8, 0x33u8, 0x44u8, 0x55u8, 0x66u8, 0x77u8,
+              0x88u8, 0x99u8, 0xaau8, 0xbbu8, 0xccu8, 0xddu8, 0xeeu8, 0xffu8);
+        let c0 =
+           vec!(0x8eu8, 0xa2u8, 0xb7u8, 0xcau8, 0x51u8, 0x67u8, 0x45u8, 0xbfu8,
+              0xeau8, 0xfcu8, 0x49u8, 0x90u8, 0x4bu8, 0x49u8, 0x60u8, 0x89u8);
+        let c = super::Crypter::new(super::AES_256_ECB);
+        c.init(super::Encrypt, k0.as_slice(), vec![]);
+        c.pad(false);
+        let r0 = c.update(p0.as_slice()).append(c.final().as_slice());
+        assert!(r0 == c0);
+        c.init(super::Decrypt, k0.as_slice(), vec![]);
+        c.pad(false);
+        let p1 = c.update(r0.as_slice()).append(c.final().as_slice());
+        assert!(p1 == p0);
+    }
+
+    fn cipher_test(ciphertype: super::Type, pt: &str, ct: &str, key: &str, iv: &str) {
+        use serialize::hex::ToHex;
+
+        let cipher = super::Crypter::new(ciphertype);
+        cipher.init(super::Encrypt, key.from_hex().unwrap().as_slice(), iv.from_hex().unwrap());
+
+        let expected = Vec::from_slice(ct.from_hex().unwrap().as_slice());
+        let computed = cipher.update(pt.from_hex().unwrap().as_slice()).append(cipher.final().as_slice());
+
+        if computed != expected {
+            println!("Computed: {}", computed.as_slice().to_hex());
+            println!("Expected: {}", expected.as_slice().to_hex());
+            if computed.len() != expected.len() {
+                println!("Lengths differ: {} in computed vs {} expected",
+                         computed.len(), expected.len());
+            }
+            fail!("test failure");
+        }
+    }
+
+    #[test]
+    fn test_rc4() {
+
+        let pt = "0000000000000000000000000000000000000000000000000000000000000000000000000000";
+        let ct = "A68686B04D686AA107BD8D4CAB191A3EEC0A6294BC78B60F65C25CB47BD7BB3A48EFC4D26BE4";
+        let key = "97CD440324DA5FD1F7955C1C13B6B466";
+        let iv = "";
+
+        cipher_test(super::RC4_128, pt, ct, key, iv);
+    }
+
+    /*#[test]
+    fn test_aes128_ctr() {
+
+        let pt = ~"6BC1BEE22E409F96E93D7E117393172AAE2D8A571E03AC9C9EB76FAC45AF8E5130C81C46A35CE411E5FBC1191A0A52EFF69F2445DF4F9B17AD2B417BE66C3710";
+        let ct = ~"874D6191B620E3261BEF6864990DB6CE9806F66B7970FDFF8617187BB9FFFDFF5AE4DF3EDBD5D35E5B4F09020DB03EAB1E031DDA2FBE03D1792170A0F3009CEE";
+        let key = ~"2B7E151628AED2A6ABF7158809CF4F3C";
+        let iv = ~"F0F1F2F3F4F5F6F7F8F9FAFBFCFDFEFF";
+
+        cipher_test(super::AES_128_CTR, pt, ct, key, iv);
+    }*/
+
+    /*#[test]
+    fn test_aes128_gcm() {
+        // Test case 3 in GCM spec
+        let pt = ~"d9313225f88406e5a55909c5aff5269a86a7a9531534f7da2e4c303d8a318a721c3c0c95956809532fcf0e2449a6b525b16aedf5aa0de657ba637b391aafd255";
+        let ct = ~"42831ec2217774244b7221b784d0d49ce3aa212f2c02a4e035c17e2329aca12e21d514b25466931c7d8f6a5aac84aa051ba30b396a0aac973d58e091473f59854d5c2af327cd64a62cf35abd2ba6fab4";
+        let key = ~"feffe9928665731c6d6a8f9467308308";
+        let iv = ~"cafebabefacedbaddecaf888";
+
+        cipher_test(super::AES_128_GCM, pt, ct, key, iv);
+    }*/
+}