single `ffi` module

6 files changed, 83 insertions, 222 deletions

diff --git a/src/crypto/hash.rs b/src/crypto/hash.rs
index 4a4031e2..03d0f097 100644
--- a/src/crypto/hash.rs
+++ b/src/crypto/hash.rs
@@ -1,7 +1,8 @@
-use libc;
 use libc::c_uint;
 use std::ptr;
 
+use ffi;
+
 pub enum HashType {
     MD5,
     SHA1,
@@ -12,71 +13,33 @@ pub enum HashType {
     RIPEMD160
 }
 
-#[allow(dead_code)]
-#[allow(non_camel_case_types)]
-#[repr(C)]
-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)]
-#[repr(C)]
-pub struct EVP_MD;
-
-#[allow(non_camel_case_types)]
-#[repr(C)]
-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_ripemd160() -> *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) {
+pub fn evpmd(t: HashType) -> (*const ffi::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),
-            RIPEMD160 => (EVP_ripemd160(), 20u),
+            MD5 => (ffi::EVP_md5(), 16u),
+            SHA1 => (ffi::EVP_sha1(), 20u),
+            SHA224 => (ffi::EVP_sha224(), 28u),
+            SHA256 => (ffi::EVP_sha256(), 32u),
+            SHA384 => (ffi::EVP_sha384(), 48u),
+            SHA512 => (ffi::EVP_sha512(), 64u),
+            RIPEMD160 => (ffi::EVP_ripemd160(), 20u),
         }
     }
 }
 
 #[allow(dead_code)]
 pub struct Hasher {
-    evp: *const EVP_MD,
-    ctx: *mut EVP_MD_CTX,
+    evp: *const ffi::EVP_MD,
+    ctx: *mut ffi::EVP_MD_CTX,
     len: uint,
 }
 
 impl Hasher {
     pub fn new(ht: HashType) -> Hasher {
-        let ctx = unsafe { EVP_MD_CTX_create() };
+        let ctx = unsafe { ffi::EVP_MD_CTX_create() };
         let (evp, mdlen) = evpmd(ht);
         unsafe {
-            EVP_DigestInit(ctx, evp);
+            ffi::EVP_DigestInit(ctx, evp);
         }
 
         Hasher { evp: evp, ctx: ctx, len: mdlen }
@@ -85,7 +48,7 @@ impl Hasher {
     /// 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)
+            ffi::EVP_DigestUpdate(self.ctx, data.as_ptr(), data.len() as c_uint)
         }
     }
 
@@ -96,7 +59,7 @@ impl Hasher {
     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::null_mut());
+            ffi::EVP_DigestFinal(self.ctx, res.as_mut_ptr(), ptr::null_mut());
             res
         }
     }
@@ -105,7 +68,7 @@ impl Hasher {
 impl Drop for Hasher {
     fn drop(&mut self) {
         unsafe {
-            EVP_MD_CTX_destroy(self.ctx);
+            ffi::EVP_MD_CTX_destroy(self.ctx);
         }
     }
 }
diff --git a/src/crypto/hmac.rs b/src/crypto/hmac.rs
index 5bf62586..0d945200 100644
--- a/src/crypto/hmac.rs
+++ b/src/crypto/hmac.rs
@@ -14,35 +14,13 @@
  * limitations under the License.
  */
 
-use libc::{c_uchar, c_int, c_uint};
-use crypto::hash;
-
-#[allow(dead_code)]
-#[allow(non_camel_case_types)]
-#[repr(C)]
-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]
-}
+use libc::{c_int, c_uint};
 
-#[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)]
-#[repr(C)]
-struct ENGINE;
+use crypto::hash;
+use ffi;
 
 pub struct HMAC {
-    ctx: HMAC_CTX,
+    ctx: ffi::HMAC_CTX,
     len: uint,
 }
 
@@ -51,13 +29,13 @@ pub fn HMAC(ht: hash::HashType, key: &[u8]) -> HMAC {
     unsafe {
         let (evp, mdlen) = hash::evpmd(ht);
 
-        let mut ctx : HMAC_CTX = ::std::mem::uninitialized();
+        let mut ctx : ffi::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 _);
+        ffi::HMAC_CTX_init(&mut ctx);
+        ffi::HMAC_Init_ex(&mut ctx,
+                          key.as_ptr(),
+                          key.len() as c_int,
+                          evp, 0 as *const _);
 
         HMAC { ctx: ctx, len: mdlen }
     }
@@ -66,7 +44,7 @@ pub fn HMAC(ht: hash::HashType, key: &[u8]) -> HMAC {
 impl HMAC {
     pub fn update(&mut self, data: &[u8]) {
         unsafe {
-            HMAC_Update(&mut self.ctx, data.as_ptr(), data.len() as c_uint)
+            ffi::HMAC_Update(&mut self.ctx, data.as_ptr(), data.len() as c_uint)
         }
     }
 
@@ -74,7 +52,7 @@ impl HMAC {
         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);
+            ffi::HMAC_Final(&mut self.ctx, res.as_mut_ptr(), &mut outlen);
             assert!(self.len == outlen as uint)
             res
         }
diff --git a/src/crypto/pkcs5.rs b/src/crypto/pkcs5.rs
index b795d84a..ec6e0cef 100644
--- a/src/crypto/pkcs5.rs
+++ b/src/crypto/pkcs5.rs
@@ -1,12 +1,5 @@
 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;
-}
+use ffi;
 
 /// 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> {
@@ -16,7 +9,7 @@ pub fn pbkdf2_hmac_sha1(pass: &str, salt: &[u8], iter: uint, keylen: uint) -> Ve
 
         let mut out = Vec::with_capacity(keylen);
 
-        let r = PKCS5_PBKDF2_HMAC_SHA1(
+        let r = ffi::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,
diff --git a/src/crypto/pkey.rs b/src/crypto/pkey.rs
index 5c4b108f..d95e7738 100644
--- a/src/crypto/pkey.rs
+++ b/src/crypto/pkey.rs
@@ -1,50 +1,11 @@
-use libc::{c_char, c_int, c_uint, c_void};
-use libc;
+use libc::{c_int, c_uint};
 use std::mem;
 use std::ptr;
-use bio::{mod, MemBio};
+use bio::{MemBio};
 use crypto::hash::{HashType, MD5, SHA1, SHA224, SHA256, SHA384, SHA512, RIPEMD160};
-use crypto::symm::{EVP_CIPHER};
+use ffi;
 use ssl::error::{SslError, StreamError};
 
-#[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;
-
-pub type PrivateKeyWriteCallback = extern "C" fn(buf: *mut c_char, size: c_int, rwflag: c_int, user_data: *mut c_void) -> c_int;
-
-#[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 EVP_PKEY_set1_RSA(k: *mut EVP_PKEY, r: *mut RSA) -> c_int;
-
-    fn i2d_RSA_PUBKEY(k: *mut RSA, buf: *const *mut u8) -> c_int;
-    fn d2i_RSA_PUBKEY(k: *const *mut RSA, buf: *const *const u8, len: c_uint) -> *mut RSA;
-    fn i2d_RSAPrivateKey(k: *mut RSA, buf: *const *mut u8) -> c_int;
-    fn d2i_RSAPrivateKey(k: *const *mut RSA, buf: *const *const u8, len: c_uint) -> *mut RSA;
-
-    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;
-
-    fn PEM_write_bio_PrivateKey(bio: *mut bio::ffi::BIO, pkey: *mut EVP_PKEY, cipher: *const EVP_CIPHER,
-                                kstr: *mut c_char, klen: c_int,
-                                callback: *mut c_void,
-                                user_data: *mut c_void) -> c_int;
-}
 
 enum Parts {
     Neither,
@@ -86,7 +47,7 @@ fn openssl_hash_nid(hash: HashType) -> c_int {
 }
 
 pub struct PKey {
-    evp: *mut EVP_PKEY,
+    evp: *mut ffi::EVP_PKEY,
     parts: Parts,
 }
 
@@ -95,15 +56,15 @@ impl PKey {
     pub fn new() -> PKey {
         unsafe {
             PKey {
-                evp: EVP_PKEY_new(),
+                evp: ffi::EVP_PKEY_new(),
                 parts: Neither,
             }
         }
     }
 
-    fn _tostr(&self, f: unsafe extern "C" fn(*mut RSA, *const *mut u8) -> c_int) -> Vec<u8> {
+    fn _tostr(&self, f: unsafe extern "C" fn(*mut ffi::RSA, *const *mut u8) -> c_int) -> Vec<u8> {
         unsafe {
-            let rsa = EVP_PKEY_get1_RSA(self.evp);
+            let rsa = ffi::EVP_PKEY_get1_RSA(self.evp);
             let len = f(rsa, ptr::null());
             if len < 0 as c_int { return vec!(); }
             let mut s = Vec::from_elem(len as uint, 0u8);
@@ -115,17 +76,17 @@ impl PKey {
         }
     }
 
-    fn _fromstr(&mut self, s: &[u8], f: unsafe extern "C" fn(*const *mut RSA, *const *const u8, c_uint) -> *mut RSA) {
+    fn _fromstr(&mut self, s: &[u8], f: unsafe extern "C" fn(*const *mut ffi::RSA, *const *const u8, c_uint) -> *mut ffi::RSA) {
         unsafe {
             let rsa = ptr::null_mut();
             f(&rsa, &s.as_ptr(), s.len() as c_uint);
-            EVP_PKEY_set1_RSA(self.evp, rsa);
+            ffi::EVP_PKEY_set1_RSA(self.evp, rsa);
         }
     }
 
     pub fn gen(&mut self, keysz: uint) {
         unsafe {
-            let rsa = RSA_generate_key(
+            let rsa = ffi::RSA_generate_key(
                 keysz as c_uint,
                 65537u as c_uint,
                 ptr::null(),
@@ -133,7 +94,7 @@ impl PKey {
             );
 
             // XXX: 6 == NID_rsaEncryption
-            EVP_PKEY_assign(
+            ffi::EVP_PKEY_assign(
                 self.evp,
                 6 as c_int,
                 mem::transmute(rsa));
@@ -146,14 +107,14 @@ impl PKey {
      * Returns a serialized form of the public key, suitable for load_pub().
      */
     pub fn save_pub(&self) -> Vec<u8> {
-        self._tostr(i2d_RSA_PUBKEY)
+        self._tostr(ffi::i2d_RSA_PUBKEY)
     }
 
     /**
      * 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_RSA_PUBKEY);
+        self._fromstr(s, ffi::d2i_RSA_PUBKEY);
         self.parts = Public;
     }
 
@@ -162,14 +123,14 @@ impl PKey {
      * load_priv().
      */
     pub fn save_priv(&self) -> Vec<u8> {
-        self._tostr(i2d_RSAPrivateKey)
+        self._tostr(ffi::i2d_RSAPrivateKey)
     }
     /**
      * 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_RSAPrivateKey);
+        self._fromstr(s, ffi::d2i_RSAPrivateKey);
         self.parts = Both;
     }
 
@@ -178,8 +139,8 @@ impl PKey {
     pub fn write_pem(&self, writer: &mut Writer/*, password: Option<String>*/) -> Result<(), SslError> {
         let mut mem_bio = try!(MemBio::new());
         unsafe {
-            try_ssl!(PEM_write_bio_PrivateKey(mem_bio.get_handle(), self.evp, ptr::null(),
-                                              ptr::null_mut(), -1, ptr::null_mut(), ptr::null_mut()));
+            try_ssl!(ffi::PEM_write_bio_PrivateKey(mem_bio.get_handle(), self.evp, ptr::null(),
+                                                   ptr::null_mut(), -1, ptr::null_mut(), ptr::null_mut()));
 
         }
         let buf = try!(mem_bio.read_to_end().map_err(StreamError));
@@ -191,7 +152,7 @@ impl PKey {
      */
     pub fn size(&self) -> uint {
         unsafe {
-            RSA_size(EVP_PKEY_get1_RSA(self.evp)) as uint
+            ffi::RSA_size(ffi::EVP_PKEY_get1_RSA(self.evp)) as uint
         }
     }
 
@@ -229,8 +190,8 @@ impl PKey {
      */
     pub fn max_data(&self) -> uint {
         unsafe {
-            let rsa = EVP_PKEY_get1_RSA(self.evp);
-            let len = RSA_size(rsa);
+            let rsa = ffi::EVP_PKEY_get1_RSA(self.evp);
+            let len = ffi::RSA_size(rsa);
 
             // 41 comes from RSA_public_encrypt(3) for OAEP
             len as uint - 41u
@@ -239,14 +200,14 @@ impl PKey {
 
     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);
+            let rsa = ffi::EVP_PKEY_get1_RSA(self.evp);
+            let len = ffi::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(
+            let rv = ffi::RSA_public_encrypt(
                 s.len() as c_uint,
                 s.as_ptr(),
                 r.as_mut_ptr(),
@@ -264,14 +225,14 @@ impl PKey {
 
     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);
+            let rsa = ffi::EVP_PKEY_get1_RSA(self.evp);
+            let len = ffi::RSA_size(rsa);
 
-            assert_eq!(s.len() as c_uint, RSA_size(rsa));
+            assert_eq!(s.len() as c_uint, ffi::RSA_size(rsa));
 
             let mut r = Vec::from_elem(len as uint + 1u, 0u8);
 
-            let rv = RSA_private_decrypt(
+            let rv = ffi::RSA_private_decrypt(
                 s.len() as c_uint,
                 s.as_ptr(),
                 r.as_mut_ptr(),
@@ -312,11 +273,11 @@ impl PKey {
 
     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 rsa = ffi::EVP_PKEY_get1_RSA(self.evp);
+            let mut len = ffi::RSA_size(rsa);
             let mut r = Vec::from_elem(len as uint + 1u, 0u8);
 
-            let rv = RSA_sign(
+            let rv = ffi::RSA_sign(
                 openssl_hash_nid(hash),
                 s.as_ptr(),
                 s.len() as c_uint,
@@ -335,9 +296,9 @@ impl PKey {
 
     pub fn verify_with_hash(&self, m: &[u8], s: &[u8], hash: HashType) -> bool {
         unsafe {
-            let rsa = EVP_PKEY_get1_RSA(self.evp);
+            let rsa = ffi::EVP_PKEY_get1_RSA(self.evp);
 
-            let rv = RSA_verify(
+            let rv = ffi::RSA_verify(
                 openssl_hash_nid(hash),
                 m.as_ptr(),
                 m.len() as c_uint,
@@ -350,7 +311,7 @@ impl PKey {
         }
     }
 
-    pub unsafe fn get_handle(&self) -> *mut EVP_PKEY {
+    pub unsafe fn get_handle(&self) -> *mut ffi::EVP_PKEY {
         return self.evp
     }
 }
@@ -358,7 +319,7 @@ impl PKey {
 impl Drop for PKey {
     fn drop(&mut self) {
         unsafe {
-            EVP_PKEY_free(self.evp);
+            ffi::EVP_PKEY_free(self.evp);
         }
     }
 }
diff --git a/src/crypto/rand.rs b/src/crypto/rand.rs
index 9db87fcd..dffddee7 100644
--- a/src/crypto/rand.rs
+++ b/src/crypto/rand.rs
@@ -1,15 +1,11 @@
 use libc::c_int;
-
-#[link(name = "crypto")]
-extern {
-    fn RAND_bytes(buf: *mut u8, num: c_int) -> c_int;
-}
+use ffi;
 
 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);
+        let r = ffi::RAND_bytes(out.as_mut_ptr(), len as c_int);
         if r != 1 as c_int { fail!() }
 
         out.set_len(len);
diff --git a/src/crypto/symm.rs b/src/crypto/symm.rs
index 6bba7267..a3664bc0 100644
--- a/src/crypto/symm.rs
+++ b/src/crypto/symm.rs
@@ -1,36 +1,6 @@
-use libc::{c_int, c_uint};
-use libc;
+use libc::{c_int};
 
-#[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);
-}
+use ffi;
 
 pub enum Mode {
     Encrypt,
@@ -52,35 +22,35 @@ pub enum Type {
     RC4_128,
 }
 
-fn evpc(t: Type) -> (EVP_CIPHER, uint, uint) {
+fn evpc(t: Type) -> (ffi::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_ECB => (ffi::EVP_aes_128_ecb(), 16u, 16u),
+            AES_128_CBC => (ffi::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_ECB => (ffi::EVP_aes_256_ecb(), 32u, 16u),
+            AES_256_CBC => (ffi::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),
+            RC4_128 => (ffi::EVP_rc4(), 16u, 0u),
         }
     }
 }
 
 /// Represents a symmetric cipher context.
 pub struct Crypter {
-    evp: EVP_CIPHER,
-    ctx: EVP_CIPHER_CTX,
+    evp: ffi::EVP_CIPHER,
+    ctx: ffi::EVP_CIPHER_CTX,
     keylen: uint,
     blocksize: uint
 }
 
 impl Crypter {
     pub fn new(t: Type) -> Crypter {
-        let ctx = unsafe { EVP_CIPHER_CTX_new() };
+        let ctx = unsafe { ffi::EVP_CIPHER_CTX_new() };
         let (evp, keylen, blocksz) = evpc(t);
         Crypter { evp: evp, ctx: ctx, keylen: keylen, blocksize: blocksz }
     }
@@ -93,7 +63,7 @@ impl Crypter {
         if self.blocksize > 0 {
             unsafe {
                 let v = if padding { 1 as c_int } else { 0 };
-                EVP_CIPHER_CTX_set_padding(self.ctx, v);
+                ffi::EVP_CIPHER_CTX_set_padding(self.ctx, v);
             }
         }
     }
@@ -109,7 +79,7 @@ impl Crypter {
             };
             assert_eq!(key.len(), self.keylen);
 
-            EVP_CipherInit(
+            ffi::EVP_CipherInit(
                 self.ctx,
                 self.evp,
                 key.as_ptr(),
@@ -128,7 +98,7 @@ impl Crypter {
             let mut res = Vec::from_elem(data.len() + self.blocksize, 0u8);
             let mut reslen = (data.len() + self.blocksize) as u32;
 
-            EVP_CipherUpdate(
+            ffi::EVP_CipherUpdate(
                 self.ctx,
                 res.as_mut_ptr(),
                 &mut reslen,
@@ -149,7 +119,7 @@ impl Crypter {
             let mut res = Vec::from_elem(self.blocksize, 0u8);
             let mut reslen = self.blocksize as c_int;
 
-            EVP_CipherFinal(self.ctx,
+            ffi::EVP_CipherFinal(self.ctx,
                                        res.as_mut_ptr(),
                                        &mut reslen);
 
@@ -162,7 +132,7 @@ impl Crypter {
 impl Drop for Crypter {
     fn drop(&mut self) {
         unsafe {
-            EVP_CIPHER_CTX_free(self.ctx);
+            ffi::EVP_CIPHER_CTX_free(self.ctx);
         }
     }
 }