297 lines
9.1 KiB
Rust
297 lines
9.1 KiB
Rust
use std::libc::c_int;
|
|
use std::libc;
|
|
use std::vec;
|
|
|
|
#[allow(non_camel_case_types)]
|
|
pub type EVP_CIPHER_CTX = *libc::c_void;
|
|
|
|
#[allow(non_camel_case_types)]
|
|
pub type EVP_CIPHER = *libc::c_void;
|
|
|
|
mod libcrypto {
|
|
use super::*;
|
|
use std::libc::{c_int, c_uint};
|
|
|
|
extern {
|
|
#[link_args = "-lcrypto"]
|
|
pub fn EVP_CIPHER_CTX_new() -> EVP_CIPHER_CTX;
|
|
pub fn EVP_CIPHER_CTX_set_padding(ctx: EVP_CIPHER_CTX, padding: c_int);
|
|
pub fn EVP_CIPHER_CTX_free(ctx: EVP_CIPHER_CTX);
|
|
|
|
pub fn EVP_aes_128_ecb() -> EVP_CIPHER;
|
|
pub fn EVP_aes_128_cbc() -> EVP_CIPHER;
|
|
// pub fn EVP_aes_128_ctr() -> EVP_CIPHER;
|
|
// pub fn EVP_aes_128_gcm() -> EVP_CIPHER;
|
|
|
|
pub fn EVP_aes_256_ecb() -> EVP_CIPHER;
|
|
pub fn EVP_aes_256_cbc() -> EVP_CIPHER;
|
|
// pub fn EVP_aes_256_ctr() -> EVP_CIPHER;
|
|
// pub fn EVP_aes_256_gcm() -> EVP_CIPHER;
|
|
|
|
pub fn EVP_rc4() -> EVP_CIPHER;
|
|
|
|
pub fn EVP_CipherInit(ctx: EVP_CIPHER_CTX, evp: EVP_CIPHER,
|
|
key: *u8, iv: *u8, mode: c_int);
|
|
pub fn EVP_CipherUpdate(ctx: EVP_CIPHER_CTX, outbuf: *mut u8,
|
|
outlen: &mut c_uint, inbuf: *u8, inlen: c_int);
|
|
pub 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 => (libcrypto::EVP_aes_128_ecb(), 16u, 16u),
|
|
AES_128_CBC => (libcrypto::EVP_aes_128_cbc(), 16u, 16u),
|
|
// AES_128_CTR => (libcrypto::EVP_aes_128_ctr(), 16u, 0u),
|
|
//AES_128_GCM => (libcrypto::EVP_aes_128_gcm(), 16u, 16u),
|
|
|
|
AES_256_ECB => (libcrypto::EVP_aes_256_ecb(), 32u, 16u),
|
|
AES_256_CBC => (libcrypto::EVP_aes_256_cbc(), 32u, 16u),
|
|
// AES_256_CTR => (libcrypto::EVP_aes_256_ctr(), 32u, 0u),
|
|
//AES_256_GCM => (libcrypto::EVP_aes_256_gcm(), 32u, 16u),
|
|
|
|
RC4_128 => (libcrypto::EVP_rc4(), 16u, 0u),
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Represents a symmetric cipher context.
|
|
pub struct Crypter {
|
|
priv evp: EVP_CIPHER,
|
|
priv ctx: EVP_CIPHER_CTX,
|
|
priv keylen: uint,
|
|
priv blocksize: uint
|
|
}
|
|
|
|
impl Crypter {
|
|
pub fn new(t: Type) -> Crypter {
|
|
let ctx = unsafe { libcrypto::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;
|
|
libcrypto::EVP_CIPHER_CTX_set_padding(self.ctx, v);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Initializes this crypter.
|
|
*/
|
|
pub fn init(&self, mode: Mode, key: &[u8], iv: &[u8]) {
|
|
unsafe {
|
|
let mode = match mode {
|
|
Encrypt => 1 as c_int,
|
|
Decrypt => 0 as c_int,
|
|
};
|
|
assert_eq!(key.len(), self.keylen);
|
|
|
|
do key.as_imm_buf |pkey, _len| {
|
|
do iv.as_imm_buf |piv, _len| {
|
|
libcrypto::EVP_CipherInit(
|
|
self.ctx,
|
|
self.evp,
|
|
pkey,
|
|
piv,
|
|
mode
|
|
)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Update this crypter with more data to encrypt or decrypt. Returns
|
|
* encrypted or decrypted bytes.
|
|
*/
|
|
pub fn update(&self, data: &[u8]) -> ~[u8] {
|
|
unsafe {
|
|
do data.as_imm_buf |pdata, len| {
|
|
let mut res = vec::from_elem(len + self.blocksize, 0u8);
|
|
|
|
let reslen = do res.as_mut_buf |pres, _len| {
|
|
let mut reslen = (len + self.blocksize) as u32;
|
|
|
|
libcrypto::EVP_CipherUpdate(
|
|
self.ctx,
|
|
pres,
|
|
&mut reslen,
|
|
pdata,
|
|
len as c_int
|
|
);
|
|
|
|
reslen
|
|
};
|
|
|
|
res.truncate(reslen as uint);
|
|
res
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Finish crypting. Returns the remaining partial block of output, if any.
|
|
*/
|
|
pub fn final(&self) -> ~[u8] {
|
|
unsafe {
|
|
let mut res = vec::from_elem(self.blocksize, 0u8);
|
|
|
|
let reslen = do res.as_mut_buf |pres, _len| {
|
|
let mut reslen = self.blocksize as c_int;
|
|
libcrypto::EVP_CipherFinal(self.ctx, pres, &mut reslen);
|
|
reslen
|
|
};
|
|
|
|
res.truncate(reslen as uint);
|
|
res
|
|
}
|
|
}
|
|
}
|
|
|
|
impl Drop for Crypter {
|
|
fn drop(&mut self) {
|
|
unsafe {
|
|
libcrypto::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: ~[u8], data: &[u8]) -> ~[u8] {
|
|
let c = Crypter::new(t);
|
|
c.init(Encrypt, key, iv);
|
|
let r = c.update(data);
|
|
let rest = c.final();
|
|
r + rest
|
|
}
|
|
|
|
/**
|
|
* 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: ~[u8], data: &[u8]) -> ~[u8] {
|
|
let c = Crypter::new(t);
|
|
c.init(Decrypt, key, iv);
|
|
let r = c.update(data);
|
|
let rest = c.final();
|
|
r + rest
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::*;
|
|
|
|
use 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 =
|
|
~[ 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 =
|
|
~[ 0x00u8, 0x11u8, 0x22u8, 0x33u8, 0x44u8, 0x55u8, 0x66u8, 0x77u8,
|
|
0x88u8, 0x99u8, 0xaau8, 0xbbu8, 0xccu8, 0xddu8, 0xeeu8, 0xffu8 ];
|
|
let c0 =
|
|
~[ 0x8eu8, 0xa2u8, 0xb7u8, 0xcau8, 0x51u8, 0x67u8, 0x45u8, 0xbfu8,
|
|
0xeau8, 0xfcu8, 0x49u8, 0x90u8, 0x4bu8, 0x49u8, 0x60u8, 0x89u8 ];
|
|
let c = Crypter::new(AES_256_ECB);
|
|
c.init(Encrypt, k0, []);
|
|
c.pad(false);
|
|
let r0 = c.update(p0) + c.final();
|
|
assert!(r0 == c0);
|
|
c.init(Decrypt, k0, []);
|
|
c.pad(false);
|
|
let p1 = c.update(r0) + c.final();
|
|
assert!(p1 == p0);
|
|
}
|
|
|
|
fn cipher_test(ciphertype: Type, pt: ~str, ct: ~str, key: ~str, iv: ~str) {
|
|
use hex::ToHex;
|
|
|
|
let cipher = Crypter::new(ciphertype);
|
|
cipher.init(Encrypt, key.from_hex(), iv.from_hex());
|
|
|
|
let expected = ct.from_hex();
|
|
let computed = cipher.update(pt.from_hex()) + cipher.final();
|
|
|
|
if computed != expected {
|
|
println!("Computed: {}", computed.to_hex());
|
|
println!("Expected: {}", expected.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(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(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(AES_128_GCM, pt, ct, key, iv);
|
|
}*/
|
|
}
|