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crypt.c
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349 lines (323 loc) · 10.4 KB
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/* Copyright (c) 2009, 2010 Simon Josefsson <simon@josefsson.org>
* Copyright (c) 2004-2007, Sara Golemon <sarag@libssh2.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms,
* with or without modification, are permitted provided
* that the following conditions are met:
*
* Redistributions of source code must retain the above
* copyright notice, this list of conditions and the
* following disclaimer.
*
* Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* Neither the name of the copyright holder nor the names
* of any other contributors may be used to endorse or
* promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*/
#include "libssh2_priv.h"
#ifdef LIBSSH2_CRYPT_NONE
/* crypt_none_crypt
* Minimalist cipher: VERY secure *wink*
*/
static int
crypt_none_crypt(LIBSSH2_SESSION * session, unsigned char *buf,
void **abstract)
{
/* Do nothing to the data! */
return 0;
}
static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_none = {
"none",
"DEK-Info: NONE",
8, /* blocksize (SSH2 defines minimum blocksize as 8) */
0, /* iv_len */
0, /* secret_len */
0, /* flags */
NULL,
crypt_none_crypt,
NULL
};
#endif /* LIBSSH2_CRYPT_NONE */
struct crypt_ctx
{
int encrypt;
_libssh2_cipher_type(algo);
_libssh2_cipher_ctx h;
};
static int
crypt_init(LIBSSH2_SESSION * session,
const LIBSSH2_CRYPT_METHOD * method,
unsigned char *iv, int *free_iv,
unsigned char *secret, int *free_secret,
int encrypt, void **abstract)
{
struct crypt_ctx *ctx = LIBSSH2_ALLOC(session,
sizeof(struct crypt_ctx));
if(!ctx)
return LIBSSH2_ERROR_ALLOC;
ctx->encrypt = encrypt;
ctx->algo = method->algo;
if(_libssh2_cipher_init(&ctx->h, ctx->algo, iv, secret, encrypt)) {
LIBSSH2_FREE(session, ctx);
return -1;
}
*abstract = ctx;
*free_iv = 1;
*free_secret = 1;
return 0;
}
static int
crypt_encrypt(LIBSSH2_SESSION * session, unsigned char *block,
size_t blocksize, void **abstract)
{
struct crypt_ctx *cctx = *(struct crypt_ctx **) abstract;
(void) session;
return _libssh2_cipher_crypt(&cctx->h, cctx->algo, cctx->encrypt, block,
blocksize);
}
static int
crypt_dtor(LIBSSH2_SESSION * session, void **abstract)
{
struct crypt_ctx **cctx = (struct crypt_ctx **) abstract;
if(cctx && *cctx) {
_libssh2_cipher_dtor(&(*cctx)->h);
LIBSSH2_FREE(session, *cctx);
*abstract = NULL;
}
return 0;
}
#if LIBSSH2_AES_CTR
static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_aes128_ctr = {
"aes128-ctr",
"",
16, /* blocksize */
16, /* initial value length */
16, /* secret length -- 16*8 == 128bit */
0, /* flags */
&crypt_init,
&crypt_encrypt,
&crypt_dtor,
_libssh2_cipher_aes128ctr
};
static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_aes192_ctr = {
"aes192-ctr",
"",
16, /* blocksize */
16, /* initial value length */
24, /* secret length -- 24*8 == 192bit */
0, /* flags */
&crypt_init,
&crypt_encrypt,
&crypt_dtor,
_libssh2_cipher_aes192ctr
};
static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_aes256_ctr = {
"aes256-ctr",
"",
16, /* blocksize */
16, /* initial value length */
32, /* secret length -- 32*8 == 256bit */
0, /* flags */
&crypt_init,
&crypt_encrypt,
&crypt_dtor,
_libssh2_cipher_aes256ctr
};
#endif
#if LIBSSH2_AES
static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_aes128_cbc = {
"aes128-cbc",
"DEK-Info: AES-128-CBC",
16, /* blocksize */
16, /* initial value length */
16, /* secret length -- 16*8 == 128bit */
0, /* flags */
&crypt_init,
&crypt_encrypt,
&crypt_dtor,
_libssh2_cipher_aes128
};
static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_aes192_cbc = {
"aes192-cbc",
"DEK-Info: AES-192-CBC",
16, /* blocksize */
16, /* initial value length */
24, /* secret length -- 24*8 == 192bit */
0, /* flags */
&crypt_init,
&crypt_encrypt,
&crypt_dtor,
_libssh2_cipher_aes192
};
static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_aes256_cbc = {
"aes256-cbc",
"DEK-Info: AES-256-CBC",
16, /* blocksize */
16, /* initial value length */
32, /* secret length -- 32*8 == 256bit */
0, /* flags */
&crypt_init,
&crypt_encrypt,
&crypt_dtor,
_libssh2_cipher_aes256
};
/* rijndael-cbc@lysator.liu.se == aes256-cbc */
static const LIBSSH2_CRYPT_METHOD
libssh2_crypt_method_rijndael_cbc_lysator_liu_se = {
"rijndael-cbc@lysator.liu.se",
"DEK-Info: AES-256-CBC",
16, /* blocksize */
16, /* initial value length */
32, /* secret length -- 32*8 == 256bit */
0, /* flags */
&crypt_init,
&crypt_encrypt,
&crypt_dtor,
_libssh2_cipher_aes256
};
#endif /* LIBSSH2_AES */
#if LIBSSH2_BLOWFISH
static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_blowfish_cbc = {
"blowfish-cbc",
"",
8, /* blocksize */
8, /* initial value length */
16, /* secret length */
0, /* flags */
&crypt_init,
&crypt_encrypt,
&crypt_dtor,
_libssh2_cipher_blowfish
};
#endif /* LIBSSH2_BLOWFISH */
#if LIBSSH2_RC4
static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_arcfour = {
"arcfour",
"DEK-Info: RC4",
8, /* blocksize */
8, /* initial value length */
16, /* secret length */
0, /* flags */
&crypt_init,
&crypt_encrypt,
&crypt_dtor,
_libssh2_cipher_arcfour
};
static int
crypt_init_arcfour128(LIBSSH2_SESSION * session,
const LIBSSH2_CRYPT_METHOD * method,
unsigned char *iv, int *free_iv,
unsigned char *secret, int *free_secret,
int encrypt, void **abstract)
{
int rc;
rc = crypt_init(session, method, iv, free_iv, secret, free_secret,
encrypt, abstract);
if(rc == 0) {
struct crypt_ctx *cctx = *(struct crypt_ctx **) abstract;
unsigned char block[8];
size_t discard = 1536;
for(; discard; discard -= 8)
_libssh2_cipher_crypt(&cctx->h, cctx->algo, cctx->encrypt, block,
method->blocksize);
}
return rc;
}
static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_arcfour128 = {
"arcfour128",
"",
8, /* blocksize */
8, /* initial value length */
16, /* secret length */
0, /* flags */
&crypt_init_arcfour128,
&crypt_encrypt,
&crypt_dtor,
_libssh2_cipher_arcfour
};
#endif /* LIBSSH2_RC4 */
#if LIBSSH2_CAST
static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_cast128_cbc = {
"cast128-cbc",
"",
8, /* blocksize */
8, /* initial value length */
16, /* secret length */
0, /* flags */
&crypt_init,
&crypt_encrypt,
&crypt_dtor,
_libssh2_cipher_cast5
};
#endif /* LIBSSH2_CAST */
#if LIBSSH2_3DES
static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_3des_cbc = {
"3des-cbc",
"DEK-Info: DES-EDE3-CBC",
8, /* blocksize */
8, /* initial value length */
24, /* secret length */
0, /* flags */
&crypt_init,
&crypt_encrypt,
&crypt_dtor,
_libssh2_cipher_3des
};
#endif
static const LIBSSH2_CRYPT_METHOD *_libssh2_crypt_methods[] = {
#if LIBSSH2_AES_CTR
&libssh2_crypt_method_aes128_ctr,
&libssh2_crypt_method_aes192_ctr,
&libssh2_crypt_method_aes256_ctr,
#endif /* LIBSSH2_AES */
#if LIBSSH2_AES
&libssh2_crypt_method_aes256_cbc,
&libssh2_crypt_method_rijndael_cbc_lysator_liu_se, /* == aes256-cbc */
&libssh2_crypt_method_aes192_cbc,
&libssh2_crypt_method_aes128_cbc,
#endif /* LIBSSH2_AES */
#if LIBSSH2_BLOWFISH
&libssh2_crypt_method_blowfish_cbc,
#endif /* LIBSSH2_BLOWFISH */
#if LIBSSH2_RC4
&libssh2_crypt_method_arcfour128,
&libssh2_crypt_method_arcfour,
#endif /* LIBSSH2_RC4 */
#if LIBSSH2_CAST
&libssh2_crypt_method_cast128_cbc,
#endif /* LIBSSH2_CAST */
#if LIBSSH2_3DES
&libssh2_crypt_method_3des_cbc,
#endif /* LIBSSH2_DES */
#ifdef LIBSSH2_CRYPT_NONE
&libssh2_crypt_method_none,
#endif
NULL
};
/* Expose to kex.c */
const LIBSSH2_CRYPT_METHOD **
libssh2_crypt_methods(void)
{
return _libssh2_crypt_methods;
}