diff options
Diffstat (limited to 'crypto/aes/aes_cbc.c')
| -rw-r--r-- | crypto/aes/aes_cbc.c | 133 |
1 files changed, 67 insertions, 66 deletions
diff --git a/crypto/aes/aes_cbc.c b/crypto/aes/aes_cbc.c index 373864cd4b..dff5cd8df9 100644 --- a/crypto/aes/aes_cbc.c +++ b/crypto/aes/aes_cbc.c @@ -7,7 +7,7 @@ * are met: * * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. + * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in @@ -61,73 +61,74 @@ #if !defined(OPENSSL_FIPS_AES_ASM) void AES_cbc_encrypt(const unsigned char *in, unsigned char *out, - const unsigned long length, const AES_KEY *key, - unsigned char *ivec, const int enc) { + const unsigned long length, const AES_KEY *key, + unsigned char *ivec, const int enc) +{ - unsigned long n; - unsigned long len = length; - unsigned char tmp[AES_BLOCK_SIZE]; - const unsigned char *iv = ivec; + unsigned long n; + unsigned long len = length; + unsigned char tmp[AES_BLOCK_SIZE]; + const unsigned char *iv = ivec; - assert(in && out && key && ivec); - assert((AES_ENCRYPT == enc)||(AES_DECRYPT == enc)); + assert(in && out && key && ivec); + assert((AES_ENCRYPT == enc) || (AES_DECRYPT == enc)); - if (AES_ENCRYPT == enc) { - while (len >= AES_BLOCK_SIZE) { - for(n=0; n < AES_BLOCK_SIZE; ++n) - out[n] = in[n] ^ iv[n]; - AES_encrypt(out, out, key); - iv = out; - len -= AES_BLOCK_SIZE; - in += AES_BLOCK_SIZE; - out += AES_BLOCK_SIZE; - } - if (len) { - for(n=0; n < len; ++n) - out[n] = in[n] ^ iv[n]; - for(n=len; n < AES_BLOCK_SIZE; ++n) - out[n] = iv[n]; - AES_encrypt(out, out, key); - iv = out; - } - memcpy(ivec,iv,AES_BLOCK_SIZE); - } else if (in != out) { - while (len >= AES_BLOCK_SIZE) { - AES_decrypt(in, out, key); - for(n=0; n < AES_BLOCK_SIZE; ++n) - out[n] ^= iv[n]; - iv = in; - len -= AES_BLOCK_SIZE; - in += AES_BLOCK_SIZE; - out += AES_BLOCK_SIZE; - } - if (len) { - AES_decrypt(in,tmp,key); - for(n=0; n < len; ++n) - out[n] = tmp[n] ^ iv[n]; - iv = in; - } - memcpy(ivec,iv,AES_BLOCK_SIZE); - } else { - while (len >= AES_BLOCK_SIZE) { - memcpy(tmp, in, AES_BLOCK_SIZE); - AES_decrypt(in, out, key); - for(n=0; n < AES_BLOCK_SIZE; ++n) - out[n] ^= ivec[n]; - memcpy(ivec, tmp, AES_BLOCK_SIZE); - len -= AES_BLOCK_SIZE; - in += AES_BLOCK_SIZE; - out += AES_BLOCK_SIZE; - } - if (len) { - memcpy(tmp, in, AES_BLOCK_SIZE); - AES_decrypt(tmp, out, key); - for(n=0; n < len; ++n) - out[n] ^= ivec[n]; - for(n=len; n < AES_BLOCK_SIZE; ++n) - out[n] = tmp[n]; - memcpy(ivec, tmp, AES_BLOCK_SIZE); - } - } + if (AES_ENCRYPT == enc) { + while (len >= AES_BLOCK_SIZE) { + for (n = 0; n < AES_BLOCK_SIZE; ++n) + out[n] = in[n] ^ iv[n]; + AES_encrypt(out, out, key); + iv = out; + len -= AES_BLOCK_SIZE; + in += AES_BLOCK_SIZE; + out += AES_BLOCK_SIZE; + } + if (len) { + for (n = 0; n < len; ++n) + out[n] = in[n] ^ iv[n]; + for (n = len; n < AES_BLOCK_SIZE; ++n) + out[n] = iv[n]; + AES_encrypt(out, out, key); + iv = out; + } + memcpy(ivec, iv, AES_BLOCK_SIZE); + } else if (in != out) { + while (len >= AES_BLOCK_SIZE) { + AES_decrypt(in, out, key); + for (n = 0; n < AES_BLOCK_SIZE; ++n) + out[n] ^= iv[n]; + iv = in; + len -= AES_BLOCK_SIZE; + in += AES_BLOCK_SIZE; + out += AES_BLOCK_SIZE; + } + if (len) { + AES_decrypt(in, tmp, key); + for (n = 0; n < len; ++n) + out[n] = tmp[n] ^ iv[n]; + iv = in; + } + memcpy(ivec, iv, AES_BLOCK_SIZE); + } else { + while (len >= AES_BLOCK_SIZE) { + memcpy(tmp, in, AES_BLOCK_SIZE); + AES_decrypt(in, out, key); + for (n = 0; n < AES_BLOCK_SIZE; ++n) + out[n] ^= ivec[n]; + memcpy(ivec, tmp, AES_BLOCK_SIZE); + len -= AES_BLOCK_SIZE; + in += AES_BLOCK_SIZE; + out += AES_BLOCK_SIZE; + } + if (len) { + memcpy(tmp, in, AES_BLOCK_SIZE); + AES_decrypt(tmp, out, key); + for (n = 0; n < len; ++n) + out[n] ^= ivec[n]; + for (n = len; n < AES_BLOCK_SIZE; ++n) + out[n] = tmp[n]; + memcpy(ivec, tmp, AES_BLOCK_SIZE); + } + } } #endif |