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Diffstat (limited to 'openssl/crypto/aes/aes_cbc.c')
| -rw-r--r-- | openssl/crypto/aes/aes_cbc.c | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/openssl/crypto/aes/aes_cbc.c b/openssl/crypto/aes/aes_cbc.c new file mode 100644 index 000000000..373864cd4 --- /dev/null +++ b/openssl/crypto/aes/aes_cbc.c @@ -0,0 +1,133 @@ +/* crypto/aes/aes_cbc.c -*- mode:C; c-file-style: "eay" -*- */ +/* ==================================================================== + * Copyright (c) 1998-2002 The OpenSSL Project. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * 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 + * the documentation and/or other materials provided with the + * distribution. + * + * 3. All advertising materials mentioning features or use of this + * software must display the following acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" + * + * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to + * endorse or promote products derived from this software without + * prior written permission. For written permission, please contact + * openssl-core@openssl.org. + * + * 5. Products derived from this software may not be called "OpenSSL" + * nor may "OpenSSL" appear in their names without prior written + * permission of the OpenSSL Project. + * + * 6. Redistributions of any form whatsoever must retain the following + * acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit (http://www.openssl.org/)" + * + * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY + * EXPRESSED 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 OpenSSL PROJECT OR + * ITS 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. + * ==================================================================== + * + */ + +#ifndef AES_DEBUG +# ifndef NDEBUG +# define NDEBUG +# endif +#endif +#include <assert.h> + +#include <openssl/aes.h> +#include "aes_locl.h" + +#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) { + + 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)); + + 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 |