diff options
Diffstat (limited to 'crypto/aes/aes_cbc.c')
-rw-r--r-- | crypto/aes/aes_cbc.c | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/crypto/aes/aes_cbc.c b/crypto/aes/aes_cbc.c new file mode 100644 index 0000000000..964a9780e4 --- /dev/null +++ b/crypto/aes/aes_cbc.c @@ -0,0 +1,89 @@ +/* crypto/aes/aes_cbc.c -*- mode:C; c-file-style: "eay" -*- */ +/* ==================================================================== + * Copyright (c) 1998-2001 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. + * ==================================================================== + * + */ + +#include <assert.h> +#include <openssl/aes.h> +#include "aes_locl.h" + +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) { + + int n; + unsigned long len = length; + unsigned char tmp[16]; + + assert(in && out && key && ivec); + assert(length % AES_BLOCK_SIZE == 0); + assert((AES_ENCRYPT == enc)||(AES_DECRYPT == enc)); + + if (AES_ENCRYPT == enc) + while (len > 0) { + for(n=0; n < 16; ++n) + tmp[n] = in[n] ^ ivec[n]; + AES_encrypt(tmp, out, key); + memcpy(ivec, out, 16); + len -= 16; + in += 16; + out += 16; + } + else + while (len > 0) { + memcpy(tmp, in, 16); + AES_decrypt(in, out, key); + for(n=0; n < 16; ++n) + out[n] ^= ivec[n]; + memcpy(ivec, tmp, 16); + len -= 16; + in += 16; + out += 16; + } +} |