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Diffstat (limited to 'src/crypto/modes/cbc.c')
| -rw-r--r-- | src/crypto/modes/cbc.c | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/src/crypto/modes/cbc.c b/src/crypto/modes/cbc.c new file mode 100644 index 0000000..a2ad26c --- /dev/null +++ b/src/crypto/modes/cbc.c @@ -0,0 +1,203 @@ +/* ==================================================================== + * Copyright (c) 2008 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 <openssl/modes.h> + +#include <assert.h> +#include <string.h> + +#include "internal.h" + + +#ifndef STRICT_ALIGNMENT +# define STRICT_ALIGNMENT 0 +#endif + +void CRYPTO_cbc128_encrypt(const uint8_t *in, uint8_t *out, size_t len, + const void *key, uint8_t ivec[16], + block128_f block) { + size_t n; + const uint8_t *iv = ivec; + + assert(in && out && key && ivec); + + if (STRICT_ALIGNMENT && + ((size_t)in | (size_t)out | (size_t)ivec) % sizeof(size_t) != 0) { + while (len >= 16) { + for (n = 0; n < 16; ++n) { + out[n] = in[n] ^ iv[n]; + } + (*block)(out, out, key); + iv = out; + len -= 16; + in += 16; + out += 16; + } + } else { + while (len >= 16) { + for (n = 0; n < 16; n += sizeof(size_t)) { + *(size_t *)(out + n) = *(size_t *)(in + n) ^ *(size_t *)(iv + n); + } + (*block)(out, out, key); + iv = out; + len -= 16; + in += 16; + out += 16; + } + } + + while (len) { + for (n = 0; n < 16 && n < len; ++n) { + out[n] = in[n] ^ iv[n]; + } + for (; n < 16; ++n) { + out[n] = iv[n]; + } + (*block)(out, out, key); + iv = out; + if (len <= 16) { + break; + } + len -= 16; + in += 16; + out += 16; + } + + memcpy(ivec, iv, 16); +} + +void CRYPTO_cbc128_decrypt(const uint8_t *in, uint8_t *out, size_t len, + const void *key, uint8_t ivec[16], + block128_f block) { + size_t n; + union { + size_t t[16 / sizeof(size_t)]; + uint8_t c[16]; + } tmp; + + assert(in && out && key && ivec); + + if (in != out) { + const uint8_t *iv = ivec; + + if (STRICT_ALIGNMENT && + ((size_t)in | (size_t)out | (size_t)ivec) % sizeof(size_t) != 0) { + while (len >= 16) { + (*block)(in, out, key); + for (n = 0; n < 16; ++n) + out[n] ^= iv[n]; + iv = in; + len -= 16; + in += 16; + out += 16; + } + } else if (16 % sizeof(size_t) == 0) { /* always true */ + while (len >= 16) { + size_t *out_t = (size_t *)out, *iv_t = (size_t *)iv; + + (*block)(in, out, key); + for (n = 0; n < 16 / sizeof(size_t); n++) + out_t[n] ^= iv_t[n]; + iv = in; + len -= 16; + in += 16; + out += 16; + } + } + memcpy(ivec, iv, 16); + } else { + if (STRICT_ALIGNMENT && + ((size_t)in | (size_t)out | (size_t)ivec) % sizeof(size_t) != 0) { + uint8_t c; + while (len >= 16) { + (*block)(in, tmp.c, key); + for (n = 0; n < 16; ++n) { + c = in[n]; + out[n] = tmp.c[n] ^ ivec[n]; + ivec[n] = c; + } + len -= 16; + in += 16; + out += 16; + } + } else if (16 % sizeof(size_t) == 0) { /* always true */ + while (len >= 16) { + size_t c, *out_t = (size_t *)out, *ivec_t = (size_t *)ivec; + const size_t *in_t = (const size_t *)in; + + (*block)(in, tmp.c, key); + for (n = 0; n < 16 / sizeof(size_t); n++) { + c = in_t[n]; + out_t[n] = tmp.t[n] ^ ivec_t[n]; + ivec_t[n] = c; + } + len -= 16; + in += 16; + out += 16; + } + } + } + + while (len) { + uint8_t c; + (*block)(in, tmp.c, key); + for (n = 0; n < 16 && n < len; ++n) { + c = in[n]; + out[n] = tmp.c[n] ^ ivec[n]; + ivec[n] = c; + } + if (len <= 16) { + for (; n < 16; ++n) { + ivec[n] = in[n]; + } + break; + } + len -= 16; + in += 16; + out += 16; + } +} |