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207 lines
6.7 KiB
207 lines
6.7 KiB
/* ==================================================================== |
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* Copyright (c) 2008 The OpenSSL Project. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* |
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* 3. All advertising materials mentioning features or use of this |
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* software must display the following acknowledgment: |
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* "This product includes software developed by the OpenSSL Project |
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)" |
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* |
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
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* endorse or promote products derived from this software without |
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* prior written permission. For written permission, please contact |
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* openssl-core@openssl.org. |
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* |
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* 5. Products derived from this software may not be called "OpenSSL" |
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* nor may "OpenSSL" appear in their names without prior written |
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* permission of the OpenSSL Project. |
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* |
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* 6. Redistributions of any form whatsoever must retain the following |
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* acknowledgment: |
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* "This product includes software developed by the OpenSSL Project |
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)" |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY |
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR |
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
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* OF THE POSSIBILITY OF SUCH DAMAGE. |
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* ==================================================================== |
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* |
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*/ |
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#include <openssl/crypto.h> |
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#include "modes_lcl.h" |
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#include <string.h> |
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#ifndef MODES_DEBUG |
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# ifndef NDEBUG |
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# define NDEBUG |
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# endif |
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#endif |
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#include <assert.h> |
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#ifndef STRICT_ALIGNMENT |
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# define STRICT_ALIGNMENT 0 |
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#endif |
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void CRYPTO_cbc128_encrypt(const unsigned char *in, unsigned char *out, |
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size_t len, const void *key, |
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unsigned char ivec[16], block128_f block) |
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{ |
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size_t n; |
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const unsigned char *iv = ivec; |
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assert(in && out && key && ivec); |
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#if !defined(OPENSSL_SMALL_FOOTPRINT) |
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if (STRICT_ALIGNMENT && |
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((size_t)in | (size_t)out | (size_t)ivec) % sizeof(size_t) != 0) { |
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while (len >= 16) { |
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for (n = 0; n < 16; ++n) |
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out[n] = in[n] ^ iv[n]; |
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(*block) (out, out, key); |
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iv = out; |
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len -= 16; |
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in += 16; |
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out += 16; |
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} |
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} else { |
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while (len >= 16) { |
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for (n = 0; n < 16; n += sizeof(size_t)) |
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*(size_t *)(out + n) = |
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*(size_t *)(in + n) ^ *(size_t *)(iv + n); |
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(*block) (out, out, key); |
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iv = out; |
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len -= 16; |
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in += 16; |
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out += 16; |
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} |
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} |
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#endif |
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while (len) { |
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for (n = 0; n < 16 && n < len; ++n) |
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out[n] = in[n] ^ iv[n]; |
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for (; n < 16; ++n) |
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out[n] = iv[n]; |
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(*block) (out, out, key); |
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iv = out; |
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if (len <= 16) |
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break; |
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len -= 16; |
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in += 16; |
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out += 16; |
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} |
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memcpy(ivec, iv, 16); |
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} |
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void CRYPTO_cbc128_decrypt(const unsigned char *in, unsigned char *out, |
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size_t len, const void *key, |
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unsigned char ivec[16], block128_f block) |
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{ |
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size_t n; |
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union { |
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size_t t[16 / sizeof(size_t)]; |
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unsigned char c[16]; |
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} tmp; |
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assert(in && out && key && ivec); |
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#if !defined(OPENSSL_SMALL_FOOTPRINT) |
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if (in != out) { |
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const unsigned char *iv = ivec; |
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if (STRICT_ALIGNMENT && |
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((size_t)in | (size_t)out | (size_t)ivec) % sizeof(size_t) != 0) { |
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while (len >= 16) { |
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(*block) (in, out, key); |
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for (n = 0; n < 16; ++n) |
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out[n] ^= iv[n]; |
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iv = in; |
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len -= 16; |
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in += 16; |
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out += 16; |
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} |
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} else if (16 % sizeof(size_t) == 0) { /* always true */ |
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while (len >= 16) { |
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size_t *out_t = (size_t *)out, *iv_t = (size_t *)iv; |
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(*block) (in, out, key); |
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for (n = 0; n < 16 / sizeof(size_t); n++) |
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out_t[n] ^= iv_t[n]; |
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iv = in; |
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len -= 16; |
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in += 16; |
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out += 16; |
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} |
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} |
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memcpy(ivec, iv, 16); |
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} else { |
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if (STRICT_ALIGNMENT && |
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((size_t)in | (size_t)out | (size_t)ivec) % sizeof(size_t) != 0) { |
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unsigned char c; |
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while (len >= 16) { |
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(*block) (in, tmp.c, key); |
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for (n = 0; n < 16; ++n) { |
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c = in[n]; |
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out[n] = tmp.c[n] ^ ivec[n]; |
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ivec[n] = c; |
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} |
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len -= 16; |
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in += 16; |
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out += 16; |
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} |
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} else if (16 % sizeof(size_t) == 0) { /* always true */ |
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while (len >= 16) { |
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size_t c, *out_t = (size_t *)out, *ivec_t = (size_t *)ivec; |
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const size_t *in_t = (const size_t *)in; |
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(*block) (in, tmp.c, key); |
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for (n = 0; n < 16 / sizeof(size_t); n++) { |
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c = in_t[n]; |
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out_t[n] = tmp.t[n] ^ ivec_t[n]; |
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ivec_t[n] = c; |
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} |
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len -= 16; |
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in += 16; |
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out += 16; |
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} |
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} |
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} |
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#endif |
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while (len) { |
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unsigned char c; |
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(*block) (in, tmp.c, key); |
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for (n = 0; n < 16 && n < len; ++n) { |
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c = in[n]; |
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out[n] = tmp.c[n] ^ ivec[n]; |
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ivec[n] = c; |
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} |
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if (len <= 16) { |
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for (; n < 16; ++n) |
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ivec[n] = in[n]; |
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break; |
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} |
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len -= 16; |
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in += 16; |
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out += 16; |
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} |
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}
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