195 lines
6.3 KiB
C
195 lines
6.3 KiB
C
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/* $OpenBSD: aes_ige.c,v 1.7 2015/02/10 09:46:30 miod Exp $ */
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/* ====================================================================
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* Copyright (c) 2006 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/aes.h>
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#include <openssl/crypto.h>
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#include "aes_locl.h"
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#define N_WORDS (AES_BLOCK_SIZE / sizeof(unsigned long))
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typedef struct {
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unsigned long data[N_WORDS];
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} aes_block_t;
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/* XXX: probably some better way to do this */
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#if defined(__i386__) || defined(__x86_64__)
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#define UNALIGNED_MEMOPS_ARE_FAST 1
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#else
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#define UNALIGNED_MEMOPS_ARE_FAST 0
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#endif
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#if UNALIGNED_MEMOPS_ARE_FAST
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#define load_block(d, s) (d) = *(const aes_block_t *)(s)
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#define store_block(d, s) *(aes_block_t *)(d) = (s)
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#else
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#define load_block(d, s) memcpy((d).data, (s), AES_BLOCK_SIZE)
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#define store_block(d, s) memcpy((d), (s).data, AES_BLOCK_SIZE)
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#endif
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/* N.B. The IV for this mode is _twice_ the block size */
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void
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AES_ige_encrypt(const unsigned char *in, unsigned char *out, size_t length,
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const AES_KEY *key, unsigned char *ivec, const int enc)
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{
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size_t n;
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size_t len;
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OPENSSL_assert((length % AES_BLOCK_SIZE) == 0);
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len = length / AES_BLOCK_SIZE;
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if (AES_ENCRYPT == enc) {
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if (in != out && (UNALIGNED_MEMOPS_ARE_FAST ||
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((size_t)in|(size_t)out|(size_t)ivec) %
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sizeof(long) == 0)) {
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aes_block_t *ivp = (aes_block_t *)ivec;
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aes_block_t *iv2p = (aes_block_t *)(ivec + AES_BLOCK_SIZE);
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while (len) {
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aes_block_t *inp = (aes_block_t *)in;
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aes_block_t *outp = (aes_block_t *)out;
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for (n = 0; n < N_WORDS; ++n)
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outp->data[n] = inp->data[n] ^ ivp->data[n];
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AES_encrypt((unsigned char *)outp->data, (unsigned char *)outp->data, key);
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for (n = 0; n < N_WORDS; ++n)
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outp->data[n] ^= iv2p->data[n];
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ivp = outp;
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iv2p = inp;
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--len;
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in += AES_BLOCK_SIZE;
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out += AES_BLOCK_SIZE;
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}
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memcpy(ivec, ivp->data, AES_BLOCK_SIZE);
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memcpy(ivec + AES_BLOCK_SIZE, iv2p->data, AES_BLOCK_SIZE);
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} else {
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aes_block_t tmp, tmp2;
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aes_block_t iv;
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aes_block_t iv2;
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load_block(iv, ivec);
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load_block(iv2, ivec + AES_BLOCK_SIZE);
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while (len) {
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load_block(tmp, in);
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for (n = 0; n < N_WORDS; ++n)
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tmp2.data[n] = tmp.data[n] ^ iv.data[n];
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AES_encrypt((unsigned char *)tmp2.data,
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(unsigned char *)tmp2.data, key);
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for (n = 0; n < N_WORDS; ++n)
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tmp2.data[n] ^= iv2.data[n];
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store_block(out, tmp2);
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iv = tmp2;
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iv2 = tmp;
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--len;
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in += AES_BLOCK_SIZE;
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out += AES_BLOCK_SIZE;
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}
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memcpy(ivec, iv.data, AES_BLOCK_SIZE);
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memcpy(ivec + AES_BLOCK_SIZE, iv2.data, AES_BLOCK_SIZE);
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}
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} else {
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if (in != out && (UNALIGNED_MEMOPS_ARE_FAST ||
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((size_t)in|(size_t)out|(size_t)ivec) %
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sizeof(long) == 0)) {
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aes_block_t *ivp = (aes_block_t *)ivec;
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aes_block_t *iv2p = (aes_block_t *)(ivec + AES_BLOCK_SIZE);
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while (len) {
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aes_block_t tmp;
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aes_block_t *inp = (aes_block_t *)in;
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aes_block_t *outp = (aes_block_t *)out;
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for (n = 0; n < N_WORDS; ++n)
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tmp.data[n] = inp->data[n] ^ iv2p->data[n];
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AES_decrypt((unsigned char *)tmp.data,
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(unsigned char *)outp->data, key);
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for (n = 0; n < N_WORDS; ++n)
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outp->data[n] ^= ivp->data[n];
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ivp = inp;
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iv2p = outp;
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--len;
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in += AES_BLOCK_SIZE;
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out += AES_BLOCK_SIZE;
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}
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memcpy(ivec, ivp->data, AES_BLOCK_SIZE);
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memcpy(ivec + AES_BLOCK_SIZE, iv2p->data, AES_BLOCK_SIZE);
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} else {
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aes_block_t tmp, tmp2;
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aes_block_t iv;
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aes_block_t iv2;
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load_block(iv, ivec);
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load_block(iv2, ivec + AES_BLOCK_SIZE);
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while (len) {
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load_block(tmp, in);
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tmp2 = tmp;
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for (n = 0; n < N_WORDS; ++n)
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tmp.data[n] ^= iv2.data[n];
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AES_decrypt((unsigned char *)tmp.data,
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(unsigned char *)tmp.data, key);
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for (n = 0; n < N_WORDS; ++n)
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tmp.data[n] ^= iv.data[n];
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store_block(out, tmp);
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iv = tmp2;
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iv2 = tmp;
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--len;
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in += AES_BLOCK_SIZE;
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out += AES_BLOCK_SIZE;
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}
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memcpy(ivec, iv.data, AES_BLOCK_SIZE);
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memcpy(ivec + AES_BLOCK_SIZE, iv2.data, AES_BLOCK_SIZE);
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}
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}
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}
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