323 lines
9.4 KiB
C
323 lines
9.4 KiB
C
/* crypto/aes/aes_ige.c -*- mode:C; c-file-style: "eay" -*- */
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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 "cryptlib.h"
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#include <openssl/aes.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 AES_ige_encrypt(const unsigned char *in, unsigned char *out,
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size_t length, const AES_KEY *key,
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unsigned char *ivec, const int enc)
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{
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size_t n;
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size_t len = length;
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OPENSSL_assert(in && out && key && ivec);
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OPENSSL_assert((AES_ENCRYPT == enc)||(AES_DECRYPT == enc));
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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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{
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if (in != out &&
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(UNALIGNED_MEMOPS_ARE_FAST || ((size_t)in|(size_t)out|(size_t)ivec)%sizeof(long)==0))
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{
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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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{
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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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}
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else
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{
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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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{
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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, (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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}
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else
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{
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if (in != out &&
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(UNALIGNED_MEMOPS_ARE_FAST || ((size_t)in|(size_t)out|(size_t)ivec)%sizeof(long)==0))
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{
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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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{
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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, (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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}
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else
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{
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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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{
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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, (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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/*
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* Note that its effectively impossible to do biIGE in anything other
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* than a single pass, so no provision is made for chaining.
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*/
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/* N.B. The IV for this mode is _four times_ the block size */
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void AES_bi_ige_encrypt(const unsigned char *in, unsigned char *out,
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size_t length, const AES_KEY *key,
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const AES_KEY *key2, const unsigned char *ivec,
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const int enc)
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{
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size_t n;
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size_t len = length;
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unsigned char tmp[AES_BLOCK_SIZE];
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unsigned char tmp2[AES_BLOCK_SIZE];
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unsigned char tmp3[AES_BLOCK_SIZE];
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unsigned char prev[AES_BLOCK_SIZE];
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const unsigned char *iv;
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const unsigned char *iv2;
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OPENSSL_assert(in && out && key && ivec);
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OPENSSL_assert((AES_ENCRYPT == enc)||(AES_DECRYPT == enc));
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OPENSSL_assert((length%AES_BLOCK_SIZE) == 0);
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if (AES_ENCRYPT == enc)
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{
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/* XXX: Do a separate case for when in != out (strictly should
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check for overlap, too) */
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/* First the forward pass */
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iv = ivec;
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iv2 = ivec + AES_BLOCK_SIZE;
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while (len >= AES_BLOCK_SIZE)
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{
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for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
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out[n] = in[n] ^ iv[n];
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AES_encrypt(out, out, key);
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for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
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out[n] ^= iv2[n];
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iv = out;
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memcpy(prev, in, AES_BLOCK_SIZE);
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iv2 = prev;
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len -= AES_BLOCK_SIZE;
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in += AES_BLOCK_SIZE;
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out += AES_BLOCK_SIZE;
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}
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/* And now backwards */
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iv = ivec + AES_BLOCK_SIZE*2;
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iv2 = ivec + AES_BLOCK_SIZE*3;
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len = length;
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while(len >= AES_BLOCK_SIZE)
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{
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out -= AES_BLOCK_SIZE;
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/* XXX: reduce copies by alternating between buffers */
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memcpy(tmp, out, AES_BLOCK_SIZE);
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for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
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out[n] ^= iv[n];
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/* hexdump(stdout, "out ^ iv", out, AES_BLOCK_SIZE); */
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AES_encrypt(out, out, key);
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/* hexdump(stdout,"enc", out, AES_BLOCK_SIZE); */
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/* hexdump(stdout,"iv2", iv2, AES_BLOCK_SIZE); */
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for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
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out[n] ^= iv2[n];
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/* hexdump(stdout,"out", out, AES_BLOCK_SIZE); */
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iv = out;
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memcpy(prev, tmp, AES_BLOCK_SIZE);
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iv2 = prev;
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len -= AES_BLOCK_SIZE;
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}
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}
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else
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{
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/* First backwards */
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iv = ivec + AES_BLOCK_SIZE*2;
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iv2 = ivec + AES_BLOCK_SIZE*3;
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in += length;
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out += length;
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while (len >= AES_BLOCK_SIZE)
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{
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in -= AES_BLOCK_SIZE;
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out -= AES_BLOCK_SIZE;
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memcpy(tmp, in, AES_BLOCK_SIZE);
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memcpy(tmp2, in, AES_BLOCK_SIZE);
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for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
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tmp[n] ^= iv2[n];
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AES_decrypt(tmp, out, key);
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for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
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out[n] ^= iv[n];
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memcpy(tmp3, tmp2, AES_BLOCK_SIZE);
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iv = tmp3;
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iv2 = out;
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len -= AES_BLOCK_SIZE;
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}
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/* And now forwards */
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iv = ivec;
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iv2 = ivec + AES_BLOCK_SIZE;
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len = length;
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while (len >= AES_BLOCK_SIZE)
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{
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memcpy(tmp, out, AES_BLOCK_SIZE);
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memcpy(tmp2, out, AES_BLOCK_SIZE);
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for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
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tmp[n] ^= iv2[n];
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AES_decrypt(tmp, out, key);
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for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
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out[n] ^= iv[n];
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memcpy(tmp3, tmp2, AES_BLOCK_SIZE);
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iv = tmp3;
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iv2 = out;
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len -= AES_BLOCK_SIZE;
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in += AES_BLOCK_SIZE;
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out += AES_BLOCK_SIZE;
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}
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}
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}
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