fd367b4ce3
These undocumented functions were never integrated into the EVP layer and implement the AES Infinite Garble Extension (IGE) mode and AES Bi-directional IGE mode. These modes were never formally standardised and usage of these functions is believed to be very small. In particular AES_bi_ige_encrypt() has a known bug. It accepts 2 AES keys, but only one is ever used. The security implications are believed to be minimal, but this issue was never fixed for backwards compatibility reasons. Reviewed-by: Richard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/8710)
298 lines
9.8 KiB
C
298 lines
9.8 KiB
C
/*
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* Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include "internal/cryptlib.h"
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#if OPENSSL_API_3
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NON_EMPTY_TRANSLATION_UNIT
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#else
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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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/* Use of this function is deprecated. */
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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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if (length == 0)
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return;
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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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if (in != out &&
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(UNALIGNED_MEMOPS_ARE_FAST
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|| ((size_t)in | (size_t)out | (size_t)ivec) % sizeof(long) ==
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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,
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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] ^= 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 &&
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(UNALIGNED_MEMOPS_ARE_FAST
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|| ((size_t)in | (size_t)out | (size_t)ivec) % sizeof(long) ==
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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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/*
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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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* NB: The implementation of AES_bi_ige_encrypt has a bug. It is supposed to use
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* 2 AES keys, but in fact only one is ever used. This bug has been present
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* since this code was first implemented. It is believed to have minimal
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* security impact in practice and has therefore not been fixed for backwards
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* compatibility reasons.
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*
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* Use of this function is deprecated.
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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 check
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* for overlap, too)
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*/
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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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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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out -= AES_BLOCK_SIZE;
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/*
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* XXX: reduce copies by alternating between buffers
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*/
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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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/*
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* hexdump(stdout, "out ^ iv", out, AES_BLOCK_SIZE);
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*/
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AES_encrypt(out, out, key);
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/*
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* hexdump(stdout,"enc", out, AES_BLOCK_SIZE);
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*/
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/*
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* hexdump(stdout,"iv2", iv2, 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] ^= iv2[n];
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/*
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* hexdump(stdout,"out", out, AES_BLOCK_SIZE);
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*/
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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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} else {
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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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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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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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#endif
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