226 lines
7 KiB
C
226 lines
7 KiB
C
/* $OpenBSD: aes.c,v 1.4 2024/08/11 13:02:39 jsing Exp $ */
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/* ====================================================================
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* Copyright (c) 2002-2006 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 <string.h>
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#include <openssl/aes.h>
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#include <openssl/bio.h>
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#include <openssl/modes.h>
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#include "crypto_arch.h"
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static const unsigned char aes_wrap_default_iv[] = {
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0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6,
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};
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#ifdef HAVE_AES_CBC_ENCRYPT_INTERNAL
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void aes_cbc_encrypt_internal(const unsigned char *in, unsigned char *out,
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size_t len, const AES_KEY *key, unsigned char *ivec, const int enc);
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#else
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static inline void
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aes_cbc_encrypt_internal(const unsigned char *in, unsigned char *out,
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size_t len, const AES_KEY *key, unsigned char *ivec, const int enc)
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{
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if (enc)
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CRYPTO_cbc128_encrypt(in, out, len, key, ivec,
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(block128_f)AES_encrypt);
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else
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CRYPTO_cbc128_decrypt(in, out, len, key, ivec,
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(block128_f)AES_decrypt);
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}
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#endif
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void
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AES_cbc_encrypt(const unsigned char *in, unsigned char *out,
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size_t len, const AES_KEY *key, unsigned char *ivec, const int enc)
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{
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aes_cbc_encrypt_internal(in, out, len, key, ivec, enc);
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}
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LCRYPTO_ALIAS(AES_cbc_encrypt);
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/*
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* The input and output encrypted as though 128bit cfb mode is being
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* used. The extra state information to record how much of the
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* 128bit block we have used is contained in *num;
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*/
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void
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AES_cfb128_encrypt(const unsigned char *in, unsigned char *out, size_t length,
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const AES_KEY *key, unsigned char *ivec, int *num, const int enc)
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{
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CRYPTO_cfb128_encrypt(in, out, length, key, ivec, num, enc,
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(block128_f)AES_encrypt);
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}
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LCRYPTO_ALIAS(AES_cfb128_encrypt);
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/* N.B. This expects the input to be packed, MS bit first */
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void
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AES_cfb1_encrypt(const unsigned char *in, unsigned char *out, size_t length,
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const AES_KEY *key, unsigned char *ivec, int *num, const int enc)
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{
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CRYPTO_cfb128_1_encrypt(in, out, length, key, ivec, num, enc,
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(block128_f)AES_encrypt);
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}
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LCRYPTO_ALIAS(AES_cfb1_encrypt);
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void
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AES_cfb8_encrypt(const unsigned char *in, unsigned char *out, size_t length,
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const AES_KEY *key, unsigned char *ivec, int *num, const int enc)
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{
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CRYPTO_cfb128_8_encrypt(in, out, length, key, ivec, num, enc,
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(block128_f)AES_encrypt);
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}
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LCRYPTO_ALIAS(AES_cfb8_encrypt);
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void
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AES_ctr128_encrypt(const unsigned char *in, unsigned char *out,
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size_t length, const AES_KEY *key, unsigned char ivec[AES_BLOCK_SIZE],
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unsigned char ecount_buf[AES_BLOCK_SIZE], unsigned int *num)
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{
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CRYPTO_ctr128_encrypt(in, out, length, key, ivec, ecount_buf, num,
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(block128_f)AES_encrypt);
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}
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LCRYPTO_ALIAS(AES_ctr128_encrypt);
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void
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AES_ecb_encrypt(const unsigned char *in, unsigned char *out,
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const AES_KEY *key, const int enc)
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{
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if (AES_ENCRYPT == enc)
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AES_encrypt(in, out, key);
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else
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AES_decrypt(in, out, key);
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}
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LCRYPTO_ALIAS(AES_ecb_encrypt);
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void
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AES_ofb128_encrypt(const unsigned char *in, unsigned char *out, size_t length,
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const AES_KEY *key, unsigned char *ivec, int *num)
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{
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CRYPTO_ofb128_encrypt(in, out, length, key, ivec, num,
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(block128_f)AES_encrypt);
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}
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LCRYPTO_ALIAS(AES_ofb128_encrypt);
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int
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AES_wrap_key(AES_KEY *key, const unsigned char *iv, unsigned char *out,
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const unsigned char *in, unsigned int inlen)
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{
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unsigned char *A, B[16], *R;
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unsigned int i, j, t;
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if ((inlen & 0x7) || (inlen < 16))
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return -1;
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A = B;
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t = 1;
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memmove(out + 8, in, inlen);
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if (!iv)
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iv = aes_wrap_default_iv;
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memcpy(A, iv, 8);
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for (j = 0; j < 6; j++) {
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R = out + 8;
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for (i = 0; i < inlen; i += 8, t++, R += 8) {
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memcpy(B + 8, R, 8);
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AES_encrypt(B, B, key);
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A[7] ^= (unsigned char)(t & 0xff);
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if (t > 0xff) {
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A[6] ^= (unsigned char)((t >> 8) & 0xff);
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A[5] ^= (unsigned char)((t >> 16) & 0xff);
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A[4] ^= (unsigned char)((t >> 24) & 0xff);
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}
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memcpy(R, B + 8, 8);
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}
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}
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memcpy(out, A, 8);
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return inlen + 8;
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}
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LCRYPTO_ALIAS(AES_wrap_key);
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int
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AES_unwrap_key(AES_KEY *key, const unsigned char *iv, unsigned char *out,
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const unsigned char *in, unsigned int inlen)
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{
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unsigned char *A, B[16], *R;
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unsigned int i, j, t;
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if ((inlen & 0x7) || (inlen < 24))
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return -1;
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inlen -= 8;
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A = B;
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t = 6 * (inlen >> 3);
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memcpy(A, in, 8);
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memmove(out, in + 8, inlen);
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for (j = 0; j < 6; j++) {
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R = out + inlen - 8;
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for (i = 0; i < inlen; i += 8, t--, R -= 8) {
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A[7] ^= (unsigned char)(t & 0xff);
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if (t > 0xff) {
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A[6] ^= (unsigned char)((t >> 8) & 0xff);
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A[5] ^= (unsigned char)((t >> 16) & 0xff);
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A[4] ^= (unsigned char)((t >> 24) & 0xff);
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}
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memcpy(B + 8, R, 8);
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AES_decrypt(B, B, key);
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memcpy(R, B + 8, 8);
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}
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}
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if (!iv)
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iv = aes_wrap_default_iv;
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if (memcmp(A, iv, 8)) {
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explicit_bzero(out, inlen);
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return 0;
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}
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return inlen;
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}
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LCRYPTO_ALIAS(AES_unwrap_key);
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