139 lines
4.4 KiB
C
139 lines
4.4 KiB
C
/* ====================================================================
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* Copyright (c) 2001-2011 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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#include <openssl/aes.h>
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#include <limits.h>
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#include <string.h>
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#include <openssl/mem.h>
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#include "../../internal.h"
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// kDefaultIV is the default IV value given in RFC 3394, 2.2.3.1.
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static const uint8_t kDefaultIV[] = {
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0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6,
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};
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static const unsigned kBound = 6;
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int AES_wrap_key(const AES_KEY *key, const uint8_t *iv, uint8_t *out,
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const uint8_t *in, size_t in_len) {
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// See RFC 3394, section 2.2.1.
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if (in_len > INT_MAX - 8 || in_len < 8 || in_len % 8 != 0) {
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return -1;
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}
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if (iv == NULL) {
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iv = kDefaultIV;
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}
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OPENSSL_memmove(out + 8, in, in_len);
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uint8_t A[AES_BLOCK_SIZE];
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OPENSSL_memcpy(A, iv, 8);
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size_t n = in_len / 8;
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for (unsigned j = 0; j < kBound; j++) {
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for (size_t i = 1; i <= n; i++) {
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OPENSSL_memcpy(A + 8, out + 8 * i, 8);
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AES_encrypt(A, A, key);
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uint32_t t = (uint32_t)(n * j + i);
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A[7] ^= t & 0xff;
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A[6] ^= (t >> 8) & 0xff;
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A[5] ^= (t >> 16) & 0xff;
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A[4] ^= (t >> 24) & 0xff;
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OPENSSL_memcpy(out + 8 * i, A + 8, 8);
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}
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}
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OPENSSL_memcpy(out, A, 8);
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return (int)in_len + 8;
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}
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int AES_unwrap_key(const AES_KEY *key, const uint8_t *iv, uint8_t *out,
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const uint8_t *in, size_t in_len) {
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// See RFC 3394, section 2.2.2.
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if (in_len > INT_MAX || in_len < 16 || in_len % 8 != 0) {
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return -1;
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}
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if (iv == NULL) {
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iv = kDefaultIV;
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}
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uint8_t A[AES_BLOCK_SIZE];
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OPENSSL_memcpy(A, in, 8);
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OPENSSL_memmove(out, in + 8, in_len - 8);
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size_t n = (in_len / 8) - 1;
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for (unsigned j = kBound - 1; j < kBound; j--) {
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for (size_t i = n; i > 0; i--) {
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uint32_t t = (uint32_t)(n * j + i);
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A[7] ^= t & 0xff;
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A[6] ^= (t >> 8) & 0xff;
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A[5] ^= (t >> 16) & 0xff;
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A[4] ^= (t >> 24) & 0xff;
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OPENSSL_memcpy(A + 8, out + 8 * (i - 1), 8);
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AES_decrypt(A, A, key);
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OPENSSL_memcpy(out + 8 * (i - 1), A + 8, 8);
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}
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}
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if (CRYPTO_memcmp(A, iv, 8) != 0) {
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return -1;
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}
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return (int)in_len - 8;
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}
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