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/* ====================================================================
* Copyright (c) 2001-2011 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* openssl-core@openssl.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ==================================================================== */
#include <openssl/aes.h>
#include <limits.h>
#include <string.h>
#include <openssl/mem.h>
#include "../../internal.h"
// kDefaultIV is the default IV value given in RFC 3394, 2.2.3.1.
static const uint8_t kDefaultIV[] = {
0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6, 0xa6,
};
static const unsigned kBound = 6;
int AES_wrap_key(const AES_KEY *key, const uint8_t *iv, uint8_t *out,
const uint8_t *in, size_t in_len) {
// See RFC 3394, section 2.2.1. Additionally, note that section 2 requires the
// plaintext be at least two 8-byte blocks.
if (in_len > INT_MAX - 8 || in_len < 16 || in_len % 8 != 0) {
return -1;
}
if (iv == NULL) {
iv = kDefaultIV;
}
OPENSSL_memmove(out + 8, in, in_len);
uint8_t A[AES_BLOCK_SIZE];
OPENSSL_memcpy(A, iv, 8);
size_t n = in_len / 8;
for (unsigned j = 0; j < kBound; j++) {
for (size_t i = 1; i <= n; i++) {
OPENSSL_memcpy(A + 8, out + 8 * i, 8);
AES_encrypt(A, A, key);
uint32_t t = (uint32_t)(n * j + i);
A[7] ^= t & 0xff;
A[6] ^= (t >> 8) & 0xff;
A[5] ^= (t >> 16) & 0xff;
A[4] ^= (t >> 24) & 0xff;
OPENSSL_memcpy(out + 8 * i, A + 8, 8);
}
}
OPENSSL_memcpy(out, A, 8);
return (int)in_len + 8;
}
int AES_unwrap_key(const AES_KEY *key, const uint8_t *iv, uint8_t *out,
const uint8_t *in, size_t in_len) {
// See RFC 3394, section 2.2.2. Additionally, note that section 2 requires the
// plaintext be at least two 8-byte blocks, so the ciphertext must be at least
// three blocks.
if (in_len > INT_MAX || in_len < 24 || in_len % 8 != 0) {
return -1;
}
if (iv == NULL) {
iv = kDefaultIV;
}
uint8_t A[AES_BLOCK_SIZE];
OPENSSL_memcpy(A, in, 8);
OPENSSL_memmove(out, in + 8, in_len - 8);
size_t n = (in_len / 8) - 1;
for (unsigned j = kBound - 1; j < kBound; j--) {
for (size_t i = n; i > 0; i--) {
uint32_t t = (uint32_t)(n * j + i);
A[7] ^= t & 0xff;
A[6] ^= (t >> 8) & 0xff;
A[5] ^= (t >> 16) & 0xff;
A[4] ^= (t >> 24) & 0xff;
OPENSSL_memcpy(A + 8, out + 8 * (i - 1), 8);
AES_decrypt(A, A, key);
OPENSSL_memcpy(out + 8 * (i - 1), A + 8, 8);
}
}
if (CRYPTO_memcmp(A, iv, 8) != 0) {
return -1;
}
return (int)in_len - 8;
}