pineapple/externals/libressl/crypto/aes/aes_wrap.c
2020-12-28 15:15:37 +00:00

133 lines
4.2 KiB
C
Executable file

/* $OpenBSD: aes_wrap.c,v 1.12 2018/11/07 18:31:16 tb Exp $ */
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
* project.
*/
/* ====================================================================
* Copyright (c) 2008 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
* licensing@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 <string.h>
#include <openssl/aes.h>
#include <openssl/bio.h>
static const unsigned char default_iv[] = {
0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6,
};
int
AES_wrap_key(AES_KEY *key, const unsigned char *iv, unsigned char *out,
const unsigned char *in, unsigned int inlen)
{
unsigned char *A, B[16], *R;
unsigned int i, j, t;
if ((inlen & 0x7) || (inlen < 16))
return -1;
A = B;
t = 1;
memmove(out + 8, in, inlen);
if (!iv)
iv = default_iv;
memcpy(A, iv, 8);
for (j = 0; j < 6; j++) {
R = out + 8;
for (i = 0; i < inlen; i += 8, t++, R += 8) {
memcpy(B + 8, R, 8);
AES_encrypt(B, B, key);
A[7] ^= (unsigned char)(t & 0xff);
if (t > 0xff) {
A[6] ^= (unsigned char)((t >> 8) & 0xff);
A[5] ^= (unsigned char)((t >> 16) & 0xff);
A[4] ^= (unsigned char)((t >> 24) & 0xff);
}
memcpy(R, B + 8, 8);
}
}
memcpy(out, A, 8);
return inlen + 8;
}
int
AES_unwrap_key(AES_KEY *key, const unsigned char *iv, unsigned char *out,
const unsigned char *in, unsigned int inlen)
{
unsigned char *A, B[16], *R;
unsigned int i, j, t;
if ((inlen & 0x7) || (inlen < 24))
return -1;
inlen -= 8;
A = B;
t = 6 * (inlen >> 3);
memcpy(A, in, 8);
memmove(out, in + 8, inlen);
for (j = 0; j < 6; j++) {
R = out + inlen - 8;
for (i = 0; i < inlen; i += 8, t--, R -= 8) {
A[7] ^= (unsigned char)(t & 0xff);
if (t > 0xff) {
A[6] ^= (unsigned char)((t >> 8) & 0xff);
A[5] ^= (unsigned char)((t >> 16) & 0xff);
A[4] ^= (unsigned char)((t >> 24) & 0xff);
}
memcpy(B + 8, R, 8);
AES_decrypt(B, B, key);
memcpy(R, B + 8, 8);
}
}
if (!iv)
iv = default_iv;
if (memcmp(A, iv, 8)) {
explicit_bzero(out, inlen);
return 0;
}
return inlen;
}