140 lines
4.4 KiB
C
140 lines
4.4 KiB
C
/* crypto/modes/wrap128.c */
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/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
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* project.
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*/
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/* ====================================================================
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* Copyright (c) 2013 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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* licensing@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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#include "cryptlib.h"
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#include <openssl/modes.h>
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static const unsigned char default_iv[] = {
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0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6,
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};
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/* Input size limit: lower than maximum of standards but far larger than
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* anything that will be used in practice.
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*/
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#define CRYPTO128_WRAP_MAX (1UL << 31)
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size_t CRYPTO_128_wrap(void *key, const unsigned char *iv,
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unsigned char *out,
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const unsigned char *in, size_t inlen, block128_f block)
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{
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unsigned char *A, B[16], *R;
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size_t i, j, t;
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if ((inlen & 0x7) || (inlen < 8) || (inlen > CRYPTO128_WRAP_MAX))
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return 0;
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A = B;
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t = 1;
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memcpy(out + 8, in, inlen);
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if (!iv)
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iv = default_iv;
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memcpy(A, iv, 8);
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for (j = 0; j < 6; j++)
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{
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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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{
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memcpy(B + 8, R, 8);
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block(B, B, key);
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A[7] ^= (unsigned char)(t & 0xff);
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if (t > 0xff)
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{
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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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size_t CRYPTO_128_unwrap(void *key, const unsigned char *iv,
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unsigned char *out,
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const unsigned char *in, size_t inlen, block128_f block)
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{
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unsigned char *A, B[16], *R;
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size_t i, j, t;
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inlen -= 8;
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if ((inlen & 0x7) || (inlen < 16) || (inlen > CRYPTO128_WRAP_MAX))
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return 0;
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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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memcpy(out, in + 8, inlen);
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for (j = 0; j < 6; j++)
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{
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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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{
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A[7] ^= (unsigned char)(t & 0xff);
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if (t > 0xff)
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{
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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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block(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 = default_iv;
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if (memcmp(A, iv, 8))
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{
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OPENSSL_cleanse(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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