GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libcrypto/aes/aes_wrap.c Lines: 38 49 77.6 %
Date: 2017-11-13 Branches: 16 24 66.7 %

Line Branch Exec Source
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/* $OpenBSD: aes_wrap.c,v 1.10 2015/09/10 15:56:24 jsing Exp $ */
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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) 2008 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 <string.h>
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#include <openssl/aes.h>
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#include <openssl/bio.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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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 < 8))
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		return -1;
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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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		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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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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	inlen -= 8;
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	if (inlen & 0x7)
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		return -1;
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	if (inlen < 8)
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		return -1;
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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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		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 = 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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}