Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libcrypto/hmac/hmac.c	Lines:	81	90	90.0 %
Date:	2017-11-13	Branches:	49	72	68.1 %


/* $OpenBSD: hmac.c,v 1.24 2017/03/03 10:39:07 inoguchi Exp $ */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 *
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * 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 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 acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS 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 AUTHOR OR 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.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <openssl/err.h>
#include <openssl/hmac.h>

int
HMAC_Init_ex(HMAC_CTX *ctx, const void *key, int len, const EVP_MD *md,
    ENGINE *impl)
{
	int i, j, reset = 0;
	unsigned char pad[HMAC_MAX_MD_CBLOCK];

	/* If we are changing MD then we must have a key */
	if (md != NULL && md != ctx->md && (key == NULL || len < 0))
		return 0;

	if (md != NULL) {
		reset = 1;
		ctx->md = md;
	} else if (ctx->md != NULL)
		md = ctx->md;
	else
		return 0;

	if (key != NULL) {
		reset = 1;
		j = EVP_MD_block_size(md);
		if ((size_t)j > sizeof(ctx->key)) {
			EVPerror(EVP_R_BAD_BLOCK_LENGTH);
			goto err;
		}
		if (j < len) {
			if (!EVP_DigestInit_ex(&ctx->md_ctx, md, impl))
				goto err;
			if (!EVP_DigestUpdate(&ctx->md_ctx, key, len))
				goto err;
			if (!EVP_DigestFinal_ex(&(ctx->md_ctx), ctx->key,
			    &ctx->key_length))
				goto err;
		} else {
			if (len < 0 || (size_t)len > sizeof(ctx->key)) {
				EVPerror(EVP_R_BAD_KEY_LENGTH);
				goto err;
			}
			memcpy(ctx->key, key, len);
			ctx->key_length = len;
		}
		if (ctx->key_length != HMAC_MAX_MD_CBLOCK)
			memset(&ctx->key[ctx->key_length], 0,
			    HMAC_MAX_MD_CBLOCK - ctx->key_length);
	}

	if (reset) {
		for (i = 0; i < HMAC_MAX_MD_CBLOCK; i++)
			pad[i] = 0x36 ^ ctx->key[i];
		if (!EVP_DigestInit_ex(&ctx->i_ctx, md, impl))
			goto err;
		if (!EVP_DigestUpdate(&ctx->i_ctx, pad, EVP_MD_block_size(md)))
			goto err;

		for (i = 0; i < HMAC_MAX_MD_CBLOCK; i++)
			pad[i] = 0x5c ^ ctx->key[i];
		if (!EVP_DigestInit_ex(&ctx->o_ctx, md, impl))
			goto err;
		if (!EVP_DigestUpdate(&ctx->o_ctx, pad, EVP_MD_block_size(md)))
			goto err;
	}
	if (!EVP_MD_CTX_copy_ex(&ctx->md_ctx, &ctx->i_ctx))
		goto err;
	return 1;
err:
	return 0;
}

int
HMAC_Init(HMAC_CTX *ctx, const void *key, int len, const EVP_MD *md)
{
	if (key && md)
		HMAC_CTX_init(ctx);
	return HMAC_Init_ex(ctx, key, len, md, NULL);
}

int
HMAC_Update(HMAC_CTX *ctx, const unsigned char *data, size_t len)
{
	if (ctx->md == NULL)
		return 0;

	return EVP_DigestUpdate(&ctx->md_ctx, data, len);
}

int
HMAC_Final(HMAC_CTX *ctx, unsigned char *md, unsigned int *len)
{
	unsigned int i;
	unsigned char buf[EVP_MAX_MD_SIZE];

	if (ctx->md == NULL)
		goto err;

	if (!EVP_DigestFinal_ex(&ctx->md_ctx, buf, &i))
		goto err;
	if (!EVP_MD_CTX_copy_ex(&ctx->md_ctx, &ctx->o_ctx))
		goto err;
	if (!EVP_DigestUpdate(&ctx->md_ctx, buf, i))
		goto err;
	if (!EVP_DigestFinal_ex(&ctx->md_ctx, md, len))
		goto err;
	return 1;
err:
	return 0;
}

void
HMAC_CTX_init(HMAC_CTX *ctx)
{
	EVP_MD_CTX_init(&ctx->i_ctx);
	EVP_MD_CTX_init(&ctx->o_ctx);
	EVP_MD_CTX_init(&ctx->md_ctx);
	ctx->md = NULL;
}

int
HMAC_CTX_copy(HMAC_CTX *dctx, HMAC_CTX *sctx)
{
	if (!EVP_MD_CTX_copy(&dctx->i_ctx, &sctx->i_ctx))
		goto err;
	if (!EVP_MD_CTX_copy(&dctx->o_ctx, &sctx->o_ctx))
		goto err;
	if (!EVP_MD_CTX_copy(&dctx->md_ctx, &sctx->md_ctx))
		goto err;
	memcpy(dctx->key, sctx->key, HMAC_MAX_MD_CBLOCK);
	dctx->key_length = sctx->key_length;
	dctx->md = sctx->md;
	return 1;
err:
	return 0;
}

void
HMAC_CTX_cleanup(HMAC_CTX *ctx)
{
	EVP_MD_CTX_cleanup(&ctx->i_ctx);
	EVP_MD_CTX_cleanup(&ctx->o_ctx);
	EVP_MD_CTX_cleanup(&ctx->md_ctx);
	explicit_bzero(ctx, sizeof(*ctx));
}

unsigned char *
HMAC(const EVP_MD *evp_md, const void *key, int key_len, const unsigned char *d,
    size_t n, unsigned char *md, unsigned int *md_len)
{
	HMAC_CTX c;
	static unsigned char m[EVP_MAX_MD_SIZE];

	if (md == NULL)
		md = m;
	HMAC_CTX_init(&c);
	if (!HMAC_Init(&c, key, key_len, evp_md))
		goto err;
	if (!HMAC_Update(&c, d, n))
		goto err;
	if (!HMAC_Final(&c, md, md_len))
		goto err;
	HMAC_CTX_cleanup(&c);
	return md;
err:
	HMAC_CTX_cleanup(&c);
	return NULL;
}

void
HMAC_CTX_set_flags(HMAC_CTX *ctx, unsigned long flags)
{
	EVP_MD_CTX_set_flags(&ctx->i_ctx, flags);
	EVP_MD_CTX_set_flags(&ctx->o_ctx, flags);
	EVP_MD_CTX_set_flags(&ctx->md_ctx, flags);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: hmac.c,v 1.24 2017/03/03 10:39:07 inoguchi Exp $ */
2			/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3			* All rights reserved.
4			*
5			* This package is an SSL implementation written
6			* by Eric Young (eay@cryptsoft.com).
7			* The implementation was written so as to conform with Netscapes SSL.
8			*
9			* This library is free for commercial and non-commercial use as long as
10			* the following conditions are aheared to. The following conditions
11			* apply to all code found in this distribution, be it the RC4, RSA,
12			* lhash, DES, etc., code; not just the SSL code. The SSL documentation
13			* included with this distribution is covered by the same copyright terms
14			* except that the holder is Tim Hudson (tjh@cryptsoft.com).
15			*
16			* Copyright remains Eric Young's, and as such any Copyright notices in
17			* the code are not to be removed.
18			* If this package is used in a product, Eric Young should be given attribution
19			* as the author of the parts of the library used.
20			* This can be in the form of a textual message at program startup or
21			* in documentation (online or textual) provided with the package.
22			*
23			* Redistribution and use in source and binary forms, with or without
24			* modification, are permitted provided that the following conditions
25			* are met:
26			* 1. Redistributions of source code must retain the copyright
27			* notice, this list of conditions and the following disclaimer.
28			* 2. Redistributions in binary form must reproduce the above copyright
29			* notice, this list of conditions and the following disclaimer in the
30			* documentation and/or other materials provided with the distribution.
31			* 3. All advertising materials mentioning features or use of this software
32			* must display the following acknowledgement:
33			* "This product includes cryptographic software written by
34			* Eric Young (eay@cryptsoft.com)"
35			* The word 'cryptographic' can be left out if the rouines from the library
36			* being used are not cryptographic related :-).
37			* 4. If you include any Windows specific code (or a derivative thereof) from
38			* the apps directory (application code) you must include an acknowledgement:
39			* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40			*
41			* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42			* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44			* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45			* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46			* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47			* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49			* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50			* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51			* SUCH DAMAGE.
52			*
53			* The licence and distribution terms for any publically available version or
54			* derivative of this code cannot be changed. i.e. this code cannot simply be
55			* copied and put under another distribution licence
56			* [including the GNU Public Licence.]
57			*/
58
59			#include <stdio.h>
60			#include <stdlib.h>
61			#include <string.h>
62
63			#include <openssl/err.h>
64			#include <openssl/hmac.h>
65
66			int
67			HMAC_Init_ex(HMAC_CTX ctx, const void key, int len, const EVP_MD *md,
68			ENGINE *impl)
69			{
70			int i, j, reset = 0;
71		371264	unsigned char pad[HMAC_MAX_MD_CBLOCK];
72
73			/* If we are changing MD then we must have a key */
74	✓✓✓✓ ✓✓	440706	if (md != NULL && md != ctx->md && (key == NULL \|\| len < 0))
75		9	return 0;
76
77	✓✓	185623	if (md != NULL) {
78			reset = 1;
79		185530	ctx->md = md;
80	✓✓	185623	} else if (ctx->md != NULL)
81			md = ctx->md;
82			else
83		6	return 0;
84
85	✓✓	185617	if (key != NULL) {
86			reset = 1;
87		185533	j = EVP_MD_block_size(md);
88	✗✓	185533	if ((size_t)j > sizeof(ctx->key)) {
89			EVPerror(EVP_R_BAD_BLOCK_LENGTH);
90			goto err;
91			}
92	✓✓	185533	if (j < len) {
93	✓✗	160	if (!EVP_DigestInit_ex(&ctx->md_ctx, md, impl))
94			goto err;
95	✓✗	160	if (!EVP_DigestUpdate(&ctx->md_ctx, key, len))
96			goto err;
97	✓✗	320	if (!EVP_DigestFinal_ex(&(ctx->md_ctx), ctx->key,
98		160	&ctx->key_length))
99			goto err;
100			} else {
101	✓✗✗✓	370746	if (len < 0 \|\| (size_t)len > sizeof(ctx->key)) {
102			EVPerror(EVP_R_BAD_KEY_LENGTH);
103			goto err;
104			}
105		185373	memcpy(ctx->key, key, len);
106		185373	ctx->key_length = len;
107			}
108	✓✓	185533	if (ctx->key_length != HMAC_MAX_MD_CBLOCK)
109		371042	memset(&ctx->key[ctx->key_length], 0,
110		185521	HMAC_MAX_MD_CBLOCK - ctx->key_length);
111			}
112
113	✓✓	185617	if (reset) {
114	✓✓	47867514	for (i = 0; i < HMAC_MAX_MD_CBLOCK; i++)
115		23748224	pad[i] = 0x36 ^ ctx->key[i];
116	✓✗	185533	if (!EVP_DigestInit_ex(&ctx->i_ctx, md, impl))
117			goto err;
118	✓✗	185533	if (!EVP_DigestUpdate(&ctx->i_ctx, pad, EVP_MD_block_size(md)))
119			goto err;
120
121	✓✓	47867514	for (i = 0; i < HMAC_MAX_MD_CBLOCK; i++)
122		23748224	pad[i] = 0x5c ^ ctx->key[i];
123	✓✗	185533	if (!EVP_DigestInit_ex(&ctx->o_ctx, md, impl))
124			goto err;
125	✓✗	185533	if (!EVP_DigestUpdate(&ctx->o_ctx, pad, EVP_MD_block_size(md)))
126			goto err;
127			}
128	✓✗	185617	if (!EVP_MD_CTX_copy_ex(&ctx->md_ctx, &ctx->i_ctx))
129			goto err;
130		185617	return 1;
131			err:
132			return 0;
133		185632	}
134
135			int
136			HMAC_Init(HMAC_CTX ctx, const void key, int len, const EVP_MD *md)
137			{
138	✓✗	184	if (key && md)
139		92	HMAC_CTX_init(ctx);
140		92	return HMAC_Init_ex(ctx, key, len, md, NULL);
141			}
142
143			int
144			HMAC_Update(HMAC_CTX ctx, const unsigned char data, size_t len)
145			{
146	✓✓	1691812	if (ctx->md == NULL)
147		9	return 0;
148
149		845897	return EVP_DigestUpdate(&ctx->md_ctx, data, len);
150		845906	}
151
152			int
153			HMAC_Final(HMAC_CTX ctx, unsigned char md, unsigned int *len)
154			{
155		1018570	unsigned int i;
156		509285	unsigned char buf[EVP_MAX_MD_SIZE];
157
158	✓✗	509285	if (ctx->md == NULL)
159			goto err;
160
161	✓✗	509285	if (!EVP_DigestFinal_ex(&ctx->md_ctx, buf, &i))
162			goto err;
163	✓✗	509285	if (!EVP_MD_CTX_copy_ex(&ctx->md_ctx, &ctx->o_ctx))
164			goto err;
165	✓✗	509285	if (!EVP_DigestUpdate(&ctx->md_ctx, buf, i))
166			goto err;
167	✓✗	509285	if (!EVP_DigestFinal_ex(&ctx->md_ctx, md, len))
168			goto err;
169		509285	return 1;
170			err:
171			return 0;
172		509285	}
173
174			void
175			HMAC_CTX_init(HMAC_CTX *ctx)
176			{
177		1021192	EVP_MD_CTX_init(&ctx->i_ctx);
178		510596	EVP_MD_CTX_init(&ctx->o_ctx);
179		510596	EVP_MD_CTX_init(&ctx->md_ctx);
180		510596	ctx->md = NULL;
181		510596	}
182
183			int
184			HMAC_CTX_copy(HMAC_CTX dctx, HMAC_CTX sctx)
185			{
186	✓✗	1019124	if (!EVP_MD_CTX_copy(&dctx->i_ctx, &sctx->i_ctx))
187			goto err;
188	✓✗	509562	if (!EVP_MD_CTX_copy(&dctx->o_ctx, &sctx->o_ctx))
189			goto err;
190	✓✗	509562	if (!EVP_MD_CTX_copy(&dctx->md_ctx, &sctx->md_ctx))
191			goto err;
192		509562	memcpy(dctx->key, sctx->key, HMAC_MAX_MD_CBLOCK);
193		509562	dctx->key_length = sctx->key_length;
194		509562	dctx->md = sctx->md;
195		509562	return 1;
196			err:
197			return 0;
198		509562	}
199
200			void
201			HMAC_CTX_cleanup(HMAC_CTX *ctx)
202			{
203		1296382	EVP_MD_CTX_cleanup(&ctx->i_ctx);
204		648191	EVP_MD_CTX_cleanup(&ctx->o_ctx);
205		648191	EVP_MD_CTX_cleanup(&ctx->md_ctx);
206		648191	explicit_bzero(ctx, sizeof(*ctx));
207		648191	}
208
209			unsigned char *
210			HMAC(const EVP_MD evp_md, const void key, int key_len, const unsigned char *d,
211			size_t n, unsigned char md, unsigned int md_len)
212			{
213		136	HMAC_CTX c;
214			static unsigned char m[EVP_MAX_MD_SIZE];
215
216	✓✓	68	if (md == NULL)
217		12	md = m;
218		68	HMAC_CTX_init(&c);
219	✓✗	68	if (!HMAC_Init(&c, key, key_len, evp_md))
220			goto err;
221	✓✗	68	if (!HMAC_Update(&c, d, n))
222			goto err;
223	✓✗	68	if (!HMAC_Final(&c, md, md_len))
224			goto err;
225		68	HMAC_CTX_cleanup(&c);
226		68	return md;
227			err:
228			HMAC_CTX_cleanup(&c);
229			return NULL;
230		68	}
231
232			void
233			HMAC_CTX_set_flags(HMAC_CTX *ctx, unsigned long flags)
234			{
235		370168	EVP_MD_CTX_set_flags(&ctx->i_ctx, flags);
236		185084	EVP_MD_CTX_set_flags(&ctx->o_ctx, flags);
237		185084	EVP_MD_CTX_set_flags(&ctx->md_ctx, flags);
238		185084	}