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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.bin/ssh/lib/../hmac.c	Lines:	0	50	0.0 %
Date:	2017-11-13	Branches:	0	40	0.0 %


/* $OpenBSD: hmac.c,v 1.12 2015/03/24 20:03:44 markus Exp $ */
/*
 * Copyright (c) 2014 Markus Friedl.  All rights reserved.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>
#include <string.h>

#include "sshbuf.h"
#include "digest.h"
#include "hmac.h"

struct ssh_hmac_ctx {
	int			 alg;
	struct ssh_digest_ctx	*ictx;
	struct ssh_digest_ctx	*octx;
	struct ssh_digest_ctx	*digest;
	u_char			*buf;
	size_t			 buf_len;
};

size_t
ssh_hmac_bytes(int alg)
{
	return ssh_digest_bytes(alg);
}

struct ssh_hmac_ctx *
ssh_hmac_start(int alg)
{
	struct ssh_hmac_ctx	*ret;

	if ((ret = calloc(1, sizeof(*ret))) == NULL)
		return NULL;
	ret->alg = alg;
	if ((ret->ictx = ssh_digest_start(alg)) == NULL ||
	    (ret->octx = ssh_digest_start(alg)) == NULL ||
	    (ret->digest = ssh_digest_start(alg)) == NULL)
		goto fail;
	ret->buf_len = ssh_digest_blocksize(ret->ictx);
	if ((ret->buf = calloc(1, ret->buf_len)) == NULL)
		goto fail;
	return ret;
fail:
	ssh_hmac_free(ret);
	return NULL;
}

int
ssh_hmac_init(struct ssh_hmac_ctx *ctx, const void *key, size_t klen)
{
	size_t i;

	/* reset ictx and octx if no is key given */
	if (key != NULL) {
		/* truncate long keys */
		if (klen <= ctx->buf_len)
			memcpy(ctx->buf, key, klen);
		else if (ssh_digest_memory(ctx->alg, key, klen, ctx->buf,
		    ctx->buf_len) < 0)
			return -1;
		for (i = 0; i < ctx->buf_len; i++)
			ctx->buf[i] ^= 0x36;
		if (ssh_digest_update(ctx->ictx, ctx->buf, ctx->buf_len) < 0)
			return -1;
		for (i = 0; i < ctx->buf_len; i++)
			ctx->buf[i] ^= 0x36 ^ 0x5c;
		if (ssh_digest_update(ctx->octx, ctx->buf, ctx->buf_len) < 0)
			return -1;
		explicit_bzero(ctx->buf, ctx->buf_len);
	}
	/* start with ictx */
	if (ssh_digest_copy_state(ctx->ictx, ctx->digest) < 0)
		return -1;
	return 0;
}

int
ssh_hmac_update(struct ssh_hmac_ctx *ctx, const void *m, size_t mlen)
{
	return ssh_digest_update(ctx->digest, m, mlen);
}

int
ssh_hmac_update_buffer(struct ssh_hmac_ctx *ctx, const struct sshbuf *b)
{
	return ssh_digest_update_buffer(ctx->digest, b);
}

int
ssh_hmac_final(struct ssh_hmac_ctx *ctx, u_char *d, size_t dlen)
{
	size_t len;

	len = ssh_digest_bytes(ctx->alg);
	if (dlen < len ||
	    ssh_digest_final(ctx->digest, ctx->buf, len))
		return -1;
	/* switch to octx */
	if (ssh_digest_copy_state(ctx->octx, ctx->digest) < 0 ||
	    ssh_digest_update(ctx->digest, ctx->buf, len) < 0 ||
	    ssh_digest_final(ctx->digest, d, dlen) < 0)
		return -1;
	return 0;
}

void
ssh_hmac_free(struct ssh_hmac_ctx *ctx)
{
	if (ctx != NULL) {
		ssh_digest_free(ctx->ictx);
		ssh_digest_free(ctx->octx);
		ssh_digest_free(ctx->digest);
		if (ctx->buf) {
			explicit_bzero(ctx->buf, ctx->buf_len);
			free(ctx->buf);
		}
		explicit_bzero(ctx, sizeof(*ctx));
		free(ctx);
	}
}

#ifdef TEST

/* cc -DTEST hmac.c digest.c buffer.c cleanup.c fatal.c log.c xmalloc.c -lcrypto */
static void
hmac_test(void *key, size_t klen, void *m, size_t mlen, u_char *e, size_t elen)
{
	struct ssh_hmac_ctx	*ctx;
	size_t			 i;
	u_char			 digest[16];

	if ((ctx = ssh_hmac_start(SSH_DIGEST_MD5)) == NULL)
		printf("ssh_hmac_start failed");
	if (ssh_hmac_init(ctx, key, klen) < 0 ||
	    ssh_hmac_update(ctx, m, mlen) < 0 ||
	    ssh_hmac_final(ctx, digest, sizeof(digest)) < 0)
		printf("ssh_hmac_xxx failed");
	ssh_hmac_free(ctx);

	if (memcmp(e, digest, elen)) {
		for (i = 0; i < elen; i++)
			printf("[%zu] %2.2x %2.2x\n", i, e[i], digest[i]);
		printf("mismatch\n");
	} else
		printf("ok\n");
}

int
main(int argc, char **argv)
{
	/* try test vectors from RFC 2104 */

	u_char key1[16] = {
	    0xb, 0xb, 0xb, 0xb, 0xb, 0xb, 0xb, 0xb,
	    0xb, 0xb, 0xb, 0xb, 0xb, 0xb, 0xb, 0xb };
	u_char *data1 = "Hi There";
	u_char dig1[16] = {
	    0x92, 0x94, 0x72, 0x7a, 0x36, 0x38, 0xbb, 0x1c,
	    0x13, 0xf4, 0x8e, 0xf8, 0x15, 0x8b, 0xfc, 0x9d };

	u_char *key2 = "Jefe";
	u_char *data2 = "what do ya want for nothing?";
	u_char dig2[16] = {
	    0x75, 0x0c, 0x78, 0x3e, 0x6a, 0xb0, 0xb5, 0x03,
	    0xea, 0xa8, 0x6e, 0x31, 0x0a, 0x5d, 0xb7, 0x38 };

	u_char key3[16];
	u_char data3[50];
	u_char dig3[16] = {
	    0x56, 0xbe, 0x34, 0x52, 0x1d, 0x14, 0x4c, 0x88,
	    0xdb, 0xb8, 0xc7, 0x33, 0xf0, 0xe8, 0xb3, 0xf6 };
	memset(key3, 0xaa, sizeof(key3));
	memset(data3, 0xdd, sizeof(data3));

	hmac_test(key1, sizeof(key1), data1, strlen(data1), dig1, sizeof(dig1));
	hmac_test(key2, strlen(key2), data2, strlen(data2), dig2, sizeof(dig2));
	hmac_test(key3, sizeof(key3), data3, sizeof(data3), dig3, sizeof(dig3));

	return 0;
}

#endif


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: hmac.c,v 1.12 2015/03/24 20:03:44 markus Exp $ */
2			/*
3			* Copyright (c) 2014 Markus Friedl. All rights reserved.
4			*
5			* Permission to use, copy, modify, and distribute this software for any
6			* purpose with or without fee is hereby granted, provided that the above
7			* copyright notice and this permission notice appear in all copies.
8			*
9			* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10			* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11			* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12			* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13			* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14			* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15			* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16			*/
17
18			#include <sys/types.h>
19			#include <string.h>
20
21			#include "sshbuf.h"
22			#include "digest.h"
23			#include "hmac.h"
24
25			struct ssh_hmac_ctx {
26			int alg;
27			struct ssh_digest_ctx *ictx;
28			struct ssh_digest_ctx *octx;
29			struct ssh_digest_ctx *digest;
30			u_char *buf;
31			size_t buf_len;
32			};
33
34			size_t
35			ssh_hmac_bytes(int alg)
36			{
37			return ssh_digest_bytes(alg);
38			}
39
40			struct ssh_hmac_ctx *
41			ssh_hmac_start(int alg)
42			{
43			struct ssh_hmac_ctx *ret;
44
45			if ((ret = calloc(1, sizeof(*ret))) == NULL)
46			return NULL;
47			ret->alg = alg;
48			if ((ret->ictx = ssh_digest_start(alg)) == NULL \|\|
49			(ret->octx = ssh_digest_start(alg)) == NULL \|\|
50			(ret->digest = ssh_digest_start(alg)) == NULL)
51			goto fail;
52			ret->buf_len = ssh_digest_blocksize(ret->ictx);
53			if ((ret->buf = calloc(1, ret->buf_len)) == NULL)
54			goto fail;
55			return ret;
56			fail:
57			ssh_hmac_free(ret);
58			return NULL;
59			}
60
61			int
62			ssh_hmac_init(struct ssh_hmac_ctx ctx, const void key, size_t klen)
63			{
64			size_t i;
65
66			/* reset ictx and octx if no is key given */
67			if (key != NULL) {
68			/* truncate long keys */
69			if (klen <= ctx->buf_len)
70			memcpy(ctx->buf, key, klen);
71			else if (ssh_digest_memory(ctx->alg, key, klen, ctx->buf,
72			ctx->buf_len) < 0)
73			return -1;
74			for (i = 0; i < ctx->buf_len; i++)
75			ctx->buf[i] ^= 0x36;
76			if (ssh_digest_update(ctx->ictx, ctx->buf, ctx->buf_len) < 0)
77			return -1;
78			for (i = 0; i < ctx->buf_len; i++)
79			ctx->buf[i] ^= 0x36 ^ 0x5c;
80			if (ssh_digest_update(ctx->octx, ctx->buf, ctx->buf_len) < 0)
81			return -1;
82			explicit_bzero(ctx->buf, ctx->buf_len);
83			}
84			/* start with ictx */
85			if (ssh_digest_copy_state(ctx->ictx, ctx->digest) < 0)
86			return -1;
87			return 0;
88			}
89
90			int
91			ssh_hmac_update(struct ssh_hmac_ctx ctx, const void m, size_t mlen)
92			{
93			return ssh_digest_update(ctx->digest, m, mlen);
94			}
95
96			int
97			ssh_hmac_update_buffer(struct ssh_hmac_ctx ctx, const struct sshbuf b)
98			{
99			return ssh_digest_update_buffer(ctx->digest, b);
100			}
101
102			int
103			ssh_hmac_final(struct ssh_hmac_ctx ctx, u_char d, size_t dlen)
104			{
105			size_t len;
106
107			len = ssh_digest_bytes(ctx->alg);
108			if (dlen < len \|\|
109			ssh_digest_final(ctx->digest, ctx->buf, len))
110			return -1;
111			/* switch to octx */
112			if (ssh_digest_copy_state(ctx->octx, ctx->digest) < 0 \|\|
113			ssh_digest_update(ctx->digest, ctx->buf, len) < 0 \|\|
114			ssh_digest_final(ctx->digest, d, dlen) < 0)
115			return -1;
116			return 0;
117			}
118
119			void
120			ssh_hmac_free(struct ssh_hmac_ctx *ctx)
121			{
122			if (ctx != NULL) {
123			ssh_digest_free(ctx->ictx);
124			ssh_digest_free(ctx->octx);
125			ssh_digest_free(ctx->digest);
126			if (ctx->buf) {
127			explicit_bzero(ctx->buf, ctx->buf_len);
128			free(ctx->buf);
129			}
130			explicit_bzero(ctx, sizeof(*ctx));
131			free(ctx);
132			}
133			}
134
135			#ifdef TEST
136
137			/* cc -DTEST hmac.c digest.c buffer.c cleanup.c fatal.c log.c xmalloc.c -lcrypto */
138			static void
139			hmac_test(void key, size_t klen, void m, size_t mlen, u_char *e, size_t elen)
140			{
141			struct ssh_hmac_ctx *ctx;
142			size_t i;
143			u_char digest[16];
144
145			if ((ctx = ssh_hmac_start(SSH_DIGEST_MD5)) == NULL)
146			printf("ssh_hmac_start failed");
147			if (ssh_hmac_init(ctx, key, klen) < 0 \|\|
148			ssh_hmac_update(ctx, m, mlen) < 0 \|\|
149			ssh_hmac_final(ctx, digest, sizeof(digest)) < 0)
150			printf("ssh_hmac_xxx failed");
151			ssh_hmac_free(ctx);
152
153			if (memcmp(e, digest, elen)) {
154			for (i = 0; i < elen; i++)
155			printf("[%zu] %2.2x %2.2x\n", i, e[i], digest[i]);
156			printf("mismatch\n");
157			} else
158			printf("ok\n");
159			}
160
161			int
162			main(int argc, char **argv)
163			{
164			/* try test vectors from RFC 2104 */
165
166			u_char key1[16] = {
167			0xb, 0xb, 0xb, 0xb, 0xb, 0xb, 0xb, 0xb,
168			0xb, 0xb, 0xb, 0xb, 0xb, 0xb, 0xb, 0xb };
169			u_char *data1 = "Hi There";
170			u_char dig1[16] = {
171			0x92, 0x94, 0x72, 0x7a, 0x36, 0x38, 0xbb, 0x1c,
172			0x13, 0xf4, 0x8e, 0xf8, 0x15, 0x8b, 0xfc, 0x9d };
173
174			u_char *key2 = "Jefe";
175			u_char *data2 = "what do ya want for nothing?";
176			u_char dig2[16] = {
177			0x75, 0x0c, 0x78, 0x3e, 0x6a, 0xb0, 0xb5, 0x03,
178			0xea, 0xa8, 0x6e, 0x31, 0x0a, 0x5d, 0xb7, 0x38 };
179
180			u_char key3[16];
181			u_char data3[50];
182			u_char dig3[16] = {
183			0x56, 0xbe, 0x34, 0x52, 0x1d, 0x14, 0x4c, 0x88,
184			0xdb, 0xb8, 0xc7, 0x33, 0xf0, 0xe8, 0xb3, 0xf6 };
185			memset(key3, 0xaa, sizeof(key3));
186			memset(data3, 0xdd, sizeof(data3));
187
188			hmac_test(key1, sizeof(key1), data1, strlen(data1), dig1, sizeof(dig1));
189			hmac_test(key2, strlen(key2), data2, strlen(data2), dig2, sizeof(dig2));
190			hmac_test(key3, sizeof(key3), data3, sizeof(data3), dig3, sizeof(dig3));
191
192			return 0;
193			}
194
195			#endif