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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libutil/pkcs5_pbkdf2.c	Lines:	53	56	94.6 %
Date:	2017-11-07	Branches:	15	18	83.3 %


/*	$OpenBSD: pkcs5_pbkdf2.c,v 1.10 2017/04/18 04:06:21 deraadt Exp $	*/

/*-
 * Copyright (c) 2008 Damien Bergamini <damien.bergamini@free.fr>
 *
 * 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 <stdint.h>
#include <stdlib.h>
#include <util.h>

#include <sha1.h>

#define	MINIMUM(a,b) (((a) < (b)) ? (a) : (b))

/*
 * HMAC-SHA-1 (from RFC 2202).
 */
static void
hmac_sha1(const u_int8_t *text, size_t text_len, const u_int8_t *key,
    size_t key_len, u_int8_t digest[SHA1_DIGEST_LENGTH])
{
	SHA1_CTX ctx;
	u_int8_t k_pad[SHA1_BLOCK_LENGTH];
	u_int8_t tk[SHA1_DIGEST_LENGTH];
	int i;

	if (key_len > SHA1_BLOCK_LENGTH) {
		SHA1Init(&ctx);
		SHA1Update(&ctx, key, key_len);
		SHA1Final(tk, &ctx);

		key = tk;
		key_len = SHA1_DIGEST_LENGTH;
	}

	bzero(k_pad, sizeof k_pad);
	bcopy(key, k_pad, key_len);
	for (i = 0; i < SHA1_BLOCK_LENGTH; i++)
		k_pad[i] ^= 0x36;

	SHA1Init(&ctx);
	SHA1Update(&ctx, k_pad, SHA1_BLOCK_LENGTH);
	SHA1Update(&ctx, text, text_len);
	SHA1Final(digest, &ctx);

	bzero(k_pad, sizeof k_pad);
	bcopy(key, k_pad, key_len);
	for (i = 0; i < SHA1_BLOCK_LENGTH; i++)
		k_pad[i] ^= 0x5c;

	SHA1Init(&ctx);
	SHA1Update(&ctx, k_pad, SHA1_BLOCK_LENGTH);
	SHA1Update(&ctx, digest, SHA1_DIGEST_LENGTH);
	SHA1Final(digest, &ctx);
}

/*
 * Password-Based Key Derivation Function 2 (PKCS #5 v2.0).
 * Code based on IEEE Std 802.11-2007, Annex H.4.2.
 */
int
pkcs5_pbkdf2(const char *pass, size_t pass_len, const uint8_t *salt,
    size_t salt_len, uint8_t *key, size_t key_len, unsigned int rounds)
{
	uint8_t *asalt, obuf[SHA1_DIGEST_LENGTH];
	uint8_t d1[SHA1_DIGEST_LENGTH], d2[SHA1_DIGEST_LENGTH];
	unsigned int i, j;
	unsigned int count;
	size_t r;

	if (rounds < 1 || key_len == 0)
		return -1;
	if (salt_len == 0 || salt_len > SIZE_MAX - 4)
		return -1;
	if ((asalt = malloc(salt_len + 4)) == NULL)
		return -1;

	memcpy(asalt, salt, salt_len);

	for (count = 1; key_len > 0; count++) {
		asalt[salt_len + 0] = (count >> 24) & 0xff;
		asalt[salt_len + 1] = (count >> 16) & 0xff;
		asalt[salt_len + 2] = (count >> 8) & 0xff;
		asalt[salt_len + 3] = count & 0xff;
		hmac_sha1(asalt, salt_len + 4, pass, pass_len, d1);
		memcpy(obuf, d1, sizeof(obuf));

		for (i = 1; i < rounds; i++) {
			hmac_sha1(d1, sizeof(d1), pass, pass_len, d2);
			memcpy(d1, d2, sizeof(d1));
			for (j = 0; j < sizeof(obuf); j++)
				obuf[j] ^= d1[j];
		}

		r = MINIMUM(key_len, SHA1_DIGEST_LENGTH);
		memcpy(key, obuf, r);
		key += r;
		key_len -= r;
	};
	freezero(asalt, salt_len + 4);
	explicit_bzero(d1, sizeof(d1));
	explicit_bzero(d2, sizeof(d2));
	explicit_bzero(obuf, sizeof(obuf));

	return 0;
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: pkcs5_pbkdf2.c,v 1.10 2017/04/18 04:06:21 deraadt Exp $ */
2
3			/*-
4			* Copyright (c) 2008 Damien Bergamini <damien.bergamini@free.fr>
5			*
6			* Permission to use, copy, modify, and distribute this software for any
7			* purpose with or without fee is hereby granted, provided that the above
8			* copyright notice and this permission notice appear in all copies.
9			*
10			* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11			* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12			* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13			* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14			* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15			* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16			* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17			*/
18
19			#include <sys/types.h>
20
21			#include <string.h>
22			#include <stdint.h>
23			#include <stdlib.h>
24			#include <util.h>
25
26			#include <sha1.h>
27
28			#define MINIMUM(a,b) (((a) < (b)) ? (a) : (b))
29
30			/*
31			* HMAC-SHA-1 (from RFC 2202).
32			*/
33			static void
34			hmac_sha1(const u_int8_t text, size_t text_len, const u_int8_t key,
35			size_t key_len, u_int8_t digest[SHA1_DIGEST_LENGTH])
36			{
37		438960	SHA1_CTX ctx;
38		219480	u_int8_t k_pad[SHA1_BLOCK_LENGTH];
39		219480	u_int8_t tk[SHA1_DIGEST_LENGTH];
40			int i;
41
42	✓✓	219480	if (key_len > SHA1_BLOCK_LENGTH) {
43		72000	SHA1Init(&ctx);
44		72000	SHA1Update(&ctx, key, key_len);
45		72000	SHA1Final(tk, &ctx);
46
47			key = tk;
48			key_len = SHA1_DIGEST_LENGTH;
49		72000	}
50
51		219480	bzero(k_pad, sizeof k_pad);
52		219480	bcopy(key, k_pad, key_len);
53	✓✓	28532400	for (i = 0; i < SHA1_BLOCK_LENGTH; i++)
54		14046720	k_pad[i] ^= 0x36;
55
56		219480	SHA1Init(&ctx);
57		219480	SHA1Update(&ctx, k_pad, SHA1_BLOCK_LENGTH);
58		219480	SHA1Update(&ctx, text, text_len);
59		219480	SHA1Final(digest, &ctx);
60
61		219480	bzero(k_pad, sizeof k_pad);
62		219480	bcopy(key, k_pad, key_len);
63	✓✓	28532400	for (i = 0; i < SHA1_BLOCK_LENGTH; i++)
64		14046720	k_pad[i] ^= 0x5c;
65
66		219480	SHA1Init(&ctx);
67		219480	SHA1Update(&ctx, k_pad, SHA1_BLOCK_LENGTH);
68		219480	SHA1Update(&ctx, digest, SHA1_DIGEST_LENGTH);
69		219480	SHA1Final(digest, &ctx);
70		219480	}
71
72			/*
73			* Password-Based Key Derivation Function 2 (PKCS #5 v2.0).
74			* Code based on IEEE Std 802.11-2007, Annex H.4.2.
75			*/
76			int
77			pkcs5_pbkdf2(const char pass, size_t pass_len, const uint8_t salt,
78			size_t salt_len, uint8_t *key, size_t key_len, unsigned int rounds)
79			{
80		616	uint8_t *asalt, obuf[SHA1_DIGEST_LENGTH];
81		308	uint8_t d1[SHA1_DIGEST_LENGTH], d2[SHA1_DIGEST_LENGTH];
82			unsigned int i, j;
83			unsigned int count;
84			size_t r;
85
86	✗✓	308	if (rounds < 1 \|\| key_len == 0)
87			return -1;
88	✗✓	308	if (salt_len == 0 \|\| salt_len > SIZE_MAX - 4)
89			return -1;
90	✗✓	308	if ((asalt = malloc(salt_len + 4)) == NULL)
91			return -1;
92
93		308	memcpy(asalt, salt, salt_len);
94
95	✓✓	1456	for (count = 1; key_len > 0; count++) {
96		420	asalt[salt_len + 0] = (count >> 24) & 0xff;
97		420	asalt[salt_len + 1] = (count >> 16) & 0xff;
98		420	asalt[salt_len + 2] = (count >> 8) & 0xff;
99		420	asalt[salt_len + 3] = count & 0xff;
100		420	hmac_sha1(asalt, salt_len + 4, pass, pass_len, d1);
101		420	memcpy(obuf, d1, sizeof(obuf));
102
103	✓✓	438960	for (i = 1; i < rounds; i++) {
104		219060	hmac_sha1(d1, sizeof(d1), pass, pass_len, d2);
105		219060	memcpy(d1, d2, sizeof(d1));
106	✓✓	9200520	for (j = 0; j < sizeof(obuf); j++)
107		4381200	obuf[j] ^= d1[j];
108			}
109
110		420	r = MINIMUM(key_len, SHA1_DIGEST_LENGTH);
111		420	memcpy(key, obuf, r);
112		420	key += r;
113		420	key_len -= r;
114			};
115		308	freezero(asalt, salt_len + 4);
116		308	explicit_bzero(d1, sizeof(d1));
117		308	explicit_bzero(d2, sizeof(d2));
118		308	explicit_bzero(obuf, sizeof(obuf));
119
120		308	return 0;
121		308	}