1 /* pkcs5_pbkdf2.c - Password-Based Key Derivation Function 2
2 * Copyright (c) 2008 Damien Bergamini <damien.bergamini@free.fr>
4 * Modifications for Claws Mail are:
5 * Copyright (c) 2016 the Claws Mail team
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
21 #include <sys/types.h>
28 #define CHECKSUM_BLOCKLEN 64
29 #define SHA1_DIGESTLEN 20
32 * HMAC-SHA-1 (from RFC 2202).
35 hmac_sha1(const guchar *text, size_t text_len, const guchar *key,
36 size_t key_len, guchar *digest)
40 guchar k_pad[CHECKSUM_BLOCKLEN];
41 guchar tk[SHA1_DIGESTLEN];
44 if (key_len > CHECKSUM_BLOCKLEN) {
45 cksum = g_checksum_new(G_CHECKSUM_SHA1);
46 g_checksum_update(cksum, key, key_len);
47 outlen = SHA1_DIGESTLEN;
48 g_checksum_get_digest(cksum, tk, &outlen);
49 g_checksum_free(cksum);
52 key_len = SHA1_DIGESTLEN;
55 memset(k_pad, 0, sizeof k_pad);
56 memcpy(k_pad, key, key_len);
57 for (i = 0; i < CHECKSUM_BLOCKLEN; i++)
60 cksum = g_checksum_new(G_CHECKSUM_SHA1);
61 g_checksum_update(cksum, k_pad, CHECKSUM_BLOCKLEN);
62 g_checksum_update(cksum, text, text_len);
63 outlen = SHA1_DIGESTLEN;
64 g_checksum_get_digest(cksum, digest, &outlen);
65 g_checksum_free(cksum);
67 memset(k_pad, 0, sizeof k_pad);
68 memcpy(k_pad, key, key_len);
69 for (i = 0; i < CHECKSUM_BLOCKLEN; i++)
72 cksum = g_checksum_new(G_CHECKSUM_SHA1);
73 g_checksum_update(cksum, k_pad, CHECKSUM_BLOCKLEN);
74 g_checksum_update(cksum, digest, SHA1_DIGESTLEN);
75 outlen = SHA1_DIGESTLEN;
76 g_checksum_get_digest(cksum, digest, &outlen);
77 g_checksum_free(cksum);
80 #undef CHECKSUM_BLOCKLEN
83 * Password-Based Key Derivation Function 2 (PKCS #5 v2.0).
84 * Code based on IEEE Std 802.11-2007, Annex H.4.2.
87 pkcs5_pbkdf2(const gchar *pass, size_t pass_len, const guchar *salt,
88 size_t salt_len, guchar *key, size_t key_len, guint rounds)
90 guchar *asalt, obuf[SHA1_DIGESTLEN];
91 guchar d1[SHA1_DIGESTLEN], d2[SHA1_DIGESTLEN];
96 if (pass == NULL || salt == NULL || key == NULL)
98 if (rounds < 1 || key_len == 0)
100 if (salt_len == 0 || salt_len > SIZE_MAX - 4)
102 if ((asalt = malloc(salt_len + 4)) == NULL)
105 memcpy(asalt, salt, salt_len);
107 for (count = 1; key_len > 0; count++) {
108 asalt[salt_len + 0] = (count >> 24) & 0xff;
109 asalt[salt_len + 1] = (count >> 16) & 0xff;
110 asalt[salt_len + 2] = (count >> 8) & 0xff;
111 asalt[salt_len + 3] = count & 0xff;
112 hmac_sha1(asalt, salt_len + 4, pass, pass_len, d1);
113 memcpy(obuf, d1, sizeof(obuf));
115 for (i = 1; i < rounds; i++) {
116 hmac_sha1(d1, sizeof(d1), pass, pass_len, d2);
117 memcpy(d1, d2, sizeof(d1));
118 for (j = 0; j < sizeof(obuf); j++)
122 r = MIN(key_len, SHA1_DIGESTLEN);
123 memcpy(key, obuf, r);
127 memset(asalt, 0, salt_len + 4);
129 memset(d1, 0, sizeof(d1));
130 memset(d2, 0, sizeof(d2));
131 memset(obuf, 0, sizeof(obuf));
136 #undef SHA1_DIGESTLEN