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
30 * HMAC-SHA-1 (from RFC 2202).
33 hmac_sha1(const guchar *text, size_t text_len, const guchar *key,
34 size_t key_len, guchar *digest)
37 gssize digestlen = g_checksum_type_get_length(G_CHECKSUM_SHA1);
39 guchar k_pad[CHECKSUM_BLOCKLEN];
43 if (key_len > CHECKSUM_BLOCKLEN) {
44 cksum = g_checksum_new(G_CHECKSUM_SHA1);
45 g_checksum_update(cksum, key, key_len);
47 g_checksum_get_digest(cksum, tk, &outlen);
48 g_checksum_free(cksum);
54 bzero(k_pad, sizeof k_pad);
55 bcopy(key, k_pad, key_len);
56 for (i = 0; i < CHECKSUM_BLOCKLEN; i++)
59 cksum = g_checksum_new(G_CHECKSUM_SHA1);
60 g_checksum_update(cksum, k_pad, CHECKSUM_BLOCKLEN);
61 g_checksum_update(cksum, text, text_len);
63 g_checksum_get_digest(cksum, digest, &outlen);
64 g_checksum_free(cksum);
66 bzero(k_pad, sizeof k_pad);
67 bcopy(key, k_pad, key_len);
68 for (i = 0; i < CHECKSUM_BLOCKLEN; i++)
71 cksum = g_checksum_new(G_CHECKSUM_SHA1);
72 g_checksum_update(cksum, k_pad, CHECKSUM_BLOCKLEN);
73 g_checksum_update(cksum, digest, digestlen);
75 g_checksum_get_digest(cksum, digest, &outlen);
76 g_checksum_free(cksum);
79 #undef CHECKSUM_BLOCKLEN
82 * Password-Based Key Derivation Function 2 (PKCS #5 v2.0).
83 * Code based on IEEE Std 802.11-2007, Annex H.4.2.
86 pkcs5_pbkdf2(const gchar *pass, size_t pass_len, const guchar *salt,
87 size_t salt_len, guchar *key, size_t key_len, guint rounds)
89 gssize digestlen = g_checksum_type_get_length(G_CHECKSUM_SHA1);
90 guchar *asalt, obuf[digestlen];
91 guchar d1[digestlen], d2[digestlen];
96 if (rounds < 1 || key_len == 0)
98 if (salt_len == 0 || salt_len > SIZE_MAX - 4)
100 if ((asalt = malloc(salt_len + 4)) == NULL)
103 memcpy(asalt, salt, salt_len);
105 for (count = 1; key_len > 0; count++) {
106 asalt[salt_len + 0] = (count >> 24) & 0xff;
107 asalt[salt_len + 1] = (count >> 16) & 0xff;
108 asalt[salt_len + 2] = (count >> 8) & 0xff;
109 asalt[salt_len + 3] = count & 0xff;
110 hmac_sha1(asalt, salt_len + 4, pass, pass_len, d1);
111 memcpy(obuf, d1, sizeof(obuf));
113 for (i = 1; i < rounds; i++) {
114 hmac_sha1(d1, sizeof(d1), pass, pass_len, d2);
115 memcpy(d1, d2, sizeof(d1));
116 for (j = 0; j < sizeof(obuf); j++)
120 r = MIN(key_len, digestlen);
121 memcpy(key, obuf, r);
125 bzero(asalt, salt_len + 4);
127 bzero(d1, sizeof(d1));
128 bzero(d2, sizeof(d2));
129 bzero(obuf, sizeof(obuf));