136 lines
3.7 KiB
C
136 lines
3.7 KiB
C
/* pkcs5_pbkdf2.c - Password-Based Key Derivation Function 2
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* Copyright (c) 2008 Damien Bergamini <damien.bergamini@free.fr>
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*
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* Modifications for Claws Mail are:
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* Copyright (c) 2016 the Claws Mail team
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <glib.h>
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#include <sys/types.h>
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#include <string.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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#define CHECKSUM_BLOCKLEN 64
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#define SHA1_DIGESTLEN 20
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/*
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* HMAC-SHA-1 (from RFC 2202).
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*/
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static void
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hmac_sha1(const guchar *text, size_t text_len, const guchar *key,
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size_t key_len, guchar *digest)
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{
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GChecksum *cksum;
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gsize outlen;
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guchar k_pad[CHECKSUM_BLOCKLEN];
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guchar tk[SHA1_DIGESTLEN];
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gint i;
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if (key_len > CHECKSUM_BLOCKLEN) {
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cksum = g_checksum_new(G_CHECKSUM_SHA1);
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g_checksum_update(cksum, key, key_len);
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outlen = SHA1_DIGESTLEN;
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g_checksum_get_digest(cksum, tk, &outlen);
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g_checksum_free(cksum);
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key = tk;
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key_len = SHA1_DIGESTLEN;
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}
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memset(k_pad, 0, sizeof k_pad);
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memcpy(k_pad, key, key_len);
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for (i = 0; i < CHECKSUM_BLOCKLEN; i++)
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k_pad[i] ^= 0x36;
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cksum = g_checksum_new(G_CHECKSUM_SHA1);
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g_checksum_update(cksum, k_pad, CHECKSUM_BLOCKLEN);
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g_checksum_update(cksum, text, text_len);
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outlen = SHA1_DIGESTLEN;
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g_checksum_get_digest(cksum, digest, &outlen);
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g_checksum_free(cksum);
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memset(k_pad, 0, sizeof k_pad);
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memcpy(k_pad, key, key_len);
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for (i = 0; i < CHECKSUM_BLOCKLEN; i++)
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k_pad[i] ^= 0x5c;
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cksum = g_checksum_new(G_CHECKSUM_SHA1);
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g_checksum_update(cksum, k_pad, CHECKSUM_BLOCKLEN);
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g_checksum_update(cksum, digest, SHA1_DIGESTLEN);
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outlen = SHA1_DIGESTLEN;
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g_checksum_get_digest(cksum, digest, &outlen);
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g_checksum_free(cksum);
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}
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#undef CHECKSUM_BLOCKLEN
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/*
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* Password-Based Key Derivation Function 2 (PKCS #5 v2.0).
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* Code based on IEEE Std 802.11-2007, Annex H.4.2.
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*/
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gint
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pkcs5_pbkdf2(const gchar *pass, size_t pass_len, const guchar *salt,
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size_t salt_len, guchar *key, size_t key_len, guint rounds)
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{
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guchar *asalt, obuf[SHA1_DIGESTLEN];
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guchar d1[SHA1_DIGESTLEN], d2[SHA1_DIGESTLEN];
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guint i, j;
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guint count;
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size_t r;
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if (pass == NULL || salt == NULL || key == NULL)
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return -1;
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if (rounds < 1 || key_len == 0)
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return -1;
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if (salt_len == 0 || salt_len > SIZE_MAX - 4)
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return -1;
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if ((asalt = malloc(salt_len + 4)) == NULL)
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return -1;
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memcpy(asalt, salt, salt_len);
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for (count = 1; key_len > 0; count++) {
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asalt[salt_len + 0] = (count >> 24) & 0xff;
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asalt[salt_len + 1] = (count >> 16) & 0xff;
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asalt[salt_len + 2] = (count >> 8) & 0xff;
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asalt[salt_len + 3] = count & 0xff;
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hmac_sha1(asalt, salt_len + 4, pass, pass_len, d1);
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memcpy(obuf, d1, sizeof(obuf));
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for (i = 1; i < rounds; i++) {
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hmac_sha1(d1, sizeof(d1), pass, pass_len, d2);
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memcpy(d1, d2, sizeof(d1));
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for (j = 0; j < sizeof(obuf); j++)
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obuf[j] ^= d1[j];
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}
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r = MIN(key_len, SHA1_DIGESTLEN);
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memcpy(key, obuf, r);
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key += r;
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key_len -= r;
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};
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memset(asalt, 0, salt_len + 4);
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free(asalt);
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memset(d1, 0, sizeof(d1));
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memset(d2, 0, sizeof(d2));
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memset(obuf, 0, sizeof(obuf));
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return 0;
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}
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#undef SHA1_DIGESTLEN
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