kaz-vagrant/files/clawsmail/genpasswd.c
2022-11-30 19:43:06 +01:00

334 lines
8.6 KiB
C

/* customized from claws mail source code */
/* pkcs5_pbkdf2.c - Password-Based Key Derivation Function 2
* Copyright (c) 2008 Damien Bergamini <damien.bergamini@free.fr>
*
* Modifications for Claws Mail are:
* Copyright (c) 2016 the Claws Mail team
*
* 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.
*/
/*
* Claws Mail -- a GTK+ based, lightweight, and fast e-mail client
* Copyright (C) 2016 The Claws Mail Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <glib.h>
#include <sys/types.h>
#include <string.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#define CHECKSUM_BLOCKLEN 64
/*
* HMAC-SHA-1 (from RFC 2202).
*/
static void
hmac_sha1(const guchar *text, size_t text_len, const guchar *key,
size_t key_len, guchar *digest)
{
GChecksum *cksum;
gssize digestlen = g_checksum_type_get_length(G_CHECKSUM_SHA1);
gsize outlen;
guchar k_pad[CHECKSUM_BLOCKLEN];
guchar tk[digestlen];
gint i;
if (key_len > CHECKSUM_BLOCKLEN) {
cksum = g_checksum_new(G_CHECKSUM_SHA1);
g_checksum_update(cksum, key, key_len);
outlen = digestlen;
g_checksum_get_digest(cksum, tk, &outlen);
g_checksum_free(cksum);
key = tk;
key_len = digestlen;
}
memset(k_pad, 0, sizeof k_pad);
memcpy(k_pad, key, key_len);
for (i = 0; i < CHECKSUM_BLOCKLEN; i++)
k_pad[i] ^= 0x36;
cksum = g_checksum_new(G_CHECKSUM_SHA1);
g_checksum_update(cksum, k_pad, CHECKSUM_BLOCKLEN);
g_checksum_update(cksum, text, text_len);
outlen = digestlen;
g_checksum_get_digest(cksum, digest, &outlen);
g_checksum_free(cksum);
memset(k_pad, 0, sizeof k_pad);
memcpy(k_pad, key, key_len);
for (i = 0; i < CHECKSUM_BLOCKLEN; i++)
k_pad[i] ^= 0x5c;
cksum = g_checksum_new(G_CHECKSUM_SHA1);
g_checksum_update(cksum, k_pad, CHECKSUM_BLOCKLEN);
g_checksum_update(cksum, digest, digestlen);
outlen = digestlen;
g_checksum_get_digest(cksum, digest, &outlen);
g_checksum_free(cksum);
}
#undef CHECKSUM_BLOCKLEN
/*
* Password-Based Key Derivation Function 2 (PKCS #5 v2.0).
* Code based on IEEE Std 802.11-2007, Annex H.4.2.
*/
gint
pkcs5_pbkdf2(const gchar *pass, size_t pass_len, const guchar *salt,
size_t salt_len, guchar *key, size_t key_len, guint rounds)
{
gssize digestlen = g_checksum_type_get_length(G_CHECKSUM_SHA1);
guchar *asalt, obuf[digestlen];
guchar d1[digestlen], d2[digestlen];
guint i, j;
guint count;
size_t r;
if (pass == NULL || salt == NULL || key == NULL)
return -1;
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 = MIN(key_len, digestlen);
memcpy(key, obuf, r);
key += r;
key_len -= r;
};
memset(asalt, 0, salt_len + 4);
free(asalt);
memset(d1, 0, sizeof(d1));
memset(d2, 0, sizeof(d2));
memset(obuf, 0, sizeof(obuf));
return 0;
}
//
# include <gnutls/gnutls.h>
# include <gnutls/crypto.h>
#include <glib.h>
#include <glib/gi18n.h>
#include <stdlib.h>
/* Length of stored key derivation, before base64. */
#define KD_LENGTH 64
/* Length of randomly generated and saved salt, used for key derivation.
* Also before base64. */
#define KD_SALT_LENGTH 64
char* monsalt;
int get_random_bytes(char* dst, int len) {
return 1;
}
static void _generate_salt()
{
guchar salt[KD_SALT_LENGTH];
if (!get_random_bytes(salt, KD_SALT_LENGTH)) {
printf("Could not get random bytes for kd salt.\n");
return;
}
monsalt = g_base64_encode(salt, KD_SALT_LENGTH);
}
#undef KD_SALT_LENGTH
static guchar *_make_key_deriv(const gchar *passphrase, guint rounds,
guint length)
{
guchar *kd, *salt;
gchar *saltpref = "uO5gxcSFnCOAN3ESLXOZyqoz3aJemnEKsaaxqPtD5zyrigsCfpqE7ahXNY4N9A3qnEIBv/3PAqxeTUq9VrKr9g==";
gsize saltlen;
gint ret;
/* Grab our salt, generating and saving a new random one if needed. */
if (saltpref == NULL || strlen(saltpref) == 0) {
_generate_salt();
saltpref = "uO5gxcSFnCOAN3ESLXOZyqoz3aJemnEKsaaxqPtD5zyrigsCfpqE7ahXNY4N9A3qnEIBv/3PAqxeTUq9VrKr9g==";
}
salt = g_base64_decode(saltpref, &saltlen);
kd = g_malloc0(length);
//START_TIMING("PBKDF2");
ret = pkcs5_pbkdf2(passphrase, strlen(passphrase), salt, saltlen,
kd, length, rounds);
//END_TIMING();
g_free(salt);
if (ret == 0) {
return kd;
}
g_free(kd);
return NULL;
}
#define BUFSIZE 128
#define IVLEN 16
gchar *password_encrypt_gnutls(const gchar *password,
const gchar *encryption_passphrase)
{
gnutls_cipher_algorithm_t algo = GNUTLS_CIPHER_AES_256_CBC;
gnutls_cipher_hd_t handle;
gnutls_datum_t key, iv;
int keylen, blocklen, ret, len, i;
unsigned char *buf, *encbuf, *base, *output;
guint rounds = 5000;
g_return_val_if_fail(password != NULL, NULL);
g_return_val_if_fail(encryption_passphrase != NULL, NULL);
/* ivlen = gnutls_cipher_get_iv_size(algo);*/
keylen = gnutls_cipher_get_key_size(algo);
blocklen = gnutls_cipher_get_block_size(algo);
/* digestlen = gnutls_hash_get_len(digest); */
/* Take the passphrase and compute a key derivation of suitable
* length to be used as encryption key for our block cipher. */
key.data = _make_key_deriv(encryption_passphrase, rounds, keylen);
key.size = keylen;
/* Prepare random IV for cipher */
iv.data = malloc(IVLEN);
iv.size = IVLEN;
if (!get_random_bytes(iv.data, IVLEN)) {
g_free(key.data);
g_free(iv.data);
return NULL;
}
/* Initialize the encryption */
ret = gnutls_cipher_init(&handle, algo, &key, &iv);
if (ret < 0) {
g_free(key.data);
g_free(iv.data);
return NULL;
}
/* Find out how big buffer (in multiples of BUFSIZE)
* we need to store the password. */
i = 1;
len = strlen(password);
while(len >= i * BUFSIZE)
i++;
len = i * BUFSIZE;
/* Fill buf with one block of random data, our password, pad the
* rest with zero bytes. */
buf = malloc(len + blocklen);
memset(buf, 0, len + blocklen);
if (!get_random_bytes(buf, blocklen)) {
g_free(buf);
g_free(key.data);
g_free(iv.data);
gnutls_cipher_deinit(handle);
return NULL;
}
memcpy(buf + blocklen, password, strlen(password));
/* Encrypt into encbuf */
encbuf = malloc(len + blocklen);
memset(encbuf, 0, len + blocklen);
ret = gnutls_cipher_encrypt2(handle, buf, len + blocklen,
encbuf, len + blocklen);
if (ret < 0) {
g_free(key.data);
g_free(iv.data);
g_free(buf);
g_free(encbuf);
gnutls_cipher_deinit(handle);
return NULL;
}
/* Cleanup */
gnutls_cipher_deinit(handle);
g_free(key.data);
g_free(iv.data);
g_free(buf);
/* And finally prepare the resulting string:
* "{algorithm,rounds}base64encodedciphertext" */
base = g_base64_encode(encbuf, len + blocklen);
//printf("base is %s\n", base);
g_free(encbuf);
output = g_strdup_printf("{%s,%d}%s",
gnutls_cipher_get_name(algo), rounds, base);
g_free(base);
//printf(output);
return output;
}
int main(int argc, char* argv[]) {
//printf("pass %s %s\n", password_encrypt_gnutls("totfrefrgo", "passkey0"), gnutls_cipher_get_name(GNUTLS_CIPHER_AES_256_CBC));
printf(password_encrypt_gnutls(argv[1], "passkey0"));
//printf(argv[1]);
}