308 lines
8.2 KiB
C
308 lines
8.2 KiB
C
/*
|
|
* Copyright 1997 Niels Provos <provos@physnet.uni-hamburg.de>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by Niels Provos.
|
|
* 4. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
/* This password hashing algorithm was designed by David Mazieres
|
|
* <dm@lcs.mit.edu> and works as follows:
|
|
*
|
|
* 1. state := InitState ()
|
|
* 2. state := ExpandKey (state, salt, password) 3.
|
|
* REPEAT rounds:
|
|
* state := ExpandKey (state, 0, salt)
|
|
* state := ExpandKey(state, 0, password)
|
|
* 4. ctext := "OrpheanBeholderScryDoubt"
|
|
* 5. REPEAT 64:
|
|
* ctext := Encrypt_ECB (state, ctext);
|
|
* 6. RETURN Concatenate (salt, ctext);
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* FreeBSD implementation by Paul Herman <pherman@frenchfries.net>
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <sys/types.h>
|
|
#include <string.h>
|
|
#include <pwd.h>
|
|
#include "blowfish.h"
|
|
#include "crypt.h"
|
|
|
|
/* This implementation is adaptable to current computing power.
|
|
* You can have up to 2^31 rounds which should be enough for some
|
|
* time to come.
|
|
*/
|
|
|
|
#define BCRYPT_VERSION '2'
|
|
#define BCRYPT_MAXSALT 16 /* Precomputation is just so nice */
|
|
#define BCRYPT_BLOCKS 6 /* Ciphertext blocks */
|
|
#define BCRYPT_MINROUNDS 16 /* we have log2(rounds) in salt */
|
|
|
|
static void encode_base64(u_int8_t *, u_int8_t *, u_int16_t);
|
|
static void decode_base64(u_int8_t *, u_int16_t, const u_int8_t *);
|
|
|
|
static char encrypted[_PASSWORD_LEN];
|
|
static char error[] = ":";
|
|
|
|
static const u_int8_t Base64Code[] =
|
|
"./ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
|
|
|
|
static const u_int8_t index_64[128] =
|
|
{
|
|
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
|
|
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
|
|
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
|
|
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
|
|
255, 255, 255, 255, 255, 255, 0, 1, 54, 55,
|
|
56, 57, 58, 59, 60, 61, 62, 63, 255, 255,
|
|
255, 255, 255, 255, 255, 2, 3, 4, 5, 6,
|
|
7, 8, 9, 10, 11, 12, 13, 14, 15, 16,
|
|
17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27,
|
|
255, 255, 255, 255, 255, 255, 28, 29, 30,
|
|
31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
|
|
41, 42, 43, 44, 45, 46, 47, 48, 49, 50,
|
|
51, 52, 53, 255, 255, 255, 255, 255
|
|
};
|
|
#define CHAR64(c) ( (c) > 127 ? 255 : index_64[(c)])
|
|
|
|
static void
|
|
decode_base64(u_int8_t *buffer, u_int16_t len, const u_int8_t *data)
|
|
{
|
|
u_int8_t *bp = buffer;
|
|
const u_int8_t *p = data;
|
|
u_int8_t c1, c2, c3, c4;
|
|
while (bp < buffer + len) {
|
|
c1 = CHAR64(*p);
|
|
c2 = CHAR64(*(p + 1));
|
|
|
|
/* Invalid data */
|
|
if (c1 == 255 || c2 == 255)
|
|
break;
|
|
|
|
*bp++ = (u_int8_t)((c1 << 2) | ((c2 & 0x30) >> 4));
|
|
if (bp >= buffer + len)
|
|
break;
|
|
|
|
c3 = CHAR64(*(p + 2));
|
|
if (c3 == 255)
|
|
break;
|
|
|
|
*bp++ = ((c2 & 0x0f) << 4) | ((c3 & 0x3c) >> 2);
|
|
if (bp >= buffer + len)
|
|
break;
|
|
|
|
c4 = CHAR64(*(p + 3));
|
|
if (c4 == 255)
|
|
break;
|
|
*bp++ = ((c3 & 0x03) << 6) | c4;
|
|
|
|
p += 4;
|
|
}
|
|
}
|
|
|
|
/* We handle $Vers$log2(NumRounds)$salt+passwd$
|
|
i.e. $2$04$iwouldntknowwhattosayetKdJ6iFtacBqJdKe6aW7ou */
|
|
|
|
char *
|
|
crypt_blowfish(const char *key, const char *salt)
|
|
{
|
|
blf_ctx state;
|
|
u_int32_t rounds, i, k;
|
|
u_int16_t j;
|
|
u_int8_t key_len, salt_len, logr, minr;
|
|
u_int8_t ciphertext[4 * BCRYPT_BLOCKS] = "OrpheanBeholderScryDoubt";
|
|
u_int8_t csalt[BCRYPT_MAXSALT];
|
|
u_int32_t cdata[BCRYPT_BLOCKS];
|
|
static const char *magic = "$2a$04$";
|
|
|
|
/* Defaults */
|
|
minr = 'a';
|
|
logr = 4;
|
|
rounds = 1 << logr;
|
|
|
|
/* If it starts with the magic string, then skip that */
|
|
if(!strncmp(salt, magic, strlen(magic))) {
|
|
salt += strlen(magic);
|
|
}
|
|
else if (*salt == '$') {
|
|
|
|
/* Discard "$" identifier */
|
|
salt++;
|
|
|
|
if (*salt > BCRYPT_VERSION) {
|
|
/* How do I handle errors ? Return ':' */
|
|
return error;
|
|
}
|
|
|
|
/* Check for minor versions */
|
|
if (salt[1] != '$') {
|
|
switch (salt[1]) {
|
|
case 'a':
|
|
/* 'ab' should not yield the same as 'abab' */
|
|
minr = (u_int8_t)salt[1];
|
|
salt++;
|
|
break;
|
|
default:
|
|
return error;
|
|
}
|
|
} else
|
|
minr = 0;
|
|
|
|
/* Discard version + "$" identifier */
|
|
salt += 2;
|
|
|
|
if (salt[2] != '$')
|
|
/* Out of sync with passwd entry */
|
|
return error;
|
|
|
|
/* Computer power doesnt increase linear, 2^x should be fine */
|
|
logr = (u_int8_t)atoi(salt);
|
|
rounds = 1 << logr;
|
|
if (rounds < BCRYPT_MINROUNDS)
|
|
return error;
|
|
|
|
/* Discard num rounds + "$" identifier */
|
|
salt += 3;
|
|
}
|
|
|
|
|
|
/* We dont want the base64 salt but the raw data */
|
|
decode_base64(csalt, BCRYPT_MAXSALT, (const u_int8_t *)salt);
|
|
salt_len = BCRYPT_MAXSALT;
|
|
key_len = (u_int8_t)(strlen(key) + (minr >= 'a' ? 1 : 0));
|
|
|
|
/* Setting up S-Boxes and Subkeys */
|
|
Blowfish_initstate(&state);
|
|
Blowfish_expandstate(&state, csalt, salt_len,
|
|
(const u_int8_t *) key, key_len);
|
|
for (k = 0; k < rounds; k++) {
|
|
Blowfish_expand0state(&state, (const u_int8_t *) key, key_len);
|
|
Blowfish_expand0state(&state, csalt, salt_len);
|
|
}
|
|
|
|
/* This can be precomputed later */
|
|
j = 0;
|
|
for (i = 0; i < BCRYPT_BLOCKS; i++)
|
|
cdata[i] = Blowfish_stream2word(ciphertext, 4 * BCRYPT_BLOCKS, &j);
|
|
|
|
/* Now do the encryption */
|
|
for (k = 0; k < 64; k++)
|
|
blf_enc(&state, cdata, BCRYPT_BLOCKS / 2);
|
|
|
|
for (i = 0; i < BCRYPT_BLOCKS; i++) {
|
|
ciphertext[4 * i + 3] = cdata[i] & 0xff;
|
|
cdata[i] = cdata[i] >> 8;
|
|
ciphertext[4 * i + 2] = cdata[i] & 0xff;
|
|
cdata[i] = cdata[i] >> 8;
|
|
ciphertext[4 * i + 1] = cdata[i] & 0xff;
|
|
cdata[i] = cdata[i] >> 8;
|
|
ciphertext[4 * i + 0] = cdata[i] & 0xff;
|
|
}
|
|
|
|
|
|
i = 0;
|
|
encrypted[i++] = '$';
|
|
encrypted[i++] = BCRYPT_VERSION;
|
|
if (minr)
|
|
encrypted[i++] = (int8_t)minr;
|
|
encrypted[i++] = '$';
|
|
|
|
snprintf(encrypted + i, 4, "%2.2u$", logr);
|
|
|
|
encode_base64((u_int8_t *) encrypted + i + 3, csalt, BCRYPT_MAXSALT);
|
|
encode_base64((u_int8_t *) encrypted + strlen(encrypted), ciphertext,
|
|
4 * BCRYPT_BLOCKS - 1);
|
|
return encrypted;
|
|
}
|
|
|
|
static void
|
|
encode_base64(u_int8_t *buffer, u_int8_t *data, u_int16_t len)
|
|
{
|
|
u_int8_t *bp = buffer;
|
|
u_int8_t *p = data;
|
|
u_int8_t c1, c2;
|
|
while (p < data + len) {
|
|
c1 = *p++;
|
|
*bp++ = Base64Code[(c1 >> 2)];
|
|
c1 = (c1 & 0x03) << 4;
|
|
if (p >= data + len) {
|
|
*bp++ = Base64Code[c1];
|
|
break;
|
|
}
|
|
c2 = *p++;
|
|
c1 |= (c2 >> 4) & 0x0f;
|
|
*bp++ = Base64Code[c1];
|
|
c1 = (c2 & 0x0f) << 2;
|
|
if (p >= data + len) {
|
|
*bp++ = Base64Code[c1];
|
|
break;
|
|
}
|
|
c2 = *p++;
|
|
c1 |= (c2 >> 6) & 0x03;
|
|
*bp++ = Base64Code[c1];
|
|
*bp++ = Base64Code[c2 & 0x3f];
|
|
}
|
|
*bp = '\0';
|
|
}
|
|
|
|
#if 0
|
|
void
|
|
main()
|
|
{
|
|
char blubber[73];
|
|
char salt[100];
|
|
char *p;
|
|
salt[0] = '$';
|
|
salt[1] = BCRYPT_VERSION;
|
|
salt[2] = '$';
|
|
|
|
snprintf(salt + 3, 4, "%2.2u$", 5);
|
|
|
|
printf("24 bytes of salt: ");
|
|
fgets(salt + 6, 94, stdin);
|
|
salt[99] = 0;
|
|
printf("72 bytes of password: ");
|
|
fpurge(stdin);
|
|
fgets(blubber, 73, stdin);
|
|
blubber[72] = 0;
|
|
|
|
p = crypt(blubber, salt);
|
|
printf("Passwd entry: %s\n\n", p);
|
|
|
|
p = bcrypt_gensalt(5);
|
|
printf("Generated salt: %s\n", p);
|
|
p = crypt(blubber, p);
|
|
printf("Passwd entry: %s\n", p);
|
|
}
|
|
#endif
|