1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
2 *
3 * LibTomCrypt is a library that provides various cryptographic
4 * algorithms in a highly modular and flexible manner.
5 *
6 * The library is free for all purposes without any express
7 * guarantee it works.
8 *
9 * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.com
10 */
11 #include <tomcrypt.h>
12
13 /**
14 @file pkcs_5_1.c
15 PKCS #5, Algorithm #1, Tom St Denis
16 */
17 #ifdef PKCS_5
18 /**
19 Execute PKCS #5 v1
20 @param password The password (or key)
21 @param password_len The length of the password (octet)
22 @param salt The salt (or nonce) which is 8 octets long
23 @param iteration_count The PKCS #5 v1 iteration count
24 @param hash_idx The index of the hash desired
25 @param out [out] The destination for this algorithm
26 @param outlen [in/out] The max size and resulting size of the algorithm output
27 @return CRYPT_OK if successful
28 */
pkcs_5_alg1(const unsigned char * password,unsigned long password_len,const unsigned char * salt,int iteration_count,int hash_idx,unsigned char * out,unsigned long * outlen)29 int pkcs_5_alg1(const unsigned char *password, unsigned long password_len,
30 const unsigned char *salt,
31 int iteration_count, int hash_idx,
32 unsigned char *out, unsigned long *outlen)
33 {
34 int err;
35 unsigned long x;
36 hash_state *md;
37 unsigned char *buf;
38
39 LTC_ARGCHK(password != NULL);
40 LTC_ARGCHK(salt != NULL);
41 LTC_ARGCHK(out != NULL);
42 LTC_ARGCHK(outlen != NULL);
43
44 /* test hash IDX */
45 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
46 return err;
47 }
48
49 /* allocate memory */
50 md = XMALLOC(sizeof(hash_state));
51 buf = XMALLOC(MAXBLOCKSIZE);
52 if (md == NULL || buf == NULL) {
53 if (md != NULL) {
54 XFREE(md);
55 }
56 if (buf != NULL) {
57 XFREE(buf);
58 }
59 return CRYPT_MEM;
60 }
61
62 /* hash initial password + salt */
63 if ((err = hash_descriptor[hash_idx].init(md)) != CRYPT_OK) {
64 goto LBL_ERR;
65 }
66 if ((err = hash_descriptor[hash_idx].process(md, password, password_len)) != CRYPT_OK) {
67 goto LBL_ERR;
68 }
69 if ((err = hash_descriptor[hash_idx].process(md, salt, 8)) != CRYPT_OK) {
70 goto LBL_ERR;
71 }
72 if ((err = hash_descriptor[hash_idx].done(md, buf)) != CRYPT_OK) {
73 goto LBL_ERR;
74 }
75
76 while (--iteration_count) {
77 /* code goes here. */
78 x = MAXBLOCKSIZE;
79 if ((err = hash_memory(hash_idx, buf, hash_descriptor[hash_idx].hashsize, buf, &x)) != CRYPT_OK) {
80 goto LBL_ERR;
81 }
82 }
83
84 /* copy upto outlen bytes */
85 for (x = 0; x < hash_descriptor[hash_idx].hashsize && x < *outlen; x++) {
86 out[x] = buf[x];
87 }
88 *outlen = x;
89 err = CRYPT_OK;
90 LBL_ERR:
91 #ifdef LTC_CLEAN_STACK
92 zeromem(buf, MAXBLOCKSIZE);
93 zeromem(md, sizeof(hash_state));
94 #endif
95
96 XFREE(buf);
97 XFREE(md);
98
99 return err;
100 }
101
102 #endif
103
104 /* $Source: /cvs/libtom/libtomcrypt/src/misc/pkcs5/pkcs_5_1.c,v $ */
105 /* $Revision: 1.5 $ */
106 /* $Date: 2006/03/31 14:15:35 $ */
107