Commit | Line | Data |
---|---|---|
05128928 NC |
1 | /* |
2 | * hmac.c: routines to compute HMAC-SHA-1/224/256/384/512 digests | |
3 | * | |
4 | * Ref: FIPS PUB 198 The Keyed-Hash Message Authentication Code | |
5 | * | |
6 | * Copyright (C) 2003-2005 Mark Shelor, All Rights Reserved | |
7 | * | |
8 | * Version: 5.32 | |
9 | * Fri Dec 2 02:32:20 MST 2005 | |
10 | * | |
11 | */ | |
12 | ||
13 | #include <stdio.h> | |
14 | #include <stdlib.h> | |
15 | #include <string.h> | |
16 | #include "hmac.h" | |
17 | #include "sha.h" | |
18 | ||
19 | /* hmacopen: creates a new HMAC-SHA digest object */ | |
20 | HMAC *hmacopen(alg, key, keylen) | |
21 | int alg; | |
22 | unsigned char *key; | |
23 | unsigned int keylen; | |
24 | { | |
25 | unsigned int i; | |
26 | HMAC *h; | |
27 | ||
28 | SHA_newz(0, h, 1, HMAC); | |
29 | if (h == NULL) | |
30 | return(NULL); | |
31 | if ((h->isha = shaopen(alg)) == NULL) { | |
32 | SHA_free(h); | |
33 | return(NULL); | |
34 | } | |
35 | if ((h->osha = shaopen(alg)) == NULL) { | |
36 | shaclose(h->isha); | |
37 | SHA_free(h); | |
38 | return(NULL); | |
39 | } | |
40 | if (keylen <= h->osha->blocksize / 8) | |
41 | memcpy(h->key, key, keylen); | |
42 | else { | |
43 | if ((h->ksha = shaopen(alg)) == NULL) { | |
44 | shaclose(h->isha); | |
45 | shaclose(h->osha); | |
46 | SHA_free(h); | |
47 | return(NULL); | |
48 | } | |
49 | shawrite(key, keylen * 8, h->ksha); | |
50 | shafinish(h->ksha); | |
51 | memcpy(h->key, shadigest(h->ksha), h->ksha->digestlen); | |
52 | shaclose(h->ksha); | |
53 | } | |
54 | for (i = 0; i < h->osha->blocksize / 8; i++) | |
55 | h->key[i] ^= 0x5c; | |
56 | shawrite(h->key, h->osha->blocksize, h->osha); | |
57 | for (i = 0; i < h->isha->blocksize / 8; i++) | |
58 | h->key[i] ^= (0x5c ^ 0x36); | |
59 | shawrite(h->key, h->isha->blocksize, h->isha); | |
60 | memset(h->key, 0, sizeof(h->key)); | |
61 | return(h); | |
62 | } | |
63 | ||
64 | /* hmacwrite: triggers a state update using data in bitstr/bitcnt */ | |
65 | unsigned long hmacwrite(bitstr, bitcnt, h) | |
66 | unsigned char *bitstr; | |
67 | unsigned long bitcnt; | |
68 | HMAC *h; | |
69 | { | |
70 | return(shawrite(bitstr, bitcnt, h->isha)); | |
71 | } | |
72 | ||
73 | /* hmacfinish: computes final digest state */ | |
74 | void hmacfinish(h) | |
75 | HMAC *h; | |
76 | { | |
77 | shafinish(h->isha); | |
78 | shawrite(shadigest(h->isha), h->isha->digestlen * 8, h->osha); | |
79 | shaclose(h->isha); | |
80 | shafinish(h->osha); | |
81 | } | |
82 | ||
83 | /* hmacdigest: returns pointer to digest (binary) */ | |
84 | unsigned char *hmacdigest(h) | |
85 | HMAC *h; | |
86 | { | |
87 | return(shadigest(h->osha)); | |
88 | } | |
89 | ||
90 | /* hmachex: returns pointer to digest (hexadecimal) */ | |
91 | char *hmachex(h) | |
92 | HMAC *h; | |
93 | { | |
94 | return(shahex(h->osha)); | |
95 | } | |
96 | ||
97 | /* hmacbase64: returns pointer to digest (Base 64) */ | |
98 | char *hmacbase64(h) | |
99 | HMAC *h; | |
100 | { | |
101 | return(shabase64(h->osha)); | |
102 | } | |
103 | ||
104 | /* hmacclose: de-allocates digest object */ | |
105 | int hmacclose(h) | |
106 | HMAC *h; | |
107 | { | |
108 | shaclose(h->osha); | |
109 | if (h != NULL) { | |
110 | memset(h, 0, sizeof(HMAC)); | |
111 | SHA_free(h); | |
112 | } | |
113 | return(0); | |
114 | } |