Commit | Line | Data |
05128928 |
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 | } |