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 | * | |
7720cfb2 | 6 | * Copyright (C) 2003-2013 Mark Shelor, All Rights Reserved |
05128928 | 7 | * |
7720cfb2 CBW |
8 | * Version: 5.82 |
9 | * Thu Jan 24 04:54:12 MST 2013 | |
05128928 NC |
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 */ | |
14bcf1fb | 20 | HMAC *hmacopen(int alg, unsigned char *key, unsigned int keylen) |
05128928 NC |
21 | { |
22 | unsigned int i; | |
23 | HMAC *h; | |
24 | ||
25 | SHA_newz(0, h, 1, HMAC); | |
26 | if (h == NULL) | |
27 | return(NULL); | |
28 | if ((h->isha = shaopen(alg)) == NULL) { | |
29 | SHA_free(h); | |
30 | return(NULL); | |
31 | } | |
32 | if ((h->osha = shaopen(alg)) == NULL) { | |
33 | shaclose(h->isha); | |
34 | SHA_free(h); | |
35 | return(NULL); | |
36 | } | |
37 | if (keylen <= h->osha->blocksize / 8) | |
38 | memcpy(h->key, key, keylen); | |
39 | else { | |
40 | if ((h->ksha = shaopen(alg)) == NULL) { | |
41 | shaclose(h->isha); | |
42 | shaclose(h->osha); | |
43 | SHA_free(h); | |
44 | return(NULL); | |
45 | } | |
46 | shawrite(key, keylen * 8, h->ksha); | |
47 | shafinish(h->ksha); | |
48 | memcpy(h->key, shadigest(h->ksha), h->ksha->digestlen); | |
49 | shaclose(h->ksha); | |
50 | } | |
51 | for (i = 0; i < h->osha->blocksize / 8; i++) | |
52 | h->key[i] ^= 0x5c; | |
53 | shawrite(h->key, h->osha->blocksize, h->osha); | |
54 | for (i = 0; i < h->isha->blocksize / 8; i++) | |
55 | h->key[i] ^= (0x5c ^ 0x36); | |
56 | shawrite(h->key, h->isha->blocksize, h->isha); | |
57 | memset(h->key, 0, sizeof(h->key)); | |
58 | return(h); | |
59 | } | |
60 | ||
61 | /* hmacwrite: triggers a state update using data in bitstr/bitcnt */ | |
14bcf1fb | 62 | unsigned long hmacwrite(unsigned char *bitstr, unsigned long bitcnt, HMAC *h) |
05128928 NC |
63 | { |
64 | return(shawrite(bitstr, bitcnt, h->isha)); | |
65 | } | |
66 | ||
67 | /* hmacfinish: computes final digest state */ | |
14bcf1fb | 68 | void hmacfinish(HMAC *h) |
05128928 NC |
69 | { |
70 | shafinish(h->isha); | |
71 | shawrite(shadigest(h->isha), h->isha->digestlen * 8, h->osha); | |
72 | shaclose(h->isha); | |
73 | shafinish(h->osha); | |
74 | } | |
75 | ||
76 | /* hmacdigest: returns pointer to digest (binary) */ | |
14bcf1fb | 77 | unsigned char *hmacdigest(HMAC *h) |
05128928 NC |
78 | { |
79 | return(shadigest(h->osha)); | |
80 | } | |
81 | ||
82 | /* hmachex: returns pointer to digest (hexadecimal) */ | |
14bcf1fb | 83 | char *hmachex(HMAC *h) |
05128928 NC |
84 | { |
85 | return(shahex(h->osha)); | |
86 | } | |
87 | ||
88 | /* hmacbase64: returns pointer to digest (Base 64) */ | |
14bcf1fb | 89 | char *hmacbase64(HMAC *h) |
05128928 NC |
90 | { |
91 | return(shabase64(h->osha)); | |
92 | } | |
93 | ||
94 | /* hmacclose: de-allocates digest object */ | |
14bcf1fb | 95 | int hmacclose(HMAC *h) |
05128928 | 96 | { |
747da336 | 97 | if (h != NULL) { |
0bc2b4f8 | 98 | shaclose(h->osha); |
747da336 RGS |
99 | memset(h, 0, sizeof(HMAC)); |
100 | SHA_free(h); | |
101 | } | |
05128928 NC |
102 | return(0); |
103 | } |