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| 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 | * | |
| dfe1edcb | 6 | * Copyright (C) 2003-2010 Mark Shelor, All Rights Reserved |
| 05128928 | 7 | * |
| 9cc8ef8a CBW |
8 | * Version: 5.50 |
| 9 | * Tue Dec 14 06:20:08 MST 2010 | |
| 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 | } |