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1 | #include "hmac.h" | |
2 | #include <string.h> | |
3 | ||
4 | void hmacsha256_init(hmacsha256 *c, unsigned char *key, int keylen) { | |
5 | unsigned char realkey[64], outerkey[64], innerkey[64]; | |
6 | SHA256_CTX keyc; | |
7 | int i; | |
8 | ||
9 | memset(realkey, 0, sizeof(realkey)); | |
10 | if(keylen > 64) { | |
11 | SHA256_Init(&keyc); | |
12 | SHA256_Update(&keyc, key, keylen); | |
13 | SHA256_Final(realkey, &keyc); | |
14 | keylen = 32; | |
15 | } else { | |
16 | memcpy(realkey, key, keylen); | |
17 | } | |
18 | ||
19 | /* abusing the cache here, if we do sha256 in between that'll erase it */ | |
20 | for(i=0;i<64;i++) { | |
21 | int r = realkey[i]; | |
22 | innerkey[i] = r ^ 0x36; | |
23 | outerkey[i] = r ^ 0x5c; | |
24 | } | |
25 | ||
26 | SHA256_Init(&c->outer); | |
27 | SHA256_Init(&c->inner); | |
28 | SHA256_Update(&c->outer, outerkey, 64); | |
29 | SHA256_Update(&c->inner, innerkey, 64); | |
30 | } | |
31 | ||
32 | void hmacsha256_update(hmacsha256 *c, unsigned char *message, int messagelen) { | |
33 | SHA256_Update(&c->inner, message, messagelen); | |
34 | } | |
35 | ||
36 | void hmacsha256_final(hmacsha256 *c, unsigned char *digest) { | |
37 | SHA256_Final(digest, &c->inner); | |
38 | SHA256_Update(&c->outer, digest, 32); | |
39 | SHA256_Final(digest, &c->outer); | |
40 | } | |
41 | ||
42 | void hmacsha1_init(hmacsha1 *c, unsigned char *key, int keylen) { | |
43 | unsigned char realkey[64], outerkey[64], innerkey[64]; | |
44 | SHA1_CTX keyc; | |
45 | int i; | |
46 | ||
47 | memset(realkey, 0, sizeof(realkey)); | |
48 | if(keylen > 64) { | |
49 | SHA1Init(&keyc); | |
50 | SHA1Update(&keyc, key, keylen); | |
51 | SHA1Final(realkey, &keyc); | |
52 | keylen = 20; | |
53 | } else { | |
54 | memcpy(realkey, key, keylen); | |
55 | } | |
56 | ||
57 | /* abusing the cache here, if we do sha1 in between that'll erase it */ | |
58 | for(i=0;i<64;i++) { | |
59 | int r = realkey[i]; | |
60 | innerkey[i] = r ^ 0x36; | |
61 | outerkey[i] = r ^ 0x5c; | |
62 | } | |
63 | ||
64 | SHA1Init(&c->outer); | |
65 | SHA1Init(&c->inner); | |
66 | SHA1Update(&c->outer, outerkey, 64); | |
67 | SHA1Update(&c->inner, innerkey, 64); | |
68 | } | |
69 | ||
70 | void hmacsha1_update(hmacsha1 *c, unsigned char *message, int messagelen) { | |
71 | SHA1Update(&c->inner, message, messagelen); | |
72 | } | |
73 | ||
74 | void hmacsha1_final(hmacsha1 *c, unsigned char *digest) { | |
75 | SHA1Final(digest, &c->inner); | |
76 | SHA1Update(&c->outer, digest, 20); | |
77 | SHA1Final(digest, &c->outer); | |
78 | } | |
79 | ||
80 | void hmacmd5_init(hmacmd5 *c, unsigned char *key, int keylen) { | |
81 | unsigned char realkey[64], outerkey[64], innerkey[64]; | |
82 | MD5Context keyc; | |
83 | int i; | |
84 | ||
85 | memset(realkey, 0, sizeof(realkey)); | |
86 | if(keylen > 64) { | |
87 | MD5Init(&keyc); | |
88 | MD5Update(&keyc, key, keylen); | |
89 | MD5Final(realkey, &keyc); | |
90 | keylen = 16; | |
91 | } else { | |
92 | memcpy(realkey, key, keylen); | |
93 | } | |
94 | ||
95 | /* abusing the cache here, if we do sha1 in between that'll erase it */ | |
96 | for(i=0;i<64;i++) { | |
97 | int r = realkey[i]; | |
98 | innerkey[i] = r ^ 0x36; | |
99 | outerkey[i] = r ^ 0x5c; | |
100 | } | |
101 | ||
102 | MD5Init(&c->outer); | |
103 | MD5Init(&c->inner); | |
104 | MD5Update(&c->outer, outerkey, 64); | |
105 | MD5Update(&c->inner, innerkey, 64); | |
106 | } | |
107 | ||
108 | void hmacmd5_update(hmacmd5 *c, unsigned char *message, int messagelen) { | |
109 | MD5Update(&c->inner, message, messagelen); | |
110 | } | |
111 | ||
112 | void hmacmd5_final(hmacmd5 *c, unsigned char *digest) { | |
113 | MD5Final(digest, &c->inner); | |
114 | MD5Update(&c->outer, digest, 16); | |
115 | MD5Final(digest, &c->outer); | |
116 | } | |
117 | ||
118 | static const char *hexdigits = "0123456789abcdef"; | |
119 | ||
120 | char *hmac_printhex(unsigned char *data, char *out, size_t len) { | |
121 | size_t i; | |
122 | unsigned char *o = (unsigned char *)out; | |
123 | ||
124 | for(i=0;i<len;i++) { | |
125 | *o++ = hexdigits[(*data & 0xf0) >> 4]; | |
126 | *o++ = hexdigits[*data & 0x0f]; | |
127 | data++; | |
128 | } | |
129 | ||
130 | *o = '\0'; | |
131 | return out; | |
132 | } |