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comparison hmac_memory.c @ 3:7faae8f46238 libtomcrypt-orig

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Branch renaming
author Matt Johnston <matt@ucc.asn.au>
date Mon, 31 May 2004 18:25:41 +0000
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children 5d99163f7e32
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-1:000000000000 3:7faae8f46238
1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
2 *
3 * LibTomCrypt is a library that provides various cryptographic
4 * algorithms in a highly modular and flexible manner.
5 *
6 * The library is free for all purposes without any express
7 * guarantee it works.
8 *
9 * Tom St Denis, [email protected], http://libtomcrypt.org
10 */
11 /* Submited by Dobes Vandermeer ([email protected]) */
12
13 #include "mycrypt.h"
14
15 /*
16 (1) append zeros to the end of K to create a B byte string
17 (e.g., if K is of length 20 bytes and B=64, then K will be
18 appended with 44 zero bytes 0x00)
19 (2) XOR (bitwise exclusive-OR) the B byte string computed in step
20 (1) with ipad (ipad = the byte 0x36 repeated B times)
21 (3) append the stream of data 'text' to the B byte string resulting
22 from step (2)
23 (4) apply H to the stream generated in step (3)
24 (5) XOR (bitwise exclusive-OR) the B byte string computed in
25 step (1) with opad (opad = the byte 0x5C repeated B times.)
26 (6) append the H result from step (4) to the B byte string
27 resulting from step (5)
28 (7) apply H to the stream generated in step (6) and output
29 the result
30 */
31
32 #ifdef HMAC
33
34 #define HMAC_BLOCKSIZE hash_descriptor[hash].blocksize
35
36 int hmac_memory(int hash, const unsigned char *key, unsigned long keylen,
37 const unsigned char *data, unsigned long len,
38 unsigned char *dst, unsigned long *dstlen)
39 {
40 hmac_state hmac;
41 int err;
42
43 _ARGCHK(key != NULL);
44 _ARGCHK(data != NULL);
45 _ARGCHK(dst != NULL);
46 _ARGCHK(dstlen != NULL);
47
48 if((err = hash_is_valid(hash)) != CRYPT_OK) {
49 return err;
50 }
51
52 if ((err = hmac_init(&hmac, hash, key, keylen)) != CRYPT_OK) {
53 return err;
54 }
55
56 if ((err = hmac_process(&hmac, data, len)) != CRYPT_OK) {
57 return err;
58 }
59
60 if ((err = hmac_done(&hmac, dst, dstlen)) != CRYPT_OK) {
61 return err;
62 }
63 return CRYPT_OK;
64 }
65
66 #endif
67