2 Unix SMB/CIFS implementation.
3 Interface header: HMAC SHA-1 code
4 Copyright (C) Stefan Metzmacher
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 taken direct from rfc2202 implementation and modified for suitable use
26 #include "lib/crypto/crypto.h"
28 /***********************************************************************
29 the rfc 2104/2202 version of hmac_sha1 initialisation.
30 ***********************************************************************/
31 _PUBLIC_ void hmac_sha1_init(const uint8_t *key, size_t key_len, struct HMACSHA1Context *ctx)
34 uint8_t tk[SHA1HashSize];
36 /* if key is longer than 64 bytes reset it to key=MD5(key) */
39 struct SHA1Context tctx;
42 SHA1Update(&tctx, key, key_len);
46 key_len = SHA1HashSize;
49 /* start out by storing key in pads */
50 ZERO_STRUCT(ctx->k_ipad);
51 ZERO_STRUCT(ctx->k_opad);
52 memcpy( ctx->k_ipad, key, key_len);
53 memcpy( ctx->k_opad, key, key_len);
55 /* XOR key with ipad and opad values */
58 ctx->k_ipad[i] ^= 0x36;
59 ctx->k_opad[i] ^= 0x5c;
63 SHA1Update(&ctx->ctx, ctx->k_ipad, 64);
66 /***********************************************************************
67 update hmac_sha1 "inner" buffer
68 ***********************************************************************/
69 _PUBLIC_ void hmac_sha1_update(const uint8_t *data, size_t data_len, struct HMACSHA1Context *ctx)
71 SHA1Update(&ctx->ctx, data, data_len); /* then text of datagram */
74 /***********************************************************************
75 finish off hmac_sha1 "inner" buffer and generate outer one.
76 ***********************************************************************/
77 _PUBLIC_ void hmac_sha1_final(uint8_t digest[SHA1HashSize], struct HMACSHA1Context *ctx)
79 struct SHA1Context ctx_o;
81 SHA1Final(digest, &ctx->ctx);
84 SHA1Update(&ctx_o, ctx->k_opad, 64);
85 SHA1Update(&ctx_o, digest, SHA1HashSize);
86 SHA1Final(digest, &ctx_o);