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 3 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, see <http://www.gnu.org/licenses/>.
21 taken direct from rfc2202 implementation and modified for suitable use
25 #include "lib/crypto/crypto.h"
27 /***********************************************************************
28 the rfc 2104/2202 version of hmac_sha1 initialisation.
29 ***********************************************************************/
30 _PUBLIC_ void hmac_sha1_init(const uint8_t *key, size_t key_len, struct HMACSHA1Context *ctx)
33 uint8_t tk[SHA1HashSize];
35 /* if key is longer than 64 bytes reset it to key=MD5(key) */
38 struct SHA1Context tctx;
41 SHA1Update(&tctx, key, key_len);
45 key_len = SHA1HashSize;
48 /* start out by storing key in pads */
49 ZERO_STRUCT(ctx->k_ipad);
50 ZERO_STRUCT(ctx->k_opad);
51 memcpy( ctx->k_ipad, key, key_len);
52 memcpy( ctx->k_opad, key, key_len);
54 /* XOR key with ipad and opad values */
57 ctx->k_ipad[i] ^= 0x36;
58 ctx->k_opad[i] ^= 0x5c;
62 SHA1Update(&ctx->ctx, ctx->k_ipad, 64);
65 /***********************************************************************
66 update hmac_sha1 "inner" buffer
67 ***********************************************************************/
68 _PUBLIC_ void hmac_sha1_update(const uint8_t *data, size_t data_len, struct HMACSHA1Context *ctx)
70 SHA1Update(&ctx->ctx, data, data_len); /* then text of datagram */
73 /***********************************************************************
74 finish off hmac_sha1 "inner" buffer and generate outer one.
75 ***********************************************************************/
76 _PUBLIC_ void hmac_sha1_final(uint8_t digest[SHA1HashSize], struct HMACSHA1Context *ctx)
78 struct SHA1Context ctx_o;
80 SHA1Final(digest, &ctx->ctx);
83 SHA1Update(&ctx_o, ctx->k_opad, 64);
84 SHA1Update(&ctx_o, digest, SHA1HashSize);
85 SHA1Final(digest, &ctx_o);