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1 /* Software-Based Trusted Platform Module (TPM) Emulator for Linux | 1 /* Software-based Trusted Platform Module (TPM) Emulator |
2 * Copyright (C) 2004 Mario Strasser <mast@gmx.net>, | 2 * Copyright (C) 2004-2010 Mario Strasser <mast@gmx.net> |
3 * | 3 * |
4 * This module is free software; you can redistribute it and/or modify | 4 * This module is free software; you can redistribute it and/or modify |
5 * it under the terms of the GNU General Public License as published | 5 * it under the terms of the GNU General Public License as published |
6 * by the Free Software Foundation; either version 2 of the License, | 6 * by the Free Software Foundation; either version 2 of the License, |
7 * or (at your option) any later version. | 7 * or (at your option) any later version. |
8 * | 8 * |
9 * This module is distributed in the hope that it will be useful, | 9 * This module is distributed in the hope that it will be useful, |
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of | 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
12 * GNU General Public License for more details. | 12 * GNU General Public License for more details. |
13 * | 13 * |
14 * $Id$ | 14 * $Id: hmac.c 364 2010-02-11 10:24:45Z mast $ |
15 */ | 15 */ |
16 | 16 |
17 #include "hmac.h" | 17 #include "hmac.h" |
18 #include <string.h> | 18 #include <string.h> |
19 | 19 |
20 void tpm_hmac_init(tpm_hmac_ctx_t *ctx, const uint8_t *key, size_t key_len) | 20 void tpm_hmac_init(tpm_hmac_ctx_t *ctx, const uint8_t *key, size_t key_len) |
21 { | 21 { |
22 uint8_t tk[SHA1_DIGEST_LENGTH]; | 22 uint8_t tk[SHA1_DIGEST_LENGTH]; |
23 uint8_t k_ipad[HMAC_PAD_LENGTH]; | 23 uint8_t k_ipad[HMAC_PAD_LENGTH]; |
24 int i; | 24 int i; |
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56 { | 56 { |
57 /* complete inner hash */ | 57 /* complete inner hash */ |
58 tpm_sha1_final(&ctx->ctx, digest); | 58 tpm_sha1_final(&ctx->ctx, digest); |
59 /* perform outer hash */ | 59 /* perform outer hash */ |
60 tpm_sha1_init(&ctx->ctx); | 60 tpm_sha1_init(&ctx->ctx); |
61 tpm_sha1_update(&ctx->ctx, ctx->k_opad, HMAC_PAD_LENGTH); | 61 tpm_sha1_update(&ctx->ctx, ctx->k_opad, HMAC_PAD_LENGTH); |
62 tpm_sha1_update(&ctx->ctx, digest, SHA1_DIGEST_LENGTH); | 62 tpm_sha1_update(&ctx->ctx, digest, SHA1_DIGEST_LENGTH); |
63 tpm_sha1_final(&ctx->ctx, digest); | 63 tpm_sha1_final(&ctx->ctx, digest); |
64 } | 64 } |
65 | 65 |
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