96 lines
2.6 KiB
C
96 lines
2.6 KiB
C
/*
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*
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* Wireless daemon for Linux
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*
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* Copyright (C) 2013-2014 Intel Corporation. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <string.h>
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#include <ell/ell.h>
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#include "src/sha256.h"
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#define SHA256_MAC_LEN 32
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static void __hmac_sha256(struct l_checksum *checksum,
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const void *key, size_t key_len,
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const void *data, size_t data_len,
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void *output, size_t size)
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{
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unsigned char ipad[64];
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unsigned char opad[64];
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unsigned char digest[SHA256_MAC_LEN];
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int i;
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/* if key is longer than 64 bytes reset it to key=SHA256(key) */
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if (key_len > 64) {
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l_checksum_update(checksum, key, key_len);
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l_checksum_get_digest(checksum, digest, SHA256_MAC_LEN);
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l_checksum_reset(checksum);
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key = digest;
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key_len = SHA256_MAC_LEN;
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}
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/* start out by storing key in pads */
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memset(ipad, 0, sizeof(ipad));
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memset(opad, 0, sizeof(opad));
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memcpy(ipad, key, key_len);
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memcpy(opad, key, key_len);
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/* XOR key with ipad and opad values */
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for (i = 0; i < 64; i++) {
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ipad[i] ^= 0x36;
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opad[i] ^= 0x5c;
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}
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/* perform inner SHA256 */
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l_checksum_update(checksum, ipad, sizeof(ipad));
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l_checksum_update(checksum, data, data_len);
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l_checksum_get_digest(checksum, digest, SHA256_MAC_LEN);
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l_checksum_reset(checksum);
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/* perform outer SHA256 */
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l_checksum_update(checksum, opad, sizeof(opad));
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l_checksum_update(checksum, digest, SHA256_MAC_LEN);
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l_checksum_get_digest(checksum, output,
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size > SHA256_MAC_LEN ? SHA256_MAC_LEN : size);
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l_checksum_reset(checksum);
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}
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bool hmac_sha256(const void *key, size_t key_len,
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const void *data, size_t data_len, void *output, size_t size)
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{
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struct l_checksum *checksum;
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checksum = l_checksum_new(L_CHECKSUM_SHA256);
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__hmac_sha256(checksum, key, key_len, data, data_len, output, size);
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l_checksum_free(checksum);
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return true;
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}
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