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f3f9e00ef0
This patch adds HMAC. HMAC will be used to sign/verify NVM structures. Hash algorithms can be selected from those supported by enum vb2_hash_algorithm (i.e. SHA1, SHA256, or SHA512). BUG=chrome-os-partner:51907 BRANCH=tot TEST=make runtests Change-Id: I6d349bc807874fe2a5512aabcd7fbf67a4eaa40a Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/342880 Reviewed-by: Randall Spangler <rspangler@chromium.org>
61 lines
1.4 KiB
C
61 lines
1.4 KiB
C
/* Copyright 2016 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "2sysincludes.h"
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#include "2sha.h"
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#include "2hmac.h"
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int hmac(enum vb2_hash_algorithm alg,
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const void *key, uint32_t key_size,
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const void *msg, uint32_t msg_size,
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uint8_t *mac, uint32_t mac_size)
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{
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uint32_t block_size;
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uint32_t digest_size;
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uint8_t k[VB2_MAX_BLOCK_SIZE];
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uint8_t o_pad[VB2_MAX_BLOCK_SIZE];
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uint8_t i_pad[VB2_MAX_BLOCK_SIZE];
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uint8_t b[VB2_MAX_DIGEST_SIZE];
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struct vb2_digest_context dc;
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int i;
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if (!key | !msg | !mac)
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return -1;
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digest_size = vb2_digest_size(alg);
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block_size = vb2_hash_block_size(alg);
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if (!digest_size || !block_size)
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return -1;
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if (mac_size < digest_size)
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return -1;
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if (key_size > block_size) {
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vb2_digest_buffer((uint8_t *)key, key_size, alg, k, block_size);
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key_size = digest_size;
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} else {
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memcpy(k, key, key_size);
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}
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if (key_size < block_size)
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memset(k + key_size, 0, block_size - key_size);
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for (i = 0; i < block_size; i++) {
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o_pad[i] = 0x5c ^ k[i];
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i_pad[i] = 0x36 ^ k[i];
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}
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vb2_digest_init(&dc, alg);
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vb2_digest_extend(&dc, i_pad, block_size);
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vb2_digest_extend(&dc, msg, msg_size);
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vb2_digest_finalize(&dc, b, digest_size);
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vb2_digest_init(&dc, alg);
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vb2_digest_extend(&dc, o_pad, block_size);
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vb2_digest_extend(&dc, b, digest_size);
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vb2_digest_finalize(&dc, mac, mac_size);
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return 0;
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}
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