9dd8f88841
Change-Id: Ibfa8b6b60b2b39212cef27bb2a5f8849218164bb Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org> Reviewed-on: http://review.coreboot.org/11133 Tested-by: build bot (Jenkins) Reviewed-by: Patrick Georgi <pgeorgi@google.com>
72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
/*
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* Copyright (C) 2015 Broadcom Corporation
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation version 2.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdint.h>
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#include "secimage.h"
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#include <openssl/hmac.h>
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/*----------------------------------------------------------------------
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* Name : HmacSha256Hash
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* Purpose :
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* Input : none
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* Output : none
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*---------------------------------------------------------------------*/
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int HmacSha256Hash(uint8_t *data, uint32_t len, uint8_t *hash, uint8_t *key)
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{
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HMAC_CTX hctx;
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HMAC_CTX_init(&hctx);
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HMAC_Init_ex(&hctx, key, 32, EVP_sha256(), NULL);
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/* FIXME: why we need this? NULL means to use whatever there is?
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* if removed, result is different
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*/
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HMAC_Init_ex(&hctx, NULL, 0, NULL, NULL);
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HMAC_Update(&hctx, data, len);
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HMAC_Final(&hctx, hash, NULL);
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HMAC_CTX_cleanup(&hctx);
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return 0;
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}
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/*----------------------------------------------------------------------
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* Name : AppendHMACSignature
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* Purpose : Appends HMAC signature at the end of the data
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*---------------------------------------------------------------------*/
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int AppendHMACSignature(uint8_t *data, uint32_t length, char *filename,
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uint32_t offset)
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{
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uint8_t hmackey[32];
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uint32_t len;
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uint32_t status;
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uint8_t *digest = data + length;
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len = ReadBinaryFile(filename, hmackey, 32);
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if (len != 32) {
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printf("Error reading hmac key file\n");
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return 0;
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}
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status = HmacSha256Hash(&data[offset], length - offset, digest,
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hmackey);
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if (status) {
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printf("HMAC-SHA256 hash error\n");
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return 0;
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}
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return 32;
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}
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