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/*
* hash.c: support functions for tb_hash_t type
*
* Copyright (c) 2006-2010, Intel Corporation
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
* * Neither the name of the Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <config.h>
#include <efibase.h>
#include <types.h>
#include <stdbool.h>
#include <printk.h>
#include <compiler.h>
#include <string.h>
#include <misc.h>
#include <sha1.h>
#include <sha256.h>
#include <hash.h>
/*
* are_hashes_equal
*
* compare whether two hash values are equal.
*
*/
bool are_hashes_equal(const tb_hash_t *hash1, const tb_hash_t *hash2,
uint16_t hash_alg)
{
unsigned int len;
if ( ( hash1 == NULL ) || ( hash2 == NULL ) ) {
printk(TBOOT_ERR"Error: hash pointer is zero.\n");
return false;
}
len = get_hash_size(hash_alg);
if ( len > 0 )
return (memcmp(hash1, hash2, len) == 0);
else {
printk(TBOOT_ERR"unsupported hash alg (%u)\n", hash_alg);
return false;
}
}
/*
* hash_buffer
*
* hash the buffer according to the algorithm
*
*/
bool hash_buffer(const unsigned char* buf, size_t size, tb_hash_t *hash,
uint16_t hash_alg)
{
if ( hash == NULL ) {
printk(TBOOT_ERR"Error: There is no space for output hash.\n");
return false;
}
if ( hash_alg == TB_HALG_SHA1 ) {
sha1_buffer(buf, size, hash->sha1);
return true;
}
else if ( hash_alg == TB_HALG_SHA256 ) {
sha256_buffer(buf, size, hash->sha256);
return true;
}
else if ( hash_alg == TB_HALG_SM3 ) {
printk(TBOOT_ERR"unsupported hash alg (%u)\n", hash_alg);
return false;
}
else {
printk(TBOOT_ERR"unsupported hash alg (%u)\n", hash_alg);
return false;
}
}
/*
* extend_hash
*
* perform "extend" of two hashes (i.e. hash1 = SHA(hash1 || hash2)
*
*/
bool extend_hash(tb_hash_t *hash1, const tb_hash_t *hash2, uint16_t hash_alg)
{
uint8_t buf[2*SHA512_LENGTH];
/* RJP this is nuts - don't do that - it freaks the compiler out:
uint8_t buf[2*get_hash_size(hash_alg)]; */
if ( hash1 == NULL || hash2 == NULL ) {
printk(TBOOT_ERR"Error: There is no space for output hash.\n");
return false;
}
if ( hash_alg == TB_HALG_SHA1 ) {
memcpy(buf, &(hash1->sha1), sizeof(hash1->sha1));
memcpy(buf + sizeof(hash1->sha1), &(hash2->sha1), sizeof(hash1->sha1));
sha1_buffer(buf, 2*sizeof(hash1->sha1), hash1->sha1);
return true;
}
else if ( hash_alg == TB_HALG_SHA256 ) {
memcpy(buf, &(hash1->sha256), sizeof(hash1->sha256));
memcpy(buf + sizeof(hash1->sha256), &(hash2->sha256), sizeof(hash1->sha256));
sha256_buffer(buf, 2*sizeof(hash1->sha256), hash1->sha256);
return true;
}
else if ( hash_alg == TB_HALG_SM3 ) {
printk(TBOOT_ERR"unsupported hash alg (%u)\n", hash_alg);
return false;
}
else {
printk(TBOOT_ERR"unsupported hash alg (%u)\n", hash_alg);
return false;
}
}
void print_hash(const tb_hash_t *hash, uint16_t hash_alg)
{
if ( hash == NULL ) {
printk(TBOOT_WARN"NULL");
return;
}
if ( hash_alg == TB_HALG_SHA1 )
print_hex(NULL, (uint8_t *)hash->sha1, sizeof(hash->sha1));
else if ( hash_alg == TB_HALG_SHA256 )
print_hex(NULL, (uint8_t *)hash->sha256, sizeof(hash->sha256));
else if ( hash_alg == TB_HALG_SM3 )
print_hex(NULL, (uint8_t *)hash->sm3, sizeof(hash->sm3));
else if ( hash_alg == TB_HALG_SHA384 )
print_hex(NULL, (uint8_t *)hash->sha384, sizeof(hash->sha384));
else {
printk(TBOOT_WARN"unsupported hash alg (%u)\n", hash_alg);
return;
}
}
void copy_hash(tb_hash_t *dest_hash, const tb_hash_t *src_hash,
uint16_t hash_alg)
{
unsigned int len;
if ( dest_hash == NULL || src_hash == NULL ) {
printk(TBOOT_WARN"hashes are NULL\n");
return;
}
len = get_hash_size(hash_alg);
if ( len > 0 )
memcpy(dest_hash, src_hash, len);
else
printk(TBOOT_WARN"unsupported hash alg (%u)\n", hash_alg);
}
/*
* Local variables:
* mode: C
* c-set-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
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