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/* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* Utility functions for message digest functions.
*/
#include "cryptolib.h"
#include "utility.h"
#include "vboot_api.h"
void DigestInit(DigestContext* ctx, int sig_algorithm) {
ctx->algorithm = hash_type_map[sig_algorithm];
switch(ctx->algorithm) {
#ifndef CHROMEOS_EC
case SHA1_DIGEST_ALGORITHM:
ctx->sha1_ctx = (SHA1_CTX*) VbExMalloc(sizeof(SHA1_CTX));
SHA1_init(ctx->sha1_ctx);
break;
#endif
case SHA256_DIGEST_ALGORITHM:
ctx->sha256_ctx = (SHA256_CTX*) VbExMalloc(sizeof(SHA256_CTX));
SHA256_init(ctx->sha256_ctx);
break;
#ifndef CHROMEOS_EC
case SHA512_DIGEST_ALGORITHM:
ctx->sha512_ctx = (SHA512_CTX*) VbExMalloc(sizeof(SHA512_CTX));
SHA512_init(ctx->sha512_ctx);
break;
#endif
};
}
void DigestUpdate(DigestContext* ctx, const uint8_t* data, uint32_t len) {
switch(ctx->algorithm) {
#ifndef CHROMEOS_EC
case SHA1_DIGEST_ALGORITHM:
SHA1_update(ctx->sha1_ctx, data, len);
break;
#endif
case SHA256_DIGEST_ALGORITHM:
SHA256_update(ctx->sha256_ctx, data, len);
break;
#ifndef CHROMEOS_EC
case SHA512_DIGEST_ALGORITHM:
SHA512_update(ctx->sha512_ctx, data, len);
break;
#endif
};
}
uint8_t* DigestFinal(DigestContext* ctx) {
uint8_t* digest = NULL;
switch(ctx->algorithm) {
#ifndef CHROMEOS_EC
case SHA1_DIGEST_ALGORITHM:
digest = (uint8_t*) VbExMalloc(SHA1_DIGEST_SIZE);
Memcpy(digest, SHA1_final(ctx->sha1_ctx), SHA1_DIGEST_SIZE);
VbExFree(ctx->sha1_ctx);
break;
#endif
case SHA256_DIGEST_ALGORITHM:
digest = (uint8_t*) VbExMalloc(SHA256_DIGEST_SIZE);
Memcpy(digest, SHA256_final(ctx->sha256_ctx), SHA256_DIGEST_SIZE);
VbExFree(ctx->sha256_ctx);
break;
#ifndef CHROMEOS_EC
case SHA512_DIGEST_ALGORITHM:
digest = (uint8_t*) VbExMalloc(SHA512_DIGEST_SIZE);
Memcpy(digest, SHA512_final(ctx->sha512_ctx), SHA512_DIGEST_SIZE);
VbExFree(ctx->sha512_ctx);
break;
#endif
};
return digest;
}
uint8_t* DigestBuf(const uint8_t* buf, uint64_t len, int sig_algorithm) {
/* Allocate enough space for the largest digest */
uint8_t* digest = (uint8_t*) VbExMalloc(SHA512_DIGEST_SIZE);
/* Define an array mapping [sig_algorithm] to function pointers to the
* SHA{1|256|512} functions.
*/
typedef uint8_t* (*Hash_ptr) (const uint8_t*, uint64_t, uint8_t*);
Hash_ptr hash[] = {
#ifdef CHROMEOS_EC
0, /* RSA 1024 */
0,
0,
0, /* RSA 2048 */
0,
0,
0, /* RSA 4096 */
SHA256,
0,
0, /* RSA 8192 */
0,
0,
#else
SHA1, /* RSA 1024 */
SHA256,
SHA512,
SHA1, /* RSA 2048 */
SHA256,
SHA512,
SHA1, /* RSA 4096 */
SHA256,
SHA512,
SHA1, /* RSA 8192 */
SHA256,
SHA512,
#endif
};
/* Call the appropriate hash function. */
return hash[sig_algorithm](buf, len, digest);
}
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