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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.
*/
/* SHA-1, 256 and 512 functions. */
#ifndef VBOOT_REFERENCE_SHA_H_
#define VBOOT_REFERENCE_SHA_H_
#ifndef VBOOT_REFERENCE_CRYPTOLIB_H_
#error "Do not include this file directly. Use cryptolib.h instead."
#endif
#include "sysincludes.h"
#define SHA1_DIGEST_SIZE 20
#define SHA1_BLOCK_SIZE 64
#define SHA256_DIGEST_SIZE 32
#define SHA256_BLOCK_SIZE 64
#define SHA512_DIGEST_SIZE 64
#define SHA512_BLOCK_SIZE 128
typedef struct SHA1_CTX {
uint64_t count;
uint32_t state[5];
#if defined(HAVE_ENDIAN_H) && defined(HAVE_LITTLE_ENDIAN)
union {
uint8_t b[64];
uint32_t w[16];
} buf;
#else
uint8_t buf[64];
#endif
} SHA1_CTX;
typedef struct {
uint32_t h[8];
uint32_t tot_len;
uint32_t len;
uint8_t block[2 * SHA256_BLOCK_SIZE];
uint8_t buf[SHA256_DIGEST_SIZE]; /* Used for storing the final digest. */
} VB_SHA256_CTX;
typedef struct {
uint64_t h[8];
uint32_t tot_len;
uint32_t len;
uint8_t block[2 * SHA512_BLOCK_SIZE];
uint8_t buf[SHA512_DIGEST_SIZE]; /* Used for storing the final digest. */
} VB_SHA512_CTX;
void SHA1_init(SHA1_CTX* ctx);
void SHA1_update(SHA1_CTX* ctx, const uint8_t* data, uint64_t len);
uint8_t* SHA1_final(SHA1_CTX* ctx);
void SHA256_init(VB_SHA256_CTX* ctx);
void SHA256_update(VB_SHA256_CTX* ctx, const uint8_t* data, uint32_t len);
uint8_t* SHA256_final(VB_SHA256_CTX* ctx);
void SHA512_init(VB_SHA512_CTX* ctx);
void SHA512_update(VB_SHA512_CTX* ctx, const uint8_t* data, uint32_t len);
uint8_t* SHA512_final(VB_SHA512_CTX* ctx);
/* Convenience function for SHA-1. Computes hash on [data] of length [len].
* and stores it into [digest]. [digest] should be pre-allocated to
* SHA1_DIGEST_SIZE bytes.
*/
uint8_t* internal_SHA1(const uint8_t* data, uint64_t len, uint8_t* digest);
/* Convenience function for SHA-256. Computes hash on [data] of length [len].
* and stores it into [digest]. [digest] should be pre-allocated to
* SHA256_DIGEST_SIZE bytes.
*/
uint8_t* internal_SHA256(const uint8_t* data, uint64_t len, uint8_t* digest);
/* Convenience function for SHA-512. Computes hash on [data] of length [len].
* and stores it into [digest]. [digest] should be pre-allocated to
* SHA512_DIGEST_SIZE bytes.
*/
uint8_t* internal_SHA512(const uint8_t* data, uint64_t len, uint8_t* digest);
/*---- Utility functions/wrappers for message digests. */
#define SHA1_DIGEST_ALGORITHM 0
#define SHA256_DIGEST_ALGORITHM 1
#define SHA512_DIGEST_ALGORITHM 2
/* A generic digest context structure which can be used to represent
* the SHA*_CTX for multiple digest algorithms.
*/
typedef struct DigestContext {
SHA1_CTX* sha1_ctx;
VB_SHA256_CTX* sha256_ctx;
VB_SHA512_CTX* sha512_ctx;
int algorithm; /* Hashing algorithm to use. */
} DigestContext;
/* Wrappers for message digest algorithms. These are useful when the hashing
* operation is being done in parallel with something else. DigestContext tracks
* and stores the state of any digest algorithm (one at any given time).
*/
/* Initialize a digest context for use with signature algorithm [algorithm]. */
void DigestInit(DigestContext* ctx, int sig_algorithm);
void DigestUpdate(DigestContext* ctx, const uint8_t* data, uint32_t len);
/* Caller owns the returned digest and must free it. */
uint8_t* DigestFinal(DigestContext* ctx);
/* Returns the appropriate digest for the data in [input_file]
* based on the signature [algorithm].
* Caller owns the returned digest and must free it.
*/
uint8_t* DigestFile(char* input_file, int sig_algorithm);
/* Returns the appropriate digest of [buf] of length
* [len] based on the signature [algorithm].
* Caller owns the returned digest and must free it.
*/
uint8_t* DigestBuf(const uint8_t* buf, uint64_t len, int sig_algorithm);
#endif /* VBOOT_REFERENCE_SHA_H_ */
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