libavb/avb_sha.h

/*
 * Copyright (C) 2016 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifdef AVB_INSIDE_LIBAVB_H
#error "You can't include avb_sha.h in the public header libavb.h."
#endif

#ifndef AVB_COMPILATION
#error "Never include this file, it may only be used from internal avb code."
#endif

#ifndef AVB_SHA_H_
#define AVB_SHA_H_

#ifdef __cplusplus
extern "C" {
#endif

#include "avb_sysdeps.h"

/* Size in bytes of a SHA-256 digest. */
#define AVB_SHA256_DIGEST_SIZE 32

/* Block size in bytes of a SHA-256 digest. */
#define AVB_SHA256_BLOCK_SIZE 64

/* Size in bytes of a SHA-512 digest. */
#define AVB_SHA512_DIGEST_SIZE 64

/* Block size in bytes of a SHA-512 digest. */
#define AVB_SHA512_BLOCK_SIZE 128

/* Data structure used for SHA-256. */
typedef struct {
  uint32_t h[8];
  uint32_t tot_len;
  uint32_t len;
  uint8_t block[2 * AVB_SHA256_BLOCK_SIZE];
  uint8_t buf[AVB_SHA256_DIGEST_SIZE]; /* Used for storing the final digest. */
} AvbSHA256Ctx;

/* Data structure used for SHA-512. */
typedef struct {
  uint64_t h[8];
  uint32_t tot_len;
  uint32_t len;
  uint8_t block[2 * AVB_SHA512_BLOCK_SIZE];
  uint8_t buf[AVB_SHA512_DIGEST_SIZE]; /* Used for storing the final digest. */
} AvbSHA512Ctx;

/* Initializes the SHA-256 context. */
void avb_sha256_init(AvbSHA256Ctx* ctx);

/* Updates the SHA-256 context with |len| bytes from |data|. */
void avb_sha256_update(AvbSHA256Ctx* ctx, const uint8_t* data, uint32_t len);

/* Returns the SHA-256 digest. */
uint8_t* avb_sha256_final(AvbSHA256Ctx* ctx) AVB_ATTR_WARN_UNUSED_RESULT;

/* Initializes the SHA-512 context. */
void avb_sha512_init(AvbSHA512Ctx* ctx);

/* Updates the SHA-512 context with |len| bytes from |data|. */
void avb_sha512_update(AvbSHA512Ctx* ctx, const uint8_t* data, uint32_t len);

/* Returns the SHA-512 digest. */
uint8_t* avb_sha512_final(AvbSHA512Ctx* ctx) AVB_ATTR_WARN_UNUSED_RESULT;

#ifdef __cplusplus
}
#endif

#endif /* AVB_SHA_H_ */