crypto/sha/sha256.c

/* Copyright (c) 2024, Google Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */

#include <openssl/sha.h>

#include <openssl/mem.h>

#include "../fipsmodule/bcm_interface.h"


int SHA224_Init(SHA256_CTX *sha) {
  BCM_sha224_init(sha);
  return 1;
}

int SHA224_Update(SHA256_CTX *sha, const void *data, size_t len) {
  BCM_sha224_update(sha, data, len);
  return 1;
}

int SHA224_Final(uint8_t out[SHA224_DIGEST_LENGTH], SHA256_CTX *sha) {
  BCM_sha224_final(out, sha);
  return 1;
}

uint8_t *SHA224(const uint8_t *data, size_t len,
                uint8_t out[SHA224_DIGEST_LENGTH]) {
  SHA256_CTX ctx;
  BCM_sha224_init(&ctx);
  BCM_sha224_update(&ctx, data, len);
  BCM_sha224_final(out, &ctx);
  OPENSSL_cleanse(&ctx, sizeof(ctx));
  return out;
}

int SHA256_Init(SHA256_CTX *sha) {
  BCM_sha256_init(sha);
  return 1;
}

int SHA256_Update(SHA256_CTX *sha, const void *data, size_t len) {
  BCM_sha256_update(sha, data, len);
  return 1;
}

int SHA256_Final(uint8_t out[SHA256_DIGEST_LENGTH], SHA256_CTX *sha) {
  // TODO(bbe): This overflow check one of the few places a low-level hash
  // 'final' function can fail. SHA-512 does not have a corresponding check.
  // The BCM function is infallible and will abort if this is done incorrectly.
  // we should verify nothing crashes with this removed and eliminate the 0
  // return.
  if (sha->md_len > SHA256_DIGEST_LENGTH) {
    return 0;
  }
  BCM_sha256_final(out, sha);
  return 1;
}

uint8_t *SHA256(const uint8_t *data, size_t len,
                uint8_t out[SHA256_DIGEST_LENGTH]) {
  SHA256_CTX ctx;
  BCM_sha256_init(&ctx);
  BCM_sha256_update(&ctx, data, len);
  BCM_sha256_final(out, &ctx);
  OPENSSL_cleanse(&ctx, sizeof(ctx));
  return out;
}

void SHA256_Transform(SHA256_CTX *sha, const uint8_t block[SHA256_CBLOCK]) {
  BCM_sha256_transform(sha, block);
}

void SHA256_TransformBlocks(uint32_t state[8], const uint8_t *data,
                            size_t num_blocks) {
  BCM_sha256_transform_blocks(state, data, num_blocks);
}