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/*
* Copyright (c) 2015-2022, Arm Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <stdio.h>
#include "debug.h"
#include "key.h"
#if USING_OPENSSL3
#include <openssl/evp.h>
#include <openssl/obj_mac.h>
#else
#include <openssl/sha.h>
#endif
#define BUFFER_SIZE 256
#if USING_OPENSSL3
static int get_algorithm_nid(int hash_alg)
{
int nids[] = {NID_sha256, NID_sha384, NID_sha512};
if (hash_alg < 0 || hash_alg >= sizeof(nids) / sizeof(*nids)) {
return NID_undef;
}
return nids[hash_alg];
}
#endif
int sha_file(int md_alg, const char *filename, unsigned char *md)
{
FILE *inFile;
int bytes;
unsigned char data[BUFFER_SIZE];
#if USING_OPENSSL3
EVP_MD_CTX *mdctx;
const EVP_MD *md_type;
int alg_nid;
unsigned int total_bytes;
#else
SHA256_CTX shaContext;
SHA512_CTX sha512Context;
#endif
if ((filename == NULL) || (md == NULL)) {
ERROR("%s(): NULL argument\n", __func__);
return 0;
}
inFile = fopen(filename, "rb");
if (inFile == NULL) {
ERROR("Cannot read %s\n", filename);
return 0;
}
#if USING_OPENSSL3
mdctx = EVP_MD_CTX_new();
if (mdctx == NULL) {
fclose(inFile);
ERROR("%s(): Could not create EVP MD context\n", __func__);
return 0;
}
alg_nid = get_algorithm_nid(md_alg);
if (alg_nid == NID_undef) {
ERROR("%s(): Invalid hash algorithm\n", __func__);
goto err;
}
md_type = EVP_get_digestbynid(alg_nid);
if (EVP_DigestInit_ex(mdctx, md_type, NULL) == 0) {
ERROR("%s(): Could not initialize EVP MD digest\n", __func__);
goto err;
}
while ((bytes = fread(data, 1, BUFFER_SIZE, inFile)) != 0) {
EVP_DigestUpdate(mdctx, data, bytes);
}
EVP_DigestFinal_ex(mdctx, md, &total_bytes);
fclose(inFile);
EVP_MD_CTX_free(mdctx);
return 1;
err:
fclose(inFile);
EVP_MD_CTX_free(mdctx);
return 0;
#else
if (md_alg == HASH_ALG_SHA384) {
SHA384_Init(&sha512Context);
while ((bytes = fread(data, 1, BUFFER_SIZE, inFile)) != 0) {
SHA384_Update(&sha512Context, data, bytes);
}
SHA384_Final(md, &sha512Context);
} else if (md_alg == HASH_ALG_SHA512) {
SHA512_Init(&sha512Context);
while ((bytes = fread(data, 1, BUFFER_SIZE, inFile)) != 0) {
SHA512_Update(&sha512Context, data, bytes);
}
SHA512_Final(md, &sha512Context);
} else {
SHA256_Init(&shaContext);
while ((bytes = fread(data, 1, BUFFER_SIZE, inFile)) != 0) {
SHA256_Update(&shaContext, data, bytes);
}
SHA256_Final(md, &shaContext);
}
fclose(inFile);
return 1;
#endif
}
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