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