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122 lines
3.8 KiB
C
122 lines
3.8 KiB
C
/*-
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* Copyright 2019-2023 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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/*-
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* Example of using EVP_MD_fetch and EVP_Digest* methods to calculate
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* a digest of static buffers
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* You can find SHA3 test vectors from NIST here:
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* https://csrc.nist.gov/CSRC/media/Projects/Cryptographic-Algorithm-Validation-Program/documents/sha3/sha-3bytetestvectors.zip
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* For example, contains these lines:
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Len = 80
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Msg = 1ca984dcc913344370cf
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MD = 6915ea0eeffb99b9b246a0e34daf3947852684c3d618260119a22835659e4f23d4eb66a15d0affb8e93771578f5e8f25b7a5f2a55f511fb8b96325ba2cd14816
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* use xxd convert the hex message string to binary input for BIO_f_md:
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* echo "1ca984dcc913344370cf" | xxd -r -p | ./BIO_f_md
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* and then verify the output matches MD above.
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*/
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#include <string.h>
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#include <stdio.h>
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#include <openssl/err.h>
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#include <openssl/bio.h>
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#include <openssl/evp.h>
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/*-
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* This demonstration will show how to digest data using
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* a BIO configured with a message digest
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* A message digest name may be passed as an argument.
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* The default digest is SHA3-512
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*/
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int main(int argc, char * argv[])
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{
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int ret = EXIT_FAILURE;
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OSSL_LIB_CTX *library_context = NULL;
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BIO *input = NULL;
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BIO *bio_digest = NULL, *reading = NULL;
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EVP_MD *md = NULL;
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unsigned char buffer[512];
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size_t digest_size;
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char *digest_value = NULL;
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int j;
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input = BIO_new_fd(fileno(stdin), 1);
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if (input == NULL) {
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fprintf(stderr, "BIO_new_fd() for stdin returned NULL\n");
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goto cleanup;
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}
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library_context = OSSL_LIB_CTX_new();
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if (library_context == NULL) {
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fprintf(stderr, "OSSL_LIB_CTX_new() returned NULL\n");
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goto cleanup;
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}
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/*
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* Fetch a message digest by name
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* The algorithm name is case insensitive.
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* See providers(7) for details about algorithm fetching
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*/
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md = EVP_MD_fetch(library_context, "SHA3-512", NULL);
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if (md == NULL) {
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fprintf(stderr, "EVP_MD_fetch did not find SHA3-512.\n");
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goto cleanup;
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}
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digest_size = EVP_MD_get_size(md);
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digest_value = OPENSSL_malloc(digest_size);
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if (digest_value == NULL) {
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fprintf(stderr, "Can't allocate %lu bytes for the digest value.\n", (unsigned long)digest_size);
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goto cleanup;
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}
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/* Make a bio that uses the digest */
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bio_digest = BIO_new(BIO_f_md());
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if (bio_digest == NULL) {
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fprintf(stderr, "BIO_new(BIO_f_md()) returned NULL\n");
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goto cleanup;
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}
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/* set our bio_digest BIO to digest data */
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if (BIO_set_md(bio_digest, md) != 1) {
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fprintf(stderr, "BIO_set_md failed.\n");
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goto cleanup;
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}
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/*-
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* We will use BIO chaining so that as we read, the digest gets updated
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* See the man page for BIO_push
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*/
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reading = BIO_push(bio_digest, input);
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while (BIO_read(reading, buffer, sizeof(buffer)) > 0)
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;
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/*-
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* BIO_gets must be used to calculate the final
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* digest value and then copy it to digest_value.
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*/
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if (BIO_gets(bio_digest, digest_value, digest_size) != digest_size) {
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fprintf(stderr, "BIO_gets(bio_digest) failed\n");
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goto cleanup;
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}
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for (j = 0; j < digest_size; j++) {
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fprintf(stdout, "%02x", (unsigned char)digest_value[j]);
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}
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fprintf(stdout, "\n");
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ret = EXIT_SUCCESS;
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cleanup:
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if (ret != EXIT_SUCCESS)
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ERR_print_errors_fp(stderr);
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OPENSSL_free(digest_value);
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BIO_free(input);
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BIO_free(bio_digest);
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EVP_MD_free(md);
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OSSL_LIB_CTX_free(library_context);
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return ret;
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}
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