mirror of https://github.com/openssl/openssl.git
135 lines
4.1 KiB
C
135 lines
4.1 KiB
C
/*-
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* Copyright 2019-2021 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 EVP_MD_stdin:
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* echo "1ca984dcc913344370cf" | xxd -r -p | ./EVP_MD_stdin
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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/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 created to read from stdin
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*/
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int demonstrate_digest(BIO *input)
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{
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OSSL_LIB_CTX *library_context = NULL;
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int result = 0;
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const char * option_properties = NULL;
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EVP_MD *message_digest = NULL;
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EVP_MD_CTX *digest_context = NULL;
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unsigned int digest_length;
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unsigned char *digest_value = NULL;
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unsigned char buffer[512];
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int ii;
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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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message_digest = EVP_MD_fetch(library_context,
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"SHA3-512", option_properties);
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if (message_digest == NULL) {
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fprintf(stderr, "EVP_MD_fetch could not find SHA3-512.");
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ERR_print_errors_fp(stderr);
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OSSL_LIB_CTX_free(library_context);
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return 0;
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}
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/* Determine the length of the fetched digest type */
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digest_length = EVP_MD_get_size(message_digest);
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if (digest_length <= 0) {
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fprintf(stderr, "EVP_MD_get_size returned invalid size.\n");
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goto cleanup;
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}
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digest_value = OPENSSL_malloc(digest_length);
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if (digest_value == NULL) {
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fprintf(stderr, "No memory.\n");
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goto cleanup;
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}
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/*
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* Make a message digest context to hold temporary state
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* during digest creation
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*/
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digest_context = EVP_MD_CTX_new();
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if (digest_context == NULL) {
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fprintf(stderr, "EVP_MD_CTX_new failed.\n");
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ERR_print_errors_fp(stderr);
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goto cleanup;
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}
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/*
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* Initialize the message digest context to use the fetched
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* digest provider
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*/
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if (EVP_DigestInit(digest_context, message_digest) != 1) {
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fprintf(stderr, "EVP_DigestInit failed.\n");
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ERR_print_errors_fp(stderr);
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goto cleanup;
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}
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while ((ii = BIO_read(input, buffer, sizeof(buffer))) > 0) {
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if (EVP_DigestUpdate(digest_context, buffer, ii) != 1) {
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fprintf(stderr, "EVP_DigestUpdate() failed.\n");
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goto cleanup;
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}
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}
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if (EVP_DigestFinal(digest_context, digest_value, &digest_length) != 1) {
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fprintf(stderr, "EVP_DigestFinal() failed.\n");
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goto cleanup;
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}
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result = 1;
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for (ii=0; ii<digest_length; ii++) {
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fprintf(stdout, "%02x", digest_value[ii]);
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}
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fprintf(stdout, "\n");
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cleanup:
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if (result != 1)
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ERR_print_errors_fp(stderr);
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/* OpenSSL free functions will ignore NULL arguments */
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EVP_MD_CTX_free(digest_context);
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OPENSSL_free(digest_value);
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EVP_MD_free(message_digest);
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OSSL_LIB_CTX_free(library_context);
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return result;
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}
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int main(void)
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{
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int result = 1;
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BIO *input = BIO_new_fd( fileno(stdin), 1 );
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if (input != NULL) {
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result = demonstrate_digest(input);
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BIO_free(input);
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}
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return result;
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}
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