mirror of
https://github.com/openssl/openssl.git
synced 2024-12-21 06:09:35 +08:00
09ff84bd27
The demo code is quite often block copied for new demos, so this PR changes demos to use EXIT_SUCCESS & EXIT_FAILURE instead of using 0 and 1. Internal functions use the normal notation of 0 = error, 1 = success, but the value returned by main() must use EXIT_SUCCESS and EXIT_FAILURE. Reviewed-by: Paul Dale <pauli@openssl.org> Reviewed-by: Tomas Mraz <tomas@openssl.org> (Merged from https://github.com/openssl/openssl/pull/20545)
122 lines
3.8 KiB
C
122 lines
3.8 KiB
C
/*-
|
|
* Copyright 2019-2021 The OpenSSL Project Authors. All Rights Reserved.
|
|
*
|
|
* Licensed under the Apache License 2.0 (the "License"). You may not use
|
|
* this file except in compliance with the License. You can obtain a copy
|
|
* in the file LICENSE in the source distribution or at
|
|
* https://www.openssl.org/source/license.html
|
|
*/
|
|
|
|
/*-
|
|
* Example of using EVP_MD_fetch and EVP_Digest* methods to calculate
|
|
* a digest of static buffers
|
|
* You can find SHA3 test vectors from NIST here:
|
|
* https://csrc.nist.gov/CSRC/media/Projects/Cryptographic-Algorithm-Validation-Program/documents/sha3/sha-3bytetestvectors.zip
|
|
* For example, contains these lines:
|
|
Len = 80
|
|
Msg = 1ca984dcc913344370cf
|
|
MD = 6915ea0eeffb99b9b246a0e34daf3947852684c3d618260119a22835659e4f23d4eb66a15d0affb8e93771578f5e8f25b7a5f2a55f511fb8b96325ba2cd14816
|
|
* use xxd convert the hex message string to binary input for BIO_f_md:
|
|
* echo "1ca984dcc913344370cf" | xxd -r -p | ./BIO_f_md
|
|
* and then verify the output matches MD above.
|
|
*/
|
|
|
|
#include <string.h>
|
|
#include <stdio.h>
|
|
#include <openssl/err.h>
|
|
#include <openssl/bio.h>
|
|
#include <openssl/evp.h>
|
|
|
|
/*-
|
|
* This demonstration will show how to digest data using
|
|
* a BIO configured with a message digest
|
|
* A message digest name may be passed as an argument.
|
|
* The default digest is SHA3-512
|
|
*/
|
|
|
|
int main(int argc, char * argv[])
|
|
{
|
|
int ret = EXIT_FAILURE;
|
|
OSSL_LIB_CTX *library_context = NULL;
|
|
BIO *input = NULL;
|
|
BIO *bio_digest = NULL, *reading = NULL;
|
|
EVP_MD *md = NULL;
|
|
unsigned char buffer[512];
|
|
size_t digest_size;
|
|
char *digest_value = NULL;
|
|
int j;
|
|
|
|
input = BIO_new_fd(fileno(stdin), 1);
|
|
if (input == NULL) {
|
|
fprintf(stderr, "BIO_new_fd() for stdin returned NULL\n");
|
|
goto cleanup;
|
|
}
|
|
library_context = OSSL_LIB_CTX_new();
|
|
if (library_context == NULL) {
|
|
fprintf(stderr, "OSSL_LIB_CTX_new() returned NULL\n");
|
|
goto cleanup;
|
|
}
|
|
|
|
/*
|
|
* Fetch a message digest by name
|
|
* The algorithm name is case insensitive.
|
|
* See providers(7) for details about algorithm fetching
|
|
*/
|
|
md = EVP_MD_fetch(library_context, "SHA3-512", NULL);
|
|
if (md == NULL) {
|
|
fprintf(stderr, "EVP_MD_fetch did not find SHA3-512.\n");
|
|
goto cleanup;
|
|
}
|
|
digest_size = EVP_MD_get_size(md);
|
|
digest_value = OPENSSL_malloc(digest_size);
|
|
if (digest_value == NULL) {
|
|
fprintf(stderr, "Can't allocate %lu bytes for the digest value.\n", (unsigned long)digest_size);
|
|
goto cleanup;
|
|
}
|
|
/* Make a bio that uses the digest */
|
|
bio_digest = BIO_new(BIO_f_md());
|
|
if (bio_digest == NULL) {
|
|
fprintf(stderr, "BIO_new(BIO_f_md()) returned NULL\n");
|
|
goto cleanup;
|
|
}
|
|
/* set our bio_digest BIO to digest data */
|
|
if (BIO_set_md(bio_digest, md) != 1) {
|
|
fprintf(stderr, "BIO_set_md failed.\n");
|
|
goto cleanup;
|
|
}
|
|
/*-
|
|
* We will use BIO chaining so that as we read, the digest gets updated
|
|
* See the man page for BIO_push
|
|
*/
|
|
reading = BIO_push(bio_digest, input);
|
|
|
|
while (BIO_read(reading, buffer, sizeof(buffer)) > 0)
|
|
;
|
|
|
|
/*-
|
|
* BIO_gets must be used to calculate the final
|
|
* digest value and then copy it to digest_value.
|
|
*/
|
|
if (BIO_gets(bio_digest, digest_value, digest_size) != digest_size) {
|
|
fprintf(stderr, "BIO_gets(bio_digest) failed\n");
|
|
goto cleanup;
|
|
}
|
|
for (j = 0; j < digest_size; j++) {
|
|
fprintf(stdout, "%02x", (unsigned char)digest_value[j]);
|
|
}
|
|
fprintf(stdout, "\n");
|
|
ret = EXIT_SUCCESS;
|
|
|
|
cleanup:
|
|
if (ret != EXIT_SUCCESS)
|
|
ERR_print_errors_fp(stderr);
|
|
|
|
OPENSSL_free(digest_value);
|
|
BIO_free(input);
|
|
BIO_free(bio_digest);
|
|
EVP_MD_free(md);
|
|
OSSL_LIB_CTX_free(library_context);
|
|
|
|
return ret;
|
|
}
|