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130 lines
3.8 KiB
C
130 lines
3.8 KiB
C
/*
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* Copyright 2021-2023 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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#include <stdio.h>
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#include <stdlib.h>
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#include <openssl/core_names.h>
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#include <openssl/evp.h>
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#include <openssl/params.h>
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#include <openssl/err.h>
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/*
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* Taken from the test vector from the paper "SipHash: a fast short-input PRF".
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* https://www.aumasson.jp/siphash/siphash.pdf
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*/
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/*
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* Hard coding the key into an application is very bad.
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* It is done here solely for educational purposes.
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*/
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static unsigned char key[] = {
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0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
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0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f
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};
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static unsigned char data[] = {
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0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
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0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e
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};
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static const unsigned char expected_output[] = {
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0xe5, 0x45, 0xbe, 0x49, 0x61, 0xca, 0x29, 0xa1
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};
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/*
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* A property query used for selecting the SIPHASH implementation.
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*/
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static char *propq = NULL;
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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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EVP_MAC *mac = NULL;
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EVP_MAC_CTX *mctx = NULL;
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unsigned char out[8];
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OSSL_PARAM params[4], *p = params;
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OSSL_LIB_CTX *library_context = NULL;
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unsigned int digest_len = 8, c_rounds = 2, d_rounds = 4;
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size_t out_len = 0;
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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 end;
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}
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/* Fetch the SipHash implementation */
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mac = EVP_MAC_fetch(library_context, "SIPHASH", propq);
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if (mac == NULL) {
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fprintf(stderr, "EVP_MAC_fetch() returned NULL\n");
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goto end;
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}
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/* Create a context for the SipHash operation */
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mctx = EVP_MAC_CTX_new(mac);
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if (mctx == NULL) {
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fprintf(stderr, "EVP_MAC_CTX_new() returned NULL\n");
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goto end;
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}
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/* SipHash can support either 8 or 16-byte digests. */
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*p++ = OSSL_PARAM_construct_uint(OSSL_MAC_PARAM_SIZE, &digest_len);
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/*
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* The number of C-rounds and D-rounds is configurable. Standard SipHash
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* uses values of 2 and 4 respectively. The following lines are unnecessary
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* as they set the default, but demonstrate how to change these values.
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*/
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*p++ = OSSL_PARAM_construct_uint(OSSL_MAC_PARAM_C_ROUNDS, &c_rounds);
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*p++ = OSSL_PARAM_construct_uint(OSSL_MAC_PARAM_D_ROUNDS, &d_rounds);
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*p = OSSL_PARAM_construct_end();
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/* Initialise the SIPHASH operation */
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if (!EVP_MAC_init(mctx, key, sizeof(key), params)) {
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fprintf(stderr, "EVP_MAC_init() failed\n");
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goto end;
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}
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/* Make one or more calls to process the data to be authenticated */
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if (!EVP_MAC_update(mctx, data, sizeof(data))) {
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fprintf(stderr, "EVP_MAC_update() failed\n");
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goto end;
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}
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/* Make one call to the final to get the MAC */
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if (!EVP_MAC_final(mctx, out, &out_len, sizeof(out))) {
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fprintf(stderr, "EVP_MAC_final() failed\n");
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goto end;
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}
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printf("Generated MAC:\n");
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BIO_dump_indent_fp(stdout, out, out_len, 2);
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putchar('\n');
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if (out_len != sizeof(expected_output)) {
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fprintf(stderr, "Generated MAC has an unexpected length\n");
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goto end;
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}
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if (CRYPTO_memcmp(expected_output, out, sizeof(expected_output)) != 0) {
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fprintf(stderr, "Generated MAC does not match expected value\n");
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goto end;
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}
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ret = EXIT_SUCCESS;
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end:
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EVP_MAC_CTX_free(mctx);
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EVP_MAC_free(mac);
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OSSL_LIB_CTX_free(library_context);
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if (ret != EXIT_SUCCESS)
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ERR_print_errors_fp(stderr);
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return ret;
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}
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