mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-12-04 13:23:26 +01:00
167 lines
5.4 KiB
C
167 lines
5.4 KiB
C
/*-
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* Copyright 2022 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_MAC_ methods to calculate
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* a HMAC of static buffers
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*/
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#include <string.h>
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#include <stdio.h>
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#include <openssl/crypto.h>
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#include <openssl/core_names.h>
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#include <openssl/err.h>
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#include <openssl/evp.h>
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#include <openssl/hmac.h>
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#include <openssl/params.h>
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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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0x25, 0xfd, 0x12, 0x99, 0xdf, 0xad, 0x1a, 0x03,
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0x0a, 0x81, 0x3c, 0x2d, 0xcc, 0x05, 0xd1, 0x5c,
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0x17, 0x7a, 0x36, 0x73, 0x17, 0xef, 0x41, 0x75,
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0x71, 0x18, 0xe0, 0x1a, 0xda, 0x99, 0xc3, 0x61,
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0x38, 0xb5, 0xb1, 0xe0, 0x82, 0x2c, 0x70, 0xa4,
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0xc0, 0x8e, 0x5e, 0xf9, 0x93, 0x9f, 0xcf, 0xf7,
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0x32, 0x4d, 0x0c, 0xbd, 0x31, 0x12, 0x0f, 0x9a,
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0x15, 0xee, 0x82, 0xdb, 0x8d, 0x29, 0x54, 0x14,
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};
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static const unsigned char data[] =
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"To be, or not to be, that is the question,\n"
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"Whether tis nobler in the minde to suffer\n"
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"The ſlings and arrowes of outragious fortune,\n"
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"Or to take Armes again in a sea of troubles,\n"
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"And by opposing, end them, to die to sleep;\n"
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"No more, and by a sleep, to say we end\n"
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"The heart-ache, and the thousand natural shocks\n"
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"That flesh is heir to? tis a consumation\n"
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"Devoutly to be wished. To die to sleep,\n"
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"To sleepe, perchance to dreame, Aye, there's the rub,\n"
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"For in that sleep of death what dreams may come\n"
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"When we haue shuffled off this mortal coil\n"
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"Must give us pause. There's the respect\n"
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"That makes calamity of so long life:\n"
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"For who would bear the Ships and Scorns of time,\n"
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"The oppressor's wrong, the proud man's Contumely,\n"
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"The pangs of dispised love, the Law's delay,\n"
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;
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/* The known value of the HMAC/SHA3-512 MAC of the above soliloqy */
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static const unsigned char expected_output[] = {
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0x3b, 0x77, 0x5f, 0xf1, 0x4f, 0x9e, 0xb9, 0x23,
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0x8f, 0xdc, 0xa0, 0x68, 0x15, 0x7b, 0x8a, 0xf1,
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0x96, 0x23, 0xaa, 0x3c, 0x1f, 0xe9, 0xdc, 0x89,
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0x11, 0x7d, 0x58, 0x07, 0xe7, 0x96, 0x17, 0xe3,
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0x44, 0x8b, 0x03, 0x37, 0x91, 0xc0, 0x6e, 0x06,
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0x7c, 0x54, 0xe4, 0xa4, 0xcc, 0xd5, 0x16, 0xbb,
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0x5e, 0x4d, 0x64, 0x7d, 0x88, 0x23, 0xc9, 0xb7,
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0x25, 0xda, 0xbe, 0x4b, 0xe4, 0xd5, 0x34, 0x30,
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};
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/*
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* A property query used for selecting the MAC implementation.
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*/
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static const char *propq = NULL;
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int main(void)
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{
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int rv = EXIT_FAILURE;
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OSSL_LIB_CTX *library_context = NULL;
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EVP_MAC *mac = NULL;
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EVP_MAC_CTX *mctx = NULL;
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EVP_MD_CTX *digest_context = NULL;
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unsigned char *out = NULL;
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size_t out_len = 0;
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OSSL_PARAM params[4], *p = params;
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char digest_name[] = "SHA3-512";
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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 HMAC implementation */
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mac = EVP_MAC_fetch(library_context, "HMAC", 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 HMAC 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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/* The underlying digest to be used */
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*p++ = OSSL_PARAM_construct_utf8_string(OSSL_MAC_PARAM_DIGEST, digest_name,
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sizeof(digest_name));
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*p = OSSL_PARAM_construct_end();
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/* Initialise the HMAC 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 a call to the final with a NULL buffer to get the length of the MAC */
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if (!EVP_MAC_final(mctx, NULL, &out_len, 0)) {
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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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out = OPENSSL_malloc(out_len);
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if (out == NULL) {
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fprintf(stderr, "malloc 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, out_len)) {
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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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rv = EXIT_SUCCESS;
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end:
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if (rv != EXIT_SUCCESS)
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ERR_print_errors_fp(stderr);
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/* OpenSSL free functions will ignore NULL arguments */
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OPENSSL_free(out);
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EVP_MD_CTX_free(digest_context);
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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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return rv;
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}
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