mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-12-05 13:33:33 +01:00
146 lines
4.2 KiB
C
146 lines
4.2 KiB
C
/*
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* Copyright 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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#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 NIST's GCM Test Vectors
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* http://csrc.nist.gov/groups/STM/cavp/
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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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0x77, 0xbe, 0x63, 0x70, 0x89, 0x71, 0xc4, 0xe2,
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0x40, 0xd1, 0xcb, 0x79, 0xe8, 0xd7, 0x7f, 0xeb
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};
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/*
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* The initialisation vector (IV) is better not being hard coded too.
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* Repeating password/IV pairs compromises the integrity of GMAC.
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* The IV is not considered secret information and is safe to store with
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* an encrypted password.
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*/
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static unsigned char iv[] = {
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0xe0, 0xe0, 0x0f, 0x19, 0xfe, 0xd7, 0xba,
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0x01, 0x36, 0xa7, 0x97, 0xf3
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};
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static unsigned char data[] = {
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0x7a, 0x43, 0xec, 0x1d, 0x9c, 0x0a, 0x5a, 0x78,
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0xa0, 0xb1, 0x65, 0x33, 0xa6, 0x21, 0x3c, 0xab
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};
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static const unsigned char expected_output[] = {
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0x20, 0x9f, 0xcc, 0x8d, 0x36, 0x75, 0xed, 0x93,
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0x8e, 0x9c, 0x71, 0x66, 0x70, 0x9d, 0xd9, 0x46
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};
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/*
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* A property query used for selecting the GMAC implementation and the
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* underlying GCM mode cipher.
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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 rv = 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[16];
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OSSL_PARAM params[4], *p = params;
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OSSL_LIB_CTX *library_context = NULL;
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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 GMAC implementation */
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mac = EVP_MAC_fetch(library_context, "GMAC", 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 GMAC 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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/* GMAC requries a GCM mode cipher to be specified */
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*p++ = OSSL_PARAM_construct_utf8_string(OSSL_MAC_PARAM_CIPHER,
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"AES-128-GCM", 0);
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/*
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* If a non-default property query is required when fetching the GCM mode
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* cipher, it needs to be specified too.
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*/
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if (propq != NULL)
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*p++ = OSSL_PARAM_construct_utf8_string(OSSL_MAC_PARAM_PROPERTIES,
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propq, 0);
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/* Set the initialisation vector (IV) */
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*p++ = OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_IV,
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iv, sizeof(iv));
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*p = OSSL_PARAM_construct_end();
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/* Initialise the GMAC 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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rv = 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 (rv != EXIT_SUCCESS)
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ERR_print_errors_fp(stderr);
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return rv;
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}
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