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https://github.com/CloverHackyColor/CloverBootloader.git
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184 lines
6.3 KiB
C
184 lines
6.3 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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/*
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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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*/
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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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* the soliloqy from Hamlet scene 1 act 3
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* The soliloqy is split into two parts to demonstrate using EVP_DigestUpdate
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* more than once.
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*/
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const char * hamlet_1 =
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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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const char * hamlet_2 =
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"The insolence of Office, and the spurns\n"
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"That patient merit of the'unworthy takes,\n"
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"When he himself might his Quietas make\n"
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"With a bare bodkin? Who would fardels bear,\n"
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"To grunt and sweat under a weary life,\n"
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"But that the dread of something after death,\n"
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"The undiscovered country, from whose bourn\n"
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"No traveller returns, puzzles the will,\n"
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"And makes us rather bear those ills we have,\n"
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"Then fly to others we know not of?\n"
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"Thus conscience does make cowards of us all,\n"
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"And thus the native hue of Resolution\n"
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"Is sickled o'er with the pale cast of Thought,\n"
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"And enterprises of great pith and moment,\n"
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"With this regard their currents turn awry,\n"
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"And lose the name of Action. Soft you now,\n"
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"The fair Ophelia? Nymph in thy Orisons\n"
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"Be all my sins remember'd.\n"
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;
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/* The known value of the SHA3-512 digest of the above soliloqy */
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const unsigned char known_answer[] = {
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0xbb, 0x69, 0xf8, 0x09, 0x9c, 0x2e, 0x00, 0x3d,
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0xa4, 0x29, 0x5f, 0x59, 0x4b, 0x89, 0xe4, 0xd9,
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0xdb, 0xa2, 0xe5, 0xaf, 0xa5, 0x87, 0x73, 0x9d,
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0x83, 0x72, 0xcf, 0xea, 0x84, 0x66, 0xc1, 0xf9,
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0xc9, 0x78, 0xef, 0xba, 0x3d, 0xe9, 0xc1, 0xff,
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0xa3, 0x75, 0xc7, 0x58, 0x74, 0x8e, 0x9c, 0x1d,
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0x14, 0xd9, 0xdd, 0xd1, 0xfd, 0x24, 0x30, 0xd6,
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0x81, 0xca, 0x8f, 0x78, 0x29, 0x19, 0x9a, 0xfe,
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};
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int demonstrate_digest(void)
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{
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OSSL_LIB_CTX *library_context;
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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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int j;
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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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goto cleanup;
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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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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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goto cleanup;
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}
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/* Digest parts one and two of the soliloqy */
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if (EVP_DigestUpdate(digest_context, hamlet_1, strlen(hamlet_1)) != 1) {
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fprintf(stderr, "EVP_DigestUpdate(hamlet_1) failed.\n");
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goto cleanup;
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}
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if (EVP_DigestUpdate(digest_context, hamlet_2, strlen(hamlet_2)) != 1) {
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fprintf(stderr, "EVP_DigestUpdate(hamlet_2) failed.\n");
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goto cleanup;
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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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for (j=0; j<digest_length; j++) {
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fprintf(stdout, "%02x", digest_value[j]);
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}
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fprintf(stdout, "\n");
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/* Check digest_value against the known answer */
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if ((size_t)digest_length != sizeof(known_answer)) {
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fprintf(stdout, "Digest length(%d) not equal to known answer length(%lu).\n",
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digest_length, sizeof(known_answer));
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} else if (memcmp(digest_value, known_answer, digest_length) != 0) {
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for (j=0; j<sizeof(known_answer); j++) {
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fprintf(stdout, "%02x", known_answer[j] );
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}
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fprintf(stdout, "\nDigest does not match known answer\n");
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} else {
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fprintf(stdout, "Digest computed properly.\n");
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result = 1;
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}
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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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return demonstrate_digest() == 0;
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}
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