mirror of
https://github.com/yuzu-emu/mbedtls.git
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178 lines
4.8 KiB
C++
178 lines
4.8 KiB
C++
/*
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* Hello world example of using the hashing functions of mbed TLS
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*
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* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* This file is part of mbed TLS (https://tls.mbed.org)
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*/
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/*
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* This program illustrates various ways of hashing a buffer.
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* You normally need only one of these two includes.
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*/
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#include "mbedtls/sha256.h" /* SHA-256 only */
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#include "mbedtls/md.h" /* generic interface */
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#if defined(TARGET_LIKE_MBED)
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#include "mbed-drivers/mbed.h"
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#endif
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#include <cstdio>
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static void print_hex(const char *title, const unsigned char buf[], size_t len)
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{
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printf("%s: ", title);
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for (size_t i = 0; i < len; i++)
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printf("%02x", buf[i]);
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printf("\r\n");
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}
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static const char hello_str[] = "Hello, world!";
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static const unsigned char *hello_buffer = (const unsigned char *) hello_str;
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static const size_t hello_len = sizeof hello_str - 1;
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int example(void)
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{
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printf( "\r\n\r\n" );
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/*
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* Method 1: use all-in-one function of a specific SHA-xxx module
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*/
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unsigned char output1[32]; /* SHA-256 outputs 32 bytes */
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/* 0 here means use the full SHA-256, not the SHA-224 variant */
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mbedtls_sha256(hello_buffer, hello_len, output1, 0);
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print_hex("Method 1", output1, sizeof output1);
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/*
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* Method 2: use the streaming interface of a specific SHA-xxx module
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* This is useful if we get our input piecewise.
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*/
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unsigned char output2[32];
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mbedtls_sha256_context ctx2;
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mbedtls_sha256_init(&ctx2);
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mbedtls_sha256_starts(&ctx2, 0); /* SHA-256, not 224 */
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/* Simulating multiple fragments */
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mbedtls_sha256_update(&ctx2, hello_buffer, 1);
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mbedtls_sha256_update(&ctx2, hello_buffer + 1, 1);
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mbedtls_sha256_update(&ctx2, hello_buffer + 2, hello_len - 2);
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mbedtls_sha256_finish(&ctx2, output2);
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print_hex("Method 2", output2, sizeof output2);
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/* Or you could re-use the context by doing mbedtls_sha256_starts() again */
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mbedtls_sha256_free(&ctx2);
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/*
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* Method 3: use all-in-one function of the generice interface
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*/
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unsigned char output3[MBEDTLS_MD_MAX_SIZE]; /* Enough for any hash */
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/* Can easily pick any hash you want, by identifier */
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const mbedtls_md_info_t *md_info3 = mbedtls_md_info_from_type(MBEDTLS_MD_SHA256);
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if (md_info3 == NULL)
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{
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printf("SHA256 not available\r\n");
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return 1;
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}
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int ret3 = mbedtls_md(md_info3, hello_buffer, hello_len, output3);
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if (ret3 != 0)
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{
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printf("md() returned -0x%04X\r\n", -ret3);
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return 1;
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}
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print_hex("Method 3", output3, mbedtls_md_get_size(md_info3));
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/*
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* Method 4: streaming & generic interface
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*/
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unsigned char output4[MBEDTLS_MD_MAX_SIZE]; /* Enough for any hash */
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const mbedtls_md_info_t *md_info4 = mbedtls_md_info_from_type(MBEDTLS_MD_SHA256);
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if (md_info4 == NULL)
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{
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printf("SHA256 not available\r\n");
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return 1;
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}
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mbedtls_md_context_t ctx4;
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mbedtls_md_init(&ctx4);
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int ret4 = mbedtls_md_init_ctx(&ctx4, md_info4);
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if (ret4 != 0)
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{
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printf("md_init_ctx() returned -0x%04X\r\n", -ret4);
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return 1;
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}
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mbedtls_md_starts(&ctx4);
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/* Simulating multiple fragments */
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mbedtls_md_update(&ctx4, hello_buffer, 1);
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mbedtls_md_update(&ctx4, hello_buffer + 1, 1);
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mbedtls_md_update(&ctx4, hello_buffer + 2, hello_len - 2);
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mbedtls_md_finish(&ctx4, output4);
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print_hex("Method 4", output4, mbedtls_md_get_size(md_info4));
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/* Or you could re-use the context by doing mbedtls_md_starts() again */
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mbedtls_md_free(&ctx4);
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printf("\r\nDONE\r\n");
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return 0;
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}
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#if defined(TARGET_LIKE_MBED)
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#include "mbed-drivers/test_env.h"
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#include "minar/minar.h"
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static void run() {
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MBED_HOSTTEST_TIMEOUT(10);
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MBED_HOSTTEST_SELECT(default);
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MBED_HOSTTEST_DESCRIPTION(mbed TLS example on hashing);
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MBED_HOSTTEST_START("MBEDTLS_EX_HASHING");
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MBED_HOSTTEST_RESULT(example() == 0);
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}
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void app_start(int, char*[]) {
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/* Use 115200 bps for consistency with other examples */
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get_stdio_serial().baud(115200);
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minar::Scheduler::postCallback(mbed::util::FunctionPointer0<void>(run).bind());
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}
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#else
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int main() {
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return example();
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}
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#endif
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