关于数据加密问题
本文介绍下sha1，256加密方式
同样，先看下各自的头文件
sha1.h
/**
* \file sha1.h
*
* \brief SHA-1 cryptographic hash function
*
* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* This file is part of mbed TLS (https://tls.mbed.org)
*/
#ifndef MBEDTLS_SHA1_H
#define MBEDTLS_SHA1_H
#if !defined(MBEDTLS_CONFIG_FILE)
#include "config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif
#include <stddef.h>
#include <stdint.h>
#if !defined(MBEDTLS_SHA1_ALT)
// Regular implementation
//
#ifdef __cplusplus
extern "C" {
#endif
/**
* \brief SHA-1 context structure
*/
typedef struct
{
uint32_t total[2]; /*!< number of bytes processed */
uint32_t state[5]; /*!< intermediate digest state */
unsigned char buffer[64]; /*!< data block being processed */
}
mbedtls_sha1_context;
/**
* \brief Initialize SHA-1 context
*
* \param ctx SHA-1 context to be initialized
*/
void mbedtls_sha1_init( mbedtls_sha1_context *ctx );
/**
* \brief Clear SHA-1 context
*
* \param ctx SHA-1 context to be cleared
*/
void mbedtls_sha1_free( mbedtls_sha1_context *ctx );
/**
* \brief Clone (the state of) a SHA-1 context
*
* \param dst The destination context
* \param src The context to be cloned
*/
void mbedtls_sha1_clone( mbedtls_sha1_context *dst,
const mbedtls_sha1_context *src );
/**
* \brief SHA-1 context setup
*
* \param ctx context to be initialized
*/
void mbedtls_sha1_starts( mbedtls_sha1_context *ctx );
/**
* \brief SHA-1 process buffer
*
* \param ctx SHA-1 context
* \param input buffer holding the data
* \param ilen length of the input data
*/
void mbedtls_sha1_update( mbedtls_sha1_context *ctx, const unsigned char *input, size_t ilen );
/**
* \brief SHA-1 final digest
*
* \param ctx SHA-1 context
* \param output SHA-1 checksum result
*/
void mbedtls_sha1_finish( mbedtls_sha1_context *ctx, unsigned char output[20] );
/* Internal use */
void mbedtls_sha1_process( mbedtls_sha1_context *ctx, const unsigned char data[64] );
#ifdef __cplusplus
}
#endif
#else /* MBEDTLS_SHA1_ALT */
#include "sha1_alt.h"
#endif /* MBEDTLS_SHA1_ALT */
#ifdef __cplusplus
extern "C" {
#endif
/**
* \brief Output = SHA-1( input buffer )
*
* \param input buffer holding the data
* \param ilen length of the input data
* \param output SHA-1 checksum result
*/
void mbedtls_sha1( const unsigned char *input, size_t ilen, unsigned char output[20] );//直接进行sha1加密api
/**
* \brief Checkup routine
*
* \return 0 if successful, or 1 if the test failed
*/
int mbedtls_sha1_self_test( int verbose );
#ifdef __cplusplus
}
#endif
#endif /* mbedtls_sha1.h */
sha256.h
/**
* \file sha256.h
*
* \brief SHA-224 and SHA-256 cryptographic hash function
*
* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* This file is part of mbed TLS (https://tls.mbed.org)
*/
#ifndef MBEDTLS_SHA256_H
#define MBEDTLS_SHA256_H
#if !defined(MBEDTLS_CONFIG_FILE)
#include "config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif
#include <stddef.h>
#include <stdint.h>
#if !defined(MBEDTLS_SHA256_ALT)
// Regular implementation
//
#ifdef __cplusplus
extern "C" {
#endif
/**
* \brief SHA-256 context structure
*/
typedef struct
{
uint32_t total[2]; /*!< number of bytes processed */
uint32_t state[8]; /*!< intermediate digest state */
unsigned char buffer[64]; /*!< data block being processed */
int is224; /*!< 0 => SHA-256, else SHA-224 */
}
mbedtls_sha256_context;
/**
* \brief Initialize SHA-256 context
*
* \param ctx SHA-256 context to be initialized
*/
void mbedtls_sha256_init( mbedtls_sha256_context *ctx );
/**
* \brief Clear SHA-256 context
*
* \param ctx SHA-256 context to be cleared
*/
void mbedtls_sha256_free( mbedtls_sha256_context *ctx );
/**
* \brief Clone (the state of) a SHA-256 context
*
* \param dst The destination context
* \param src The context to be cloned
*/
void mbedtls_sha256_clone( mbedtls_sha256_context *dst,
const mbedtls_sha256_context *src );
/**
* \brief SHA-256 context setup
*
* \param ctx context to be initialized
* \param is224 0 = use SHA256, 1 = use SHA224
*/
void mbedtls_sha256_starts( mbedtls_sha256_context *ctx, int is224 );
/**
* \brief SHA-256 process buffer
*
* \param ctx SHA-256 context
* \param input buffer holding the data
* \param ilen length of the input data
*/
void mbedtls_sha256_update( mbedtls_sha256_context *ctx, const unsigned char *input,
size_t ilen );
/**
* \brief SHA-256 final digest
*
* \param ctx SHA-256 context
* \param output SHA-224/256 checksum result
*/
void mbedtls_sha256_finish( mbedtls_sha256_context *ctx, unsigned char output[32] );
/* Internal use */
void mbedtls_sha256_process( mbedtls_sha256_context *ctx, const unsigned char data[64] );
#ifdef __cplusplus
}
#endif
#else /* MBEDTLS_SHA256_ALT */
#include "sha256_alt.h"
#endif /* MBEDTLS_SHA256_ALT */
#ifdef __cplusplus
extern "C" {
#endif
/**
* \brief Output = SHA-256( input buffer )
*
* \param input buffer holding the data
* \param ilen length of the input data
* \param output SHA-224/256 checksum result
* \param is224 0 = use SHA256, 1 = use SHA224
*/
void mbedtls_sha256( const unsigned char *input, size_t ilen,
unsigned char output[32], int is224 );
/**
* \brief Checkup routine
*
* \return 0 if successful, or 1 if the test failed
*/
int mbedtls_sha256_self_test( int verbose );
#ifdef __cplusplus
}
#endif
#endif /* mbedtls_sha256.h */
测试程序
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<mbedtls/sha1.h>
#include<mbedtls/sha256.h>
int main(int argc, const char *argv[])
{
unsigned char date[64] = "hello world";
unsigned char outstring_sha1[64];
unsigned char outstring_sha256[64];
unsigned char outsha1[64];
unsigned char outsha256[64];
memset(outstring_sha1,0,64);
memset(outstring_sha256,0,64);
memset(outsha1,0,64);
memset(outsha256,0,64);
int i;
int len;
len = strlen(date);
//先看sha1编码
mbedtls_sha1(date,len,outstring_sha1);
printf("sha1 str:%s\n",outstring_sha1);
for(i=0;outstring_sha1[i]!='\0';i++)
{
snprintf(outsha1+i*2,3,"%02x",outstring_sha1[i]);
}
printf("outsha1:%s\n",outsha1);
//sha256编码
mbedtls_sha256(date,len,outstring_sha256,0);
printf("sha256 str:%s\n",outstring_sha256);
for(i=0;outstring_sha256[i]!='\0';i++)
{
snprintf(outsha256+i*2,3,"%02x",outstring_sha256[i]);
}
printf("outsha256:%s\n",outsha256);
return 0;
}
mbedtls_sha1/mbedtls_sha256 《===》mbedtls_sha1_init，mbedtls_sha1_starts，mbedtls_sha1_update，mbedtls_sha1_finish
两者等价，从md5中仿照过来，没有做单独测试，最后验证。
编译
gcc sha_test.c -o sha1_test -L/usr/local/lib -lmbedcrypto
编译成功
运行
在线工具加密：点击这里
sha1
sha256
注意：此处验证下mbedtls_sha1/mbedtls_sha256 《===》mbedtls_sha1_init，mbedtls_sha1_starts，mbedtls_sha1_update，mbedtls_sha1_finish
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<mbedtls/sha1.h>
#include<mbedtls/sha256.h>
void sha1_encode(unsigned char * date,unsigned char * out)
{
mbedtls_sha1_context sha1_state;
mbedtls_sha1_init(&sha1_state);
mbedtls_sha1_starts(&sha1_state);
mbedtls_sha1_update(&sha1_state,date,strlen(date));
mbedtls_sha1_finish(&sha1_state,out);
}
int main(int argc, const char *argv[])
{
unsigned char date[64] = "hello world";
unsigned char outstring_sha1[64];
unsigned char outstring_sha256[64];
unsigned char outsha1[64];
unsigned char outsha256[64];
//使用组合的api接口进行sha1编码
unsigned char outstring[64];
unsigned char outstr[64];
int i;
int len;
len = strlen(date);
memset(outstring_sha1,0,64);
memset(outstring_sha256,0,64);
memset(outsha1,0,64);
memset(outsha256,0,64);
memset(outstring,0,64);
memset(outstr,0,64);
//先看sha1编码
mbedtls_sha1(date,len,outstring_sha1);
printf("sha1 str:%s\n",outstring_sha1);
for(i=0;outstring_sha1[i]!='\0';i++)
{
snprintf(outsha1+i*2,3,"%02x",outstring_sha1[i]);
}
printf("outsha1:%s\n",outsha1);
#if 0
//sha256编码
mbedtls_sha256(date,len,outstring_sha256,0);
printf("sha256 str:%s\n",outstring_sha256);
for(i=0;outstring_sha256[i]!='\0';i++)
{
snprintf(outsha256+i*2,3,"%02x",outstring_sha256[i]);
}
printf("outsha256:%s\n",outsha256);
#endif
#if 1
sha1_encode(date,outstring);
for(i=0;outstring[i] != '\0';i++)
{
snprintf(outstr+i*2,3,"%02x",outstring[i]);
}
printf("comb api outstr:%s\n",outstr);
#endif
return 0;
}
编译运行结果
所以两种是等价的。
