LibTom 加密之SHA1

下面的C程序实现的功能：
将pInData数组内数据进行hash-sha1运算，得到摘要值hash

首先引入头文件

#include "tomcrypt.h"  
#pragma comment (lib,"tomcrypt.lib")

声明变量（hash状态、执行返回结果、hash结果存放数组）, 赋初值

hash_state      md;
int             ret = 0;
int             hash_index = 0;
unsigned  long	hashLen = 0;
unsigned  char	hash[MAXBLOCKSIZE];

memset(hash,0,MAXBLOCKSIZE);

unsigned  char	pInData[1024] = {0}; 
unsigned  long	InDataLen = 1024;

//待HASH数据
memcpy(pInData,"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz",52);

注册hash函数

hash_index = register_hash(&sha1_desc);
if (hash_index == -1)
{
	printf_s("register_hash err\n"");
	return -1;
}

HASH后数据长160bit,20字节

hashLen = hash_descriptor[hash_index].hashsize;

HASH流程(init->process->done)

ret = hash_descriptor[hash_index].init(&md);
if (ret!=CRYPT_OK)
{
	printf_s("hash_descriptor.init err\n"); 
	return -1;
}
ret = hash_descriptor[hash_index].process(&md,pInData,InDataLen);
if (ret!=CRYPT_OK)
{
	printf_s("hash_descriptor.process err\n"); 
	return -1;
}
ret = hash_descriptor[hash_index].done(&md, hash);
if (ret!=CRYPT_OK)
{
	printf_s("hash_descriptor.done err\n"); 
	return -1;
}

打印hash结果

printf_s("消息摘要长度:\n%d\n\n",hashLen);

printf_s("消息摘要:\n");
for (int i=0;i<hashLen;i++)
{
	printf_s("%x",hash[i]);
}
printf_s("\n\n");

查看GitHub 完整代码

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