再次利用openssl来计算sha1, sha224, sha256, sha384, sha512

       请按照之前博文的介绍配置openssl环境。代码如下：

#include <iostream>
#include <openssl/sha.h> 
#include <openssl/crypto.h>  // OPENSSL_cleanse
#pragma comment(lib, "libeay32.lib")
#pragma comment(lib, "ssleay32.lib")  // 在本程序中， 可以注释掉这句
using namespace std;

const char *orgStr = "hello"; //待哈希的串

// 打印前， 有必要转换
void printHash(unsigned char *md, int len)
{
	int i = 0;
	for (i = 0; i < len; i++)
	{
		printf("%02x", md[i]);
	}

	printf("\n");
}

void myHash1()
{
	SHA_CTX c;
	unsigned char md[SHA_DIGEST_LENGTH];
	SHA1((unsigned char *)orgStr, strlen(orgStr), md);
	printHash(md, SHA_DIGEST_LENGTH);

	SHA1_Init(&c);
	SHA1_Update(&c, orgStr, strlen(orgStr));
	SHA1_Final(md, &c);
	OPENSSL_cleanse(&c, sizeof(c));
	printHash(md, SHA_DIGEST_LENGTH);
}

void myHash224()
{
	SHA256_CTX c;
	unsigned char md[SHA224_DIGEST_LENGTH];
	SHA224((unsigned char *)orgStr, strlen(orgStr), md);
	printHash(md, SHA224_DIGEST_LENGTH);

	SHA224_Init(&c);
	SHA224_Update(&c, orgStr, strlen(orgStr));
	SHA224_Final(md, &c);
	OPENSSL_cleanse(&c, sizeof(c));
	printHash(md, SHA224_DIGEST_LENGTH);
}

void myHash256()
{
	SHA256_CTX c;
	unsigned char md[SHA256_DIGEST_LENGTH];
	SHA256((unsigned char *)orgStr, strlen(orgStr), md);
	printHash(md, SHA256_DIGEST_LENGTH);

	SHA256_Init(&c);
	SHA256_Update(&c, orgStr, strlen(orgStr));
	SHA256_Final(md, &c);
	OPENSSL_cleanse(&c, sizeof(c));
	printHash(md, SHA256_DIGEST_LENGTH);
}

void myHash384()
{
	SHA512_CTX c;
	unsigned char md[SHA384_DIGEST_LENGTH];
	SHA384((unsigned char *)orgStr, strlen(orgStr), md);
	printHash(md, SHA384_DIGEST_LENGTH);

	SHA384_Init(&c);
	SHA384_Update(&c, orgStr, strlen(orgStr));
	SHA384_Final(md, &c);
	OPENSSL_cleanse(&c, sizeof(c));
	printHash(md, SHA384_DIGEST_LENGTH);
}

void myHash512()
{
	SHA512_CTX c;
	unsigned char md[SHA512_DIGEST_LENGTH];
	SHA512((unsigned char *)orgStr, strlen(orgStr), md);
	printHash(md, SHA512_DIGEST_LENGTH);

	SHA512_Init(&c);
	SHA512_Update(&c, orgStr, strlen(orgStr));
	SHA512_Final(md, &c);
	OPENSSL_cleanse(&c, sizeof(c));
	printHash(md, SHA512_DIGEST_LENGTH);
}

int main()
{
	myHash1();
	myHash224();
	myHash256();
	myHash384();
	myHash512();

	return 0;
}

     与其他工具相比， 结果一致。