openssl AES加密

此代码不涉及ECB和CBC等关联加密

#include <stdio.h>
#include <string.h>
#include <stdlib.h> 

#include <openssl/aes.h>

#include <openssl/applink.c>
#pragma comment(lib, "libeay32.lib")
#pragma comment(lib, "ssleay32.lib") 

int main ()
{
	//aes是块加密,每块16Byte(128bit)
	char input[] = "0000000000000000";
	unsigned char output[256];
	unsigned  char decode[64];
	//密钥，长度可选3种128bit，192bit，256bit，不管密钥长度多长加密出来的结果都是128bit
	//这里用的是128bit的密钥长度
	char userKey[]="1234567890123456";
	AES_KEY key;

	AES_set_encrypt_key((unsigned char*)userKey, 128, &key);//构造加密密钥

	AES_encrypt((unsigned char *)input, output, &key);

	//30303030303030303030303030303030 加密结果: 93bc0fabf6c85e9e1c53d78885373dc7

	AES_encrypt((unsigned char *)input,output,&key);

	AES_set_decrypt_key((unsigned char*)userKey, 128, &key);//构造解密密钥
	AES_decrypt(output,decode,&key);

	return 0;
}