本人嘗試編寫的測試利用openssl庫函式進行AES中cbc的加解密，至於其它ecb，cfb，ofb等的加解密可套路以下程式。

在貼程式碼之前本人需要分享三個網站，個人認為對理解AES加解密和text的編寫極有用處

#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <openssl/aes.h>

int main()
{
	char Source[100];
	unsigned char *InputData = NULL;
	unsigned char *EncryptData = NULL;
	unsigned char *DecryptData = NULL;
	unsigned char ivec[AES_BLOCK_SIZE];
	unsigned char key[AES_BLOCK_SIZE];
	AES_KEY AesKey;
	
	strcpy(Source, "1234567890abcde");	//the data which need to be encrypted
	int SetDataLen = strlen(Source)+1;
	int DataLen = strlen(Source);
	printf("%d\n",SetDataLen);
	
	//generate own AES key
	for(int iloop = 0;iloop < 16; iloop++)
	{
		key[iloop] = 32 + iloop;
	}
	
	InputData = (unsigned char *)calloc(SetDataLen+1, sizeof(char));   //distribute the place to put datas
	memcpy(InputData, Source, DataLen);          //put source into inputdata
	EncryptData = (unsigned char *)calloc(SetDataLen+1, sizeof(char));
	DecryptData = (unsigned char *)calloc(SetDataLen+1, sizeof(char));
	//set encryption key
	if(AES_set_encrypt_key(key,128,&AesKey)<0)
	{
		printf("Unable to set encryption key in AES...\n");
	} 
	for(int i=0;i<AES_BLOCK_SIZE; i++)
	{
		ivec[i] = 0;            //ivec is like the first IV in the picture
	}
	for(int i = 0; i<16; i++)
	{
		printf("%02x ",InputData[i]);   //for text the data in the Inputdata
	}
	printf("\n");
	
	//encryption
	AES_cbc_encrypt(InputData,EncryptData,SetDataLen,&AesKey,ivec,AES_ENCRYPT);
	for(int i=0; i<16; i++)
	{
		printf("%02X ", *(EncryptData+i));      //put out the number of encryptdata in hex formats
	}
	printf("\n");
	
	// set decryption key
	if(AES_set_decrypt_key(key,128,&AesKey)<0)   //AES_set_decrypt_key is to get the AesKey 
	{
		printf("Unable to set encryption key in AES...\n");
	} 
	for(int i=0;i<AES_BLOCK_SIZE; i++)
	{
		ivec[i] = 0;                 //the ivec to decryption should be same with encryption
	}
	//decryption
	AES_cbc_encrypt(EncryptData, DecryptData,SetDataLen,&AesKey,ivec,AES_DECRYPT);
	for(int i=0; i<16; i++)
	{
		printf("%02X ", DecryptData[i]);     //put out the number of decryptdata in hex formats
	}
	printf("\n");
	//printf("DecryptData:%s...\n", (char *)DecryptData);
	
	
	return 0;
}