AES

安全加密技術





import java.security.MessageDigest;
import java.util.Arrays;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
public class AES
{
static String IV = "AAAAAAAAAAAAAAAA";
static String plaintext = "test text 123\0\0\0"; //因為AES需要16字元，在這邊要把欲加密字串加至16字元

static byte[] keys;

public static void main(String [] args)
{
try
{    
System.out.println("===AES範例===");
System.out.println("plain:   " + plaintext);

byte[] cipher = encrypt(plaintext);

System.out.print("cipher:  ");
for (int i=0; i<cipher.length; i++)
System.out.print(new Integer(cipher[i])+" ");
System.out.println("");

String decrypted = decrypt(cipher);

System.out.println("decrypt: " + decrypted);

}
catch (Exception e)
{
e.printStackTrace();
}
}

public static byte[] encrypt(String plainText) throws Exception //加密
{
KeyGenerator keyG = KeyGenerator.getInstance("AES");
keyG.init(128);
SecretKey secuK = keyG.generateKey(); //取得KEY

keys = secuK.getEncoded();

String str=new String(keys, "iso-8859-1");;

System.out.print("Key:     ");
for (int i=0; i<keys.length; i++)
System.out.print(new Integer(keys[i])+" ");
System.out.println();

Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding", "SunJCE");
SecretKeySpec key = new SecretKeySpec(keys, "AES");
cipher.init(Cipher.ENCRYPT_MODE, key,new IvParameterSpec(IV.getBytes("UTF-8")));
return cipher.doFinal(plainText.getBytes("UTF-8"));
}

public static String decrypt(byte[] cipherText) throws Exception //解密
{
Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding", "SunJCE");
SecretKeySpec key = new SecretKeySpec(keys, "AES");
cipher.init(Cipher.DECRYPT_MODE, key,new IvParameterSpec(IV.getBytes("UTF-8")));
return new String(cipher.doFinal(cipherText),"UTF-8");
}
}

執行結果

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