Java源碼：

import java.security.Security;

import javax.crypto.Cipher;

import javax.crypto.SecretKey;

import javax.crypto.spec.SecretKeySpec;

public class ThreeDES {

private static final String Algorithm = "DESede"; //定義 加密算法,可用 DES,DESede,Blowfish

//keybyte為加密密鑰，長度為24字節

//src為被加密的數據緩沖區(源)

public static byte[] encryptMode(byte[] keybyte, byte[] src) {

try {

//生成密鑰

SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);

//加密

Cipher c1 = Cipher.getInstance(Algorithm);

c1.init(Cipher.ENCRYPT_MODE, deskey);

return c1.doFinal(src);

} catch (java.security.NoSuchAlgorithmException e1) {

e1.printStackTrace();

} catch (javax.crypto.NoSuchPaddingException e2) {

e2.printStackTrace();

} catch (java.lang.Exception e3) {

e3.printStackTrace();

}

return null;

}

//keybyte為加密密鑰，長度為24字節

//src為加密后的緩沖區

public static byte[] decryptMode(byte[] keybyte, byte[] src) {

try {

//生成密鑰

SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);

//解密

Cipher c1 = Cipher.getInstance(Algorithm);

c1.init(Cipher.DECRYPT_MODE, deskey);

return c1.doFinal(src);

} catch (java.security.NoSuchAlgorithmException e1) {

e1.printStackTrace();

} catch (javax.crypto.NoSuchPaddingException e2) {

e2.printStackTrace();

} catch (java.lang.Exception e3) {

e3.printStackTrace();

}

return null;

}

//轉換成十六進制字符串

public static String byte2hex(byte[] b) {

String hs="";

String stmp="";

for (int n=0;n

stmp=(java.lang.Integer.toHexString(b[n] & 0XFF));

if (stmp.length()==1) hs=hs+"0"+stmp;

else hs=hs+stmp;

if (n

}

return hs.toUpperCase();

}

總結

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