Introduction from Wikipedia:
Triple DES, also known as 3DES, is a mode of the
DES
encryption algorithm
that uses three 56-bit
key
pairs
Data is encrypted three times.
The Data Encryption Standard
(DES) is a long-standing encryption standard in the United States that uses
symmetric key
cryptography and was standardized by the
ANSI
organization as ANSI X.3.92 in 1981 . DES uses a 56-bit key and cipher block method, and in the cipher block method, text is divided into 64-bit sized text blocks and then encrypted. 3DES is more secure than the original DES.
3DES (i.e. Triple DES) is an
encryption
(in 1999, NIST designated 3-DES as a transitional encryption standard). The specific implementation of the encryption algorithm is as follows: Let Ek() and Dk() represent the DES algorithm The encryption and decryption process of , K represents the
key
, M represents the plaintext, and C represents the ciphertext, as follows:
The 3DES encryption process is: C=Ek3(Dk2(Ek1(M)))
The 3DES decryption process is: M=Dk1(EK2(Dk3(C)))
Code:
import java.security.NoSuchAlgorithmException;
import java.security.spec.AlgorithmParameterSpec;
import javax.crypto.Cipher;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.lang3.StringUtils;
import jodd.util.Base64;
public class TripleDES {
// algorithm name
public static final String KEY_ALGORITHM = "DESede";
// Algorithm name/encryption mode/padding method
public static final String CIPHER_ALGORITHM_CBC = "DESede/CBC/PKCS5Padding";
public static byte[] DefaultIV = {0x12, 0x34, 0x56, 0x78, (byte) 0x90, (byte) 0xAB, (byte) 0xCD, (byte) 0xEF};
private SecretKey secretKey;
private Cipher cipher;
private byte[] encryptData;
private AlgorithmParameterSpec iv;
private static TripleDES tripleDES = null;
public static TripleDES getInstance(String key) throws Exception {
if (tripleDES == null) {
synchronized (TripleDES.class) {
tripleDES = new TripleDES(key,"CBC");
}
}
return tripleDES;
}
public TripleDES(String key,String mode) {
if("CBC".equals(mode)) {
if (StringUtils.isEmpty(key)) {
key = "GDAU8xpYaWivfJS1R5NGFotZwY8tt6KH";
}
byte[] keyData = Base64.decode(key);
try {
cipher = Cipher.getInstance(CIPHER_ALGORITHM_CBC);
} catch (NoSuchAlgorithmException e) {
e.printStackTrace ();
} catch (NoSuchPaddingException e) {
e.printStackTrace ();
}
secretKey = new SecretKeySpec(keyData, KEY_ALGORITHM);
iv = new IvParameterSpec(DefaultIV);
}
}
/**
* Initial vector 8 bits
* @return
*/
byte[] getIV() {
return DefaultIV;
}
/**
* 加密
* @param str
* @return byte[]
* @throws Exception
*/
public byte[] encrypt(String str) throws Exception {
cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);
return encryptData = cipher.doFinal(str.getBytes("utf-8"));
}
/**
* 解密
* @param encrypt
* @return byte[]
* @throws Exception
*/
public byte[] decrypt(byte[] encrypt) throws Exception {
cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);
return encryptData = cipher.doFinal(encrypt);
}
/**
* TripleDes三层加密,并且base64编码
* 默认utf-8
* @param str
* @return String
* @throws Exception
*/
public String encryptStr(String str) throws Exception {
cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);
encryptData = cipher.doFinal(str.getBytes("utf-8"));
return Base64.encodeToString(encryptData);
}
/**
* 解密 返回字符串 ,,并且base64解码
* 默认utf-8
* @param encrypt
* @return String
* @throws Exception
*/
public String decryptStr(String data) throws Exception {
byte[] encrypt = Base64.decode(data);
cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);
encryptData = cipher.doFinal(encrypt);
return new String(encryptData,"UTF-8");
}
public static void main(String[] args) throws Exception {
TripleDES tripleDES = TripleDES.getInstance("dgKU8xpYaRivfJS1R5NGFotZwY6lI6jI");
Test1();
// String data = "\"address\":\"北京市\",\"applyNo\":\"09ecd729d09e461bb9ad0329ecddf163\",\"applyReason\":\"测试\",\"creditAmount\":10,\"creditReason\":\"系统通过\",\"ext\":{},\"idCard\":\"101123\",\"jdPin\":\"washingtin\",\"name\":\"X_man\",\"phone\":\"15520059911\",\"reqDate\":\"20160823135900\",\"returnParams\":\"\",\"riskRemark\":\"无\"";
// System.out.println(HashUtils.MD5(data));
// tripleDES.testEncrypt();
tripleDES.testDecrypt();
}
}