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Copy pathDESedeHelper.java
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115 lines (94 loc) · 3.21 KB
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package com.java.alogrithm.helper;
import java.security.MessageDigest;
import java.util.Arrays;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import com.java.alogrithm.utils.Base64;
/**
* 3DES加解密
*
* @author steven-pan
*
*/
public class DESedeHelper {
private static final String ALGORITHM_MD5 = "md5";
private static final String ALGORITHM_DESEDE = "DESede";
private static final String CIPHER_TRANSFORMATION = "DESede/CBC/PKCS5Padding";
private static final String CHARSET_UTF_8 = "UTF-8";
/**
* test
*
* @param args
* @throws Exception
*/
public static void main(String[] args) throws Exception {
System.out.println("DESede加解密测试：");
final String privateKey = "HG58YZ3CR9HG58YZ3CR9HG58YZ3CR9";
String text = "hello world!";// origin data
System.out.println("加密前:" + text);
byte[] codedtext = DESedeHelper.encrypt(text, privateKey);
String codedtextb = Base64.encode(codedtext);// data transfer as text
System.out.println("Base64 format:" + codedtextb);
codedtext = Base64.decode(codedtextb);
String decodedtext = DESedeHelper.decrypt(codedtext, privateKey);
System.out.println("解密后:" + decodedtext); // This correctly shows "hello world!"
}
/**
* encoded message
*
* @param message
* origin message
* @param sKey
* origin privateKey
* @return
* @throws Exception
*/
public static byte[] encrypt(String message, String sKey) throws Exception {
final byte[] keyBytes = getKeyBytes(sKey);
final SecretKey key = new SecretKeySpec(keyBytes, ALGORITHM_DESEDE);
final IvParameterSpec iv = new IvParameterSpec(new byte[8]);
final Cipher cipher = Cipher.getInstance(CIPHER_TRANSFORMATION);
cipher.init(Cipher.ENCRYPT_MODE, key, iv);
final byte[] plainTextBytes = message.getBytes(CHARSET_UTF_8);
final byte[] cipherText = cipher.doFinal(plainTextBytes);
return cipherText;
}
/**
* decode from encoded message
*
* @param message
* encoded message
* @param sKey
* origin privateKey
* @return
* @throws Exception
*/
public static String decrypt(byte[] message, String sKey) throws Exception {
final byte[] keyBytes = getKeyBytes(sKey);
final SecretKey key = new SecretKeySpec(keyBytes, ALGORITHM_DESEDE);
final IvParameterSpec iv = new IvParameterSpec(new byte[8]);
final Cipher decipher = Cipher.getInstance(CIPHER_TRANSFORMATION);
decipher.init(Cipher.DECRYPT_MODE, key, iv);
final byte[] plainText = decipher.doFinal(message);
return new String(plainText, CHARSET_UTF_8);
}
/**
* generate keyBytes
*
* @param sKey
* origin privateKey
* @return
* @throws Exception
*/
private static byte[] getKeyBytes(String sKey) throws Exception {
final MessageDigest md = MessageDigest.getInstance(ALGORITHM_MD5);
final byte[] digestOfPassword = md.digest(sKey.getBytes(CHARSET_UTF_8));
final byte[] keyBytes = Arrays.copyOf(digestOfPassword, 24);
for (int j = 0, k = 16; j < 8;) {
keyBytes[k++] = keyBytes[j++];
}
return keyBytes;
}
}