java密码加密与解密

package com.gdie.lab.crypt;

import java.io.IOException;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;

import com.sun.org.apache.xerces.internal.impl.dv.util.Base64;

public class CryptUtils {
private static String Algorithm = "DES";
private static byte[] DEFAULT_KEY=new byte[] {-53, 122, -42, -88, -110, -123, -60, -74};
private static String VALUE_ENCODING="UTF-8";

/**
* 生成密钥
*
* @return byte[] 返回生成的密钥
* @throws exception
*             扔出异常.
*/
public static byte[] getSecretKey() throws Exception {
KeyGenerator keygen = KeyGenerator.getInstance(Algorithm);
SecretKey deskey = keygen.generateKey();
// if (debug ) System.out.println ("生成密钥:"+byte2hex (deskey.getEncoded
// ()));
return deskey.getEncoded();

}

/**
* 将指定的数据根据提供的密钥进行加密
*
* @param input
*            需要加密的数据
* @param key
*            密钥
* @return byte[] 加密后的数据
* @throws Exception
*/
public static byte[] encryptData(byte[] input, byte[] key) throws Exception {
SecretKey deskey = new javax.crypto.spec.SecretKeySpec(key, Algorithm);
// if (debug )
// {
// System.out.println ("加密前的二进串:"+byte2hex (input ));
// System.out.println ("加密前的字符串:"+new String (input ));
//
// }
Cipher c1 = Cipher.getInstance(Algorithm);
c1.init(Cipher.ENCRYPT_MODE, deskey);
byte[] cipherByte = c1.doFinal(input);
// if (debug ) System.out.println ("加密后的二进串:"+byte2hex (cipherByte ));
return cipherByte;

}

public static byte[] encryptData(byte[] input) throws Exception {
return encryptData(input, DEFAULT_KEY);
}

/**
* 将给定的已加密的数据通过指定的密钥进行解密
*
* @param input
*            待解密的数据
* @param key
*            密钥
* @return byte[] 解密后的数据
* @throws Exception
*/
public static byte[] decryptData(byte[] input, byte[] key) throws Exception {
SecretKey deskey = new javax.crypto.spec.SecretKeySpec(key, Algorithm);
// if (debug ) System.out.println ("解密前的信息:"+byte2hex (input ));
Cipher c1 = Cipher.getInstance(Algorithm);
c1.init(Cipher.DECRYPT_MODE, deskey);
byte[] clearByte = c1.doFinal(input);
// if (debug )
// {
// System.out.println ("解密后的二进串:"+byte2hex (clearByte ));
// System.out.println ("解密后的字符串:"+(new String (clearByte )));
//
// }
return clearByte;

}

public static byte[] decryptData(byte[] input) throws Exception {
return decryptData(input, DEFAULT_KEY);
}

/**
* 字节码转换成16进制字符串
*
* @param byte[] b 输入要转换的字节码
* @return String 返回转换后的16进制字符串
*/
public static String byte2hex(byte[] bytes) {
StringBuilder hs = new StringBuilder();
for(byte b : bytes)
hs.append(String.format("%1$02X", b));
return hs.toString();
}

public static byte[] hex2byte(String content) {
int l=content.length()>>1;
byte[] result=new byte[l];
for(int i=0;i<l;i++) {
int j=i<<1;
String s=content.substring(j, j+2);
result[i]=Integer.valueOf(s, 16).byteValue();
}
return result;
}

/**
* 将字节数组转换为base64编码字符串
* @param buffer
* @return
*/
public static String bytesToBase64(byte[] buffer) {
//BASE64Encoder en=new BASE64Encoder();
return Base64.encode(buffer);
//		return encoder.encode(buffer);
}

/**
* 将base64编码的字符串解码为字节数组
* @param value
* @return
* @throws IOException
*/
public static byte[] base64ToBytes(String value) throws IOException {
//return Base64.decodeToByteArray(value);
//		System.out.println(decoder.decodeBuffer(value));
//		return decoder.decodeBuffer(value);
return Base64.decode(value);
}

/**
* 加密给定的字符串
* @param value
* @return 加密后的base64字符串
*/
public static String encryptString(String value) {
return encryptString(value, DEFAULT_KEY);
}

/**
* 根据给定的密钥加密字符串
* @param value 待加密的字符串
* @param key 以BASE64形式存在的密钥
* @return 加密后的base64字符串
* @throws IOException
*/
public static String encryptString(String value, String key) throws IOException {
return encryptString(value, base64ToBytes(key));
}

/**
* 根据给定的密钥加密字符串
* @param value 待加密的字符串
* @param key 字节数组形式的密钥
* @return 加密后的base64字符串
*/
public static String encryptString(String value, byte[] key) {
try {
byte[] data=value.getBytes(VALUE_ENCODING);
data=CryptUtils.encryptData(data, key);
return bytesToBase64(data);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
return null;
}
}

/**
* 解密字符串
* @param value base64形式存在的密文
* @return 明文
*/
public static String decryptString(String value) {
return decryptString(value, DEFAULT_KEY);
}

/**
* 解密字符串
* @param value base64形式存在的密文
* @param key base64形式存在的密钥
* @return 明文
* @throws IOException
*/
public static String decryptString(String value, String key) throws IOException {
String s=decryptString(value, base64ToBytes(key));
return s;
}

/**
* 解密字符串
* @param value base64形式存在的密文
* @param key 字节数据形式存在的密钥
* @return 明文
*/
public static String decryptString(String value, byte[] key) {
try {
byte[] data=base64ToBytes(value);
data=CryptUtils.decryptData(data, key);
return new String(data, VALUE_ENCODING);
}catch(Exception e) {
e.printStackTrace();
return null;
}
}
}

package com.gdie.lab.crypt;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;

import org.springframework.util.DigestUtils;

public class CryptHelper{

private static String CRYPT_KEY = "zhongqian";

//加密
private static Cipher ecip;
//解密
private static Cipher dcip;

static {
try {
String KEY = DigestUtils.md5DigestAsHex(CRYPT_KEY.getBytes()).toUpperCase();
KEY = KEY.substring(0, 8);
byte[] bytes = KEY.getBytes();
DESKeySpec ks = new DESKeySpec(bytes);
SecretKeyFactory skf = SecretKeyFactory.getInstance("DES");
SecretKey sk = skf.generateSecret(ks);
IvParameterSpec iv2 = new IvParameterSpec(bytes);

ecip = Cipher.getInstance("DES/CBC/PKCS5Padding");
ecip.init(Cipher.ENCRYPT_MODE, sk, iv2);

dcip = Cipher.getInstance("DES/CBC/PKCS5Padding");
dcip.init(Cipher.DECRYPT_MODE, sk, iv2);
}catch(Exception ex) {
ex.printStackTrace();
}
}

public static String encrypt(String content) throws Exception {
byte[] bytes = ecip.doFinal(content.getBytes("ascii"));
return CryptUtils.byte2hex(bytes);
}

public static String decrypt(String content) throws Exception {
byte[] bytes  = CryptUtils.hex2byte(content);
bytes = dcip.doFinal(bytes);
return new String(bytes, "ascii");
}
//test
public static void main(String[] args) throws Exception {
String password = "gly";
String en = encrypt(password);
System.out.println(en);
System.out.println(decrypt(en));

}
}