调用的时候: mPassword = DES.encrypt(null, password, "UTF-8");
encrypt方法会返回“加密失败”,报异常java.security.NoSuchProviderException: Provider not available: SunJCE,是为什么呢, 下面是Des的代码
package com.shishi.utils;
import java.security.Key;
import javax.crypto.Cipher;
/**
*
*
*
* @author vlinux
*
*
*/
public class DES {
private static String strDefaultKey = "aaaa";
private Cipher encryptCipher = null;
private Cipher decryptCipher = null;
/**
*
* 将byte数组转换为表示16进制值的字符串, 如:byte[]{8,18}转换为:0813, 和public static byte[]
* hexStr2ByteArr(String strIn) 互为可逆的转换过程
*
* @param arrB
*
* 需要转换的byte数组
*
* @return 转换后的字符串
*
* @throws Exception
*
* 本方法不处理任何异常,所有异常全部抛出
*/
public static String byteArr2HexStr(byte[] arrB) throws Exception {
int iLen = arrB.length;
// 每个byte用两个字符才能表示,所以字符串的长度是数组长度的两倍
StringBuffer sb = new StringBuffer(iLen * 2);
for (int i = 0; i < iLen; i++) {
int intTmp = arrB[i];
// 把负数转换为正数
while (intTmp < 0) {
intTmp = intTmp + 256;
}
// 小于0F的数需要在前面补0
if (intTmp < 16) {
sb.append("0");
}
sb.append(Integer.toString(intTmp, 16));
}
return sb.toString();
}
/**
*
* 将表示16进制值的字符串转换为byte数组, 和public static String byteArr2HexStr(byte[] arrB)
* 互为可逆的转换过程
*
* @param strIn
*
* 需要转换的字符串
*
* @return 转换后的byte数组
*
* @throws Exception
*
* 本方法不处理任何异常,所有异常全部抛出 @ <a
* href="mailto:leo841001@163.com">LiGuoQing</a>
*/
public static byte[] hexStr2ByteArr(String strIn) throws Exception {
byte[] arrB = strIn.getBytes();
int iLen = arrB.length;
// 两个字符表示一个字节,所以字节数组长度是字符串长度除以2
byte[] arrOut = new byte[iLen / 2];
for (int i = 0; i < iLen; i = i + 2) {
String strTmp = new String(arrB, i, 2);
arrOut[i / 2] = (byte) Integer.parseInt(strTmp, 16);
}
return arrOut;
}
/**
*
* 默认构造方法,使用默认密钥
*
* @throws Exception
*/
public DES() throws Exception {
this(strDefaultKey);
}
/**
*
* 指定密钥构造方法
*
* @param strKey
*
* 指定的密钥
*
* @throws Exception
*/
public DES(String strKey) throws Exception {
// 如果没有指定秘钥的话,使用默认秘钥
if (strKey == null || strKey.equals(""))
strKey = strDefaultKey;
Key key = getKey(strKey.getBytes());
// NoPadding
// PKCS5Padding
encryptCipher = Cipher.getInstance("DES/ECB/NoPadding", "SunJCE");
encryptCipher.init(Cipher.ENCRYPT_MODE, key);
decryptCipher = Cipher.getInstance("DES/ECB/NoPadding", "SunJCE");
decryptCipher.init(Cipher.DECRYPT_MODE, key);
}
/**
*
* 加密字节数组
*
* @param arrB
* 需加密的字节数组
*
* @return 加密后的字节数组
*
* @throws Exception
*/
public byte[] encrypt(byte[] arrB) throws Exception {
return encryptCipher.doFinal(arrB);
}
/**
*
* 加密字符串
*
*
*
* @param strIn
*
* 需加密的字符串
*
* @return 加
*
* 密后的字符串
*
* @throws Exception
*/
public String encrypt(String strIn, String encode) throws Exception {
return byteArr2HexStr(encrypt(strIn.getBytes(encode)));
}
/**
*
* 解密字节数组
*
* @param arrB
*
* 需解密的字节数组
*
* @return 解密后的字节数组
*
* @throws Exception
*/
public byte[] decrypt(byte[] arrB) throws Exception {
return decryptCipher.doFinal(arrB);
}
/**
*
* 解密字符串
*
*
*
* @param strIn
*
* 需解密的字符串
*
* @return 解密后的字符串
*
* @throws Exception
*/
public String decrypt(String strIn, String encode) throws Exception {
return new String(decrypt(hexStr2ByteArr(strIn)), encode);
}
/**
*
* 从指定字符串生成密钥,密钥所需的字节数组长度为8位 不足8位时后面补0,超出8位只取前8位
*
*
*
* @param arrBTmp
*
* 构成该字符串的字节数组
*
* @return 生成的密钥
*
* @throws Exception
*/
private Key getKey(byte[] arrBTmp) throws Exception {
// 创建一个空的8位字节数组(默认值为0)
byte[] arrB = new byte[8];
// 将原始字节数组转换为8位
for (int i = 0; i < arrBTmp.length && i < arrB.length; i++) {
arrB[i] = arrBTmp[i];
}
// 生成密钥
Key key = new javax.crypto.spec.SecretKeySpec(arrB, "DES");
return key;
}
/**
*
* DES加密
*
* @param key
* 使用的秘钥,传入null或是空值时使用默认秘钥
*
* @param str
* 待加密的明文
*
* @param encode
* 明文编码方式,一般为“GBK”
*
* @return
*/
public static String encrypt(String key, String str, String encode) {
try {
byte[] strBytes = str.getBytes(encode);
byte[] newStrBytes = new byte[strBytes.length + (8 - strBytes.length % 8)];
for (int i = 0; i < newStrBytes.length; i++) {
newStrBytes[i] = i < strBytes.length ? strBytes[i] : 32;
}// for
return new DES(key).encrypt(new String(newStrBytes, encode), encode);
} catch (Exception e) {
// throw new MPayException(MPayException.MPAY_DES_ERROR,"加密失败",e);
return "加密失败";
}// try
}
/**
*
* DES解密
*
* @param key
* 使用的秘钥,传入null或是空值时使用默认秘钥
*
* @param str
* 待解密的密文
*
* @param encode
* 密文编码方式,一般为“GBK”
*
* @return
*/
public static String decrypt(String key, String str, String encode) {
try {
return new DES(key).decrypt(str, encode).replaceAll("\\s*$", "");
} catch (Exception e) {
// throw new MPayException(MPayException.MPAY_DES_ERROR,"解密失败",e);
return "解密失败";
}// try
}
public static void main(String[] args) throws Exception {
// String str = DesUtil.encrypt("}7$#3@+1~/B\\[D&...","intf", "UTF-8");
// System.out.println("密文=" + str);
// System.out.println("明文=#" +
// DesUtil.decrypt("}7$#3@+1~/B\\[D&...",str, "UTF-8")+"#");
// System.out.println(DesUtil.decrypt("}7$#3@+1~/B\\[D&...","54c5b564c51868ba",
// "UTF-8"));//f54c505c18c74894 54c5b564c51868ba
//
// System.out.println( DesUtil.decrypt("}7$#3@+1", "d40d315388d74f2d",
// "GBK") );
String key = "";
String message = "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";
System.out.println(DES.decrypt(key, message, "GBK"));
String str = "123456.com";
System.out.println(DES.encrypt(key, str, "GBK"));
}
}