PwdUtil.java 密碼加密

quasiceo 2014-09-12

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分類： java 工具 2013-05-10 13:54 139人閱讀評論(0) 收藏舉報

[java] view plain copy

import java.security.MessageDigest;
public class PwdUtil {
public static String MD5(String inStr) {
MessageDigest md5 = null;
try {
md5 = MessageDigest.getInstance("MD5");
} catch (Exception e) {
System.out.println(e.toString());
e.printStackTrace();
return "";
}
char[] charArray = inStr.toCharArray();
byte[] byteArray = new byte[charArray.length];
for (int i = 0; i < charArray.length; ++i) {
byteArray[i] = (byte) charArray[i];
}
byte[] md5Bytes = md5.digest(byteArray);
StringBuffer hexValue = new StringBuffer();
for (int i = 0; i < md5Bytes.length; ++i) {
int val = md5Bytes[i] & 0xFF;
if (val < 16)
hexValue.append("0");
hexValue.append(Integer.toHexString(val));
}
return hexValue.toString();
}
public static String encrypt(String inStr) {
char[] a = inStr.toCharArray();
for (int i = 0; i < a.length; ++i) {
a[i] = (char) (a[i] ^ 0x74);
}
String s = new String(a);
return s;
}
public static String decrypt(String inStr) {
char[] a = inStr.toCharArray();
for (int i = 0; i < a.length; ++i) {
a[i] = (char) (a[i] ^ 0x74);
}
String k = new String(a);
return k;
}
}

另一個加密工具

[java] view plain copy

import java.security.Key;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;
public class PasswordUtil {
/**
* JAVA6支持以下任意一種算法 PBEWITHMD5ANDDES PBEWITHMD5ANDTRIPLEDES
* PBEWITHSHAANDDESEDE PBEWITHSHA1ANDRC2_40 PBKDF2WITHHMACSHA1
* */
/**
* 定義使用的算法為:PBEWITHMD5andDES算法
*/
public static final String ALGORITHM = "PBEWithMD5AndDES";//加密算法
public static final String Salt = "63293188";//密鑰
/**
* 定義迭代次數為1000次
*/
private static final int ITERATIONCOUNT = 1000;
/**
* 獲取加密算法中使用的鹽值,解密中使用的鹽值必須與加密中使用的相同才能完成操作. 鹽長度必須為8字節(jié)
*
* @return byte[] 鹽值
* */
public static byte[] getSalt() throws Exception {
// 實例化安全隨機數
SecureRandom random = new SecureRandom();
// 產出鹽
return random.generateSeed(8);
}
public static byte[] getStaticSalt() {
// 產出鹽
return Salt.getBytes();
}
/**
* 根據PBE密碼生成一把密鑰
*
* @param password
* 生成密鑰時所使用的密碼
* @return Key PBE算法密鑰
* */
private static Key getPBEKey(String password) {
// 實例化使用的算法
SecretKeyFactory keyFactory;
SecretKey secretKey = null;
try {
keyFactory = SecretKeyFactory.getInstance(ALGORITHM);
// 設置PBE密鑰參數
PBEKeySpec keySpec = new PBEKeySpec(password.toCharArray());
// 生成密鑰
secretKey = keyFactory.generateSecret(keySpec);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return secretKey;
}
/**
* 加密明文字符串
*
* @param plaintext
* 待加密的明文字符串
* @param password
* 生成密鑰時所使用的密碼
* @param salt
* 鹽值
* @return 加密后的密文字符串
* @throws Exception
*/
public static String encrypt(String plaintext, String password, byte[] salt) {
Key key = getPBEKey(password);
byte[] encipheredData = null;
PBEParameterSpec parameterSpec = new PBEParameterSpec(salt, ITERATIONCOUNT);
try {
Cipher cipher = Cipher.getInstance(ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, key, parameterSpec);
encipheredData = cipher.doFinal(plaintext.getBytes());
} catch (Exception e) {
}
return bytesToHexString(encipheredData);
}
/**
* 解密密文字符串
*
* @param ciphertext
* 待解密的密文字符串
* @param password
* 生成密鑰時所使用的密碼(如需解密,該參數需要與加密時使用的一致)
* @param salt
* 鹽值(如需解密,該參數需要與加密時使用的一致)
* @return 解密后的明文字符串
* @throws Exception
*/
public static String decrypt(String ciphertext, String password, byte[] salt) {
Key key = getPBEKey(password);
byte[] passDec = null;
PBEParameterSpec parameterSpec = new PBEParameterSpec(getStaticSalt(), ITERATIONCOUNT);
try {
Cipher cipher = Cipher.getInstance(ALGORITHM);
cipher.init(Cipher.DECRYPT_MODE, key, parameterSpec);
passDec = cipher.doFinal(hexStringToBytes(ciphertext));
}
catch (Exception e) {
// TODO: handle exception
}
return new String(passDec);
}
/**
* 將字節(jié)數組轉換為十六進制字符串
*
* @param src
* 字節(jié)數組
* @return
*/
public static String bytesToHexString(byte[] src) {
StringBuilder stringBuilder = new StringBuilder("");
if (src == null || src.length <= 0) {
return null;
}
for (int i = 0; i < src.length; i++) {
int v = src[i] & 0xFF;
String hv = Integer.toHexString(v);
if (hv.length() < 2) {
stringBuilder.append(0);
}
stringBuilder.append(hv);
}
return stringBuilder.toString();
}
/**
* 將十六進制字符串轉換為字節(jié)數組
*
* @param hexString
* 十六進制字符串
* @return
*/
public static byte[] hexStringToBytes(String hexString) {
if (hexString == null || hexString.equals("")) {
return null;
}
hexString = hexString.toUpperCase();
int length = hexString.length() / 2;
char[] hexChars = hexString.toCharArray();
byte[] d = new byte[length];
for (int i = 0; i < length; i++) {
int pos = i * 2;
d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));
}
return d;
}
private static byte charToByte(char c) {
return (byte) "0123456789ABCDEF".indexOf(c);
}
public static void main(String[] args) {
int i=10;
for (int j = 0; j < i; j++) {
if((j)%3==0)
{
System.out.print("<br>");
}
else {
System.out.print(j);
}
}
System.out.print(-1%2==0);
String str = "admin";
String password = "123456";
System.out.println("明文:" + str);
System.out.println("密碼:" + password);
try {
byte[] salt = PasswordUtil.getStaticSalt();
String ciphertext = PasswordUtil.encrypt(str, password, salt);
System.out.println("密文:" + ciphertext);
String plaintext = PasswordUtil.decrypt(ciphertext, password, salt);
System.out.println("明文:" + plaintext);
} catch (Exception e) {
e.printStackTrace();
}
}
}