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(转)Java DES 与Base64
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原文地址http://blog.csdn.net/tomatozq/article/details/20773559
1，DES
/**
* 解密
* @param message
* @param key
* @return
* @throws Exception
*/
public static String decrypt(String message,String encoding) throws Exception { byte[] bytesrc = convertHexString(message);
Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
DESKeySpec desKeySpec = new DESKeySpec(key.getBytes(encoding));
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
IvParameterSpec iv = new IvParameterSpec(key.getBytes(encoding)); cipher.init(Cipher.DECRYPT_MODE, secretKey, iv); byte[] retByte = cipher.doFinal(bytesrc);
return new String(retByte,encoding);
} /**
* 加密
* @param message
* @param key
* @return
* @throws Exception
*/
public static String encrypt(String message,String encoding) throws Exception {
Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding"); DESKeySpec desKeySpec = new DESKeySpec(key.getBytes(encoding)); SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
IvParameterSpec iv = new IvParameterSpec(key.getBytes(encoding));
cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv); byte[] buf = cipher.doFinal(message.getBytes(encoding)); String a = toHexString(buf).toUpperCase(); return a;
} /**
* 字符串转换为16进制数组
* @param ss
* @return
*/
public static byte[] convertHexString(String ss) {
byte digest[] = new byte[ss.length() / 2];
for (int i = 0; i < digest.length; i++) {
String byteString = ss.substring(2 * i, 2 * i + 2);
int byteValue = Integer.parseInt(byteString, 16);
digest[i] = (byte) byteValue;
} return digest;
} /**
* 16进制数组转换为字符串
* @param b
* @return
*/
public static String toHexString(byte b[]) {
StringBuffer hexString = new StringBuffer();
for (int i = 0; i < b.length; i++) {
String plainText = Integer.toHexString(0xff & b[i]);
if (plainText.length() < 2)
plainText = "0" + plainText;
hexString.append(plainText);
} return hexString.toString();
}
2，Base64
byte[] enc = Base64.encode(encText.getBytes(encoding), Base64.DEFAULT);
byte[] bytesrc = Base64.decode(encText.getBytes(encoding), Base64.DEFAULT);
