URL中訪問路徑用戶名參數加密解密方法

URL中訪問路徑用戶名參數加密解密方法

public class DesEncrypter {
	Cipher ecipher;
	Cipher dcipher;
	static Logger logger = Logger.getLogger("DesEncrypter");
	// 8-byte Salt
	byte[] salt = { (byte) 0xA9, (byte) 0x9B, (byte) 0xC8, (byte) 0x32,
			(byte) 0x56, (byte) 0x35, (byte) 0xE3, (byte) 0x03 };

	final static private String PASS_PHRASE = "password";

	// Iteration count
	int iterationCount = 19;

	public DesEncrypter() {
		this(PASS_PHRASE);
	}

	public DesEncrypter(String passPhrase) {
		try {
			// Create the key
			KeySpec keySpec = new PBEKeySpec(passPhrase.toCharArray(), salt,
					iterationCount);
			SecretKey key = SecretKeyFactory.getInstance("PBEWithMD5AndDES")
					.generateSecret(keySpec);
			ecipher = Cipher.getInstance(key.getAlgorithm());
			dcipher = Cipher.getInstance(key.getAlgorithm());

			// Prepare the parameter to the ciphers
			AlgorithmParameterSpec paramSpec = new PBEParameterSpec(salt,
					iterationCount);

			// Create the ciphers
			ecipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);
			dcipher.init(Cipher.DECRYPT_MODE, key, paramSpec);
		} catch (java.security.InvalidAlgorithmParameterException e) {
		} catch (java.security.spec.InvalidKeySpecException e) {
		} catch (javax.crypto.NoSuchPaddingException e) {
		} catch (java.security.NoSuchAlgorithmException e) {
		} catch (java.security.InvalidKeyException e) {
		}
	}

	public String encrypt(String str) {
		try {
			// Encode the string into bytes using utf-8
			byte[] utf8 = str.getBytes("UTF8");

			// Encrypt
			byte[] enc = ecipher.doFinal(utf8);

			// Encode bytes to base64 to get a string
			String base64 = new sun.misc.BASE64Encoder().encode(enc);

			return URLEncoder.encode(base64, "ascii");
		} catch (javax.crypto.BadPaddingException e) {
		} catch (IllegalBlockSizeException e) {
		} catch (UnsupportedEncodingException e) {
		}
		return null;
	}

	public String decrypt(String str) {
		try {
			String base64 = URLDecoder.decode(str, "ascii");

			// Decode base64 to get bytes
			byte[] dec = new sun.misc.BASE64Decoder().decodeBuffer(base64);

			// Decrypt
			byte[] utf8 = dcipher.doFinal(dec);

			// Decode using utf-8
			return new String(utf8, "UTF8");
		} catch (javax.crypto.BadPaddingException e) {
		} catch (IllegalBlockSizeException e) {
		} catch (UnsupportedEncodingException e) {
		} catch (IOException e) {
		}

		return null;
	}

需要URLEncoder.encode加密兩次，才能正常解密獲取