Java Encrypter 加密算法

Java代碼

/**

* 加密者

*

* @time: 2007-8-29 下午05:45:36

*/

public final class Encrypter {

private static Cipher ecipher;

private static Cipher dcipher;

// 必須24個字符

private static final String key = "*:@1$7!a*:@1$7!a*:@1$7!^";

private static final String alg = "DESede";

static {

try {

SecretKey skey = new SecretKeySpec(key.getBytes(), alg);

ecipher = Cipher.getInstance(alg);

dcipher = Cipher.getInstance(alg);

ecipher.init(Cipher.ENCRYPT_MODE, skey);

dcipher.init(Cipher.DECRYPT_MODE, skey);

} catch (Exception e) {

e.printStackTrace();

}

}

/**

* 加密字符串

*

* @param str

* @return

*/

public static String encrypt(String str) {

if (str == null)

return "";

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

return Base64Support.toUrlStr(enc);

} catch (Exception e) {

e.printStackTrace();

return "";

}

}

/**

* 解密字符串

*

* @param str

* @return

*/

public static String decrypt(String str) {

if (str == null)

return "";

try {

// Decode base64 to get bytes

byte[] dec = Base64Support.fromUrlStr(str);

// Decrypt

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

// Decode using utf-8

return new String(utf8, "UTF8");

} catch (Exception e) {

e.printStackTrace();

return "";

}

}

public static void main(String[] args) {

System.out.println(encrypt("google"));

}

}