Java DES加密解密
import java.security.SecureRandom; import javax.crypto.Cipher; import javax.crypto.SecretKey; import javax.crypto.SecretKeyFactory; import javax.crypto.spec.DESKeySpec; public class CryptKit { private final static String DES = "DES"; public static void main(String args[]) throws Exception { String str = encrypt("The cold night", "12345678"); System.out.println(str); String str2 = decrypt("63B121C4EA212F8BC74E8113BDFBFB81", "12345678"); System.out.println(str2); } // 加密 public static byte[] encrypt(byte[] data, byte[] key) throws Exception { Cipher cipher = Cipher.getInstance(DES); DESKeySpec ds = new DESKeySpec(key); SecureRandom sr = new SecureRandom(); SecretKeyFactory skfactory = SecretKeyFactory.getInstance(DES); SecretKey skey = skfactory.generateSecret(ds); cipher.init(Cipher.ENCRYPT_MODE, skey, sr); byte[] b = cipher.doFinal(data); return b; } // 加密 public static String encrypt(String data, String key) throws Exception { return byte2hex(encrypt(data.getBytes(), key.getBytes())); } // 解密 public static byte[] decrypt(byte[] data, byte[] key) throws Exception { Cipher cipher = Cipher.getInstance(DES); DESKeySpec ds = new DESKeySpec(key); SecureRandom sr = new SecureRandom(); SecretKeyFactory skfactory = SecretKeyFactory.getInstance(DES); SecretKey skey = skfactory.generateSecret(ds); cipher.init(Cipher.DECRYPT_MODE, skey, sr); return cipher.doFinal(data); } // 解密 public static String decrypt(String data, String key) throws Exception { return new String(decrypt(hex2byte(data.getBytes()), key.getBytes())); } private static String byte2hex(byte[] b) { StringBuilder hs = new StringBuilder(); String stmp; for (int n = 0; b != null && n < b.length; n++) { stmp = Integer.toHexString(b[n] & 0XFF); if (stmp.length() == 1) hs.append(‘0‘); hs.append(stmp); } return hs.toString().toUpperCase(); } private static byte[] hex2byte(byte[] b) { if ((b.length % 2) != 0) throw new IllegalArgumentException(); byte[] b2 = new byte[b.length / 2]; for (int n = 0; n < b.length; n += 2) { String item = new String(b, n, 2); b2[n / 2] = (byte) Integer.parseInt(item, 16); } return b2; }}
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