package util; import java.io.*; import java.security.*; import javax.crypto.*; import javax.crypto.spec.SecretKeySpec; public class CryptTool { public CryptTool() { } public static javax.crypto.SecretKey genDESKey(byte[] key_byte) throws Exception { // javax.crypto.spec.DESKeySpec deskeyspec = new javax.crypto.spec.DESKeySpec( // key_byte); // javax.crypto.SecretKeyFactory skf = javax.crypto.SecretKeyFactory. // getInstance("DES", "SunJCE"); // return (javax.crypto.SecretKey) skf.generateSecret(deskeyspec); //KeyGenerator kg = KeyGenerator.getInstance("DESede"); SecretKey k = null; k = new SecretKeySpec(key_byte,"DESede"); return k; } public static byte[] desDecrypt(javax.crypto.SecretKey key, byte[] crypt) throws Exception { javax.crypto.Cipher cipher = javax.crypto.Cipher.getInstance( "DESede"); cipher.init(javax.crypto.Cipher.DECRYPT_MODE, key); return cipher.doFinal(crypt); } public static String desDecrypt(javax.crypto.SecretKey key, String crypt) throws Exception { return new String(desDecrypt(key, crypt.getBytes())); } public static byte[] desEncrypt(javax.crypto.SecretKey key, byte[] src) throws Exception { javax.crypto.Cipher cipher = javax.crypto.Cipher.getInstance( "DESede"); cipher.init(javax.crypto.Cipher.ENCRYPT_MODE, key); return cipher.doFinal(src); } public static String desEncrypt(javax.crypto.SecretKey key, String src) throws Exception { return new String(desEncrypt(key, src.getBytes())); } public static byte[] md5Digest(byte[] src) throws Exception { java.security.MessageDigest alg = java.security.MessageDigest.getInstance( "MD5"); // MD5 is 16 bit message digest return alg.digest(src); } public static String md5Digest(String src) throws Exception { return new String(md5Digest(src.getBytes())); } public static String base64Encode(String src) { sun.misc.BASE64Encoder encoder = new sun.misc.BASE64Encoder(); return encoder.encode(src.getBytes()); } public static String base64Encode(byte[] src) { sun.misc.BASE64Encoder encoder = new sun.misc.BASE64Encoder(); return encoder.encode(src); } public static String base64Decode(String src) { sun.misc.BASE64Decoder decoder = new sun.misc.BASE64Decoder(); try { return new String(decoder.decodeBuffer(src)); } catch (Exception ex) { return null; } } public static byte[] base64DecodeToBytes(String src) { sun.misc.BASE64Decoder decoder = new sun.misc.BASE64Decoder(); try { return decoder.decodeBuffer(src); } catch (Exception ex) { return null; } } public static String urlEncode(String src) { try { src = java.net.URLEncoder.encode(src, "GB2312"); return src; } catch (Exception ex) { ex.printStackTrace(); } return src; } public String urlDecode(String value) { try { return java.net.URLDecoder.decode(value, "GB2312"); } catch (Exception ex) { ex.printStackTrace(); } return value; } public static void main(String[] args) { byte src_byte[] = "1234567812345678".getBytes(); System.out.println(src_byte.length); byte key_byte[] = "123456781234567812345678".getBytes();// 3DES 24 bytes key try { // 生成DES密钥 javax.crypto.SecretKey deskey; //生成DES密钥 // javax.crypto.KeyGenerator key = javax.crypto.KeyGenerator.getInstance( // "DES"); // key.init(56); // deskey = key.generateKey(); deskey = genDESKey(key_byte); System.out.println("Generator DES KEY OK"); // DES加解密 byte[] encrypt, decrypt; //加密 encrypt = desEncrypt(deskey, src_byte); System.out.println("encrypt=" + new String(encrypt)); //解密 decrypt = desDecrypt(deskey, encrypt); System.out.println("decrypt=" + new String(decrypt)); // String s = "12345678"; // //加密 // s = desEncrypt(deskey, s); // System.out.println("encrypt=" + s); // //解密 // s = desDecrypt(deskey, s); // System.out.println("decrypt=" + s); } catch (Exception ex) { ex.printStackTrace(); } System.out.println("BASE64 Test:" + base64Decode(base64Encode("1234"))); } } |