jsp加密解密问题.rar

package Lion.Security.Cryptography; import javax.crypto.Cipher; import javax.crypto.KeyGenerator; import javax.crypto.NoSuchPaddingException; import javax.crypto.SecretKey; import java.security.NoSuchAlgorithmException; import java.security.Security; public class des { private String Algorithm = "DES"; private KeyGenerator keygen; private SecretKey deskey; private Cipher c; private byte[] cipherByte; public des() { init(); } public void init() { Security.addProvider(new com.sun.crypto.provider.SunJCE()); try { keygen = KeyGenerator.getInstance(Algorithm); deskey = keygen.generateKey(); c = Cipher.getInstance(Algorithm); } catch(NoSuchAlgorithmException ex){ ex.printStackTrace(); } catch(NoSuchPaddingException ex){ ex.printStackTrace(); } } public byte[] createEncryptor(String str) { try { c.init(Cipher.ENCRYPT_MODE, deskey); cipherByte = c.doFinal(str.getBytes()); } catch(java.security.InvalidKeyException ex){ ex.printStackTrace(); } catch(javax.crypto.BadPaddingException ex){ ex.printStackTrace(); } catch(javax.crypto.IllegalBlockSizeException ex){ ex.printStackTrace(); return cipherByte; } return cipherByte; } public String createDecryptor(byte[] buff) { try { c.init(Cipher.DECRYPT_MODE, deskey); cipherByte = c.doFinal(buff); } catch(java.security.InvalidKeyException ex){ ex.printStackTrace(); } catch(javax.crypto.BadPaddingException ex){ ex.printStackTrace(); } catch(javax.crypto.IllegalBlockSizeException ex){ ex.printStackTrace(); } return (new String(cipherByte)); } }