import java.io.UnsupportedEncodingException; import java.security.InvalidKeyException; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import java.security.PrivateKey; import java.security.PublicKey; import java.security.SecureRandom; import javax.crypto.BadPaddingException; import javax.crypto.Cipher; import javax.crypto.IllegalBlockSizeException; import javax.crypto.KeyGenerator; import javax.crypto.NoSuchPaddingException; import javax.crypto.SecretKey; import com.sun.mail.util.BASE64DecoderStream; import com.sun.mail.util.BASE64EncoderStream; public class util {     /**      * 传入名文和公钥钥对数据进行RSA解密      * <br>返回值：String      * <br>@param src      * <br>@param pubkey      * <br>@return      */     public static String rsaEncoding(String src,PublicKey pubkey){         try {             Cipher cip = Cipher.getInstance("RSA");             cip.init(cip.ENCRYPT_MODE, pubkey);             byte[] by = cip.doFinal(src.getBytes());             return new String(BASE64EncoderStream.encode(by));         } catch (NoSuchAlgorithmException e) {             throw new RuntimeException(e);         } catch (NoSuchPaddingException e) {             throw new RuntimeException(e);         } catch (InvalidKeyException e) {             throw new RuntimeException(e);         } catch (IllegalBlockSizeException e) {             throw new RuntimeException(e);         } catch (BadPaddingException e) {             throw new RuntimeException(e);         }     }     /**      * 传入RSA密文和私钥对数据进行解密      * <br>返回值：String      * <br>@param sec      * <br>@param privkey      * <br>@return      */     public static String rsaDeEncoding(String sec,PrivateKey privkey){         try {             Cipher cip = Cipher.getInstance("RSA");             cip.init(cip.DECRYPT_MODE, privkey);             byte[] by = BASE64DecoderStream.decode(sec.getBytes());             return new String(cip.doFinal(by));         } catch (NoSuchAlgorithmException e) {             throw new RuntimeException(e);         } catch (NoSuchPaddingException e) {             throw new RuntimeException(e);         } catch (InvalidKeyException e) {             throw new RuntimeException(e);         } catch (IllegalBlockSizeException e) {             throw new RuntimeException(e);         } catch (BadPaddingException e) {             throw new RuntimeException(e);         }     }     /**      * 传入字符串、密钥，并加密字符串（对称加密加密），支持：DES、AES、DESede(3DES)      * <br>返回值：String 密文      * <br>@param src      * <br>@param key      * <br>@param method(DES、AES、DESede)      * <br>@return      */     //对称加密加密     public static String doubKeyEncoding(String src,String keysrc,String method) {         SecretKey key;         try {             //生成密钥             KeyGenerator kg =  KeyGenerator.getInstance(method);             //初始化此密钥生成器。             kg.init(new SecureRandom(keysrc.getBytes("utf-8")));             key = kg.generateKey();             //加密             Cipher ciph =  Cipher.getInstance(method);             ciph.init(Cipher.ENCRYPT_MODE, key);             ciph.update(src.getBytes("utf-8"));             //使用64进行编码，一避免出现丢数据情景             byte[] by = BASE64EncoderStream.encode(ciph.doFinal());             return new String(by);         } catch (NoSuchAlgorithmException e) {             throw new RuntimeException(e);         } catch (NoSuchPaddingException e) {             throw new RuntimeException(e);         } catch (InvalidKeyException e) {             throw new RuntimeException(e);         } catch (IllegalBlockSizeException e) {             throw new RuntimeException(e);         } catch (BadPaddingException e) {             throw new RuntimeException(e);         } catch (UnsupportedEncodingException e) {             throw new RuntimeException(e);         }     }     /**      * 传入字符串、密钥、加密方式，并解密字符串（对称加密解密密），支持：DES、AES、DESede(3DES)      * <br>生成时间：2014年5月2日  下午1:12:13      * <br>返回值：String 密钥原文      * <br>@param sec      * <br>@param key      * <br>@param method(DES、AES、DESede)      * <br>@return      */     public static String doubKeyDencoding(String sec,String keysrc,String method) {         SecretKey key;         try {             //生成密钥             KeyGenerator kg =  KeyGenerator.getInstance(method);             //初始化此密钥生成器。             kg.init(new SecureRandom(keysrc.getBytes("utf-8")));             key = kg.generateKey();             //加密             Cipher ciph =  Cipher.getInstance(method);             ciph.init(ciph.DECRYPT_MODE, key);             //使用64进行解码，一避免出现丢数据情景             byte[] by = BASE64DecoderStream.decode(sec.getBytes());             ciph.update(by);             return new String(ciph.doFinal());         } catch (NoSuchAlgorithmException e) {             throw new RuntimeException(e);         } catch (NoSuchPaddingException e) {             throw new RuntimeException(e);         } catch (InvalidKeyException e) {             throw new RuntimeException(e);         } catch (IllegalBlockSizeException e) {             throw new RuntimeException(e);         } catch (BadPaddingException e) {             throw new RuntimeException(e);         } catch (UnsupportedEncodingException e) {             throw new RuntimeException(e);         }     }     /**      * 单向信息加密(信息摘要)，支持：md5、md2、SHA(SHA-1，SHA1)、SHA-256、SHA-384、SHA-512,      * <br>返回值：String         加密后的密文      * <br>@param src     传入加密字符串(明文)      * <br>@param method  指定算法(md5、md2、SHA(SHA-1，SHA1)、SHA-256、SHA-384、SHA-512)      * <br>@return      */     public static String ecodingPasswd(String src,String method){         try {             //信息摘要算法             MessageDigest md5 = MessageDigest.getInstance(method);             md5.update(src.getBytes());             byte[] encoding = md5.digest();             //使用64进行编码，一避免出现丢数据情景             return new String(BASE64EncoderStream.encode(encoding));         } catch (NoSuchAlgorithmException e) {             throw new RuntimeException(e+"加密失败！！");         }     } }