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java 加密算法 rsa md5
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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*
返回值：String*
@param src*
@param pubkey*
@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*
返回值：String*
@param sec*
@param privkey*
@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)*
返回值：String 密文*
@param src*
@param key*
@param method(DES、AES、DESede)*
@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)*
生成时间：5月2日 下午1:12:13*
返回值：String 密钥原文*
@param sec*
@param key*
@param method(DES、AES、DESede)*
@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,*
返回值：String 加密后的密文*
@param src传入加密字符串(明文)*
@param method 指定算法(md5、md2、SHA(SHA-1，SHA1)、SHA-256、SHA-384、SHA-512)*
@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！！"); } }}
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