java加密算法分享(rsa解密、对称加密、md5加密)
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2022-05-18 08:21:10
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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 * <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!!"); } } }
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