java rsa 解密報:javax.crypto.BadPaddingException: Decryption error

時間 2019-11-21

標籤 java rsa 密報 javax.crypto.badpaddingexception javax crypto badpaddingexception decryption error 欄目 Java 简体版

原文原文鏈接

Exception in thread "main" javax.crypto.BadPaddingException: Decryption error
   at sun.security.rsa.RSAPadding.unpadV15(RSAPadding.java:380)
   at sun.security.rsa.RSAPadding.unpad(RSAPadding.java:291)
   at com.sun.crypto.provider.RSACipher.doFinal(RSACipher.java:356)
   at com.sun.crypto.provider.RSACipher.engineDoFinal(RSACipher.java:389)
   at javax.crypto.Cipher.doFinal(Cipher.java:2223)
   at com.asymmetric.rsa.TestRSA.testDecrypt(TestRSA.java:115)

at com.asymmetric.rsa.TestRSA.main(TestRSA.java:34)html

簡單解釋:java

字面意思就是解密的時候填充錯誤,rsa 加解密都是把數據必須知足必定的長度,若是不知足就要進行填充(通常是補0)直到知足特定的長度api

測試代碼數組

  
  
  
  
   
 
    
     
      
     
     
      
      package com.asymmetric.rsa; 
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
      
      import java.io.ByteArrayOutputStream; 
      
     
 
    
     
      
     
     
      
      import java.io.IOException; 
      
     
 
    
     
      
     
     
      
      import java.security.InvalidKeyException; 
      
     
 
    
     
      
     
     
      
      import java.security.KeyFactory; 
      
     
 
    
     
      
     
     
      
      import java.security.NoSuchAlgorithmException; 
      
     
 
    
     
      
     
     
      
      import java.security.PrivateKey; 
      
     
 
    
     
      
     
     
      
      import java.security.PublicKey; 
      
     
 
    
     
      
     
     
      
      import java.security.spec.InvalidKeySpecException; 
      
     
 
    
     
      
     
     
      
      import java.security.spec.PKCS8EncodedKeySpec; 
      
     
 
    
     
      
     
     
      
      import java.security.spec.X509EncodedKeySpec; 
      
     
 
    
     
      
     
     
      
      import java.util.Base64; 
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
      
      import javax.crypto.BadPaddingException; 
      
     
 
    
     
      
     
     
      
      import javax.crypto.Cipher; 
      
     
 
    
     
      
     
     
      
      import javax.crypto.IllegalBlockSizeException; 
      
     
 
    
     
      
     
     
      
      import javax.crypto.NoSuchPaddingException; 
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
      
      public 
      class TestRSA { 
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
      
      public 
      static String publicKey = 
      "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDQgEoj3z9JrdPNI23DbMQkl3gkGuDke7iBr5yrYyqolkTyxuBLWFwHNuGv4VKOj9fXg61QxpaJ/fxDBvMvmkBSRowHBloGFceVTx8wV/8u0DcjvTCu0IZ1zp6wjG6xBn5j66Sg/q+9hvaY2p7fkKmsvcW6VoNPgQHU1Cf01DLZmQIDAQAB+oXcINOiE3AsuZ4VJmwNZg9Y/7fY+OFRS2JAh5YMsrv2qyoGP+Z9ksre26NYR+Lt91B2lhdwJHLpQpziaANZm/ONb31fj/lwIDAQAB"; 
      
     
 
    
     
      
     
     
      
      public 
      static String privateKey = 
      "MIICdgIBADANBgkqhkiG9w0BAQEFAASCAmAwggJcAgEAAoGBANCASiPfP0mt080jbcNsxCSXeCQa4OR7uIGvnKtjKqiWRPLG4EtYXAc24a/hUo6P19eDrVDGlon9/EMG8y+aQFJGjAcGWgYVx5VPHzBX/y7QNyO9MK7QhnXOnrCMbrEGfmPrpKD+r72G9pjant+Qqay9xbpWg0+BAdTUJ/TUMtmZAgMBAAECgYBSozY/Z4FW+31h5fPgK+DFu/8TGFAgXuTvCaJnz2Md9IkZTDejxT6cYWUr53toI5zhvz/XLw6FXNQ54KxMJq/s9PiZYUgq/PMrnyU4gBSTm5BmiWjdaGicVEZ1lofHjpkAchPNW/CzwxD8AeKI7QaObE+EkWbLAi6sa+nRdHKgrQJBAOwYLD2DncU15XCKS0RNzTrNohdBQcisOPHdtQO0CGZlxx3xjuU4WL6/EpdmbjTeYbOSDKCmY5vyVbYZdOWfEs8CQQDiFIwWpvW2WLxLVw3i2P55WmMMXuecwEzg++ae3Ht7nW0zNcWSsyvHh40sM8XqEzmWOzMY6JOePbkuVfWTc4cXAkBRzf5mQhiEoKwjVofF3v9hhKbJT/8vPR1uENgLtHHEqTdZFL3ihqeZUDNs6jz9bKCFy/E8KOsSueEg+6kZdwjZAkEAj2RW4fstd2VasDJb5ViaNqAEmJENOBej60L6KCJR07qqy0M8t+oaR2iLOtDvo6Jj8QxFQXQqRMCDVodAxjANKwJAL3KuaqA6kdy9RxdV3uP8nRXLY7C/1ZIK6U0pyZqKXEwpD+7Ar3hwwhPz9TeuoqjB/cCknZjw70BQFQ0/VUHW2g=="; 
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
      
      private 
      static String algorithm = 
      "RSA"; 
      //$NON-NLS-1$ 
      
     
 
    
     
      
     
     
      
      private 
      static 
      final 
      int MAX_ENCRYPT_BLOCK = 
      117; 
      
     
 
    
     
      
     
     
      
      private 
      static 
      final 
      int MAX_DECRYPT_BLOCK = 
      128; 
      
     
 
    
     
      
     
     
      
      private 
      static String data = 
      "test jiojiogeiojigouihgtest jiojiogeiojigouihgtest jiojiogeiojigouihgtest jiojiogeiojigouihgtest jiojiogeiojigouihgtest jiojiogeiojigouihgtest jiojiogeiojigouihgtest jiojiogeiojigouihgtest jiojiogeiojigouihgtest jiojiogeiojigouihgtest jiojiogeiojigouihgtest jiojiogeiojigouihgtest jiojiogeiojigouihgtest jiojiogeiojigouihgtest jiojiogeiojigouihgtest jiojiogeiojigouihgtest jiojiogeiojigouihg"; 
      //$NON-NLS-1$ 
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
      
      public static void main(String[] args) throws NoSuchAlgorithmException, InvalidKeySpecException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException, InvalidKeyException, IOException { 
      
     
 
    
     
      
     
     
     
       String test = testEncrypt(privateKey,data); 
      
     
 
    
     
      
     
     
     
       String testDecrypt = testDecrypt(publicKey, test); 
      
     
 
    
     
      
     
     
     
       System.out.println(testDecrypt); 
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
     
       } 
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
      
      /** 
      
     
 
    
     
      
     
     
      
       * 加密 
      
     
 
    
     
      
     
     
      
       * @param key 
      
     
 
    
     
      
     
     
      
       * @param data 
      
     
 
    
     
      
     
     
      
       * @return 
      
     
 
    
     
      
     
     
      
       * @throws NoSuchAlgorithmException 
      
     
 
    
     
      
     
     
      
       * @throws InvalidKeySpecException 
      
     
 
    
     
      
     
     
      
       * @throws NoSuchPaddingException 
      
     
 
    
     
      
     
     
      
       * @throws IllegalBlockSizeException 
      
     
 
    
     
      
     
     
      
       * @throws BadPaddingException 
      
     
 
    
     
      
     
     
      
       * @throws InvalidKeyException 
      
     
 
    
     
      
     
     
      
       * @throws IOException  
      
     
 
    
     
      
     
     
      
       */ 
      
     
 
    
     
      
     
     
      
      public static String testEncrypt(String key,String data) throws NoSuchAlgorithmException, InvalidKeySpecException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException, InvalidKeyException, IOException{ 
      
     
 
    
     
      
     
     
      
      byte[] decode = Base64.getDecoder().decode(key); 
      
     
 
    
     
      
     
     
     
       PKCS8EncodedKeySpec pkcs8EncodedKeySpec = 
      new PKCS8EncodedKeySpec(decode); 
      
     
 
    
     
      
     
     
     
       KeyFactory kf = KeyFactory.getInstance(algorithm); 
      
     
 
    
     
      
     
     
     
       PrivateKey generatePrivate = kf.generatePrivate(pkcs8EncodedKeySpec); 
      
     
 
    
     
      
     
     
     
       Cipher ci = Cipher.getInstance(algorithm); 
      
     
 
    
     
      
     
     
     
       ci.init(Cipher.ENCRYPT_MODE, generatePrivate); 
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
      
      byte[] bytes = data.getBytes(); 
      
     
 
    
     
      
     
     
      
      int inputLen = bytes.length; 
      
     
 
    
     
      
     
     
      
      int offLen = 
      0; 
      //偏移量 
      
     
 
    
     
      
     
     
      
      int i = 
      0; 
      
     
 
    
     
      
     
     
     
       ByteArrayOutputStream bops = 
      new ByteArrayOutputStream(); 
      
     
 
    
     
      
     
     
      
      while(inputLen - offLen > 
      0){ 
      
     
 
    
     
      
     
     
      
      byte [] cache; 
      
     
 
    
     
      
     
     
      
      if(inputLen - offLen > 
      117){ 
      
     
 
    
     
      
     
     
     
       cache = ci.doFinal(bytes, offLen, 
      117); 
      
     
 
    
     
      
     
     
     
       } 
      else{ 
      
     
 
    
     
      
     
     
     
       cache = ci.doFinal(bytes, offLen,inputLen - offLen); 
      
     
 
    
     
      
     
     
     
       } 
      
     
 
    
     
      
     
     
     
       bops.write(cache); 
      
     
 
    
     
      
     
     
     
       i++; 
      
     
 
    
     
      
     
     
     
       offLen = 
      117 * i; 
      
     
 
    
     
      
     
     
     
       } 
      
     
 
    
     
      
     
     
     
       bops.close(); 
      
     
 
    
     
      
     
     
      
      byte[] encryptedData = bops.toByteArray(); 
      
     
 
    
     
      
     
     
     
       String encodeToString = Base64.getEncoder().encodeToString(encryptedData); 
      
     
 
    
     
      
     
     
      
      return encodeToString; 
      
     
 
    
     
      
     
     
     
       } 
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
      
      /** 
      
     
 
    
     
      
     
     
      
       * 解密 
      
     
 
    
     
      
     
     
      
       * @param key 
      
     
 
    
     
      
     
     
      
       * @param data 
      
     
 
    
     
      
     
     
      
       * @return 
      
     
 
    
     
      
     
     
      
       * @throws NoSuchAlgorithmException 
      
     
 
    
     
      
     
     
      
       * @throws InvalidKeyException  
      
     
 
    
     
      
     
     
      
       * @throws NoSuchPaddingException  
      
     
 
    
     
      
     
     
      
       * @throws InvalidKeySpecException  
      
     
 
    
     
      
     
     
      
       * @throws BadPaddingException  
      
     
 
    
     
      
     
     
      
       * @throws IllegalBlockSizeException  
      
     
 
    
     
      
     
     
      
       * @throws IOException  
      
     
 
    
     
      
     
     
      
       */ 
      
     
 
    
     
      
     
     
      
      public static String testDecrypt(String key,String data) throws NoSuchAlgorithmException, InvalidKeyException, NoSuchPaddingException, InvalidKeySpecException, IllegalBlockSizeException, BadPaddingException, IOException{ 
      
     
 
    
     
      
     
     
      
      byte[] decode = Base64.getDecoder().decode(key); 
      
     
 
    
     
      
     
     
      
      // PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(decode); //java底層 RSA公鑰只支持X509EncodedKeySpec這種格式 
      
     
 
    
     
      
     
     
     
       X509EncodedKeySpec x509EncodedKeySpec = 
      new X509EncodedKeySpec(decode); 
      
     
 
    
     
      
     
     
     
       KeyFactory kf = KeyFactory.getInstance(algorithm); 
      
     
 
    
     
      
     
     
     
       PublicKey generatePublic = kf.generatePublic(x509EncodedKeySpec); 
      
     
 
    
     
      
     
     
     
       Cipher ci = Cipher.getInstance(algorithm); 
      
     
 
    
     
      
     
     
     
       ci.init(Cipher.DECRYPT_MODE,generatePublic); 
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
      
      int inputLen = data.getBytes().length; 
      
     
 
    
     
      
     
     
      
      byte[] bytes = data.getBytes(); 
      
     
 
    
     
      
     
     
      
      int offLen = 
      0; 
      
     
 
    
     
      
     
     
      
      int i = 
      0; 
      
     
 
    
     
      
     
     
     
       ByteArrayOutputStream byteArrayOutputStream = 
      new ByteArrayOutputStream(); 
      
     
 
    
     
      
     
     
      
      while(inputLen - offLen > 
      0){ 
      
     
 
    
     
      
     
     
      
      byte[] cache; 
      
     
 
    
     
      
     
     
      
      if(inputLen - offLen > 
      128){ 
      
     
 
    
     
      
     
     
     
       cache = ci.doFinal(bytes,offLen, 
      128); 
      
     
 
    
     
      
     
     
     
       } 
      else{ 
      
     
 
    
     
      
     
     
     
       cache = ci.doFinal(bytes,offLen,inputLen - offLen); 
      
     
 
    
     
      
     
     
     
       } 
      
     
 
    
     
      
     
     
     
       byteArrayOutputStream.write(cache); 
      
     
 
    
     
      
     
     
     
       i++; 
      
     
 
    
     
      
     
     
     
       offLen = 
      128 * i; 
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
     
       } 
      
     
 
    
     
      
     
     
     
       byteArrayOutputStream.close(); 
      
     
 
    
     
      
     
     
      
      byte[] byteArray = byteArrayOutputStream.toByteArray(); 
      
     
 
    
     
      
     
     
      
      return 
      new String(byteArray); 
      
     
 
    
     
      
     
     
     
       } 
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
     
       }

問題點:ide

後來發現確實是我本身的錯誤,rsa 加密後返回的字符串使用Base64編碼的,忘了解密直接getBytes()就出錯了測試

api 指出:BadPaddingException - 若是此 Cipher 爲解密模式，而且未請求填充（或不填充），但解密的數據沒有用適當的填充字節進行限制ui

只要是cipher.doFinal()解密時報 BadPaddingException 確定是傳入的字節數組有問題,傳的不是加密時生成的數組
編碼

修正後的代碼:加密

  
  
  
   
 
    
     
      
     
     
      
      package com.asymmetric.rsa; 
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
      
      import java.io.ByteArrayOutputStream; 
      
     
 
    
     
      
     
     
      
      import java.io.IOException; 
      
     
 
    
     
      
     
     
      
      import java.security.InvalidKeyException; 
      
     
 
    
     
      
     
     
      
      import java.security.KeyFactory; 
      
     
 
    
     
      
     
     
      
      import java.security.NoSuchAlgorithmException; 
      
     
 
    
     
      
     
     
      
      import java.security.PrivateKey; 
      
     
 
    
     
      
     
     
      
      import java.security.PublicKey; 
      
     
 
    
     
      
     
     
      
      import java.security.spec.InvalidKeySpecException; 
      
     
 
    
     
      
     
     
      
      import java.security.spec.PKCS8EncodedKeySpec; 
      
     
 
    
     
      
     
     
      
      import java.security.spec.X509EncodedKeySpec; 
      
     
 
    
     
      
     
     
      
      import java.util.Base64; 
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
      
      import javax.crypto.BadPaddingException; 
      
     
 
    
     
      
     
     
      
      import javax.crypto.Cipher; 
      
     
 
    
     
      
     
     
      
      import javax.crypto.IllegalBlockSizeException; 
      
     
 
    
     
      
     
     
      
      import javax.crypto.NoSuchPaddingException; 
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
      
      public 
      class TestRSA { 
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
      
      public 
      static String publicKey = 
      "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDQgEoj3z9JrdPNI23DbMQkl3gkGuDke7iBr5yrYyqolkTyxuBLWFwHNuGv4VKOj9fXg61QxpaJ/fxDBvMvmkBSRowHBloGFceVTx8wV/8u0DcjvTCu0IZ1zp6wjG6xBn5j66Sg/q+9hvaY2p7fkKmsvcW6VoNPgQHU1Cf01DLZmQIDAQAB+oXcINOiE3AsuZ4VJmwNZg9Y/7fY+OFRS2JAh5YMsrv2qyoGP+Z9ksre26NYR+Lt91B2lhdwJHLpQpziaANZm/ONb31fj/lwIDAQAB"; 
      
     
 
    
     
      
     
     
      
      public 
      static String privateKey = 
      "MIICdgIBADANBgkqhkiG9w0BAQEFAASCAmAwggJcAgEAAoGBANCASiPfP0mt080jbcNsxCSXeCQa4OR7uIGvnKtjKqiWRPLG4EtYXAc24a/hUo6P19eDrVDGlon9/EMG8y+aQFJGjAcGWgYVx5VPHzBX/y7QNyO9MK7QhnXOnrCMbrEGfmPrpKD+r72G9pjant+Qqay9xbpWg0+BAdTUJ/TUMtmZAgMBAAECgYBSozY/Z4FW+31h5fPgK+DFu/8TGFAgXuTvCaJnz2Md9IkZTDejxT6cYWUr53toI5zhvz/XLw6FXNQ54KxMJq/s9PiZYUgq/PMrnyU4gBSTm5BmiWjdaGicVEZ1lofHjpkAchPNW/CzwxD8AeKI7QaObE+EkWbLAi6sa+nRdHKgrQJBAOwYLD2DncU15XCKS0RNzTrNohdBQcisOPHdtQO0CGZlxx3xjuU4WL6/EpdmbjTeYbOSDKCmY5vyVbYZdOWfEs8CQQDiFIwWpvW2WLxLVw3i2P55WmMMXuecwEzg++ae3Ht7nW0zNcWSsyvHh40sM8XqEzmWOzMY6JOePbkuVfWTc4cXAkBRzf5mQhiEoKwjVofF3v9hhKbJT/8vPR1uENgLtHHEqTdZFL3ihqeZUDNs6jz9bKCFy/E8KOsSueEg+6kZdwjZAkEAj2RW4fstd2VasDJb5ViaNqAEmJENOBej60L6KCJR07qqy0M8t+oaR2iLOtDvo6Jj8QxFQXQqRMCDVodAxjANKwJAL3KuaqA6kdy9RxdV3uP8nRXLY7C/1ZIK6U0pyZqKXEwpD+7Ar3hwwhPz9TeuoqjB/cCknZjw70BQFQ0/VUHW2g=="; 
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
      
      private 
      static String algorithm = 
      "RSA"; 
      //$NON-NLS-1$ 
      
     
 
    
     
      
     
     
      
      private 
      static 
      final 
      int MAX_ENCRYPT_BLOCK = 
      117; 
      
     
 
    
     
      
     
     
      
      private 
      static 
      final 
      int MAX_DECRYPT_BLOCK = 
      128; 
      
     
 
    
     
      
     
     
      
      private 
      static String data = 
      "test jiojiogeiojigouihgtest jiojiogeiojigouihgtest jiojiogeiojigouihgtest jiojiogeiojigouihgtest jiojiogeiojigouihgtest jiojiogeiojigouihgtest jiojiogeiojigouihgtest jiojiogeiojigouihgtest jiojiogeiojigouihgtest jiojiogeiojigouihgtest jiojiogeiojigouihgtest jiojiogeiojigouihgtest jiojiogeiojigouihgtest jiojiogeiojigouihgtest jiojiogeiojigouihgtest jiojiogeiojigouihgtest jiojiogeiojigouihg"; 
      //$NON-NLS-1$ 
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
      
      public static void main(String[] args) throws NoSuchAlgorithmException, InvalidKeySpecException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException, InvalidKeyException, IOException { 
      
     
 
    
     
      
     
     
     
       String test = testEncrypt(privateKey,data); 
      
     
 
    
     
      
     
     
     
       String testDecrypt = testDecrypt(publicKey, test); 
      
     
 
    
     
      
     
     
     
       System.out.println(testDecrypt); 
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
     
       } 
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
      
      /** 
      
     
 
    
     
      
     
     
      
       * 加密 
      
     
 
    
     
      
     
     
      
       * @param key 
      
     
 
    
     
      
     
     
      
       * @param data 
      
     
 
    
     
      
     
     
      
       * @return 
      
     
 
    
     
      
     
     
      
       * @throws NoSuchAlgorithmException 
      
     
 
    
     
      
     
     
      
       * @throws InvalidKeySpecException 
      
     
 
    
     
      
     
     
      
       * @throws NoSuchPaddingException 
      
     
 
    
     
      
     
     
      
       * @throws IllegalBlockSizeException 
      
     
 
    
     
      
     
     
      
       * @throws BadPaddingException 
      
     
 
    
     
      
     
     
      
       * @throws InvalidKeyException 
      
     
 
    
     
      
     
     
      
       * @throws IOException  
      
     
 
    
     
      
     
     
      
       */ 
      
     
 
    
     
      
     
     
      
      public static String testEncrypt(String key,String data) throws NoSuchAlgorithmException, InvalidKeySpecException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException, InvalidKeyException, IOException{ 
      
     
 
    
     
      
     
     
      
      byte[] decode = Base64.getDecoder().decode(key); 
      
     
 
    
     
      
     
     
     
       PKCS8EncodedKeySpec pkcs8EncodedKeySpec = 
      new PKCS8EncodedKeySpec(decode); 
      
     
 
    
     
      
     
     
     
       KeyFactory kf = KeyFactory.getInstance(algorithm); 
      
     
 
    
     
      
     
     
     
       PrivateKey generatePrivate = kf.generatePrivate(pkcs8EncodedKeySpec); 
      
     
 
    
     
      
     
     
     
       Cipher ci = Cipher.getInstance(algorithm); 
      
     
 
    
     
      
     
     
     
       ci.init(Cipher.ENCRYPT_MODE, generatePrivate); 
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
      
      byte[] bytes = data.getBytes(); 
      
     
 
    
     
      
     
     
      
      int inputLen = bytes.length; 
      
     
 
    
     
      
     
     
      
      int offLen = 
      0; 
      //偏移量 
      
     
 
    
     
      
     
     
      
      int i = 
      0; 
      
     
 
    
     
      
     
     
     
       ByteArrayOutputStream bops = 
      new ByteArrayOutputStream(); 
      
     
 
    
     
      
     
     
      
      while(inputLen - offLen > 
      0){ 
      
     
 
    
     
      
     
     
      
      byte [] cache; 
      
     
 
    
     
      
     
     
      
      if(inputLen - offLen > 
      117){ 
      
     
 
    
     
      
     
     
     
       cache = ci.doFinal(bytes, offLen, 
      117); 
      
     
 
    
     
      
     
     
     
       } 
      else{ 
      
     
 
    
     
      
     
     
     
       cache = ci.doFinal(bytes, offLen,inputLen - offLen); 
      
     
 
    
     
      
     
     
     
       } 
      
     
 
    
     
      
     
     
     
       bops.write(cache); 
      
     
 
    
     
      
     
     
     
       i++; 
      
     
 
    
     
      
     
     
     
       offLen = 
      117 * i; 
      
     
 
    
     
      
     
     
     
       } 
      
     
 
    
     
      
     
     
     
       bops.close(); 
      
     
 
    
     
      
     
     
      
      byte[] encryptedData = bops.toByteArray(); 
      
     
 
    
     
      
     
     
     
       String encodeToString = Base64.getEncoder().encodeToString(encryptedData); 
      
     
 
    
     
      
     
     
      
      return encodeToString; 
      
     
 
    
     
      
     
     
     
       } 
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
      
      /** 
      
     
 
    
     
      
     
     
      
       * 解密 
      
     
 
    
     
      
     
     
      
       * @param key 
      
     
 
    
     
      
     
     
      
       * @param data 
      
     
 
    
     
      
     
     
      
       * @return 
      
     
 
    
     
      
     
     
      
       * @throws NoSuchAlgorithmException 
      
     
 
    
     
      
     
     
      
       * @throws InvalidKeyException  
      
     
 
    
     
      
     
     
      
       * @throws NoSuchPaddingException  
      
     
 
    
     
      
     
     
      
       * @throws InvalidKeySpecException  
      
     
 
    
     
      
     
     
      
       * @throws BadPaddingException  
      
     
 
    
     
      
     
     
      
       * @throws IllegalBlockSizeException  
      
     
 
    
     
      
     
     
      
       * @throws IOException  
      
     
 
    
     
      
     
     
      
       */ 
      
     
 
    
     
      
     
     
      
      public static String testDecrypt(String key,String data) throws NoSuchAlgorithmException, InvalidKeyException, NoSuchPaddingException, InvalidKeySpecException, IllegalBlockSizeException, BadPaddingException, IOException{ 
      
     
 
    
     
      
     
     
      
      byte[] decode = Base64.getDecoder().decode(key); 
      
     
 
    
     
      
     
     
      
      // PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(decode); //java底層 RSA公鑰只支持X509EncodedKeySpec這種格式 
      
     
 
    
     
      
     
     
     
       X509EncodedKeySpec x509EncodedKeySpec = 
      new X509EncodedKeySpec(decode); 
      
     
 
    
     
      
     
     
     
       KeyFactory kf = KeyFactory.getInstance(algorithm); 
      
     
 
    
     
      
     
     
     
       PublicKey generatePublic = kf.generatePublic(x509EncodedKeySpec); 
      
     
 
    
     
      
     
     
     
       Cipher ci = Cipher.getInstance(algorithm); 
      
     
 
    
     
      
     
     
     
       ci.init(Cipher.DECRYPT_MODE,generatePublic); 
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
      
      byte[] bytes = Base64.getDecoder().decode(data); 
      
     
 
    
     
      
     
     
      
      int inputLen = bytes.length; 
      
     
 
    
     
      
     
     
      
      int offLen = 
      0; 
      
     
 
    
     
      
     
     
      
      int i = 
      0; 
      
     
 
    
     
      
     
     
     
       ByteArrayOutputStream byteArrayOutputStream = 
      new ByteArrayOutputStream(); 
      
     
 
    
     
      
     
     
      
      while(inputLen - offLen > 
      0){ 
      
     
 
    
     
      
     
     
      
      byte[] cache; 
      
     
 
    
     
      
     
     
      
      if(inputLen - offLen > 
      128){ 
      
     
 
    
     
      
     
     
     
       cache = ci.doFinal(bytes,offLen, 
      128); 
      
     
 
    
     
      
     
     
     
       } 
      else{ 
      
     
 
    
     
      
     
     
     
       cache = ci.doFinal(bytes,offLen,inputLen - offLen); 
      
     
 
    
     
      
     
     
     
       } 
      
     
 
    
     
      
     
     
     
       byteArrayOutputStream.write(cache); 
      
     
 
    
     
      
     
     
     
       i++; 
      
     
 
    
     
      
     
     
     
       offLen = 
      128 * i; 
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
     
       } 
      
     
 
    
     
      
     
     
     
       byteArrayOutputStream.close(); 
      
     
 
    
     
      
     
     
      
      byte[] byteArray = byteArrayOutputStream.toByteArray(); 
      
     
 
    
     
      
     
     
      
      return 
      new String(byteArray); 
      
     
 
    
     
      
     
     
     
       } 
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
      
      
     
 
    
     
      
     
     
     
       }