RSA加密编码使用Apache编解码器问题

Question

1）我有我写了一个解密方法

运行解密方法，而我得到了下面一个txt文件

2）私钥采用Android解密上述例外。

import java.io.File; 
import java.io.FileInputStream; 
import java.security.KeyFactory; 
import java.security.PrivateKey; 
import java.security.spec.EncodedKeySpec; 
import java.security.spec.PKCS8EncodedKeySpec; 
import java.util.Calendar; 
import java.util.Random; 

import javax.crypto.Cipher; 

import android.util.Base64; 
public static String decrypt(String inputString, byte[] keyBytes) { 
    String resultStr = null; 
    Calendar cal = Calendar.getInstance(); 
    int mDay = cal.get(Calendar.DAY_OF_MONTH); 
    Random generator = new Random(mDay); 
    int num = (generator.nextInt()) % 100; 
    String salt = "XXwerr" + num; 
    PrivateKey privateKey = null; 
    try { 
     KeyFactory keyFactory = KeyFactory.getInstance("RSA"); 
     EncodedKeySpec privateKeySpec = new PKCS8EncodedKeySpec(keyBytes); 
     privateKey = keyFactory.generatePrivate(privateKeySpec); 
    } catch (Exception e) { 
     System.out.println("Exception privateKey::::::::::::::::: " 
       + e.getMessage()); 
    } 
    byte[] decodedBytes = null; 
    try { 
     Cipher c = Cipher.getInstance("RSA"); 
     //Also tried 
     // Cipher c = Cipher.getInstance("RSA/ECB/PKCS1Padding"); 
     c.init(Cipher.DECRYPT_MODE, privateKey); 
     decodedBytes = c.doFinal(Base64.decode(inputString, Base64.NO_CLOSE)); 

    } catch (Exception e) { 
     System.out.println("Exception privateKey1::::::::::::::::: " 
       + e.getMessage()); 
     e.printStackTrace(); 
    } 
    if (decodedBytes != null) { 
     resultStr = new String(decodedBytes); 
     System.out.println("resultStr:::" + resultStr + ":::::"); 
     resultStr = resultStr.replace(salt, ""); 
    } 
    return resultStr; 

} 

下面是主要方法

public static void main(String[] args) { 
    FileInputStream fileInputStream = null; 

    File file = new File("/Users/buta1/Downloads/private.txt"); 

    byte[] bFile = new byte[(int) file.length()]; 

    try { 
     // convert file into array of bytes 
     fileInputStream = new FileInputStream(file); 
     fileInputStream.read(bFile); 
     fileInputStream.close(); 

     // for (int i = 0; i < bFile.length; i++) { 
     // System.out.println((char)bFile[i]); 
     // } 
     decrypt("08F8CFE58F2E707C314F4D7894E0F1", bFile); 
     System.out.println("Done"); 
    } catch (Exception e) { 
     e.printStackTrace(); 
    } 
} 

所使用的加密方法如下使用Android的Base64类

public static String encrypt(String inputString, byte [] keyBytes) 
    { 
    Calendar cal = Calendar.getInstance(); 
    int mDay = cal.get(Calendar.DAY_OF_MONTH); 
    //System.out.println("Day of month :::" + mDay); 
    String encryptedString = ""; 
    Key publicKey = null; 
    try { 
    Random generator = new Random(mDay); 
    int num = (generator.nextInt()) % 100; 
    String salt = "xx"+num; 
    inputString += salt; 
    X509EncodedKeySpec publicKeySpec = new X509EncodedKeySpec(keyBytes); 
    KeyFactory keyFactory = KeyFactory.getInstance("RSA"); 
    publicKey = keyFactory.generatePublic(publicKeySpec); 
    } catch (Exception e) { 
    System.out.println("Exception rsaEncrypt::::::::::::::::: "+ 
    e.getMessage()); 
    } 
    // Encode the original data with RSA public key 
    byte[] encodedBytes = null; 
    try { 
    Cipher c = Cipher.getInstance("RSA"); 
    c.init(Cipher.ENCRYPT_MODE, publicKey); 
    encodedBytes = c.doFinal(inputString.getBytes()); 
    encryptedString = 
    Base64.encodeToString(encodedBytes, Base64.NO_CLOSE); 
    } catch (Exception e) { 
    System.out.println("Exception rsaEncrypt::::::::::::::::: "+ 
    e.getMessage()); 
    } 

    return encryptedString; 
    } 

使用公编解码基础后64

Cipher c = Cipher.getInstance("RSA/ECB/PKCS1Padding "); 

得到以下错误

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:365) 
    at com.sun.crypto.provider.RSACipher.engineDoFinal(RSACipher.java:391) 
    at javax.crypto.Cipher.doFinal(Cipher.java:2087) 
    at RSAEncryption.decrypt(RSAEncryption.java:41) 
    at RSAEncryption.main(RSAEncryption.java:108) 

Answer 1

我假设你想在你的类路径中运行从IDE内部的Android代码与android.jar（例如通过在eclipse中使用ADT插件）。然后，这看起来像“按预期工作”（参见https://code.google.com/p/android/issues/detail?id=33188）。

android.jar只包含所有类的存根实现，因为预期的方法是在模拟器中运行该代码。

如果您正在尝试编写Android代码，并且发现在模拟器中运行代码太麻烦，您可以尝试Roboelectric，它基本上用真正的实现取代所有这些存根，并允许您从内部运行代码你骑。

在另一方面，如果你不试图编写代码的Android，你可以简单地用org.apache.commons.codec.binary.Base64或java.util.Base64.Decoder（从Java 8）取代android.util.Base64。