RSA使用SpongyCastle [英] RSA using SpongyCastle

问题描述

在Android应用程序中，我正在尝试模仿此命令的执行使用 SpongyCastle库和标准的 java.security libs：

  echo'test'| openssl rsautl -encrypt -pubin -inkey test.pub | base64> encrypted_file 
  

应该注意，命令中的/从文件的读/写是不是将被实现，我有我的公钥（即 test.pub ）作为Base64编码字符串 base64key 在我的代码。

我尝试过以下操作，但确定它不起作用：

  static {
 Security.insertProviderAt（new BouncyCastleProvider（），1）; 
} 
 
 //...更多代码这里
 
 byte [] pka = Base64.decode（base64key）; 
 
 X509EncodedKeySpec x = new X509EncodedKeySpec（pka）; 
 PublicKey publicKey = KeyFactory.getInstance（RSA）。generatePublic（x）; 
 
 byte [] testToByte =test.getBytes（UTF8）; 
 
 KeyPairGenerator keyGen = KeyPairGenerator.getInstance（RSA）; 
 keyGen.initialize（2048）; 
 
密码密码= Cipher.getInstance（RSA）; 
 cipher.init（Cipher.ENCRYPT_MODE，publicKey）; 
 
 byte [] cipherText = cipher.doFinal（testToByte）; 
 
 String encrypted = Base64.encode（（new String（cipherText，UTF8）。toString（）。getBytes（）））
  

我知道这是关闭的，但不知道在哪里转。任何帮助将不胜感激。

解决方案

最终使用以下方法解决：

  private void stripHeaders（）{
 
 public_key = public_key.replace（----- BEGIN PUBLIC KEY -----，）; 
 public_key = public_key.replace（----- END PUBLIC KEY -----，）; 
 
} 
 
 public byte [] encryptWithPublicKey（String encrypt）throws异常{
 byte [] message = encrypt.getBytes（UTF-8）; 
 stripHeaders（）; 
 PublicKey apiPublicKey = getRSAPublicKeyFromString（）; 
密码rsaCipher = Cipher.getInstance（RSA /无/ PKCS1Padding，SC）; 
 rsaCipher.init（Cipher.ENCRYPT_MODE，apiPublicKey）; 
 return rsaCipher.doFinal（message）; 
} 
 
 private PublicKey getRSAPublicKeyFromString（）throws Exception {
 KeyFactory keyFactory = KeyFactory.getInstance（RSA，SC）; 
 byte [] publicKeyBytes = Base64.decode（public_key.getBytes（UTF-8），Base64.DEFAULT）; 
 X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec（publicKeyBytes）; 
 return keyFactory.generatePublic（x509KeySpec）; 
} 
  

My knowledge of encryption is very basic, so apologies for any ignorance on my part.

Within an Android app I am currently trying to mimic the execution of this command using the SpongyCastle library and standard java.security libs:

echo 'test' | openssl rsautl -encrypt -pubin -inkey test.pub | base64 > encrypted_file

It should be noted that the reading/writing to and from files in the command are not going to be implemented and I have my public key (i.e. test.pub) as a Base64 encoded string base64key in my code.

I have attempted the following but am certain it does not work:

static {
       Security.insertProviderAt(new BouncyCastleProvider(), 1);
      }

//...more code here

byte[] pka = Base64.decode(base64key);

X509EncodedKeySpec x = new X509EncodedKeySpec(pka);
PublicKey publicKey = KeyFactory.getInstance("RSA").generatePublic(x);

byte[] testToByte = "test".getBytes("UTF8"); 

KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA"); 
keyGen.initialize(2048); 

Cipher cipher = Cipher.getInstance("RSA"); 
cipher.init(Cipher.ENCRYPT_MODE, publicKey); 

byte[] cipherText = cipher.doFinal(testToByte); 

String encrypted = Base64.encode((new String(cipherText, "UTF8").toString().getBytes()))

I know this is way off, but am not sure where to turn. Any help would be appreciated.

解决方案

This was eventually solved using the following methods:

private void stripHeaders(){

    public_key = public_key.replace("-----BEGIN PUBLIC KEY-----", "");
    public_key = public_key.replace("-----END PUBLIC KEY-----", "");

}

public byte[] encryptWithPublicKey(String encrypt) throws Exception {
    byte[] message = encrypt.getBytes("UTF-8");
    stripHeaders(); 
    PublicKey apiPublicKey= getRSAPublicKeyFromString(); 
    Cipher rsaCipher = Cipher.getInstance("RSA/None/PKCS1Padding", "SC");
    rsaCipher.init(Cipher.ENCRYPT_MODE, apiPublicKey); 
    return rsaCipher.doFinal(message);
}

private PublicKey getRSAPublicKeyFromString() throws Exception{
    KeyFactory keyFactory = KeyFactory.getInstance("RSA", "SC"); 
    byte[] publicKeyBytes = Base64.decode(public_key.getBytes("UTF-8"), Base64.DEFAULT); 
    X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(publicKeyBytes); 
    return keyFactory.generatePublic(x509KeySpec);
}

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