Question

我在Java中面临解密问题。以下是遇到的错误：

javax.crypto.BadPaddingException: Blocktype mismatch: -127
    at sun.security.rsa.RSAPadding.unpadV15(RSAPadding.java:311)
    at sun.security.rsa.RSAPadding.unpad(RSAPadding.java:255)

使用以下代码在.Net中加密文本：

public string EncryptString( string inputString, int dwKeySize, string xmlString )
        {
            RSACryptoServiceProvider rsaCryptoServiceProvider = new RSACryptoServiceProvider( dwKeySize );
            rsaCryptoServiceProvider.FromXmlString( xmlString );
            int keySize = dwKeySize / 8;
            byte[] bytes = Encoding.UTF32.GetBytes( inputString );
            int maxLength = keySize - 42;
            int dataLength = bytes.Length;
            int iterations = dataLength / maxLength;
            StringBuilder stringBuilder = new StringBuilder();
            for( int i = 0; i <= iterations; i++ )
            {
                byte[] tempBytes = new byte[ ( dataLength - maxLength * i > maxLength ) ? maxLength : dataLength - maxLength * i ];
                Buffer.BlockCopy( bytes, maxLength * i, tempBytes, 0, tempBytes.Length );
                byte[] encryptedBytes = rsaCryptoServiceProvider.Encrypt( tempBytes, true );

                Array.Reverse( encryptedBytes );
                stringBuilder.Append( Convert.ToBase64String( encryptedBytes ) );               
            }           
            return stringBuilder.ToString();
        }

解密代码是JAVA：

PrivateKey privKey = readPrivateKey(); // reads the private key 
        Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
        cipher.init(Cipher.DECRYPT_MODE, privKey);
            byte[] encryptedBytes = Base64.decodeBase64(encryptedText.getBytes("UTF-32"));
        encryptedBytes = reverse(b); // reverse the bytes 
        byte[] decrypted = cipher.doFinal(encryptedBytes);
        return new String(decrypted);

我在这里遗漏了什么吗？如何进行双向加密/解密？

Answer 1

当您使用PKSC v1.5时，您的C＃应用程序正在使用OAEP填充PKSC v2尝试将您的C＃代码更改为：

ptedBytes = rsaCryptoServiceProvider.Encrypt( tempBytes, false );

Answer 2

这可能有所帮助：

http://jafetsanchez.com/post/7562162652/rijndael-on-c-and-java

RSA加密/解密问题：来自.Net的加密文本未在Java中解密

2 个答案: