CODEWITHSUNDEEP
c#rsabouncycastle
Asad Iftikhar
Asad Iftikhar

Reputation: 717

Unable to cast object of type 'Org.BouncyCastle.Crypto.AsymmetricCipherKeyPair' to type 'Org.BouncyCastle.Crypto.Parameters.RsaKeyParameters'

Here is the code which is working fine when reading file from the txt but when i read it from the string i am getting the error here

        public string encrypt(string plainText,string PrivateKey)
        {

            byte[] plainTextBytes = Encoding.UTF8.GetBytes(plainText);
           
            string filepath = path + "\\rsakeys\\pem_public.pem";
            string localPath = new Uri(filepath).LocalPath;
            PemReader pr = new PemReader(
                (StreamReader)File.OpenText(localPath)
            );

            var reader = new StringReader(PrivateKey);
            var pre = new PemReader(reader);
            var o = pr.ReadObject();

            var os = pre.ReadObject();
           
            RsaKeyParameters keys = (RsaKeyParameters)os;   >>> Here i am getting the error where os is the object readed from the string

Upvotes: 4

Views: 9819

Answers (2)

XouDo
XouDo

Reputation: 961

I encountered the same error. The cause was, using the KeyStore Explorer software, I was encrypting the RSA private key in addition to just exporting it.

1

So, basically, the code complains that it's reading an asymmetricly encrypted key pair while expecting an RSA private key.

I unchecked the "Encrypt" box, in the "export private key" dialog box befor exporting the .pem, and the exception disappeared.

Upvotes: 0

Asad Iftikhar
Asad Iftikhar

Reputation: 717

This solve my problem

            var o = pr.ReadObject();
            AsymmetricCipherKeyPair keyPair=(AsymmetricCipherKeyPair)o;

            //As Keypair.public is RsaParamterKey

            Pkcs1Encoding eng = new Pkcs1Encoding(new RsaEngine());
            eng.Init(true, keyPair.Public);

Upvotes: -1

Related Questions