Bouncy Castle pem Reader 在读取公钥时抛出异常

Question

I am trying to encrypt a message in C# (in Unity) using a public key. To do this I am using the Bouncy Castle library. I get an error when trying to read the public key using the bouncy castle pem reader. I took this code from here . The specific error I get is:

ArgumentException: illegal object in GetInstance: Org.BouncyCastle.Asn1.Dersequence

Here is the code:

     static string encrypt(string plainText) {
        byte[] plainTextBytes = Encoding.UTF8.GetBytes(plainText);

        PemReader pr = new PemReader(
            new StringReader(m_publicKey)
        );
        RsaKeyParameters keys = (RsaKeyParameters)pr.ReadObject();

        OaepEncoding eng = new OaepEncoding(new RsaEngine());
        eng.Init(true, keys);

        int length = plainTextBytes.Length;
        int blockSize = eng.GetInputBlockSize();
        List<byte> cipherTextBytes = new List<byte>();
        for (int chunkPosition = 0;
            chunkPosition < length;
            chunkPosition += blockSize)
        {
            int chunkSize = Math.Min(blockSize, length - chunkPosition);
            cipherTextBytes.AddRange(eng.ProcessBlock(
                plainTextBytes, chunkPosition, chunkSize
            ));
        }
        return Convert.ToBase64String(cipherTextBytes.ToArray());
    }

The error occurs when instantiating the pem reader. there is a slight difference in my code and the example code linked (I use a StringReader rather than reading from a file), but I get the same error if I read from a file. Does anyone have any ideas?

Answer 1

Ok, I hope this helps anyone else who makes this silly mistake. My public key was of the format:

-----END RSA PUBLIC KEY-----
...
-----END RSA PUBLIC KEY-----

Apparently this format is not accepted.

after removing the "RSA" from the header and footer, it was able to load the public key.

EDIT: If helpful for anyone, The key was generated by a go's crypto/rsa package. (GenerateKey function)