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Asked: 2026-05-18T01:50:37+00:00

I’m using C# to generate an RSA public/private key to encrypt user information. I

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I’m using C# to generate an RSA public/private key to encrypt user information. I need to make the public key and exponent available thought for other systems and languages. They will be signing the data and the C# web service will decrypt it and act upon it.

Right now, I have


RSA rsa = new RSACryptoServiceProvider(2048); // Generate a new 2048 bit RSA key
RSAParameters par = rsa.ExportParameters(false);

But the results for par.Exponent and par.Modulo are byte arrays. How can I convert the exponent to a string that can be parsed in another language. The samples in other languages I’ve seen seem to b

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1 Answer

  1. Editorial Team

    You could use a plain hex string or Base64 encoding – both are well-established methods of transporting binary data as a string:

    byte[] byteArray = new byte[] { 1, 2, 3, 253, 254, 255 };

// hexString will be "010203FDFEFF"
string hexString = string.Concat(byteArray.Select(b => b.ToString("X2")));

// b64String will be "AQID/f7/"
string b64String = Convert.ToBase64String(byteArray);

    (Note that if you’re not using .NET4 then you’ll need to pass an array to the Concat method rather than an IEnumerable<T>. You can do this easily enough by bolting a ToArray call onto the Select.)

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