(C# UWP/WinRT) RSA Sign Using Private Key from .pfx/.p12 to Base64 Signature

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Demonstrates how to RSA sign something using a private key loaded from a .pfx/.p12. The RSA signature is returned in Base64 encoded format.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

Chilkat.Rsa rsa = new Chilkat.Rsa();

// Load the .pfx/.p12
Chilkat.Pfx pfx = new Chilkat.Pfx();
bool success = pfx.LoadPfxFile("qa_data/pfx/myKey.p12","myPassword");
if (success != true) {
    Debug.WriteLine(pfx.LastErrorText);
    return;
}

// Get the default private key.
Chilkat.PrivateKey privKey = pfx.GetPrivateKey(0);
if (pfx.LastMethodSuccess != true) {
    Debug.WriteLine(pfx.LastErrorText);
    return;
}

// Import the private key into the RSA component:
success = rsa.ImportPrivateKeyObj(privKey);
if (success != true) {
    Debug.WriteLine(rsa.LastErrorText);

    return;
}

// Get the signature in base64
rsa.EncodingMode = "base64";

string strData = "This is the string to be signed.";

// Sign the string using the sha256 hash algorithm.
// Other valid choices are "sha384", "sha512", "sha-1", "md2" and "md5".
string base64Sig = rsa.SignStringENC(strData,"sha256");

Debug.WriteLine(base64Sig);

Debug.WriteLine("Success!");