C++

RSA Signature using Private Key from .snk File

See more RSA Examples

A .snk file (Strong Name Key file) is a file format used in the .NET ecosystem to store an RSA public/private key pair. This key pair is typically used for strong-naming assemblies, which is a process of signing .NET assemblies to ensure their integrity and to uniquely identify them.

This example loads a private key from a .snk file and creates an RSA signature.

C++

#include <CkRsa.h>
#include <CkPrivateKey.h>

void ChilkatSample(void)
    {
    bool success = false;

    CkRsa rsa;

    //  Load the .snk and return the private key as XML.
    const char *xmlStr = rsa.snkToXml("./test.snk");
    if (rsa.get_LastMethodSuccess() == false) {
        std::cout << rsa.lastErrorText() << "\r\n";
        return;
    }

    CkPrivateKey privKey;
    success = privKey.LoadXml(xmlStr);
    if (success == false) {
        std::cout << privKey.lastErrorText() << "\r\n";
        return;
    }

    success = rsa.UsePrivateKey(privKey);
    if (success == false) {
        std::cout << rsa.lastErrorText() << "\r\n";
        return;
    }

    //  Sign the SHA-256 hash of the utf-8 byte representation of the contents of sb
    //  Return the signature in base64 format.
    rsa.put_EncodingMode("base64");
    rsa.put_Charset("utf-8");
    const char *sigBase64 = rsa.signStringENC("This is the text to be hashed and signed.","sha256");
    if (rsa.get_LastMethodSuccess() == false) {
        std::cout << rsa.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "RSA signature as base64: " << sigBase64 << "\r\n";
    }