(C++) Create PKCS1 RSA Signature with PEM Private Key

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Note: This example requires Chilkat v11.0.0 or greater.

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

void ChilkatSample(void)
    {
    bool success = false;

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

    CkPrivateKey pkey;

    // Load the private key from an RSA PEM file:
    success = pkey.LoadPemFile("pvkey2_rsa.pem");
    if (success == false) {
        std::cout << pkey.lastErrorText() << "\r\n";
        return;
    }

    CkRsa rsa;

    // Import the private key into the RSA object:
    success = rsa.UsePrivateKey(pkey);
    if (success == false) {
        std::cout << rsa.lastErrorText() << "\r\n";
        return;
    }

    // Get the signature as hex.
    rsa.put_EncodingMode("hex");

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

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

    std::cout << hexSig << "\r\n";

    std::cout << "Success!" << "\r\n";
    }