C++

Create PKCS1 RSA Signature with PEM Private Key

See more RSA Examples

Demonstrates how to load a private key from a PEM file and create a PKCS1 RSA digital signature. C++

#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";
    }