Create PKCS1 RSA Signature with PEM Private Key

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

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

void ChilkatSample(void)
    {
    CkPrivateKey pkey;

    //  Load the private key from an RSA PEM file:
    pkey.LoadPemFile("pvkey2_rsa.pem");

    bool success;

    CkString pkeyXml;
    //  Get the private key in XML format:
    pkeyXml = pkey.getXml();

    CkRsa rsa;

    //  Any string argument automatically begins the 30-day trial.

    success = rsa.UnlockComponent("30-day trial");
    if (success != true) {
        printf("RSA component unlock failed\n");
        return;
    }

    //  Import the private key into the RSA component:
    success = rsa.ImportPrivateKey(pkeyXml);
    if (success != true) {
        printf("%s\n",rsa.lastErrorText());
        return;
    }

    //  This example will sign a string, and receive the signature
    //  in a hex-encoded string.  Therefore, set the encoding mode
    //  to "hex":
    rsa.put_EncodingMode("hex");

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

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

    printf("%s\n",(const char *)hexSig);

    printf("Success!\n");
    }