(C++) secp256k1 Key Generation and Keccak-256

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

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#include <CkPrng.h>
#include <CkEcc.h>
#include <CkPrivateKey.h>
#include <CkStringBuilder.h>
#include <CkBinData.h>

void ChilkatSample(void)
    {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // Create a Fortuna PRNG and seed it with system entropy.
    // This will be our source of random data for generating the ECDSA private key.
    CkPrng fortuna;
    const char *entropy = fortuna.getEntropy(32,"base64");
    bool success = fortuna.AddEntropy(entropy,"base64");

    CkEcc ecc;

    // Generate a random ECDSA private key on the secp256k1 curve.
    CkPrivateKey *privKey = ecc.GenEccKey("secp256k1",fortuna);
    if (ecc.get_LastMethodSuccess() != true) {
        std::cout << ecc.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "Successfully generated a sec256k1 key." << "\r\n";

    delete privKey;

    // Show how to compute the Keccak-256 hash in a few ways.
    CkStringBuilder sb;
    sb.Append("hello");

    std::cout << "keccak-256: " << sb.getHash("keccak-256","hex_lower","utf-8") << "\r\n";

    // Output:
    // keccak-256: 1c8aff950685c2ed4bc3174f3472287b56d9517b9c948127319a09a7a36deac8

    // To keccak-256 hash binary data
    CkBinData bd;
    bd.AppendEncoded("00010203040506","hex");

    std::cout << "keccak-256: " << bd.getHash("keccak-256","hex_lower") << "\r\n";

    // Output:
    // keccak-256: 801560412425120fa609be232d6fa71c7f64f42aee7977267687dcc0a2f5aa63
    }