(Swift) secp256k1 Key Generation and Keccak-256

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

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func chilkatTest() {
    // 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.
    let fortuna = CkoPrng()!
    var entropy: String? = fortuna.getEntropy(32, encoding: "base64")
    var success: Bool = fortuna.addEntropy(entropy, encoding: "base64")

    let ecc = CkoEcc()!

    // Generate a random ECDSA private key on the secp256k1 curve.
    var privKey: CkoPrivateKey? = ecc.genEccKey("secp256k1", prng: fortuna)
    if ecc.lastMethodSuccess != true {
        print("\(ecc.lastErrorText!)")
        return
    }

    print("Successfully generated a sec256k1 key.")

    privKey = nil

    // Show how to compute the Keccak-256 hash in a few ways.
    let sb = CkoStringBuilder()!
    sb.append("hello")

    print("keccak-256: \(sb.getHash("keccak-256", encoding: "hex_lower", charset: "utf-8")!)")

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

    // To keccak-256 hash binary data
    let bd = CkoBinData()!
    bd.appendEncoded("00010203040506", encoding: "hex")

    print("keccak-256: \(bd.getHash("keccak-256", encoding: "hex_lower")!)")

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

}