Swift

secp256k1 Key Generation and Keccak-256

See more ECC Examples

Starting in v11.0.0, Chilkat supports both secp256k1 key generation and Keccak-256 directly. These algorithms are typically used for Bitcoin and Ethereum. Swift

func chilkatTest() {
    var success: Bool = false

    // 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(numBytes: 32, encoding: "base64")
    success = fortuna.addEntropy(entropy: entropy, encoding: "base64")

    let ecc = CkoEcc()!

    // Generate a random ECDSA private key on the secp256k1 curve.
    let privKey = CkoPrivateKey()!
    success = ecc.genKey(curveName: "secp256k1", prng: fortuna, privKey: privKey)
    if success == false {
        print("\(ecc.lastErrorText!)")
        return
    }

    print("Successfully generated a sec256k1 key.")

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

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

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

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

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

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

}