B4X Requires Chilkat v11.0.0+

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. B4X

Dim success As Boolean = 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.
Dim fortuna As ChilkatPrng
fortuna.Initialize
Dim entropy As String = fortuna.GetEntropy(32, "base64")
success = fortuna.AddEntropy(entropy, "base64")

Dim ecc As ChilkatEcc
ecc.Initialize

'  Generate a random ECDSA private key on the secp256k1 curve.
Dim privKey As ChilkatPrivateKey
privKey.Initialize("privKey")
success = ecc.GenKey("secp256k1", fortuna, privKey)
If success = False Then
    Log(ecc.LastErrorText)
    Return
End If


Log("Successfully generated a sec256k1 key.")

'  Show how to compute the Keccak-256 hash in a few ways.
Dim sb As ChilkatStringBuilder
sb.Initialize
sb.Append("hello")

Log("keccak-256: " & sb.GetHash("keccak-256", "hex_lower", "utf-8"))

'  Output:
'  keccak-256: 1c8aff950685c2ed4bc3174f3472287b56d9517b9c948127319a09a7a36deac8

'  To keccak-256 hash binary data
Dim bd As ChilkatBinData
bd.Initialize
bd.AppendEncoded("00010203040506", "hex")

Log("keccak-256: " & bd.GetHash("keccak-256", "hex_lower"))

'  Output:
'  keccak-256: 801560412425120fa609be232d6fa71c7f64f42aee7977267687dcc0a2f5aa63