Tcl

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. Tcl

load ./chilkat.dll

set success 0

# 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.
set fortuna [new_CkPrng]

set entropy [CkPrng_getEntropy $fortuna 32 "base64"]
set success [CkPrng_AddEntropy $fortuna $entropy "base64"]

set ecc [new_CkEcc]

# Generate a random ECDSA private key on the secp256k1 curve.
set privKey [new_CkPrivateKey]

set success [CkEcc_GenKey $ecc "secp256k1" $fortuna $privKey]
if {$success == 0} then {
    puts [CkEcc_lastErrorText $ecc]
    delete_CkPrng $fortuna
    delete_CkEcc $ecc
    delete_CkPrivateKey $privKey
    exit
}

puts "Successfully generated a sec256k1 key."

# Show how to compute the Keccak-256 hash in a few ways.
set sb [new_CkStringBuilder]

CkStringBuilder_Append $sb "hello"

puts "keccak-256: [CkStringBuilder_getHash $sb keccak-256 hex_lower utf-8]"

# Output:
# keccak-256: 1c8aff950685c2ed4bc3174f3472287b56d9517b9c948127319a09a7a36deac8

# To keccak-256 hash binary data
set bd [new_CkBinData]

CkBinData_AppendEncoded $bd "00010203040506" "hex"

puts "keccak-256: [CkBinData_getHash $bd keccak-256 hex_lower]"

# Output:
# keccak-256: 801560412425120fa609be232d6fa71c7f64f42aee7977267687dcc0a2f5aa63

delete_CkPrng $fortuna
delete_CkEcc $ecc
delete_CkPrivateKey $privKey
delete_CkStringBuilder $sb
delete_CkBinData $bd