(CkPython) Ed25519 Sign and Verify

Demonstrates how to create an Ed25519 signature, and then to verify it.

Note: This example requires Chilkat v9.5.0.83 or greater.

Chilkat Python Downloads install with pip pip3 install chilkat or download... Python Module for Windows, MacOS, Linux, Alpine Linux, Solaris

import sys
import chilkat

# This example assumes the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

privKeyHex = "1498b5467a63dffa2dc9d9e069caf075d16fc33fdd4c3b01bfadae6433767d93"
pubKeyHex = "b7a3c12dc0c8c748ab07525b701122b88bd78f600c76342d27f25e5f92444cde"

privKey = chilkat.CkPrivateKey()
# This example shows only one way of loading an Ed25519 private key.
# Chilkat can load other formats (JWK, PEM, ASN.1 DER, etc.)  
# You may do so by calling LoadAnyFormat or LoadAnyFormatFile.
success = privKey.LoadEd25519(privKeyHex,pubKeyHex)
if (success == False):
    print(privKey.lastErrorText())
    sys.exit()

# The data to be signed...
bd = chilkat.CkBinData()
bd.AppendString("Message for Ed25519 signing","utf-8")

eddsa = chilkat.CkEdDSA()
hexSig = eddsa.signBdENC(bd,"hexlower",privKey)

print("signature = " + hexSig)

# The expected output is: 6dd355667fae4eb43c6e0ab92e870edb2de0a88cae12dbd8591507f584fe4912babff497f1b8edf9567d2483d54ddc6459bea7855281b7a246a609e3001a4e08

# Verify the signature..
pubKey = chilkat.CkPublicKey()
success = pubKey.LoadEd25519(pubKeyHex)
if (success == False):
    print(pubKey.lastErrorText())
    sys.exit()

bVerified = eddsa.VerifyBdENC(bd,hexSig,"hexlower",pubKey)
if (bVerified == False):
    print(eddsa.lastErrorText())
    print("Failed to verify the signature.")
    sys.exit()

print("The Ed25519 signature is verified!")