(Chilkat2-Python) Ed25519ph Sign and Verify

Demonstrates how to create an Ed25519ph signature, and then to verify it.

Note: This example requires Chilkat v9.5.0.91 or greater.

Chilkat2 Python Downloads install with pip pip3 install chilkat2 or download... Python Module for Windows, Linux, Alpine Linux, MacOS, Solaris

import sys
import chilkat2

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

# Use the following test vector from https://www.rfc-editor.org/rfc/rfc8032#page-30

#    -----TEST abc
# 
#    ALGORITHM:
#    Ed25519ph
# 
#    SECRET KEY:
#    833fe62409237b9d62ec77587520911e
#    9a759cec1d19755b7da901b96dca3d42
# 
#    PUBLIC KEY:
#    ec172b93ad5e563bf4932c70e1245034
#    c35467ef2efd4d64ebf819683467e2bf
# 
#    MESSAGE (length 3 bytes):
#    616263
# 
#    SIGNATURE:
#    98a70222f0b8121aa9d30f813d683f80
#    9e462b469c7ff87639499bb94e6dae41
#    31f85042463c2a355a2003d062adf5aa
#    a10b8c61e636062aaad11c2a26083406

privKeyHex = "833fe62409237b9d62ec77587520911e9a759cec1d19755b7da901b96dca3d42"
pubKeyHex = "ec172b93ad5e563bf4932c70e1245034c35467ef2efd4d64ebf819683467e2bf"

privKey = chilkat2.PrivateKey()
success = privKey.LoadEd25519(privKeyHex,pubKeyHex)
if (success == False):
    print(privKey.LastErrorText)
    sys.exit()

# The data to be signed...
bd = chilkat2.BinData()
bd.AppendEncoded("616263","hex")

eddsa = chilkat2.EdDSA()
# Indicate we want the Ed25519ph instance.
eddsa.Algorithm = "Ed25519ph"

hexSig = eddsa.SignBdENC(bd,"hexlower",privKey)

print("signature = " + hexSig)

# The expected output is: 98a70222f0b8121aa9d30f813d683f80....

# Verify the signature..
pubKey = chilkat2.PublicKey()
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 Ed25519ph signature is verified!")