Chilkat2-Python

Ed25519ph Sign and Verify

See more Ed25519 Examples

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

import sys
import chilkat2

success = False

# 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!")