Chilkat2-Python

Generate ECDSA Key and Get Details as XML

See more ECC Examples

Demonstrates how to generate an ECDSA key and gets the parts as XML. Chilkat2-Python

import sys
import chilkat2

success = False

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

ecc = chilkat2.Ecc()

# Generate a random ECC private key on the secp256k1 curve.
# Chilkat also supports other curves, such as secp384r1, secp521r1, and secp256r1.

# Create a Fortuna PRNG and seed it with system entropy.
# This will be our source of random data for generating the ECC private key.
fortuna = chilkat2.Prng()
entropy = fortuna.GetEntropy(32,"base64")
success = fortuna.AddEntropy(entropy,"base64")

privKey = chilkat2.PrivateKey()
success = ecc.GenKey("secp256k1",fortuna,privKey)
if (success == False):
    print(ecc.LastErrorText)
    sys.exit()

# An EC private key has this ASN.1
# ECPrivateKey ::= SEQUENCE {
#     version        INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1),
#     privateKey     OCTET STRING,
#     parameters [0] ECParameters {{ NamedCurve }} OPTIONAL,
#     publicKey  [1] BIT STRING OPTIONAL (This is the ANSI X9.63 public key format.)

asn = chilkat2.Asn()
success = asn.LoadEncoded(privKey.GetPkcs1ENC("base64"),"base64")
if (success != True):
    print(asn.LastErrorText)
    sys.exit()

xml = chilkat2.Xml()
xml.LoadXml(asn.AsnToXml())

print(xml.GetXml())

# The XML looks like this:
# <?xml version="1.0" encoding="utf-8" ?>
# <sequence>
#     <int>01</int>
#     <octets>JgJvBG+3wletkJab8iXAkpz0O8/AgWZSpkYVcB7SpnU=</octets>
#     <contextSpecific tag="0" constructed="1">
#         <oid>1.3.132.0.10</oid>
#     </contextSpecific>
# </sequence>

# The 32-byte private key is in the octets..
# Get it as hex.
crypt = chilkat2.Crypt2()
privKeyHex = crypt.ReEncode(xml.GetChildContent("octets"),"base64","hex")

print("EC private key as hex = " + privKeyHex)