key.py

import cryptography
import datetime
import pgpy



pkalg = pgpy.constants.PubKeyAlgorithm.ECDSA
curve = pgpy.constants.EllipticCurveOID.NIST_P384
super_secret_number = 12345
created = 0 # datetime
name = 'Fluffy McNopants'
comment = None
email = None
usage = { # SCAEE
    pgpy.constants.KeyFlags.Sign,
    pgpy.constants.KeyFlags.Certify,
    pgpy.constants.KeyFlags.Authentication,
    pgpy.constants.KeyFlags.EncryptCommunications,
    pgpy.constants.KeyFlags.EncryptStorage,
}



pk = cryptography.hazmat.primitives.asymmetric.ec.derive_private_key(
    super_secret_number, curve.curve(),
    cryptography.hazmat.backends.default_backend()
)

key = pgpy.PGPKey()
key._key = pgpy.packet.PrivKeyV4()
key._key.created = datetime.datetime.utcfromtimestamp(created)
key._key.pkalg = pkalg
key._key.keymaterial = pgpy.packet.fields.ECDSAPriv()
key._key.keymaterial.oid = curve
key._key.keymaterial.s = pgpy.packet.types.MPI(pk.private_numbers().private_value)
key._key.keymaterial.p = pgpy.packet.fields.ECPoint.from_values(
    curve.curve().key_size,
    pgpy.packet.fields.ECPointFormat.Standard,
    pgpy.packet.types.MPI(pk.public_key().public_numbers().x),
    pgpy.packet.types.MPI(pk.public_key().public_numbers().y),
)
key._key.keymaterial._compute_chksum()
key._key.update_hlen()
key.add_uid(
    uid = pgpy.PGPUID.new(name, comment, email),
    hash = pgpy.constants.HashAlgorithm.SHA512,
    created = created,
    usage = usage,
)

print(str(key))