126 lines
4.1 KiB
Python
126 lines
4.1 KiB
Python
"""
|
|
ECDSA key management
|
|
"""
|
|
|
|
from cryptography.hazmat.backends import default_backend
|
|
from cryptography.hazmat.primitives import serialization
|
|
from cryptography.hazmat.primitives.asymmetric import ed25519
|
|
from cryptography import x509
|
|
from cryptography.x509.oid import NameOID
|
|
from cryptography.hazmat.primitives import hashes
|
|
|
|
from .general import KeyClass
|
|
|
|
|
|
class Ed25519UsageError(Exception):
|
|
pass
|
|
|
|
|
|
class Ed25519Public(KeyClass):
|
|
def __init__(self, key):
|
|
self.key = key
|
|
|
|
def shortname(self):
|
|
return "ed25519"
|
|
|
|
def _unsupported(self, name):
|
|
raise Ed25519UsageError("Operation {} requires private key".format(name))
|
|
|
|
def _get_public(self):
|
|
return self.key
|
|
|
|
def get_public_bytes(self):
|
|
# The key is embedded into MBUboot in "SubjectPublicKeyInfo" format
|
|
return self._get_public().public_bytes(
|
|
encoding=serialization.Encoding.Raw,
|
|
format=serialization.PublicFormat.Raw)
|
|
|
|
def export_private(self, path, passwd=None):
|
|
self._unsupported('export_private')
|
|
|
|
def export_public(self, path):
|
|
"""Write the public key to the given file."""
|
|
pem = self._get_public().public_bytes(
|
|
encoding=serialization.Encoding.PEM,
|
|
format=serialization.PublicFormat.SubjectPublicKeyInfo)
|
|
with open(path, 'wb') as f:
|
|
f.write(pem)
|
|
|
|
def sig_type(self):
|
|
return "ED25519"
|
|
|
|
def sig_tlv(self):
|
|
return "ED25519"
|
|
|
|
def sig_len(self):
|
|
return 64
|
|
|
|
|
|
class Ed25519(Ed25519Public):
|
|
"""
|
|
Wrapper around an ECDSA private key.
|
|
"""
|
|
|
|
def __init__(self, key):
|
|
"""key should be an instance of EllipticCurvePrivateKey"""
|
|
self.key = key
|
|
|
|
@staticmethod
|
|
def generate():
|
|
pk = ed25519.Ed25519PrivateKey.generate()
|
|
return Ed25519(pk)
|
|
|
|
def _get_public(self):
|
|
return self.key.public_key()
|
|
|
|
def export_private(self, path, passwd=None):
|
|
"""
|
|
Write the private key to the given file, protecting it with the
|
|
optional password.
|
|
"""
|
|
if passwd is None:
|
|
enc = serialization.NoEncryption()
|
|
else:
|
|
enc = serialization.BestAvailableEncryption(passwd)
|
|
pem = self.key.private_bytes(
|
|
encoding=serialization.Encoding.PEM,
|
|
format=serialization.PrivateFormat.PKCS8,
|
|
encryption_algorithm=enc)
|
|
with open(path, 'wb') as f:
|
|
f.write(pem)
|
|
|
|
def sign_digest(self, digest):
|
|
"""Return the actual signature"""
|
|
return self.key.sign(data=digest)
|
|
|
|
def verify_digest(self, signature, digest):
|
|
"""Verify that signature is valid for given digest"""
|
|
k = self.key
|
|
if isinstance(self.key, ed25519.Ed25519PrivateKey):
|
|
k = self.key.public_key()
|
|
return k.verify(signature=signature, data=digest)
|
|
|
|
def create_csr(self, path):
|
|
# Generate a CSR
|
|
csr = x509.CertificateSigningRequestBuilder().subject_name(x509.Name([
|
|
# Provide various details about who we are.
|
|
x509.NameAttribute(NameOID.COUNTRY_NAME, u"CN"),
|
|
x509.NameAttribute(NameOID.STATE_OR_PROVINCE_NAME, u"Jiangsu"),
|
|
x509.NameAttribute(NameOID.LOCALITY_NAME, u"Suzhou"),
|
|
x509.NameAttribute(NameOID.ORGANIZATION_NAME, u"My Company"),
|
|
x509.NameAttribute(NameOID.COMMON_NAME, u"gigadevice.com/"),
|
|
])).add_extension(
|
|
x509.SubjectAlternativeName([
|
|
# Describe what sites we want this certificate for.
|
|
x509.DNSName(u"gigadevice.com"),
|
|
x509.DNSName(u"www.gigadevice.com"),
|
|
x509.DNSName(u"subdomain.gigadevice.com"),
|
|
]),
|
|
critical=False,
|
|
# Sign the CSR with our private key.
|
|
).sign(self.key, hashes.SHA256(), default_backend())
|
|
|
|
# Write our CSR out to disk. "path/to/csr.pem"
|
|
with open(path, "wb") as f:
|
|
f.write(csr.public_bytes(serialization.Encoding.PEM))
|