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"""This module provides methods for asymmetric cryptography."""
import cryptography.hazmat.primitives.asymmetric as _asymmetric
import cryptography.hazmat.primitives.hashes as _hashes
import cryptography.hazmat.primitives.serialization as _serialization
def load_pem_private_key(data, password=None):
"""Load RSA PEM certificate."""
key = _serialization.load_pem_private_key(data, password)
return key
def key_sign(rsakey, message, digest):
"""Sign the given message with the RSA key."""
padding = _asymmetric.padding.PKCS1v15()
signature = rsakey.sign(message, padding, digest)
return signature
def key_verify(rsakey, signature, message, digest):
"""Verify the given signature with the RSA key."""
padding = _asymmetric.padding.PKCS1v15()
if isinstance(rsakey, _asymmetric.rsa.RSAPrivateKey):
rsakey = rsakey.public_key()
try:
rsakey.verify(signature, message, padding, digest)
except Exception as e:
return False
else:
return True
hashes = _hashes
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