41 lines
1.4 KiB
Python
41 lines
1.4 KiB
Python
from cryptography.exceptions import *
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from cryptography.hazmat.primitives.asymmetric import rsa
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from cryptography.hazmat.primitives import hashes
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from cryptography.hazmat.primitives.asymmetric import padding
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from cryptography.hazmat.primitives import serialization
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def generate_keys():
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private_key = rsa.generate_private_key(public_exponent=65537,key_size=2048)
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public_key = private_key.public_key()
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pbc_ser = public_key.public_bytes(
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encoding=serialization.Encoding.PEM,
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format=serialization.PublicFormat.SubjectPublicKeyInfo)
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return private_key, pbc_ser
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def sign(message, private_key):
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message = bytes(str(message), 'utf-8')
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signature = private_key.sign(
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message,
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padding.PSS(mgf=padding.MGF1(hashes.SHA256()), salt_length=padding.PSS.MAX_LENGTH),
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hashes.SHA256()
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)
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return signature
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def verify(message, signature, pbc_ser):
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message = bytes(str(message), 'utf-8')
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public_key = serialization.load_pem_public_key(pbc_ser)
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try:
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public_key.verify(
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signature,
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message,
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padding.PSS(mgf=padding.MGF1(hashes.SHA256()),
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salt_length=padding.PSS.MAX_LENGTH),
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hashes.SHA256()
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)
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return True
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except InvalidSignature:
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return False
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except:
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print("Error executing 'public_key.verify'")
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return False |