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fixed autokey

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This commit is contained in:
Student 2025-08-19 08:32:10 +05:30
parent 493d31e3c6
commit de98ad4268
2 changed files with 14 additions and 32 deletions
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11
IS/Lab/Lab3/DiffieHellman.py
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@ -38,12 +38,6 @@ def int_to_fixed_length_bytes(value: int, length_bits: int) -> bytes:
def generate_keypair(p: int, g: int, private_bits: int = 256) -> tuple[int, int]:
"""
Generate a Diffie-Hellman private/public key pair.
- private_bits controls the size of the secret exponent for performance and security.
256 bits is a common choice for Group 14.
"""
a = 0
while a < 2:
a = number.getRandomNBitInteger(private_bits)
@ -52,10 +46,6 @@ def generate_keypair(p: int, g: int, private_bits: int = 256) -> tuple[int, int]
def derive_shared_key(peer_public: int, private: int, p: int, key_len: int = 32) -> bytes:
"""
Compute the shared secret and derive a symmetric key using HKDF-SHA256.
Returns key_len bytes (default 32 bytes = 256-bit key).
"""
shared_secret = pow(peer_public, private, p)
# Use fixed-length big-endian encoding of the shared secret for KDF input
shared_bytes = int_to_fixed_length_bytes(shared_secret, p.bit_length())
@ -63,7 +53,6 @@ def derive_shared_key(peer_public: int, private: int, p: int, key_len: int = 32)
return key
@dataclass
class TimingResult:
alice_keygen_s: float
bob_keygen_s: float