Onionr/onionr/onionrcrypto/generate.py

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2019-07-25 16:14:13 +00:00
import nacl.signing, nacl.encoding, nacl.pwhash
import onionrexceptions
from onionrutils import bytesconverter
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def generate_pub_key():
'''Generate a Ed25519 public key pair, return tuple of base32encoded pubkey, privkey'''
private_key = nacl.signing.SigningKey.generate()
public_key = private_key.verify_key.encode(encoder=nacl.encoding.Base32Encoder())
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return (public_key.decode(), private_key.encode(encoder=nacl.encoding.Base32Encoder()).decode())
def generate_deterministic(passphrase, bypassCheck=False):
'''Generate a Ed25519 public key pair from a password'''
passStrength = 25
passphrase = bytesconverter.str_to_bytes(passphrase) # Convert to bytes if not already
# Validate passphrase length
if not bypassCheck:
if len(passphrase) < passStrength:
raise onionrexceptions.PasswordStrengthError("Passphase must be at least %s characters" % (passStrength,))
# KDF values
kdf = nacl.pwhash.argon2id.kdf
salt = b"U81Q7llrQcdTP0Ux" # Does not need to be unique or secret, but must be 16 bytes
ops = nacl.pwhash.argon2id.OPSLIMIT_SENSITIVE
mem = nacl.pwhash.argon2id.MEMLIMIT_SENSITIVE
key = kdf(32, passphrase, salt, opslimit=ops, memlimit=mem) # Generate seed for ed25519 key
key = nacl.signing.SigningKey(key)
return (key.verify_key.encode(nacl.encoding.Base32Encoder).decode(), key.encode(nacl.encoding.Base32Encoder).decode())