289 lines
11 KiB
Python
289 lines
11 KiB
Python
'''
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Onionr - P2P Anonymous Storage Network
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This file handles Onionr's cryptography.
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'''
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'''
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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'''
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import nacl.signing, nacl.encoding, nacl.public, nacl.hash, nacl.pwhash, nacl.utils, nacl.secret, os, binascii, base64, hashlib, logger, onionrproofs, time, math, sys, hmac
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import onionrexceptions, keymanager
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# secrets module was added into standard lib in 3.6+
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if sys.version_info[0] == 3 and sys.version_info[1] < 6:
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from dependencies import secrets
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elif sys.version_info[0] == 3 and sys.version_info[1] >= 6:
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import secrets
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import config
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class OnionrCrypto:
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def __init__(self, coreInstance):
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config.reload()
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self._core = coreInstance
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self._keyFile = self._core.dataDir + 'keys.txt'
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self.pubKey = None
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self.privKey = None
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self.secrets = secrets
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self.deterministicRequirement = 25 # Min deterministic password/phrase length
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self.HASH_ID_ROUNDS = 2000
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self.keyManager = keymanager.KeyManager(self)
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# Load our own pub/priv Ed25519 keys, gen & save them if they don't exist
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if os.path.exists(self._keyFile):
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if len(config.get('general.public_key', '')) > 0:
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self.pubKey = config.get('general.public_key')
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else:
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self.pubKey = self.keyManager.getPubkeyList()[0]
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self.privKey = self.keyManager.getPrivkey(self.pubKey)
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else:
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keys = self.generatePubKey()
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self.pubKey = keys[0]
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self.privKey = keys[1]
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self.keyManager.addKey(self.pubKey, self.privKey)
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return
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def edVerify(self, data, key, sig, encodedData=True):
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'''Verify signed data (combined in nacl) to an ed25519 key'''
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try:
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key = nacl.signing.VerifyKey(key=key, encoder=nacl.encoding.Base32Encoder)
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except nacl.exceptions.ValueError:
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#logger.debug('Signature by unknown key (cannot reverse hash)')
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return False
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except binascii.Error:
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logger.warn('Could not load key for verification, invalid padding')
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return False
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retData = False
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sig = base64.b64decode(sig)
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try:
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data = data.encode()
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except AttributeError:
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pass
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if encodedData:
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try:
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retData = key.verify(data, sig) # .encode() is not the same as nacl.encoding
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except nacl.exceptions.BadSignatureError:
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pass
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else:
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try:
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retData = key.verify(data, sig)
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except nacl.exceptions.BadSignatureError:
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pass
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return retData
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def edSign(self, data, key, encodeResult=False):
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'''Ed25519 sign data'''
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try:
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data = data.encode()
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except AttributeError:
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pass
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key = nacl.signing.SigningKey(seed=key, encoder=nacl.encoding.Base32Encoder)
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retData = ''
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if encodeResult:
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retData = key.sign(data, encoder=nacl.encoding.Base64Encoder).signature.decode() # .encode() is not the same as nacl.encoding
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else:
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retData = key.sign(data).signature
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return retData
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def pubKeyEncrypt(self, data, pubkey, anonymous=True, encodedData=False):
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'''Encrypt to a public key (Curve25519, taken from base32 Ed25519 pubkey)'''
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retVal = ''
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try:
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pubkey = pubkey.encode()
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except AttributeError:
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pass
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if encodedData:
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encoding = nacl.encoding.Base64Encoder
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else:
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encoding = nacl.encoding.RawEncoder
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if self.privKey != None and not anonymous:
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ownKey = nacl.signing.SigningKey(seed=self.privKey, encoder=nacl.encoding.Base32Encoder).to_curve25519_private_key()
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key = nacl.signing.VerifyKey(key=pubkey, encoder=nacl.encoding.Base32Encoder).to_curve25519_public_key()
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ourBox = nacl.public.Box(ownKey, key)
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retVal = ourBox.encrypt(data.encode(), encoder=encoding)
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elif anonymous:
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key = nacl.signing.VerifyKey(key=pubkey, encoder=nacl.encoding.Base32Encoder).to_curve25519_public_key()
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anonBox = nacl.public.SealedBox(key)
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try:
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data = data.encode()
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except AttributeError:
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pass
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retVal = anonBox.encrypt(data, encoder=encoding)
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return retVal
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def pubKeyDecrypt(self, data, pubkey='', privkey='', anonymous=False, encodedData=False):
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'''pubkey decrypt (Curve25519, taken from Ed25519 pubkey)'''
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decrypted = False
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if encodedData:
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encoding = nacl.encoding.Base64Encoder
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else:
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encoding = nacl.encoding.RawEncoder
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ownKey = nacl.signing.SigningKey(seed=self.privKey, encoder=nacl.encoding.Base32Encoder()).to_curve25519_private_key()
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if self.privKey != None and not anonymous:
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ourBox = nacl.public.Box(ownKey, pubkey)
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decrypted = ourBox.decrypt(data, encoder=encoding)
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elif anonymous:
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if self._core._utils.validatePubKey(privkey):
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privkey = nacl.signing.SigningKey(seed=privkey, encoder=nacl.encoding.Base32Encoder()).to_curve25519_private_key()
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anonBox = nacl.public.SealedBox(privkey)
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else:
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anonBox = nacl.public.SealedBox(ownKey)
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decrypted = anonBox.decrypt(data, encoder=encoding)
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return decrypted
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def symmetricEncrypt(self, data, key, encodedKey=False, returnEncoded=True):
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'''Encrypt data to a 32-byte key (Salsa20-Poly1305 MAC)'''
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if encodedKey:
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encoding = nacl.encoding.Base64Encoder
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else:
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encoding = nacl.encoding.RawEncoder
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# Make sure data is bytes
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if type(data) != bytes:
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data = data.encode()
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box = nacl.secret.SecretBox(key, encoder=encoding)
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if returnEncoded:
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encoding = nacl.encoding.Base64Encoder
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else:
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encoding = nacl.encoding.RawEncoder
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encrypted = box.encrypt(data, encoder=encoding)
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return encrypted
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def symmetricDecrypt(self, data, key, encodedKey=False, encodedMessage=False, returnEncoded=False):
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'''Decrypt data to a 32-byte key (Salsa20-Poly1305 MAC)'''
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if encodedKey:
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encoding = nacl.encoding.Base64Encoder
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else:
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encoding = nacl.encoding.RawEncoder
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box = nacl.secret.SecretBox(key, encoder=encoding)
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if encodedMessage:
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encoding = nacl.encoding.Base64Encoder
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else:
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encoding = nacl.encoding.RawEncoder
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decrypted = box.decrypt(data, encoder=encoding)
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if returnEncoded:
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decrypted = base64.b64encode(decrypted)
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return decrypted
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def generateSymmetricPeer(self, peer):
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'''Generate symmetric key for a peer and save it to the peer database'''
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key = self.generateSymmetric()
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self._core.setPeerInfo(peer, 'forwardKey', key)
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return
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def generateSymmetric(self):
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'''Generate a symmetric key (bytes) and return it'''
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return binascii.hexlify(nacl.utils.random(nacl.secret.SecretBox.KEY_SIZE))
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def generatePubKey(self):
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'''Generate a Ed25519 public key pair, return tuple of base32encoded pubkey, privkey'''
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private_key = nacl.signing.SigningKey.generate()
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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())
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def generateDeterministic(self, passphrase, bypassCheck=False):
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'''Generate a Ed25519 public key pair from a password'''
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passStrength = self.deterministicRequirement
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passphrase = self._core._utils.strToBytes(passphrase) # Convert to bytes if not already
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# Validate passphrase length
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if not bypassCheck:
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if len(passphrase) < passStrength:
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raise onionrexceptions.PasswordStrengthError("Passphase must be at least %s characters" % (passStrength,))
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# KDF values
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kdf = nacl.pwhash.argon2id.kdf
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salt = b"U81Q7llrQcdTP0Ux" # Does not need to be unique or secret, but must be 16 bytes
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ops = nacl.pwhash.argon2id.OPSLIMIT_SENSITIVE
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mem = nacl.pwhash.argon2id.MEMLIMIT_SENSITIVE
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key = kdf(nacl.secret.SecretBox.KEY_SIZE, passphrase, salt, opslimit=ops, memlimit=mem)
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key = nacl.public.PrivateKey(key, nacl.encoding.RawEncoder())
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publicKey = key.public_key
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return (publicKey.encode(encoder=nacl.encoding.Base32Encoder()),
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key.encode(encoder=nacl.encoding.Base32Encoder()))
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def pubKeyHashID(self, pubkey=''):
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'''Accept a ed25519 public key, return a truncated result of X many sha3_256 hash rounds'''
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if pubkey == '':
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pubkey = self.pubKey
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prev = ''
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pubkey = pubkey.encode()
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for i in range(self.HASH_ID_ROUNDS):
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try:
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prev = prev.encode()
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except AttributeError:
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pass
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hasher = hashlib.sha3_256()
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hasher.update(pubkey + prev)
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prev = hasher.hexdigest()
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result = prev
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return result
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def sha3Hash(self, data):
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try:
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data = data.encode()
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except AttributeError:
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pass
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hasher = hashlib.sha3_256()
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hasher.update(data)
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return hasher.hexdigest()
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def blake2bHash(self, data):
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try:
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data = data.encode()
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except AttributeError:
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pass
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return nacl.hash.blake2b(data)
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def verifyPow(self, blockContent):
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'''
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Verifies the proof of work associated with a block
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'''
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retData = False
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dataLen = len(blockContent)
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try:
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blockContent = blockContent.encode()
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except AttributeError:
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pass
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blockHash = self.sha3Hash(blockContent)
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try:
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blockHash = blockHash.decode() # bytes on some versions for some reason
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except AttributeError:
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pass
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difficulty = onionrproofs.getDifficultyForNewBlock(blockContent, ourBlock=False)
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if difficulty < int(config.get('general.minimum_block_pow')):
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difficulty = int(config.get('general.minimum_block_pow'))
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mainHash = '0000000000000000000000000000000000000000000000000000000000000000'#nacl.hash.blake2b(nacl.utils.random()).decode()
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puzzle = mainHash[:difficulty]
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if blockHash[:difficulty] == puzzle:
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# logger.debug('Validated block pow')
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retData = True
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else:
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logger.debug("Invalid token, bad proof")
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return retData
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def safeCompare(self, one, two):
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return hmac.compare_digest(one, two)
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