Implement PBKDF2 support in keyfile

---

Squashed commit of the following:

commit 4a4f76b19c
Author: idaapayo <idaapayo@gmail.com>
Date:   Mon Jan 24 20:12:34 2022 +0300

    remove unused import and renaming pbkdf2 default params

commit 23a94c3ba1
Author: idaapayo <idaapayo@gmail.com>
Date:   Mon Jan 24 20:07:22 2022 +0300

    defaulting to scrypt in to_dict fun

commit 1c0047398a
Author: idaapayo <idaapayo@gmail.com>
Date:   Mon Jan 24 15:12:38 2022 +0300

    making final review  changes

commit 0a4f3eaa98
Merge: b208533 903f659
Author: Mohamed Sohail <kamikazechaser@noreply.localhost>
Date:   Mon Jan 24 11:10:35 2022 +0000

    Merge branch 'master' into Ida/pbkdf2

commit b20853312d
Author: idaapayo <idaapayo@gmail.com>
Date:   Mon Jan 24 13:23:12 2022 +0300

    review changes with tests

commit b9c6db414b
Author: idaapayo <idaapayo@gmail.com>
Date:   Fri Jan 21 11:13:35 2022 +0300

    making review changes

commit 1f5d057a9a
Author: idaapayo <idaapayo@gmail.com>
Date:   Wed Jan 19 14:37:22 2022 +0300

    second pbkdf2 implementation

commit 01598a8c59
Author: idaapayo <idaapayo@gmail.com>
Date:   Wed Jan 19 13:49:29 2022 +0300

    pkdf2 implementation

funga/eth/keystore/keyfile.py

@@ -24,10 +24,11 @@ algo_keywords = [
     'aes-128-ctr',
 ]
 hash_keywords = [
-    'scrypt'
+    'scrypt',
+    'pbkdf2'
 ]
 
-default_kdfparams = {
+default_scrypt_kdfparams = {
     'dklen': 32,
     'n': 1 << 18,
     'p': 1,
@@ -35,6 +36,12 @@ default_kdfparams = {
     'salt': os.urandom(32).hex(),
 }
 
+default_pbkdf2_kdfparams = {
+    'c': 100000,
+    'dklen': 32,
+    'prf': 'sha256',
+    'salt': os.urandom(32).hex(),
+}
 
 def to_mac(mac_key, ciphertext_bytes):
     h = sha3.keccak_256()
@@ -46,18 +53,32 @@ def to_mac(mac_key, ciphertext_bytes):
 class Hashes:
 
     @staticmethod
-    def from_scrypt(kdfparams=default_kdfparams, passphrase=''):
+    def from_scrypt(kdfparams=default_scrypt_kdfparams, passphrase=''):
         dklen = int(kdfparams['dklen'])
         n = int(kdfparams['n'])
         p = int(kdfparams['p'])
         r = int(kdfparams['r'])
         salt = bytes.fromhex(kdfparams['salt'])
 
-        return hashlib.scrypt(passphrase.encode('utf-8'), salt=salt,n=n, p=p, r=r, maxmem=1024*1024*1024, dklen=dklen)
+        return hashlib.scrypt(passphrase.encode('utf-8'), salt=salt, n=n, p=p, r=r, maxmem=1024 * 1024 * 1024,
+                              dklen=dklen)
+
+    @staticmethod
+    def from_pbkdf2(kdfparams=default_pbkdf2_kdfparams, passphrase=''):
+        if kdfparams['prf'] == 'hmac-sha256':
+            kdfparams['prf'].replace('hmac-sha256','sha256')
+
+        derived_key = hashlib.pbkdf2_hmac(
+            hash_name='sha256',
+            password=passphrase.encode('utf-8'),
+            salt=bytes.fromhex(kdfparams['salt']),
+            iterations=int(kdfparams['c']),
+            dklen=int(kdfparams['dklen'])
+        )
+        return derived_key
 
 
 class Ciphers:
-
     aes_128_block_size = 1 << 7
     aes_iv_len = 16
 
@@ -68,7 +89,6 @@ class Ciphers:
         plaintext = cipher.decrypt(ciphertext)
         return plaintext
 
-
     @staticmethod
     def encrypt_aes_128_ctr(plaintext, encryption_key, iv):
         ctr = Counter.new(Ciphers.aes_128_block_size, initial_value=iv)
@@ -77,11 +97,19 @@ class Ciphers:
         return ciphertext
 
 
-def to_dict(private_key_bytes, passphrase=''):
+def to_dict(private_key_bytes, kdf='scrypt', passphrase=''):
-   
     private_key = coincurve.PrivateKey(secret=private_key_bytes)
 
+    if kdf == 'scrypt':
         encryption_key = Hashes.from_scrypt(passphrase=passphrase)
+        kdfparams = default_scrypt_kdfparams
+
+    elif kdf == 'pbkdf2':
+        encryption_key = Hashes.from_pbkdf2(passphrase=passphrase)
+        kdfparams = pbkdf2_kdfparams
+
+    else:
+        raise NotImplementedError("KDF not implemented: {0}".format(kdf))
 
     address_hex = private_key_to_address(private_key)
     iv_bytes = os.urandom(Ciphers.aes_iv_len)
@@ -96,8 +124,8 @@ def to_dict(private_key_bytes, passphrase=''):
         'cipherparams': {
             'iv': iv_bytes.hex(),
         },
-        'kdf': 'scrypt',
+        'kdf': kdf,
-        'kdfparams': default_kdfparams,
+        'kdfparams': kdfparams,
         'mac': mac.hex(),
     }
 
@@ -112,7 +140,6 @@ def to_dict(private_key_bytes, passphrase=''):
 
 
 def from_dict(o, passphrase=''):
-
     cipher = o['crypto']['cipher']
     if cipher not in algo_keywords:
         raise NotImplementedError('cipher "{}" not implemented'.format(cipher))
@@ -145,7 +172,6 @@ def from_dict(o, passphrase=''):
 
 
 def from_file(filepath, passphrase=''):
-
     f = open(filepath, 'r')
     try:
         o = json.load(f)

funga/eth/runnable/keyfile.py

@@ -16,6 +16,8 @@ from funga.eth.keystore.keyfile import (
         from_file,
         to_dict,
         )
+
+
 from funga.eth.encoding import (
         private_key_to_address,
         private_key_from_bytes,

tests/test_cli.py

@@ -5,10 +5,18 @@ import os
 
 # external imports
 from hexathon import strip_0x
+from pathlib import Path
+
+import sys
+path_root = Path('/home/vincent/ida/grassroots/funga-eth/funga/eth/keystore')
+sys.path.append(str(path_root))
+print(sys.path)
 
 # local imports
 from funga.eth.signer import EIP155Signer
 from funga.eth.keystore.dict import DictKeystore
+
+
 from funga.eth.cli.handle import SignRequestHandler
 from funga.eth.transaction import EIP155Transaction
 
@@ -18,6 +26,7 @@ logg = logging.getLogger()
 script_dir = os.path.dirname(os.path.realpath(__file__))
 data_dir = os.path.join(script_dir, 'testdata')
 
+
 class TestCli(unittest.TestCase):
 
     def setUp(self):
@@ -29,7 +38,6 @@ class TestCli(unittest.TestCase):
         SignRequestHandler.signer = self.signer
         self.handler = SignRequestHandler()
 
-
     def test_new_account(self):
         q = {
             'id': 0,
@@ -39,9 +47,9 @@ class TestCli(unittest.TestCase):
         (rpc_id, result) = self.handler.process_input(q)
         self.assertTrue(self.keystore.get(result))
 
-
     def test_sign_tx(self):
-        keystore_file = os.path.join(data_dir, 'UTC--2021-01-08T18-37-01.187235289Z--00a329c0648769a73afac7f9381e08fb43dbea72')
+        keystore_file = os.path.join(data_dir,
+                                     'UTC--2021-01-08T18-37-01.187235289Z--00a329c0648769a73afac7f9381e08fb43dbea72')
         sender = self.keystore.import_keystore_file(keystore_file)
         tx_hexs = {
             'nonce': '0x',
@@ -69,10 +77,14 @@ class TestCli(unittest.TestCase):
         (rpc_id, result) = self.handler.process_input(q)
         logg.debug('result {}'.format(result))
 
-        self.assertEqual(strip_0x(result), 'f86c2a8504a817c8008252089435353535353535353535353535353535353535358203e884deadbeef82466aa0b7c1bbf52f736ada30fe253c7484176f44d6fd097a9720dc85ae5bbc7f060e54a07afee2563b0cf6d00333df51cc62b0d13c63108b2bce54ce2ad24e26ce7b4f25')
+        self.assertEqual(strip_0x(result),
+                         'f86c2a8504a817c8008252089435353535353535353535353535353535353535358203e884deadbeef82466aa0b7c1bbf52f736ada30fe253c7484176f44d6fd097a9720dc85ae5bbc7f060e54a07afee2563b0cf6d00333df51cc62b0d13c63108b2bce54ce2ad24e26ce7b4f25')
+
+
 
     def test_sign_msg(self):
-        keystore_file = os.path.join(data_dir, 'UTC--2021-01-08T18-37-01.187235289Z--00a329c0648769a73afac7f9381e08fb43dbea72')
+        keystore_file = os.path.join(data_dir,
+                                     'UTC--2021-01-08T18-37-01.187235289Z--00a329c0648769a73afac7f9381e08fb43dbea72')
         sender = self.keystore.import_keystore_file(keystore_file)
         q = {
             'id': 0,
@@ -81,7 +93,8 @@ class TestCli(unittest.TestCase):
         }
         (rpc_id, result) = self.handler.process_input(q)
         logg.debug('result msg {}'.format(result))
-        self.assertEqual(strip_0x(result), '50320dda75190a121b7b5979de66edadafd02bdfbe4f6d49552e79c01410d2464aae35e385c0e5b61663ff7b44ef65fa0ac7ad8a57472cf405db399b9dba3e1600')
+        self.assertEqual(strip_0x(result),
+                         '50320dda75190a121b7b5979de66edadafd02bdfbe4f6d49552e79c01410d2464aae35e385c0e5b61663ff7b44ef65fa0ac7ad8a57472cf405db399b9dba3e1600')
 
 
 if __name__ == '__main__':

tests/test_pbkdf2.py

@@ -0,0 +1,59 @@
+#!/usr/bin/python
+
+# standard imports
+import unittest
+import logging
+import base64
+import os
+
+# external imports
+from hexathon import (
+    strip_0x,
+    add_0x,
+)
+
+# local imports
+from funga.error import UnknownAccountError
+from funga.eth.keystore.dict import DictKeystore
+from funga.eth.signer import EIP155Signer
+
+logging.basicConfig(level=logging.DEBUG)
+logg = logging.getLogger()
+
+script_dir = os.path.realpath(os.path.dirname(__file__))
+
+
+class TestDict(unittest.TestCase):
+    address_hex = None
+    db = None
+
+    def setUp(self):
+        self.db = DictKeystore()
+
+        keystore_filepath = os.path.join(script_dir, 'testdata',
+                                         'UTC--2022-01-24T10-34-04Z--cc47ad90-71a0-7fbe-0224-63326e27263a')
+
+        address_hex = self.db.import_keystore_file(keystore_filepath, 'test')
+        self.address_hex = add_0x(address_hex)
+
+    def tearDown(self):
+        pass
+
+    def test_get_key(self):
+        logg.debug('getting {}'.format(strip_0x(self.address_hex)))
+        pk = self.db.get(strip_0x(self.address_hex), '')
+
+        self.assertEqual(self.address_hex.lower(), '0xb8df77e1b4fa142e83bf9706f66fd76ad2a564f8')
+
+        bogus_account = os.urandom(20).hex()
+        with self.assertRaises(UnknownAccountError):
+            self.db.get(bogus_account, '')
+
+    def test_sign_message(self):
+        s = EIP155Signer(self.db)
+        z = s.sign_ethereum_message(strip_0x(self.address_hex), b'foo')
+        logg.debug('zzz {}'.format(str(z)))
+
+
+if __name__ == '__main__':
+    unittest.main()

tests/testdata/UTC--2022-01-24T10-34-04Z--cc47ad90-71a0-7fbe-0224-63326e27263a

@@ -0,0 +1 @@
+{"id":"cc47ad90-71a0-7fbe-0224-63326e27263a","version":3,"crypto":{"cipher":"aes-128-ctr","cipherparams":{"iv":"7bff67c888a9878a88e8548a4598322d"},"ciphertext":"0cb0e3c69d224d0a645f2784b64f507e5aecdc7bb8a7ea31963d25e6b8020ccf","kdf":"pbkdf2","kdfparams":{"c":10240,"dklen":32,"prf":"hmac-sha256","salt":"02f8b51b07a66a357c2d812952e6bee70fccc2e6a55e7cbd5c22d97d32fa8873"},"mac":"bb45aaabdb9fbbbde89631444ac39f8d76107381f16591799664274fd5d8c5bb"},"address":"b8df77e1b4fa142e83bf9706f66fd76ad2a564f8","name":"","meta":"{}"}