bcb-0024
1.000
Challenge · difficulty 2/5
# BigCodeBench/24
Implement a file **`solution.py`** that completes the function below. Keep the given name and signature; define `task_func` at module level.
Allowed libraries: `base64`, `hashlib`, `os`.
```python
import base64
import hashlib
import os
def task_func(password, SALT_LENGTH = 32):
"""
Hashes a password using the PBKDF2 HMAC algorithm with SHA-256 as the hashing algorithm,
combined with a randomly generated salt, and returns both the salt and the hashed password,
each base64-encoded.
Parameters:
password (str): The password to be hashed.
SALT_LENGTH (int): the length of the randomly generated salt.
Returns:
tuple[bytes, bytes]: A tuple containing the base64-encoded salt and the base64-encoded hashed password as byte strings.
Raises:
ValueError if the password is None or empty
Requirements:
- base64
- hashlib
- os
Example:
>>> salt, hashed_password = task_func('my_password')
>>> isinstance(salt, bytes)
True
>>> isinstance(hashed_password, bytes)
True
"""
```
<!-- imported from BigCodeBench (BigCodeBench/24) -->
tests/test_bcb_0024.py
# Auto-generated from BigCodeBench BigCodeBench/24. Do not edit by hand.
import pathlib as _pathlib
exec(_pathlib.Path(__file__).with_name("solution.py").read_text(), globals())
import unittest
import base64
import hashlib
import os
class TestCases(unittest.TestCase):
def decode_and_regenerate_password(self, encoded_salt, encoded_hashed_password, original_password):
""" Helper function to decode base64 encoded salt and password, and regenerate the hashed password. """
decoded_salt = base64.b64decode(encoded_salt)
decoded_hashed_password = base64.b64decode(encoded_hashed_password)
regenerated_hashed_password = hashlib.pbkdf2_hmac('sha256', original_password.encode(), decoded_salt, 100000)
return regenerated_hashed_password, decoded_hashed_password
def test_case_1(self):
""" Testing with a simple password """
salt, hashed_password = task_func('password123')
self.assertTrue(isinstance(salt, bytes) and isinstance(hashed_password, bytes))
regenerated, original = self.decode_and_regenerate_password(salt, hashed_password, 'password123')
self.assertEqual(regenerated, original)
def test_case_2(self):
""" Testing with a password containing special characters """
salt, hashed_password = task_func('p@ssw0rd$%^&*')
self.assertTrue(isinstance(salt, bytes) and isinstance(hashed_password, bytes))
regenerated, original = self.decode_and_regenerate_password(salt, hashed_password, 'p@ssw0rd$%^&*')
self.assertEqual(regenerated, original)
def test_case_3(self):
""" Testing with a long password """
long_password = 'a' * 1000
salt, hashed_password = task_func(long_password)
self.assertTrue(isinstance(salt, bytes) and isinstance(hashed_password, bytes))
regenerated, original = self.decode_and_regenerate_password(salt, hashed_password, long_password)
self.assertEqual(regenerated, original)
def test_case_4(self):
""" Testing with a short password """
short_password = 'a'
salt, hashed_password = task_func(short_password)
self.assertTrue(isinstance(salt, bytes) and isinstance(hashed_password, bytes))
regenerated, original = self.decode_and_regenerate_password(salt, hashed_password, short_password)
self.assertEqual(regenerated, original)
def test_case_5(self):
""" Testing with a password that is a number """
number_password = '1234567890'
salt, hashed_password = task_func(number_password)
self.assertTrue(isinstance(salt, bytes) and isinstance(hashed_password, bytes))
regenerated, original = self.decode_and_regenerate_password(salt, hashed_password, number_password)
self.assertEqual(regenerated, original)
def test_invalid_input(self):
""" Testing with invalid input such as None or empty string """
with self.assertRaises(ValueError):
task_func(None)
System prompt
You are an expert programmer. Solve the task exactly as specified. Output your solution as fenced code blocks using the required file name(s) and the exact function/type signatures requested. Prefer correctness; do not include prose outside code unless asked.
Proposed solution
```python
import base64
import hashlib
import os
def task_func(password, SALT_LENGTH = 32):
"""
Hashes a password using the PBKDF2 HMAC algorithm with SHA-256 as the hashing algorithm,
combined with a randomly generated salt, and returns both the salt and the hashed password,
each base64-encoded.
Parameters:
password (str): The password to be hashed.
SALT_LENGTH (int): the length of the randomly generated salt.
Returns:
tuple[bytes, bytes]: A tuple containing the base64-encoded salt and the base64-encoded hashed password as byte strings.
Raises:
ValueError if the password is None or empty
Requirements:
- base64
- hashlib
- os
Example:
>>> salt, hashed_password = task_func('my_password')
>>> isinstance(salt, bytes)
True
>>> isinstance(hashed_password, bytes)
True
"""
if password is None or password == "":
raise ValueError("Password cannot be None or empty")
# Generate a random salt
salt = os.urandom(SALT_LENGTH)
# Derive a key using PBKDF2-HMAC-SHA256
# 100,000 iterations is a standard recommendation for security
hashed_password = hashlib.pbkdf2_hmac(
'sha256',
password.encode('utf-8'),
salt,
100000
)
# Encode salt and hashed password to base64
salt_b64 = base64.b64encode(salt)
hashed_password_b64 = base64.b64encode(hashed_password)
return salt_b64, hashed_password_b64
```Test output (stdout)
...... [100%] 6 passed in 0.11s