# Copyright (C) 2005 Gregory P. Smith (greg@krypto.org)
# Licensed to PSF under a Contributor Agreement.
__doc__ = """hashlib module - A common interface to many hash functions.
new(name, string='', usedforsecurity=True)
- returns a new hash object implementing the given hash function;
initializing the hash using the given string data.
"usedforsecurity" is a non-standard extension for better supporting
FIPS-compliant environments (see below)
Named constructor functions are also available, these are much faster
md5(), sha1(), sha224(), sha256(), sha384(), and sha512()
More algorithms may be available on your platform but the above are guaranteed
to exist. See the algorithms_guaranteed and algorithms_available attributes
to find out what algorithm names can be passed to new().
NOTE: If you want the adler32 or crc32 hash functions they are available in
Choose your hash function wisely. Some have known collision weaknesses.
sha384 and sha512 will be slow on 32 bit platforms.
Our implementation of hashlib uses OpenSSL.
OpenSSL has a "FIPS mode", which, if enabled, may restrict the available hashes
to only those that are compliant with FIPS regulations. For example, it may
deny the use of MD5, on the grounds that this is not secure for uses such as
authentication, system integrity checking, or digital signatures.
If you need to use such a hash for non-security purposes (such as indexing into
a data structure for speed), you can override the keyword argument
"usedforsecurity" from True to False to signify that your code is not relying
on the hash for security purposes, and this will allow the hash to be usable
even in FIPS mode. This is not a standard feature of Python 2.7's hashlib, and
is included here to better support FIPS mode.
Hash objects have these methods:
- update(arg): Update the hash object with the string arg. Repeated calls
are equivalent to a single call with the concatenation of all
- digest(): Return the digest of the strings passed to the update() method
so far. This may contain non-ASCII characters, including
- hexdigest(): Like digest() except the digest is returned as a string of
double length, containing only hexadecimal digits.
- copy(): Return a copy (clone) of the hash object. This can be used to
efficiently compute the digests of strings that share a common
For example, to obtain the digest of the string 'Nobody inspects the
>>> m.update("Nobody inspects")
>>> m.update(" the spammish repetition")
'\\xbbd\\x9c\\x83\\xdd\\x1e\\xa5\\xc9\\xd9\\xde\\xc9\\xa1\\x8d\\xf0\\xff\\xe9'
>>> hashlib.sha224("Nobody inspects the spammish repetition").hexdigest()
'a4337bc45a8fc544c03f52dc550cd6e1e87021bc896588bd79e901e2'
# This tuple and __get_builtin_constructor() must be modified if a new
# always available algorithm is added.
__always_supported = ('md5', 'sha1', 'sha224', 'sha256', 'sha384', 'sha512')
algorithms_guaranteed = set(__always_supported)
algorithms_available = set(__always_supported)
algorithms = __always_supported
__all__ = __always_supported + ('new', 'algorithms_guaranteed',
'algorithms_available', 'algorithms',
def __get_openssl_constructor(name):
f = getattr(_hashlib, 'openssl_' + name)
# Allow the C module to raise ValueError. The function will be
# defined but the hash not actually available thanks to OpenSSL.
# We pass "usedforsecurity=False" to disable FIPS-based restrictions:
# at this stage we're merely seeing if the function is callable,
# rather than using it for actual work.
# Use the C function directly (very fast)
except (AttributeError, ValueError):
# RHEL only: Fallbacks removed; we always use OpenSSL for hashes.
def __hash_new(name, string='', usedforsecurity=True):
"""new(name, string='', usedforsecurity=True) - Return a new hashing object
using the named algorithm; optionally initialized with a string.
Override 'usedforsecurity' to False when using for non-security purposes in
return _hashlib.new(name, string, usedforsecurity)
# RHEL only: Fallbacks removed; we always use OpenSSL for hashes.
__get_hash = __get_openssl_constructor
algorithms_available = algorithms_available.union(
_hashlib.openssl_md_meth_names)
__get_hash = __get_builtin_constructor
for __func_name in __always_supported:
# try them all, some may not work due to the OpenSSL
# version not supporting that algorithm.
globals()[__func_name] = __get_hash(__func_name)
logging.exception('code for hash %s was not found.', __func_name)
# OpenSSL's PKCS5_PBKDF2_HMAC requires OpenSSL 1.0+ with HMAC and SHA
from _hashlib import pbkdf2_hmac
_trans_5C = b"".join(chr(x ^ 0x5C) for x in range(256))
_trans_36 = b"".join(chr(x ^ 0x36) for x in range(256))
def pbkdf2_hmac(hash_name, password, salt, iterations, dklen=None):
"""Password based key derivation function 2 (PKCS #5 v2.0)
This Python implementations based on the hmac module about as fast
as OpenSSL's PKCS5_PBKDF2_HMAC for short passwords and much faster
if not isinstance(hash_name, str):
raise TypeError(hash_name)
if not isinstance(password, (bytes, bytearray)):
password = bytes(buffer(password))
if not isinstance(salt, (bytes, bytearray)):
salt = bytes(buffer(salt))
# Fast inline HMAC implementation
blocksize = getattr(inner, 'block_size', 64)
if len(password) > blocksize:
password = new(hash_name, password).digest()
password = password + b'\x00' * (blocksize - len(password))
inner.update(password.translate(_trans_36))
outer.update(password.translate(_trans_5C))
def prf(msg, inner=inner, outer=outer):
# PBKDF2_HMAC uses the password as key. We can re-use the same
# digest objects and just update copies to skip initialization.
ocpy.update(icpy.digest())
raise ValueError(iterations)
dklen = outer.digest_size
hex_format_string = "%%0%ix" % (new(hash_name).digest_size * 2)
prev = prf(salt + struct.pack(b'>I', loop))
rkey = int(binascii.hexlify(prev), 16)
for i in xrange(iterations - 1):
rkey ^= int(binascii.hexlify(prev), 16)
dkey += binascii.unhexlify(hex_format_string % rkey)
del __always_supported, __func_name, __get_hash
del __hash_new, __get_openssl_constructor
It is recommended that you Edit text format, this type of Fix handles quite a lot in one request
