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Choose your hash function wisely. Some have known collision weaknesses. sha384 and sha512 will be slow on 32 bit platforms. If the underlying implementation supports "FIPS mode", and this is enabled, it 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. Hash objects have these methods: - update(arg): Update the hash object with the bytes in arg. Repeated calls are equivalent to a single call with the concatenation of all the arguments. - digest(): Return the digest of the bytes passed to the update() method so far. - hexdigest(): Like digest() except the digest is returned as a unicode object 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 initial substring. For example, to obtain the digest of the string 'Nobody inspects the spammish repetition': >>> import hashlib >>> m = hashlib.md5() >>> m.update(b"Nobody inspects") >>> m.update(b" the spammish repetition") >>> m.digest() b'\xbbd\x9c\x83\xdd\x1e\xa5\xc9\xd9\xde\xc9\xa1\x8d\xf0\xff\xe9' More condensed: >>> hashlib.sha224(b"Nobody inspects the spammish repetition").hexdigest() 'a4337bc45a8fc544c03f52dc550cd6e1e87021bc896588bd79e901e2' �md5�sha1�sha224�sha256�sha384�sha512�new�algorithms_guaranteed�algorithms_available� pbkdf2_hmac� Nc s% t j � � � f d d � � } | S)z�Used for sha3_* functions. Until OpenSSL implements them, we want to use them from Python _sha3 module, but we want them to accept usedforsecurity argument too.c s) d | k r | j d � n � | | � S)N�usedforsecurity)�pop)�args�kwargs)�func� �,/opt/alt/python34/lib64/python3.4/hashlib.py�innerQ s z'__ignore_usedforsecurity.<locals>.inner)� functools�wraps)r r r )r r �__ignore_usedforsecurityL s !r c C s[ t } | j | � } | d k r% | Sy� | d k rX d d l } | j | d <| d <n� | d k r� d d l } | j | d <| d <n� | d k r� d d l } | j | d <| d <| j | d <| d <nE | d k rd d l } | j | d <| d <| j | d <| d <n Wn t k r'Yn X| j | � } | d k rG| St d | � � d S)N�SHA1r r �MD5r �SHA256r �SHA224r �SHA512r �SHA384r zunsupported hash type )r zsha1)r zmd5)r zsha256r zsha224)r zsha512r zsha384)�__builtin_constructor_cache�get�_sha1r �_md5r �_sha256r r �_sha512r r � ImportError� ValueError)�name�cache� constructorr r r! r" r r r �__get_builtin_constructor[ s2 r( c C sQ y( t t d | � } | d d � | SWn" t t f k rL t | � SYn Xd S)NZopenssl_r F)�getattr�_hashlib�AttributeErrorr$ r( )r% �fr r r �__get_openssl_constructory s r- � Tc C s t | � | � S)a new(name, data=b'', usedforsecurity=True) - Return a new hashing object using the named algorithm; optionally initialized with data (which must be bytes). The 'usedforsecurity' keyword argument does nothing, and is for compatibilty with the OpenSSL implementation )r( )r% �datar r r r �__py_new� s r0 c C s@ y t j | | | � SWn" t k r; t | � | � SYn Xd S)a new(name, data=b'', usedforsecurity=True) - Return a new hashing object using the named algorithm; optionally initialized with data (which must be bytes). Override 'usedforsecurity' to False when using for non-security purposes in a FIPS environment N)r* r r$ r( )r% r/ r r r r � __hash_new� s r1 )r c c s | ] } | d AVq d S)�\ Nr )�.0�xr r r � <genexpr>� s r5 � c c s | ] } | d AVq d S)�6 Nr )r3 r4 r r r r5 � s c C s1 t | t � s t | � � n t | t t f � sH t t | � � } n t | t t f � sr t t | � � } n t | � } t | � } t | d d � } t | � | k r� t | | � j � } n | d | t | � } | j | j t � � | j | j t � � | | d d � } | d k r7t | � � n | d k rO| j } n | d k rjt | � � n d } d } t j } x� t | � | k r"| | | j d d � � } t j | d � } x7 t | d � D]% } | | � } | | | d � N} q�W| d 7} | | j | j d � 7} q�W| d | � S) z�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 for long passwords. Z block_size�@ s c S sB | j � } | j � } | j | � | j | j � � | j � S)N)�copy�update�digest)�msgr �outerZicpyZocpyr r r �prf� s zpbkdf2_hmac.<locals>.prf� Nr. � Zbig)� isinstance�str� TypeError�bytes� bytearray� memoryviewr r) �lenr; r: � translate� _trans_36� _trans_5Cr$ Z digest_size�int� from_bytes�to_bytes�range)Z hash_nameZpasswordZsaltZ iterationsZdklenr r= Z blocksizer> ZdkeyZlooprL �prevZrkey�ir r r r � sB Zsha3_z code for hash %s was not found.)zmd5zsha1zsha224zsha256zsha384zsha512)znewzalgorithms_guaranteedzalgorithms_availablez pbkdf2_hmac) �__doc__Z__always_supported�setr r �__all__r r r r( r- r0 r1 r* r Z __get_hash�unionZopenssl_md_meth_namesr# r rD rN rJ rI Z __func_namer �globalsr$ ZloggingZ exceptionr r r r �<module>? sN :
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