hash.py 文件源码

def _setup():
    global _hashes
    _hashes = {}
    try:
        import hashlib
        _hashes['MD5'] = hashlib.md5
        _hashes['SHA1'] = hashlib.sha1
        _hashes['SHA224'] = hashlib.sha224
        _hashes['SHA256'] = hashlib.sha256
        if sys.hexversion >= 0x02050200:
            _hashes['SHA384'] = hashlib.sha384
            _hashes['SHA512'] = hashlib.sha512
        else:
            _hashes['SHA384'] = _need_later_python('SHA384')
            _hashes['SHA512'] = _need_later_python('SHA512')

        if sys.hexversion < 0x02050000:
            # hashlib doesn't conform to PEP 247: API for
            # Cryptographic Hash Functions, which hmac before python
            # 2.5 requires, so add the necessary items.
            class HashlibWrapper:
                def __init__(self, basehash):
                    self.basehash = basehash
                    self.digest_size = self.basehash().digest_size

                def new(self, *args, **kwargs):
                    return self.basehash(*args, **kwargs)

            for name in _hashes:
                _hashes[name] = HashlibWrapper(_hashes[name])

    except ImportError:
        import md5, sha
        _hashes['MD5'] =  md5
        _hashes['SHA1'] = sha