Python hashlib.sha256 的问题 (2.4.3)

Question

所以我有一些代码：

signature = hmac.new(
    key=AWS_SECRET_ACCESS_KEY,
    msg=string_to_sign,
    digestmod=hashlib.sha256).digest()

它在我自己的计算机上完美运行（有 python 2.6.1）。但是，当我在我的服务器（Python 2.4.3）上运行此代码时，我得到以下信息：

 /home/MYUSERNAME/public_html/Foo.com/cgi-bin/foo.py
   66     key=AWS_SECRET_ACCESS_KEY,
   67     msg=string_to_sign,
   68     digestmod=hashlib.sha1).digest()
   69  
   70 # Base64 encode the signature
digestmod = <built-in function openssl_sha256>, hashlib = <module 'hashlib' from '/usr/lib/python2.4/site-...shlib-20081119-py2.4-linux-i686.egg/hashlib.pyc'>, hashlib.sha1 = <built-in function openssl_sha1>, ).digest undefined
 /usr/lib/python2.4/hmac.py in new(key='xR6MsC/+Vc2xkd0YYbER0meR/IkWEU', msg='GET\necs.amazonaws.com\n/onca/xml\nAWSAccessKeyId=A...CommerceService&Timestamp=2010-07-03T18%3A56%3A48', digestmod=<built-in function openssl_sha1>)
  103     You can now feed arbitrary strings into the object using its update()
  104     method, and can ask for the hash value at any time by calling its digest()
  105     method.
  106     """
  107     return HMAC(key, msg, digestmod)
global HMAC = <class hmac.HMAC>, key = 'xR6MsC/+Vc2xkd0YYbER0meR/IkWEU', msg = 'GET\necs.amazonaws.com\n/onca/xml\nAWSAccessKeyId=A...CommerceService&Timestamp=2010-07-03T18%3A56%3A48', digestmod = <built-in function openssl_sha1>
 /usr/lib/python2.4/hmac.py in __init__(self=<hmac.HMAC instance>, key='xR6MsC/+Vc2xkd0YYbER0meR/IkWEU', msg='GET\necs.amazonaws.com\n/onca/xml\nAWSAccessKeyId=A...CommerceService&Timestamp=2010-07-03T18%3A56%3A48', digestmod=<built-in function openssl_sha1>)
   40 
   41         self.digestmod = digestmod
   42         self.outer = digestmod.new()
   43         self.inner = digestmod.new()
   44         self.digest_size = digestmod.digest_size
self = <hmac.HMAC instance>, self.outer undefined, digestmod = <built-in function openssl_sha1>, digestmod.new undefined

AttributeError: 'builtin_function_or_method' object has no attribute 'new'
      args = ("'builtin_function_or_method' object has no attribute 'new'",) 

我知道明显的响应是在我的服务器上更新 Python，但我的主机必须这样做，而且我不知道需要多长时间需要的。我只是好奇这是否是 2.4.3 上的常见/已知问题或者是否发生了其他问题。

谢谢

Answer 1

hashlib 是 2.5 中的新增内容。对于旧版本的 Python，您需要向后移植。

Answer 2

这是一个让 hashlib backport 在 python 2.4 上与 hmac 一起工作的 hack：

class mysha256:
    digest_size = 32
    def new(self, inp=''):
        return hashlib.sha256(inp)

并像这样使用 hmac：

signature = hmac.new(
    key=AWS_SECRET_ACCESS_KEY,
    msg=string_to_sign,
    digestmod=mysha256()).digest()