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()

在我自己的计算机上运行完美（具有python 2.6.1）。但是，当我在我的服务器上运行此代码（Python 2.4.3）时，我得到以下内容：

 /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'",)

我知道明显的反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它需要多长时间。我很好奇这是否是2.4.3上的常见/已知问题，或者是否还有其他问题。

由于

Answer 1

hashlib是2.5中的新功能。对于旧版本的Python，您需要backport。

Answer 2

这是一个让hashlib backport与python 2.4上的hmac一起工作的黑客攻击：

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()

Python hashlib.sha256的问题（2.4.3）

2 个答案: