为什么我在Python中得到错误的hmac结果而不是Perl？

我正在尝试使用sha-512来计算hmac.

Perl代码:

use Digest::SHA qw(hmac_sha512_hex);

$key = "\x0b"x20;
$data = "Hi There";

$hash = hmac_sha512_hex($data, $key);
print "$hash\n";

并给出正确的哈希值

87aa7cdea5ef619d4ff0b4241a1d6cb02379f4e2ce4ec2787ad0b30545e17cde  
daa833b7d6b8a702038b274eaea3f4e4be9d914eeb61f1702e696c203a126854

Python版本:

import hashlib, hmac

print hmac.new("\x0b"*20, "Hi There", hashlib.sha512).hexdigest()

它给出了错误的哈希值

9656975ee5de55e75f2976ecce9a04501060b9dc22a6eda2eaef638966280182
477fe09f080b2bf564649cad42af8607a2bd8d02979df3a980f15e2326a0a22a

任何想法为什么Python版本给我错误的哈希？

编辑:
版本是
darwin的Python 2.5.1(r251:54863,2009年1月13日,10:26:13)
[GCC 4.0.1(Apple Inc. build 5465)]

确实如此 - 似乎python2.5的Leopard版本是破坏的版本.

以下基于Penryn的MBP运行...

$ **uname -a**
Darwin lizard-wifi 9.6.0 Darwin Kernel Version 9.6.0: Mon Nov 24 17:37:00 PST 2008; root:xnu-1228.9.59~1/RELEASE_I386 i386
dpc@lizard-wifi:~$ **which python**
/usr/bin/python

在Leopard OS中运行此版本

dpc@lizard-wifi:~$ python
Python 2.5.1 (r251:54863, Jan 13 2009, 10:26:13) 
[GCC 4.0.1 (Apple Inc. build 5465)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import hashlib, hmac
>>> print hmac.new("\x0b"*20, "Hi There", hashlib.sha512).hexdigest()
9656975ee5de55e75f2976ecce9a04501060b9dc22a6eda2eaef638966280182477fe09f080b2bf564649cad42af8607a2bd8d02979df3a980f15e2326a0a22a
>>> 

然后是MacPorts版本 python2.5

$ /opt/local/bin/python2.5
Python 2.5.4 (r254:67916, Feb  3 2009, 21:40:31) 
[GCC 4.0.1 (Apple Inc. build 5488)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import hashlib, hmac
>>> print hmac.new("\x0b"*20, "Hi There", hashlib.sha512).hexdigest()
87aa7cdea5ef619d4ff0b4241a1d6cb02379f4e2ce4ec2787ad0b30545e17cdedaa833b7d6b8a702038b274eaea3f4e4be9d914eeb61f1702e696c203a126854
>>>