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Date: Mon, 24 Mar 2014 20:45:08 +0530
Subject: TypeError in HMAC module.
From: Prabir Kr Sarkar <prabir.kr.sarkar@gmail.com>
To: python-list@python.org
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Hi,
   I am trying to create a hashed message for authentication for a REST API
call. I have got the key from a keyring as :-

key = keyring.get_password('AWS_keyring','username')

& calculating the signature as :-
signature = hmac(key, message.encode('UTF-8'),
hashlib.sha1).digest().encode('base64')[:-1]

But, while running the script I get the following errors :-

  File "/usr/lib64/python2.6/hmac.py", line 133, in new
    return HMAC(key, msg, digestmod)
  File "/usr/lib64/python2.6/hmac.py", line 72, in __init__
*    self.outer.update(key.translate(trans_5C))*
*TypeError: character mapping must return integer, None or unicode*

My python version is :-

# python -V
Python 2.6.9

Can someone please help me as to how I can resolve this issue. Thanks in
advance.

-- 
*Thanks and Regards*
*Prabir Sarkar*

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<div dir=3D"ltr"><div>Hi,</div><div>=A0 =A0I am trying to create a hashed m=
essage for authentication for a REST API call. I have got the key from a ke=
yring as :-</div><div><br></div><div>key =3D keyring.get_password(&#39;AWS_=
keyring&#39;,&#39;username&#39;)<br>
</div><div><br></div><div>&amp; calculating the signature as :-</div><div>s=
ignature =3D hmac(key, message.encode(&#39;UTF-8&#39;), hashlib.sha1).diges=
t().encode(&#39;base64&#39;)[:-1]<br></div>
<div><br></div><div>But, while running the script I get the following error=
s :-</div><div><br></div><div>=A0 File &quot;/usr/lib64/python2.6/hmac.py&q=
uot;, line 133, in new</div><div>=A0 =A0 return HMAC(key, msg, digestmod)</=
div>
<div>=A0 File &quot;/usr/lib64/python2.6/hmac.py&quot;, line 72, in __init_=
_</div><div><b>=A0 =A0 self.outer.update(key.translate(trans_5C))</b></div>
<div><b>TypeError: character mapping must return integer, None or unicode</=
b></div><div><br></div><div>My python version is :-</div><div><br></div><di=
v><div># python -V</div><div>Python 2.6.9</div></div><div><br></div><div>
Can someone please help me as to how I can resolve this issue. Thanks in ad=
vance.</div><div><br></div>-- <br><div dir=3D"ltr"><div><b>Thanks and Regar=
ds</b></div><div><b>Prabir Sarkar</b></div><div><br></div></div>
</div>

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