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<H1>[pycrypto] providing signature in base64</H1>
<B>Cornelius Kölbel</B>
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TITLE="[pycrypto] providing signature in base64">cornelius.koelbel at lsexperts.de
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<I>Wed May 9 11:56:06 EDT 2012</I>
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<PRE>Hi,
i discovered the number.bytes_to_long function, which does the trick,
but the signature validation still fails.
I assume I would have to b64decode my signature prior to converting it.
But it fails :-/
ret = RSAKey.verify(hash, (number.bytes_to_long(sign.decode("base64")),) )
print ret
ret = RSAKey.verify(hash, (number.bytes_to_long(base64.b64decode(sign)),))
print ret
Any hint on that?
The signature was created with openssl/M2Crypto.
And I'd like to mirgate to pycrypto.
Kind regards
Cornelius
Am 09.05.2012 16:28, schrieb Cornelius Kölbel:
><i> Hello,
</I>><i>
</I>><i> I have a signature provided in base64 like this:
</I>><i>
</I>><i> XQgVBkxrmJXqN2+xkJx8dGRecadoLi61vjBTsl+kYibji0pf6ZsxYF2ewniV7pIbtjQxxIridBRtLo9d1Rpq6QvjvuVbVzqqimQeFZnQTp9scSfAbKCtDe1F4lEWCLP6s/6op3jgPpmgd0p5kPaA4iWLM5IjleT7kxgniggBXIky1aMq4L8DtLujcfHNLeJyXpw9TDPg/2KEYZGT1WqiXIeIuYPt7UySOVnmgIoQYstu7C5Vsy5hjzBfhpVvKaPjXEDeETL4UoO2S9H+hu0x932HyyiNTYCpY9VFQnptsVtTkkOvEqhY3xxYix4nzeU+vXc4hFFnhAZMJbPYmuPy5w==
</I>><i>
</I>><i> but I am breaking my head how to pass this to the verify function.
</I>><i>
</I>><i> I create the RSA Object from a PEM encoded public key. This works fine.
</I>><i>
</I>><i> But when I try to unpack the base64 encoded signature, I do not get ONE
</I>><i> long but a tuple with 32 long int.
</I>><i>
</I>><i> long_signature= struct.unpack('Q'*32, sign.decode("base64"))
</I>><i> hash = sha256(licStr).digest()
</I>><i> RSAKey = RSA.importKey(public)
</I>><i> ret = RSAKey.verify(hash, long_signature)
</I>><i>
</I>><i> I know that this is more a matter of how to handle the unpack function,
</I>><i> but did not find anything about this.
</I>><i>
</I>><i> Thanks a lot and kind regards
</I>><i> Cornelius
</I>
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