How to digitally sign a message with M2Crypto using the keys within a DER format certificate
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by Pablo Santos
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Published on 2010-03-08T13:00:56Z
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2010/03/08
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Hi everyone.
I am working on a project to implement digital signatures of outgoing messages and decided to use M2Crypto for that.
I have a certificate (in DER format) from which I extract the keys to sign the message. For some reason I keep getting an ugly segmentation fault error when I call the "sign_update" method.
Given the previous examples I have read here, I am clearly missing something.
Here is the example I am working on:
from M2Crypto.X509 import *
cert = load_cert( 'certificate.cer', format=0 )
Pub_key = cert.get_pubkey()
Pub_key.reset_context(md='sha1')
Pub_key.sign_init()
Pub_key.sign_update( "This should be good." )
print Pub_key.sign_final()
Thanks in advance for the help,
Pablo
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