Arguments:
ikey -- Duo integration key
skey -- Duo secret key
akey -- Application secret key
username -- Primary-authenticated username
Validate the signed response returned from Duo.
Returns the username of the authenticated user, or '' (empty
string) if secondary authentication was denied.
Arguments:
ikey -- Duo integration key
skey -- Duo secret key
akey -- Application secret key
sig_response -- The signed response POST'ed to the server
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