Clamav 0.98 checks signed PE files for certificates and verifies each certificate in the chain against a database of trusted and revoked certificates. The signature format is
Name;Trusted;Subject;Serial;Pubkey;Exponent;CodeSign;TimeSign;CertSign;
NotBefore;Comment[;minFL[;maxFL]]
where the corresponding fields are:
Name: name of the entry
Trusted: bit field, specifying whether the cert is trusted. 1 for trusted. 0 for revoked
Subject: sha1 of the Subject field in hex
Serial: the serial number as clamscan –debug –verbose reports
Pubkey: the public key in hex
Exponent: the exponent in hex. Currently ignored and hardcoded to 010001 (in hex)
CodeSign: bit field, specifying whether this cert can sign code. 1 for true, 0 for false
TimeSign: bit field. 1 for true, 0 for false
CertSign: bit field, specifying whether this cert can sign other certs. 1 for true, 0 for false
NotBefore: integer, cert should not be added before this variable. Defaults to 0 if left empty
Comment: comments for this entry
The signatures for certs are stored inside .crb files.