# pdfsig(1) - man - phpman [pdfsig(1)](https://www.chedong.com/phpMan.php/man/pdfsig/1/markdown) General Commands Manual [pdfsig(1)](https://www.chedong.com/phpMan.php/man/pdfsig/1/markdown) ## NAME pdfsig - Portable Document Format (PDF) digital signatures tool ## SYNOPSIS **pdfsig** [options] [_PDF-file_] [_Output-file_] ## DESCRIPTION **pdfsig** verifies the digital signatures in a PDF document. It also displays the identity of each signer (commonName field and full distinguished name of the signer certificate), the time and date of the signature, the hash algorithm used for signing, the type of the signa‐ ture as stated in the PDF and the signed ranges with a statement wether the total document is signed. It can also sign PDF documents (options -add-signature or -sign). pdfsig uses the trusted certificates stored in the Network Security Services (NSS) Database. pdfsig also uses the Online Certificate Status Protocol (OCSP) (refer to ) to look up the certificate online and check if it has been revoked (unless -no-ocsp has been specified). The NSS Database is searched for in the following locations: • If the -nssdir option is specified, the directory specified by this option. • The NSS Certificate database in the default Firefox profile. i.e. $HOME/.mozilla/fire‐ fox/*.default. • The NSS Certificate database in /etc/pki/nssdb. ## OPTIONS ### -nssdir [prefix]directory Specify the database directory containing the certificate and key database files. See [certutil(1)](https://www.chedong.com/phpMan.php/man/certutil/1/markdown) -d option for details of the prefix. If not specified the other search lo‐ cations described in **DESCRIPTION** are used. ### -nss-pwd password Specify the password needed to access the NSS database (if any). ### -nocert Do not validate the certificate. ### -no-ocsp Do not perform online OCSP certificate revocation check (local Certificate Revocation Lists (CRL) are still used). ### -aia tificates to build the certificate chain. ### -dump ### -add-signature Add a new signature to the document. ### -new-signature-field-name name Specifies the field name to be used when adding a new signature. A random ID will be used by default. ### -sign n Sign the document in the n-th signature field present in the document (must be un‐ signed). ### -nick nickname Use the certificate with the given nickname for signing. ### -kpw password Use the given password for the signing key (this might be missing if the key isn't password protected). ### -digest algorithm Use the given digest algorithm for signing (default: SHA256). ### -reason reason Set the given reason string for the signature (default: no reason set). ### -etsi ### -list-nicks List available nicknames in the NSS database. ### -v ### -h -help --help ## EXAMPLES pdfsig signed_file.pdf Displays signature info for signed_file.pdf. pdfsig input.pdf output.pdf -add-signature -nss-pwd password -nick my-cert -reason 'for fun!' Creates a new pdf named output.pdf with the contents of input.pdf signed by the 'my- cert' certificate. pdfsig input.pdf output.pdf -sign 0 -nss-pwd password -nick my-cert -reason 'for fun!' Creates a new pdf named output.pdf with the contents of input.pdf signed by the 'my- cert' certificate. input.pdf must have an already existing un-signed signature field. ## AUTHOR The pdfsig software and documentation are copyright 1996-2004 Glyph & Cog, LLC and copyright 2005-2015 The Poppler Developers - ## SEE ALSO [**pdfdetach**(1)](https://www.chedong.com/phpMan.php/man/pdfdetach/1/markdown), [**pdffonts**(1)](https://www.chedong.com/phpMan.php/man/pdffonts/1/markdown), [**pdfimages**(1)](https://www.chedong.com/phpMan.php/man/pdfimages/1/markdown), [**pdfinfo**(1)](https://www.chedong.com/phpMan.php/man/pdfinfo/1/markdown), [**pdftocairo**(1)](https://www.chedong.com/phpMan.php/man/pdftocairo/1/markdown), [**pdftohtml**(1)](https://www.chedong.com/phpMan.php/man/pdftohtml/1/markdown), [**pdftoppm**(1)](https://www.chedong.com/phpMan.php/man/pdftoppm/1/markdown), [**pdftops**(1)](https://www.chedong.com/phpMan.php/man/pdftops/1/markdown), [**pdftotext**(1)](https://www.chedong.com/phpMan.php/man/pdftotext/1/markdown) [**pdfseparate**(1)](https://www.chedong.com/phpMan.php/man/pdfseparate/1/markdown), [**pdfunite**(1)](https://www.chedong.com/phpMan.php/man/pdfunite/1/markdown) [**certutil**(1)](https://www.chedong.com/phpMan.php/man/certutil/1/markdown) 28 October 2015 [pdfsig(1)](https://www.chedong.com/phpMan.php/man/pdfsig/1/markdown)