Provided by: gnutls-bin_3.0.11+really2.12.14-5ubuntu3_amd64 bug


       certtool - Manipulate certificates and keys.


       certtool [options]


       Generate X.509 certificates, certificate requests, and private keys.


   Program control options
       -d, --debug LEVEL
              Specify the debug level. Default is 1.

       -h, --help
              Shows this help text

       -v, --version
              Shows the program's version

   Getting information on X.509 certificates
       -i, --certificate-info
              Print information on a certificate.

       -k, --key-info
              Print information on a private key.

       -l, --crl-info
              Print information on a CRL.

              Print information on a PKCS #12 structure.

   Getting information on Openpgp certificates
              Print information on an OpenPGP certificate.

              Print information on an OpenPGP private key.

              Print information on a keyring.

   Generating/verifying X.509 certificates/keys
       -c, --generate-certificate
              Generate a signed certificate.

       -e, --verify-chain
              Verify  a PEM encoded certificate chain.  The last certificate in the chain must be
              a self signed one.

              Generate PKCS #3 encoded Diffie-Hellman parameters.

       --load-ca-certificate FILE
              Certificate authority's certificate file to use.

       --load-ca-privkey FILE
              Certificate authority's private key file or PKCS #11 URL to use.

       --load-certificate FILE
              Certificate file to use.

       --load-privkey FILE
              Private key file  or PKCS #11 URL to use.

       --load-pubkey FILE
              Public key file  or PKCS #11 URL to use.

       --load-request FILE
              Certificate request file to use.

       -p, --generate-privkey
              Generate a private key.

       -q, --generate-request
              Generate a PKCS #10 certificate request.

       -s, --generate-self-signed
              Generate a self-signed certificate.

       -u, --update-certificate
              Update a signed certificate.

   Controlling output
       -8, --pkcs8
              Use PKCS #8 format for private keys.

              The   cipher   to   use   when   doing   pkcs   encryption.   Valid   options   are

       --dsa  Generate a DSA key.

       --bits BITS
              Specify the number of bits for key generation.

              Use weak encryption algorithms.

              Use RAW/DER format for input certificates and private keys.

       --infile FILE
              Input file.

              Use RAW/DER format for output certificates and private keys.

       --outfile FILE
              Output file.

       --password PASSWORD
              Password to use.

              Generate a PKCS #12 structure.

              Use  a  template  file to read input. See the doc/certtool.cfg in the distribution,
              for an example.

              Some previous versions of certtool generated wrongly the optional parameters  in  a
              private key. This may affect programs that used them. To fix an old private key use
              --key-info in combination with this parameter.

       --v1   When generating a certificate use the X.509 version 1 format.  This  does  not  add
              any extensions (such as indication for a CA) but some programs do need these.


       To create a private key, run:

              $ certtool --generate-privkey --outfile key.pem

       To  create a certificate request (needed when the certificate is issued by another party),

              $ certtool --generate-request --load-privkey key.pem \
                 --outfile request.pem

       To create a certificate request using a key stored in a PKCS #11 token, run:

              $ ./certtool --generate-request --load-privkey "pkcs11:..." \
                --load-pubkey "pkcs11:..." --outfile request.pem

       To generate a certificate using the previous request, use the command:

              $ certtool --generate-certificate --load-request request.pem \
                 --outfile cert.pem --load-ca-certificate ca-cert.pem \
                 --load-ca-privkey ca-key.pem

       To generate a certificate using the private key only, use the command:

              $ certtool --generate-certificate --load-privkey key.pem \
                 --outfile cert.pem --load-ca-certificate ca-cert.pem \
                 --load-ca-privkey ca-key.pem

       To view the certificate information, use:

              $ certtool --certificate-info --infile cert.pem

       To generate a PKCS #12 structure using the previous key and certificate, use the command:

              $ certtool --load-certificate cert.pem --load-privkey key.pem \
                 --to-p12 --outder --outfile key.p12


       Nikos       Mavrogiannopoulos       <>        and        others;        see
       /usr/share/doc/gnutls-bin/AUTHORS for a complete list.

       This  manual page was written by Ivo Timmermans <>, for the Debian GNU/Linux
       system (but may be used by others).

                                          May 23rd 2005                               certtool(1)