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SSCG - Simple Signed Certificate Generator

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x509 Certificates are complicated to get right. SSCG makes it easy to generate usable, signed certificates quickly without needing to understand complex openssl, certtool or certutil commands.

Quick Usage - Certificates Signed by a Private CA


This will produce a ca.crt and a pair of service.pem and service-key.pem files in the current directory, the latter of which is signed by the private key of the ca.crt. The CA's private key will be destroyed by default after these files are created, so nothing further can be signed by it. (See this blog post for details on why this is desirable.)

Certificates generated by SSCG will be valid by default for securing the current machine's hostname and no others. To add further names (such as for a multi-homed system), look at the --subject-alt-name argument below.

Full Usage

Usage of sscg:

Usage: sscg [OPTION...]
  -q, --quiet                                           Display no output unless there is an error.
  -v, --verbose                                         Display progress messages.
  -d, --debug                                           Enable logging of debug messages. Implies verbose. Warning! This will print
                                                        private key information to the screen!
  -V, --version                                         Display the version number and exit.
  -f, --force                                           Overwrite any pre-existing files in the requested locations
      --lifetime=1-3650                                 Certificate lifetime (days). (default: 3650)
      --country=US, CZ, etc.                            Certificate DN: Country (C). (default: "US")
      --state=Massachusetts, British Columbia, etc.     Certificate DN: State or Province (ST).
      --locality=Westford, Paris, etc.                  Certificate DN: Locality (L).
      --organization=My Company                         Certificate DN: Organization (O). (default: "Unspecified")
      --organizational-unit=Engineering, etc.           Certificate DN: Organizational Unit (OU).                        Certificate DN: Email Address (Email).                     The valid hostname of the certificate. Must be an FQDN. (default: current
                                                        system FQDN)
      --subject-alt-name                Optional additional valid hostnames for the certificate. In addition to
                                                        hostnames, this option also accepts explicit values supported by RFC 5280 such
                                                        as May be specified multiple times.
      --package=STRING                                  Unused. Retained for compatibility with earlier versions of sscg.
      --key-strength=2048 or larger                     Strength of the certificate private keys in bits. (default: 2048)
      --hash-alg={sha256,sha384,sha512}                 Hashing algorithm to use for signing. (default: "sha256")
      --ca-file=STRING                                  Path where the public CA certificate will be stored. (default: "./ca.crt")
      --ca-mode=0644                                    File mode of the created CA certificate. (default: 0644)
      --ca-key-file=STRING                              Path where the CA's private key will be stored. If unspecified, the key will
                                                        be destroyed rather than written to the disk.
      --ca-key-mode=0600                                File mode of the created CA key. (default: 0600)
      --cert-file=STRING                                Path where the public service certificate will be stored. (default
      --cert-mode=0644                                  File mode of the created certificate. (default: 0644)
      --cert-key-file=STRING                            Path where the service's private key will be stored. (default
      --cert-key-mode=0600                              File mode of the created certificate key. (default: 0600)

Help options:
  -?, --help                                            Show this help message
      --usage                                           Display brief usage message

For developers, you can run with the environment variable SSCG_TALLOC_REPORT=true to get a memory leak report.

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