- NAME
- SYNOPSIS
- DESCRIPTION
- OPTIONS
- COPYRIGHT

# NAME

openssl-prime - compute prime numbers

# SYNOPSIS

openssl prime [-help] [-hex] [-in] [-generate] [-bits num] [-safe] [-provider name] [-provider-path path] [-provparam [name:]key=value] [-propquery propq] [-checks num] [number ...]

# DESCRIPTION

This command checks if the specified numbers are prime.

If no numbers are given on the command line, the -generate flag should be used to generate primes according to the requirements specified by the rest of the flags.

# OPTIONS

-help

  Display an option summary.

-hex

  Enable hex format for output from prime generation or input to primality checking.

-in

  Provide file names containing numbers for primality checking.

-generate

  Generate a prime number.

-bits num

  Generate a prime with num bits.

-safe

  When used with -generate, generates a "safe" prime. If the number generated is n, then check that `(n-1)/2` is also prime.

-provider name
-provider-path path
-provparam [name:]key=value
-propquery propq

  See "Provider Options" in openssl(1), provider(7), and property(7).

-checks num

  This parameter is ignored.

# COPYRIGHT

Copyright 2017-2025 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at https://www.openssl.org/source/license.html.