openssl-prime

Check if number is prime

$ openssl prime [number]

$ openssl prime -hex [hex-number]

$ openssl prime -generate -bits [256]

$ openssl prime -generate -bits [256] -safe

openssl prime [options] [number]

openssl prime tests numbers for primality or generates prime numbers. Uses Miller-Rabin primality testing. Useful for cryptographic applications requiring prime numbers.

-hex

Input/output in hexadecimal.

Generate a prime number.

Number of bits for generation.

Generate safe prime (p where (p-1)/2 is also prime).

Number of Miller-Rabin tests.

openssl(1)