rsatool can be used to calculate RSA and RSA-CRT parameters
Python
Latest commit d902bec Nov 18, 2016 @ius committed on GitHub Merge pull request #6 from enricobacis/master
Correct Euler's totient function in all cases

README.md

Description

rsatool calculates RSA (p, q, n, d, e) and RSA-CRT (dP, dQ, qInv) parameters given either two primes (p, q) or modulus and private exponent (n, d).

Resulting parameters are displayed and can optionally be written as an OpenSSL compatible DER or PEM encoded RSA private key.

Requirements

Usage examples

Supplying modulus and private exponent, PEM output to key.pem:

python rsatool.py -f PEM -o key.pem -n 13826123222358393307 -d 9793706120266356337

Supplying two primes, DER output to key.der:

python rsatool.py -f DER -o key.der -p 4184799299 -q 3303891593