ius/rsatool

ius/rsatool has 1,683 GitHub stars and 273 forks. GitHot measured +1 stars in 24 hours. Last checked 2026-11-08 02:33 UTC. Last push 2026-07-20.

rsatool can be used to calculate RSA and RSA-CRT parameters

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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.

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