rsatool
A Python utility that calculates RSA cryptographic parameters and generates OpenSSL-compatible private keys from prime numbers or modulus/exponent pairs.
A Python utility that calculates RSA cryptographic parameters and generates OpenSSL-compatible private keys from prime numbers or modulus/exponent pairs.
Checked October 2026.
rsatool is a Python-based utility that calculates RSA cryptographic parameters including p, q, n, d, e values and RSA-CRT parameters (dP, dQ, qInv).
The tool accepts input in two formats: either two prime numbers (p, q) or a modulus and private exponent (n, d). It then computes the remaining RSA parameters needed for cryptographic operations.
Key features include:
The tool requires Python 3.7 or higher and depends on the pyasn1 and gmpy2 libraries for ASN.1 encoding and mathematical operations respectively.
Output can be saved to files in industry-standard formats, making it compatible with OpenSSL and other cryptographic tools that work with RSA private keys.
No core features are listed for this product yet, so check the vendor's documentation for the full feature list.
No integrations are listed for this product yet. Check the vendor's documentation, or ask the vendor which integrations and APIs it supports.
Common questions about rsatool: features, pricing and alternatives.
rsatool is a product in the Penetration Testing category. It covers Security Tools.
rsatool is free. Download and setup instructions are at https://github.com/ius/rsatool/.
Alternatives to rsatool listed on CybersecTools:
Compare all rsatool alternatives at https://cybersectools.com/alternatives/rsatool
rsatool is available as on-premises software. It is listed for startups, small businesses, mid-market companies and enterprises. It is free.
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