CryptoLyzer is a fast, flexible, and comprehensive server cryptographic protocol (TLS, SSL, SSH, DNSSEC) and related setting (HTTP headers, DNS records) analyzer and fingerprint (JA3, HASSH tag) generator with application programming (API) and command line (CLI) interface.

However the API can provide the most complete functionality, the CLI also strives to be as comprehensive as possible. To do that CLI provides three output formats. The first one for human analysis where the cryptographic algorithm names and the values of key sizes and other security-related settings are colorized according to their security strength using the well-known traffic light rating system. The other two output formats (Output Formats / Markdown, Output Formats / JSON) are machine-readable, however the Markdown format even human-readable and even suitable for generating documentation in different formats (e.g. DOCX, PDF, ...).

The strength of CryptoLyzer compared to its competitors is that it contains a custom implementation of cryptographic protocols (CryptoParser), which are as small as absolutely necessary for the analysis, but as most comprehensive algorithm identifier sets of the cryptographic protocols (CryptoDataHub) as possible. The combination of the two properly makes it possible to check the support of rarely used, deprecated, non-standard, or experimental algorithms and methods that are not yet or have never been supported by the most popular cryptographic algorithms. This way of working leads to the fact that CryptoLyzer can recognize more TLS cipher suites than listed in total on Ciphersuite Info.

pip install cryptolyzer

cryptolyze tls all www.example.com
cryptolyze tls1_2 ciphers www.example.com
cryptolyze ssh2 ciphers www.example.com
cryptolyze http headers www.example.com
cryptolyze dns dnssec example.com

docker run --rm coroner/cryptolyzer tls all www.example.com
docker run --rm coroner/cryptolyzer tls1_2 ciphers www.example.com
docker run --rm coroner/cryptolyzer ssh2 ciphers www.example.com
docker run --rm coroner/cryptolyzer http headers www.example.com
docker run --rm coroner/cryptolyzer dns dnssec example.com

docker run -ti --rm -p 127.0.0.1:4433:4433 coroner/cryptolyzer ja3 generate 127.0.0.1:4433
openssl s_client -connect 127.0.0.1:4433

docker run -ti --rm -p 127.0.0.1:2121:2121 coroner/cryptolyzer ja3 generate ftp://127.0.0.1:2121
openssl s_client -starttls ftp -connect 127.0.0.1:2121

docker run -ti --rm -p 127.0.0.1:2222:4433 coroner/cryptolyzer hassh generate 127.0.0.1:2222
openssl s_client -connect 127.0.0.1:2222

• CPython (2.7, 3.3+)
• PyPy (2.7, 3.5+)

• Linux
• macOS
• Windows

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Detailed documentation is available on the project's Read the Docs site.

The code is available under the terms of Mozilla Public License Version 2.0 (MPL 2.0).

A non-comprehensive, but straightforward description of MPL 2.0 can be found at Choose an open source license website.

• NLnet Foundation and NGI Assure, supports the project part of the Next Generation Internet initiative.
• Icons made by Freepik from Flaticon.