CryptoLyzer is a fast and flexible server cryptographic settings analyzer library for Python with an easy-to-use command line interface with both human-readable (Markdown) and machine-readable (JSON) output. It works with multiple cryptographic protocols (SSL/ TLS, opportunistic TLS, SSH) and analyzes additional security mechanisms (web security related HTTP response header fields, JA3 tag).
The main purpose of creating this application is the fact, that cryptography protocol analysis differs in many aspect from establishing a connection using a cryptographic protocol. Analysis is mostly testing where we trigger special and corner cases of the protocol and we also trying to establish connection with hardly supported, experimental, obsoleted or even deprecated mechanisms or algorithms which are may or may not supported by the latest or any version of an implementation of the cryptographic protocol.
As follows, it is neither a comprehensive nor a secure client/server implementation of any cryptographic protocol. On the one hand analyzer implements only the absolutely necessary parts of the protocol to interact with servers. On the other it may use completely insecure algorithms and mechanisms. It is not designed and contraindicated to use these client/server implementations establishing secure connections. If you are searching for proper cryptographic protocol implementations, there are several existing wrappers and native implementations for Python (eg: M2Crypto, pyOpenSSL, Paramiko, ...).
CryptoLyzer can be installed directly via pip
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.comor can be used via Docker
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.comdocker run -ti --rm -p 127.0.0.1:4433:4433 coroner/cryptolyzer ja3 generate 127.0.0.1:4433
openssl s_client -connect 127.0.0.1:4433or via APT on Debian based systems
apt update && apt install -y gnupg2 curl
echo 'deb https://download.opensuse.org/repositories/home:/pfeiffersz:/cryptolyzer:/dev/Debian_10/ /' >/etc/apt/sources.list.d/cryptolyzer.list
curl -s https://download.opensuse.org/repositories/home:/pfeiffersz:/cryptolyzer:/dev/Debian_10/Release.key | apt-key add -
apt update && apt install -y python3-pkg-resources python3-cryptoparser python3-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.comor via DNF on Fedora based systems
dnf install 'dnf-command(config-manager)'
dnf config-manager --add-repo https://download.opensuse.org/repositories/home:/pfeiffersz:/cryptolyzer:/dev/Fedora_31/
rpm --import http://download.opensuse.org/repositories/home:/pfeiffersz:/cryptolyzer:/dev/Fedora_31/repodata/repomd.xml.key
dnf install python3-urllib3 python3-cryptography cryptoparser cryptolyzerIf you want to setup a development environment, you are in need of pipenv.
git clone https://gitlab.com/coroner/cryptolyzer
cd cryptolyzer
pipenv install --dev
pipenv run python setup.py develop
pipenv shell
cryptolyze -h- Headers (
headers)- generic headers
- caching headers
- security headers
Supported analyzers by cryptographic protocol versions
| Analyzers | SSH 2.0 |
|---|---|
Cipher Suites (ciphers) |
✓ |
Diffie-Hellman parameters (dhparams) |
✓ |
Host Keys (pubkeys) |
✓ |
- transport layer
- application layer
- opportunistic TLS (STARTTLS)
- extensions
Supported analyzers by cryptographic protocol versions
| Analyzers | SSL 2.0 |
SSL 3.0 |
TLS 1.0 |
TLS 1.1 |
TLS 1.2 |
TLS 1.3 |
|---|---|---|---|---|---|---|
Cipher Suites (ciphers) |
✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
X.509 Public Keys (pubkeys) |
✓ | ✓ | ✓ | ✓ | ✓ | ✗ |
X.509 Public Key Request (pubkeyreq) |
n/a | ✓ | ✓ | ✓ | ✓ | ✗ |
Elliptic Curves (curves) |
n/a | n/a | ✓ | ✓ | ✓ | ✓ |
Diffie-Hellman parameters (dhparams) |
n/a | n/a | ✓ | ✓ | ✓ | ✓ |
Extensions (extensions) |
n/a | n/a | n/a | n/a | ✓ | ✓ |
Signature Algorithms (sigalgos) |
n/a | n/a | n/a | ✓ | ✓ | ✓ |
- CPython (2.7, >=3.3)
- PyPy (2.7, 3.5)
- Linux
- macOS
- Windows
- identifies not only the software version, but also application server venrdor and version
Only features that cannot be or difficultly implemented by the most popular SSL/TLS implementations (eg: GnuTls, LibreSSL, OpenSSL, wolfSSL, ...) are listed.
- support not only the final, but also draft versions
- supports each cipher suites discussed on ciphersuite.info
- supports GOST (national standards of the Russian Federation and CIS countries) cipher suites
- generates JA3 tag of any connecting TLS client independently from its type (graphical/cli, browser/email client/...)
- decodes existing JA3 tags by showing human-readable format of the TLS parameters represented by the tag
Icons made by Freepik from Flaticon.
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 can be found at Choose an open source license website.