zmap/zcrypto

Liberal Go TLS + X.509 Library for Research

156

stars

675

commits

Go

primary language

Sep 8, 2026

updated

README

ZCrypto

Go Report Card GoDoc

ZCrypto contains specialized versions of tls and x509. It is written in Golang and is primarily based on Golang's TLS library.

IMPORTANT!

Danger: Experimental

ZCrypto is a research library, designed to be used for data collection and analysis, as well as experimenting and prototyping. It should not be used to provide security for production systems.

zcrypto/tls (formerly known as ZTLS)

A research TLS library based on Golang standard library crypto/tls that contains that speaks old TLS versions, export ciphers, logs handshake messages, and is highly configurable. Many scary parts are exposed as public variables. It is primarily used for data collection, and is used by ZGrab. Uses zcrypto/x509.

zcrypto/x509

A fork of the Golang stdlib crypto/x509 that adds the ability to serialize certificates to JSON, and plays nice with CT.

zcrypto/ct

A fork of the Google Certificate Transparency Golang library, designed to play nice with ZCrypto.

Documentation

Documentation uses Godoc. See https://godoc.org/github.com/zmap/zcrypto.

Contributors

(top 30 of 57)

dadrian

203 commits

umbernhard

52 commits

zakird

47 commits

cpu

35 commits

zmap/zcrypto

Liberal Go TLS + X.509 Library for Research

156

stars

675

commits

Go

primary language

Sep 8, 2026

updated

README

ZCrypto

Go Report Card GoDoc

ZCrypto contains specialized versions of tls and x509. It is written in Golang and is primarily based on Golang's TLS library.

IMPORTANT!

Danger: Experimental

ZCrypto is a research library, designed to be used for data collection and analysis, as well as experimenting and prototyping. It should not be used to provide security for production systems.

zcrypto/tls (formerly known as ZTLS)

A research TLS library based on Golang standard library crypto/tls that contains that speaks old TLS versions, export ciphers, logs handshake messages, and is highly configurable. Many scary parts are exposed as public variables. It is primarily used for data collection, and is used by ZGrab. Uses zcrypto/x509.

zcrypto/x509

A fork of the Golang stdlib crypto/x509 that adds the ability to serialize certificates to JSON, and plays nice with CT.

zcrypto/ct

A fork of the Google Certificate Transparency Golang library, designed to play nice with ZCrypto.

Documentation

Documentation uses Godoc. See https://godoc.org/github.com/zmap/zcrypto.

Contributors

(top 30 of 57)

dadrian

203 commits

umbernhard

52 commits

zakird

47 commits

cpu

35 commits

Languages

Go

98.1%

Python

1.7%