9 Stars
Updated Last
11 Months Ago
Started In
September 2022


OpenSSL Julia bindings.

Build Status codecov


The package can be installed with Julia's package manager, either by using the Pkg REPL mode (press ] to enter):

pkg> add OpenSSL

or by using Pkg functions

julia> using Pkg; Pkg.add("OpenSSL")

Project Status

The package has matured and is used in many production systems. But as with all open-source software, please try it out and report your experience.

The package is tested against current Julia LTS (1.6), latest release (1.8), and nightly on Linux, macOS, and Windows.

Contributing and Questions

Contributions are very welcome, as are feature requests and suggestions. Please open an issue if you encounter any problems or would just like to ask a question.


While various parts of the openssl API are wrapped and tested, the main user-facing API expected to work at the moment is for http TLS encryption/decryption, used like:

using OpenSSL, Sockets
# open a simple TCP connection to an https endpoint
tcp = connect("www.nghttp2.org", 443)
# wrap tcp socket in OpenSSL.SSLStream
ssl = SSLStream(tcp)
# inject host for cert verification
OpenSSL.hostname!(ssl, "www.nghttp2.org")
# perform TLS handshake
# can now write/read from ssl
request_str = "GET / HTTP/1.1\r\nHost: www.nghttp2.org\r\nUser-Agent: curl\r\nAccept: */*\r\n\r\n"
written = write(ssl, request_str)
@test !eof(ssl)
io = IOBuffer()
write(io, readavailable(ssl))
response = String(take!(io))
@test startswith(response, "HTTP/1.1 200 OK\r\n")

Required Packages