Pendulum is a drop-in replacement for the standard datetime class, providing an alternative API. As it inherits from the standard datetime all datetime instances can be replaced by Pendulum instances.

OpenSSL is an implementation of SSL/TLS.

Dehydrated is a client for obtaining certificates from an ACME server (such as Let's Encrypt) implemented as a relatively simple Bash script.

GnuTLS is a secure communications library implementing the SSL, TLS and DTLS protocols. It is provided in the form of a C library to support the protocols, as well as to parse and write X.509, PKCS #12, OpenPGP and other required structures.

Crypt::OpenSSL::Random is a OpenSSL/LibreSSL pseudo-random number generator

BearSSL is an implementation of the SSL/TLS protocol (RFC 5246) written in C. It aims at being correct and secure. In particular, insecure protocol versions and choices of algorithms are not supported, by design; cryptographic algorithm implementations are constant-time by default. It should also be small, both in RAM and code footprint. For instance, a minimal server implementation may fit in about 20 kilobytes of compiled code and 25 kilobytes of RAM.

This library provides a C99 implementation of SSL/TLS. It is designed to be familiar to users of the widely-used POSIX I/O APIs. It supports blocking, non-blocking, and full-duplex I/O. There are no locks or mutexes.

As it can be difficult to keep track of which encryption algorithms and protocols are best to use, s2n-tls features a simple API to use the latest default set of preferences. Remaining on a specific version for backwards compatibility is also supported.

Crypt::OpenSSL::Bignum provides multiprecision integer arithmetic in Perl.

Uacme is a lightweight client for the RFC8555 ACMEv2 protocol, written in plain C with minimal dependencies.

OpenSSL is an implementation of SSL/TLS.

The ASN.1 to C compiler takes ASN.1 module files and generates C++ compatible C source code. That code can be used to serialize the native C structures into compact and unambiguous BER/XER/PER-based data files, and deserialize the files back.

Various ASN.1 based formats are widely used in the industry, such as to encode the X.509 certificates employed in the HTTPS handshake, to exchange control data between mobile phones and cellular networks, to car-to-car communication in intelligent transportation networks.

This module offers some high level convenience functions for accessing web pages on SSL servers (for symmetry, the same API is offered for accessing http servers, too), an sslcat() function for writing your own clients, and finally access to the SSL api of the SSLeay/OpenSSL package so you can write servers or clients for more complicated applications.

GnuTLS is a secure communications library implementing the SSL, TLS and DTLS protocols. It is provided in the form of a C library to support the protocols, as well as to parse and write X.509, PKCS #12, OpenPGP and other required structures.

mbed TLS, formerly known as PolarSSL, makes it trivially easy for developers to include cryptographic and SSL/TLS capabilities in their (embedded) products, facilitating this functionality with a minimal coding footprint.

Certbot automatically receives and installs X.509 certificates to enable Transport Layer Security (TLS) on servers. It interoperates with the Let’s Encrypt certificate authority (CA), which issues browser-trusted certificates for free.

LibreSSL is a version of the TLS/crypto stack, forked from OpenSSL in 2014 with the goals of modernizing the codebase, improving security, and applying best practice development processes. This package also includes a netcat implementation that supports TLS.

The wolfSSL embedded SSL library (formerly CyaSSL) is an SSL/TLS library written in ANSI C and targeted for embedded, RTOS, and resource-constrained environments - primarily because of its small size, speed, and feature set. wolfSSL supports industry standards up to the current TLS 1.3 and DTLS 1.2, is up to 20 times smaller than OpenSSL, and offers progressive ciphers such as ChaCha20, Curve25519, NTRU, and Blake2b.

ACME protocol implementation in Python

Crypt::OpenSSL::RSA does RSA encoding and decoding (using the OpenSSL libraries).

AWS libcrypto (aws-lc) contains portable C implementations of algorithms needed for TLS and common applications, and includes optimized assembly versions for x86 and ARM.

OpenSSL is an implementation of SSL/TLS.

This package provides Guile bindings to GnuTLS, a library implementation the TLS protocol. It supersedes the Guile bindings that were formerly provided as part of GnuTLS.

OpenSSL is an implementation of SSL/TLS.

This package provides Guile bindings to GnuTLS, a library implementation the TLS protocol. It supersedes the Guile bindings that were formerly provided as part of GnuTLS.