This module provides a monotonic() function which returns the value (in fractional seconds) of a clock which never goes backwards.

Countdown provides a fancy text display while it counts down to zero from a starting point you provide. The user can pause and resume the countdown from the text user interface.

Tzlocal returns a tzinfo object with the local timezone information. This module attempts to fix a glaring hole in pytz, that there is no way to get the local timezone information, unless you know the zoneinfo name, and under several distributions that's hard or impossible to figure out.

Utility that fakes the system time by pre-loading a small library that modifies the time, gettimeofday and clock_gettime system calls.

rdate connects to an RFC 868 time server over a TCP/IP network, printing the returned time and/or setting the system clock.

This is a python package for looking up the corresponding timezone for given coordinates on earth entirely offline.

This package provides functionality for utilizing the relativedelta feature from the dateutil library, ensuring calendar precision with aniso8601.

This module parses the most common forms of ISO 8601 date strings (e.g. 2007-01-14T20:34:22+00:00) into datetime objects.

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

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.

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.

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.

ACME protocol implementation in Python

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 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.

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.

GNU libtasn1 is a library implementing the ASN.1 notation. It is used for transmitting machine-neutral encodings of data objects in computer networking, allowing for formal validation of data according to some specifications.

OpenSSL is an implementation of SSL/TLS.

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.

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.

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

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

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.

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.