Libsignal-protocol-go is a Go implementation of the Signal Client Protocol.

Package keccak implements the Keccak (SHA-3) hash algorithm. See http://keccak.noekeon.org.

Package crypt is a implementation of crypt(3) by golang, originated from https://code.google.com/p/go-crypt.

FarmHash provides hash functions for strings and other data. The functions mix the input bits thoroughly but are not suitable for cryptography. It is implemented as a mechanical translation of the non-SSE4/non-AESNI hash functions from Google's FarmHash.

Package shuffle provides primitives for shuffling slices and user-defined collections.

This package provides a Go implementation of JSON Web Tokens and supports the parsing and verification as well as the generation and signing of JSON Web Tokens. The currently supported signing algorithms are HMAC SHA, RSA, RSA-PSS, and ECDSA, though hooks are present for adding your own.

GoPtLib is a library for writing Tor pluggable transports in Go.

This package implements functionality based on ideas and concepts from Philipp Winter's ScrambleSuit protocol. The notable differences between ScrambleSuit and obfs4:

• the handshake always does a full key exchange (no such thing as a Session Ticket Handshake)

• the handshake uses the Tor Project's ntor handshake with public keys obfuscated via the Elligator 2 mapping

• the link layer encryption uses NaCl secret boxes (Poly1305/XSalsa20)

Package ssh wraps the crypto/ssh package with a higher-level API for building SSH servers. The goal of the API was to make it as simple as using net/http, so the API is very similar.

This package provides a large set of test vectors for the age file encryption format, as well as a framework to easily generate them.

The test suite can be applied to any age implementation, regardless of the language it's implemented in, and the level of abstraction of its interface. For the simplest, most universal integration, the implementation can just attempt to decrypt the test files, check the operation only succeeds if expect is success, and compare the decrypted payload. Test vectors involving unimplemented features (such as passphrase encryption or armoring) can be ignored.

Go-OpenVPN-Mgmt implements a client for the OpenVPN management interface. It can be used to monitor and control an OpenVPN process running with its management port enabled.

A Golang library to verify Minisign signatures.

This package produces a collection of cryptographic utilities, including the following:

• drbg: a cryptographically secure pseudorandom number generator as specified in NIST SP 800-90A

• encoding/base32: a compact base32 encoder

• secretkey: user-friendly secret keys that can be used with secretbox

• salsa20: a streaming interface (cipher.Stream) for the Salsa20 stream cipher

• poly1305: a streaming interface (hash.Hash) for the Poly1305 one-time authenticator as specified in poly1305

This package provides a Go library for the Concise Binary Object Representation (CBOR) Object Signing and Encryption (COSE) specification.

This package implements the edwards25519 elliptic curve in Go, exposing the necessary APIs to build a wide array of higher-level primitives.

Package btcec implements elliptic curve cryptography needed for working with Bitcoin (secp256k1 only for now). It is designed so that it may be used with the standard crypto/ecdsa packages provided with Go. A comprehensive suite of test is provided to ensure proper functionality. Package btcec was originally based on work from ThePiachu which is licensed under the same terms as Go, but it has significantly diverged since then. The btcsuite developers original is licensed under the liberal ISC license.

Although this package was primarily written for btcd, it has intentionally been designed so it can be used as a standalone package for any projects needing to use secp256k1 elliptic curve cryptography.

Package pinentry provides a client to GnuPG's pinentry.

This package provides a Go implementation of JSON Web Tokens and supports the parsing and verification as well as the generation and signing of JSON Web Tokens. The currently supported signing algorithms are HMAC SHA, RSA, RSA-PSS, and ECDSA, though hooks are present for adding your own.

This package implements the pseudo-random-function (PRF) HighwayHash. HighwayHash is a fast hash function designed to defend hash-flooding attacks or to authenticate short-lived messages.

Package xxhash implements the 64-bit variant of xxHash (XXH64) as described at https://xxhash.com/.

Obfs4 is a look-like nothing obfuscation protocol that incorporates ideas and concepts from Philipp Winter's ScrambleSuit protocol.

The notable differences between ScrambleSuit and obfs4 are:

• The handshake always does a full key exchange (no such thing as a Session Ticket Handshake).

• The handshake uses the Tor Project's ntor handshake with public keys obfuscated via the Elligator 2 mapping.

• The link layer encryption uses NaCl secret boxes (Poly1305/XSalsa20).

Gonum is a set of packages designed to make writing numerical and scientific algorithms productive, performant, and scalable. It provides libraries for matrices and linear algebra; statistics, probability distributions, and sampling; tools for function differentiation,integration, and optimization; network creation and analysis

Package fastdiv implements fast division, modulus and divisibility checks for divisors known only at runtime based on paper: Faster Remainder by Direct Computation: Applications to Compilers and Software Libraries.

This package implements much of the decimal specification from the General Decimal Arithmetic description. This is the same specification implemented by Python’s decimal module and GCC’s decimal extension.