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Package bcrypt implements Provos and Mazières's bcrypt adaptive hashing algorithm.

Package blowfish implements Bruce Schneier's Blowfish encryption algorithm.

Package cast5 implements CAST5, as defined in RFC 2144.

Package curve25519 provides an implementation of scalar multiplication on the elliptic curve known as curve25519.

Package openpgp implements high level operations on OpenPGP messages.

Package armor implements OpenPGP ASCII Armor, see RFC 4880.

Package elgamal implements ElGamal encryption, suitable for OpenPGP, as specified in "A Public-Key Cryptosystem and a Signature Scheme Based on Discrete Logarithms," IEEE Transactions on Information Theory, v.

Package errors contains common error types for the OpenPGP packages.

Package packet implements parsing and serialization of OpenPGP packets, as specified in RFC 4880.

Package s2k implements the various OpenPGP string-to-key transforms as specified in RFC 4800 section 3.7.1.

Package ssh implements an SSH client and server.

Package agent implements a client to an ssh-agent daemon.

Package terminal provides support functions for dealing with terminals, as commonly found on UNIX systems.

Package context defines the Context type, which carries deadlines, cancelation signals, and other request-scoped values across API boundaries and between processes.

Package ctxhttp provides helper functions for performing context-aware HTTP requests.

Package http2 implements the HTTP/2 protocol.

Package hpack implements HPACK, a compression format for efficiently representing HTTP header fields in the context of HTTP/2.

Package trace implements tracing of requests and long-lived objects.

Package google provides support for making OAuth2 authorized and authenticated HTTP requests to Google APIs.

Package jws provides encoding and decoding utilities for signed JWS messages.

Package jwt implements the OAuth 2.0 JSON Web Token flow, commonly known as "two-legged OAuth 2.0".

Package unix contains an interface to the low-level operating system primitives.