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Package blowfish implements Bruce Schneier's Blowfish encryption algorithm.

Package chacha20 implements the ChaCha20 and XChaCha20 encryption algorithms as specified in RFC 8439 and draft-irtf-cfrg-xchacha-01.

Package cryptobyte contains types that help with parsing and constructing length-prefixed, binary messages, including ASN.1 DER.

Package asn1 contains supporting types for parsing and building ASN.1 messages with the cryptobyte package.

Package curve25519 provides an implementation of the X25519 function, which performs scalar multiplication on the elliptic curve known as Curve25519.

Package ed25519 implements the Ed25519 signature algorithm.

Package secretbox encrypts and authenticates small messages.

Package pbkdf2 implements the key derivation function PBKDF2 as defined in RFC 2898 / PKCS #5 v2.0.

Package pkcs12 implements some of PKCS#12.

Package poly1305 implements Poly1305 one-time message authentication code as specified in https://cr.yp.to/mac/poly1305-20050329.pdf.

Package salsa provides low-level access to functions in the Salsa family.

Package ssh implements an SSH client and server.

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 html implements an HTML5-compliant tokenizer and parser.

Package atom provides integer codes (also known as atoms) for a fixed set of frequently occurring HTML strings: tag names and attribute keys such as "p" and "id".

Package httpguts provides functions implementing various details of the HTTP specification.

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 idna implements IDNA2008 using the compatibility processing defined by UTS (Unicode Technical Standard) #46, which defines a standard to deal with the transition from IDNA2003.

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

Package websocket implements a client and server for the WebSocket protocol as specified in RFC 6455.

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

Package jws provides a partial implementation of JSON Web Signature encoding and decoding.

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

Package singleflight provides a duplicate function call suppression mechanism.

Package cpu implements processor feature detection for various CPU architectures.

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

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

Package encoding defines an interface for character encodings, such as Shift JIS and Windows 1252, that can convert to and from UTF-8.

Package unicode provides Unicode encodings such as UTF-16.

Package runes provide transforms for UTF-8 encoded text.

Package bidirule implements the Bidi Rule defined by RFC 5893.

Package transform provides reader and writer wrappers that transform the bytes passing through as well as various transformations.

Package bidi contains functionality for bidirectional text support.

Package norm contains types and functions for normalizing Unicode strings.

Package width provides functionality for handling different widths in text.

Package rate provides a rate limiter.

Package intsets provides Sparse, a compact and fast representation for sparse sets of int values.