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Package chacha20poly1305 implements the ChaCha20-Poly1305 AEAD as specified in RFC 7539.

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 scalar multiplication on the elliptic curve known as curve25519.

Package hkdf implements the HMAC-based Extract-and-Expand Key Derivation Function (HKDF) as defined in RFC 5869.

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

Package dnsmessage provides a mostly RFC 1035 compliant implementation of DNS message packing and unpacking.

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

Package httpproxy provides support for HTTP proxy determination based on environment variables, as provided by net/http's ProxyFromEnvironment function.

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 nettest provides utilities for network testing.

Package route provides basic functions for the manipulation of packet routing facilities on BSD variants.

secure is a repository of text security related packages.

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.

unicode holds packages with implementations of Unicode standards that are mostly used as building blocks for other packages in internal/x/text, layout engines, or are otherwise more low-level in nature.

Package bidi contains functionality for bidirectional text support.

Package norm contains types and functions for normalizing Unicode strings.