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Package acme provides an implementation of the Automatic Certificate Management Environment (ACME) spec.

Package autocert provides automatic access to certificates from Let's Encrypt and any other ACME-based CA.

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

Package blake2b implements the BLAKE2b hash algorithm as defined in RFC 7693.

Package blake2s implements the BLAKE2s hash algorithm as defined in RFC 7693.

Package blowfish implements Bruce Schneier's Blowfish encryption algorithm.

Package bn256 implements a particular bilinear group at the 128-bit security level.

Package cast5 implements CAST5, as defined in RFC 2144.

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

Package cryptobyte implements building and parsing of byte strings for DER-encoded ASN.1 and TLS messages.

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

Package ed25519 implements the Ed25519 signature algorithm.

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

Package md4 implements the MD4 hash algorithm as defined in RFC 1320.

Package box authenticates and encrypts messages using public-key cryptography.

Package secretbox encrypts and authenticates small messages.

Package ocsp parses OCSP responses as specified in RFC 2560.

Package openpgp implements high level operations on OpenPGP messages.

Package armor implements OpenPGP ASCII Armor, see RFC 4880.

Package clearsign generates and processes OpenPGP, clear-signed data.

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 otr implements the Off The Record protocol as specified in http://www.cypherpunks.ca/otr/Protocol-v2-3.1.0.html

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 http://cr.yp.to/mac/poly1305-20050329.pdf.

Package ripemd160 implements the RIPEMD-160 hash algorithm.

Package salsa20 implements the Salsa20 stream cipher as specified in http://cr.yp.to/snuffle/spec.pdf.

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

Package scrypt implements the scrypt key derivation function as defined in Colin Percival's paper "Stronger Key Derivation via Sequential Memory-Hard Functions" (http://www.tarsnap.com/scrypt/scrypt.pdf).

Package sha3 implements the SHA-3 fixed-output-length hash functions and the SHAKE variable-output-length hash functions defined by FIPS-202.

Package ssh implements an SSH client and server.

Package agent implements the ssh-agent protocol, and provides both a client and a server.

Package knownhosts implements a parser for the OpenSSH known_hosts host key database.

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

This package contains integration tests for the golang.org/x/crypto/ssh package.

Package twofish implements Bruce Schneier's Twofish encryption algorithm.

Package xtea implements XTEA encryption, as defined in Needham and Wheeler's 1997 technical report, "Tea extensions."

Package xts implements the XTS cipher mode as specified in IEEE P1619/D16.