| context | Package context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes. |
| crypto | Package crypto collects common cryptographic constants. |
| crypto/rand | Package rand implements a cryptographically secure random number generator. |
| encoding/base64 | Package base64 implements base64 encoding as specified by RFC 4648. |
| encoding/json | Package json implements encoding and decoding of JSON as defined in RFC 7159. |
| flag | Package flag implements command-line flag parsing. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| github.com/docker/distribution/context | Package context provides several utilities for working with Go's context in http requests. |
| github.com/docker/distribution/registry/api/errcode | |
| github.com/docker/distribution/registry/auth | Package auth defines a standard interface for request access controllers. |
| github.com/docker/distribution/registry/auth/htpasswd | Package htpasswd provides a simple authentication scheme that checks for the user credential hash in an htpasswd formatted file in a configuration-determined location. |
| github.com/docker/distribution/registry/auth/token | |
| github.com/docker/libtrust | Package libtrust provides an interface for managing authentication and authorization using public key cryptography. |
| github.com/gorilla/mux | Package mux implements a request router and dispatcher. |
| github.com/sirupsen/logrus | Package logrus is a structured logger for Go, completely API compatible with the standard library logger. |
| io | Package io provides basic interfaces to I/O primitives. |
| math/big | Package big implements arbitrary-precision arithmetic (big numbers). |
| net/http | Package http provides HTTP client and server implementations. |
| regexp | Package regexp implements regular expression search. |
| strconv | Package strconv implements conversions to and from string representations of basic data types. |
| strings | Package strings implements simple functions to manipulate UTF-8 encoded strings. |
| time | Package time provides functionality for measuring and displaying time. |