| bytes | Package bytes implements functions for the manipulation of byte slices. |
| context | Package context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes. |
| crypto/sha256 | Package sha256 implements the SHA224 and SHA256 hash algorithms as defined in FIPS 180-4. |
| encoding/binary | Package binary implements simple translation between numbers and byte sequences and encoding and decoding of varints. |
| github.com/moby/buildkit/util/bklog | |
| github.com/opencontainers/go-digest | Package digest provides a generalized type to opaquely represent message digests and their operations within the registry. |
| github.com/pkg/errors | Package errors provides simple error handling primitives. |
| go.etcd.io/bbolt | package bbolt implements a low-level key/value store in pure Go. |
| hash | Package hash provides interfaces for hash functions. |
| regexp | Package regexp implements regular expression search. |
| sync | Package sync provides basic synchronization primitives such as mutual exclusion locks. |