DirSha256 returns sha256 digest of a directory.

DockerImageSha256 returns a sha256 digest of a docker image.

FileSha256 returns a sha256 digest of a file.

RemoteDockerImageSha256 returns a sha256 digest of a docker image by reading it from remote docker registry.

ValidateDigest checks if a digest matches the sha256 regex.

ErrRepoDigestUnavailable returned when repo digest is not available.