| crypto/sha256 | Package sha256 implements the SHA224 and SHA256 hash algorithms as defined in FIPS 180-4. |
| errors | Package errors implements functions to manipulate errors. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| github.com/golang/glog | Package glog implements logging analogous to the Google-internal C++ INFO/ERROR/V setup. |
| github.com/google/certificate-transparency-go | Package ct holds core types and utilities for Certificate Transparency. |
| github.com/google/certificate-transparency-go/tls | Package tls implements functionality for dealing with TLS-encoded data, as defined in RFC 5246. |
| github.com/google/trillian | Package trillian contains the generated protobuf code for the Trillian API. |
| google.golang.org/grpc/naming | |
| strings | Package strings implements simple functions to manipulate UTF-8 encoded strings. |
| time | Package time provides functionality for measuring and displaying time. |