| crypto/subtle | Package subtle implements functions that are often useful in cryptographic code but require careful thought to use correctly. |
| encoding/binary | Package binary implements simple translation between numbers and byte sequences and encoding and decoding of varints. |
| errors | Package errors implements functions to manipulate errors. |
| filippo.io/edwards25519/field | Package field implements fast arithmetic modulo 2^255-19. |
| sync | Package sync provides basic synchronization primitives such as mutual exclusion locks. |