| bytes | Package bytes implements functions for the manipulation of byte slices. |
| crypto | Package crypto collects common cryptographic constants. |
| 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. |
| golang.org/x/sys/cpu | Package cpu implements processor feature detection for various CPU architectures. |
| hash | Package hash provides interfaces for hash functions. |
| io | Package io provides basic interfaces to I/O primitives. |
| math/bits | Package bits implements bit counting and manipulation functions for the predeclared unsigned integer types. |
| unsafe | Package unsafe contains operations that step around the type safety of Go programs. |