| crypto/internal/boring | Package boring provides access to BoringCrypto implementation functions. |
| crypto/internal/fips140/drbg | Package drbg provides cryptographically secure random bytes usable by FIPS code. |
| crypto/internal/randutil | Package randutil contains internal randomness utilities for various crypto packages. |
| internal/godebug | Package godebug makes the settings in the $GODEBUG environment variable available to other packages. |
| io | Package io provides basic interfaces to I/O primitives. |
| unsafe | Package unsafe contains operations that step around the type safety of Go programs. |