| crypto/cipher | Package cipher implements standard block cipher modes that can be wrapped around low-level block cipher implementations. |
| 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/crypto/chacha20 | Package chacha20 implements the ChaCha20 and XChaCha20 encryption algorithms as specified in RFC 8439 and draft-irtf-cfrg-xchacha-01. |
| golang.org/x/crypto/internal/alias | Package alias implements memory aliasing tests. |
| golang.org/x/crypto/internal/poly1305 | Package poly1305 implements Poly1305 one-time message authentication code as specified in https://cr.yp.to/mac/poly1305-20050329.pdf. |
| golang.org/x/sys/cpu | Package cpu implements processor feature detection for various CPU architectures. |