| bytes | Package bytes implements functions for the manipulation of byte slices. |
| crypto | Package crypto collects common cryptographic constants. |
| crypto/ecdsa | Package ecdsa implements the Elliptic Curve Digital Signature Algorithm, as defined in [FIPS 186-5]. |
| crypto/ed25519 | Package ed25519 implements the Ed25519 signature algorithm. |
| crypto/rsa | Package rsa implements RSA encryption as specified in PKCS #1 and RFC 8017. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |