| crypto | Package crypto collects common cryptographic constants. |
| crypto/rsa | Package rsa implements RSA encryption as specified in PKCS#1. |
| crypto/sha256 | Package sha256 implements the SHA224 and SHA256 hash algorithms as defined in FIPS 180-4. |
| golang.org/x/crypto/openpgp/armor | Package armor implements OpenPGP ASCII Armor, see RFC 4880. |
| golang.org/x/crypto/openpgp/errors | Package errors contains common error types for the OpenPGP packages. |
| golang.org/x/crypto/openpgp/packet | Package packet implements parsing and serialization of OpenPGP packets, as specified in RFC 4880. |
| golang.org/x/crypto/openpgp/s2k | Package s2k implements the various OpenPGP string-to-key transforms as specified in RFC 4800 section 3.7.1. |
| hash | Package hash provides interfaces for hash functions. |
| io | Package io provides basic interfaces to I/O primitives. |
| strconv | Package strconv implements conversions to and from string representations of basic data types. |
| time | Package time provides functionality for measuring and displaying time. |