Package context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes.

Package crypto collects common cryptographic constants.

Package aes implements AES encryption (formerly Rijndael), as defined in U.S. Federal Information Processing Standards Publication 197.

Package cipher implements standard block cipher modes that can be wrapped around low-level block cipher implementations.

Package des implements the Data Encryption Standard (DES) and the Triple Data Encryption Algorithm (TDEA) as defined in U.S. Federal Information Processing Standards Publication 46-3.

Package dsa implements the Digital Signature Algorithm, as defined in FIPS 186-3.

Package ecdh implements Elliptic Curve Diffie-Hellman over NIST curves and Curve25519.

Package ecdsa implements the Elliptic Curve Digital Signature Algorithm, as defined in FIPS 186-4 and SEC 1, Version 2.0.

Package ed25519 implements the Ed25519 signature algorithm.

Package elliptic implements the standard NIST P-224, P-256, P-384, and P-521 elliptic curves over prime fields.