package hmac

Import Path
	crypto/hmac (on golang.org and go.dev)

Dependency Relation
	imports 2 packages, and imported by 3 packages

Involved Source Files Package hmac implements the Keyed-Hash Message Authentication Code (HMAC) as defined in U.S. Federal Information Processing Standards Publication 198. An HMAC is a cryptographic hash that uses a key to sign a message. The receiver verifies the hash by recomputing it using the same key. Receivers should be careful to use Equal to compare MACs in order to avoid timing side-channels: // ValidMAC reports whether messageMAC is a valid HMAC tag for message. func ValidMAC(message, messageMAC, key []byte) bool { mac := hmac.New(sha256.New, key) mac.Write(message) expectedMAC := mac.Sum(nil) return hmac.Equal(messageMAC, expectedMAC) }
Package-Level Functions (total 2)
Equal compares two MACs for equality without leaking timing information.
New returns a new HMAC hash using the given hash.Hash type and key. New functions like sha256.New from crypto/sha256 can be used as h. h must return a new Hash every time it is called. Note that unlike other hash implementations in the standard library, the returned Hash does not implement encoding.BinaryMarshaler or encoding.BinaryUnmarshaler.