hmac
packagestandard library
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Documentation¶
Overview¶
Package hmac implements the Keyed-Hash Message Authentication Code (HMAC) asdefined 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 avoidtiming 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)}Index¶
Constants¶
This section is empty.
Variables¶
This section is empty.
Functions¶
funcNew¶
New returns a new HMAC hash using the givenhash.Hash type and key.New functions likecrypto/sha256.New 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 implementencoding.BinaryMarshalerorencoding.BinaryUnmarshaler.
Types¶
This section is empty.
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