poly1305

package
Version: v0.0.0-...-73551c6 Latest Latest
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Published: Dec 24, 2017 License: BSD-3-Clause Imports: 1 Imported by: 0

Documentation

Overview

Package poly1305 implements Poly1305 one-time message authentication code as specified in https://cr.yp.to/mac/poly1305-20050329.pdf.

Poly1305 is a fast, one-time authentication function. It is infeasible for an attacker to generate an authenticator for a message without the key. However, a key must only be used for a single message. Authenticating two different messages with the same key allows an attacker to forge authenticators for other messages with the same key.

Poly1305 was originally coupled with AES in order to make Poly1305-AES. AES was used with a fixed key in order to generate one-time keys from an nonce. However, in this package AES isn't used and the one-time key is specified directly.

Index

Constants

View Source
const TagSize = 16

TagSize is the size, in bytes, of a poly1305 authenticator.

Variables

This section is empty.

Functions

func Sum

func Sum(out *[16]byte, m []byte, key *[32]byte)

Sum generates an authenticator for m using a one-time key and puts the 16-byte result into out. Authenticating two different messages with the same key allows an attacker to forge messages at will.

func Verify

func Verify(mac *[16]byte, m []byte, key *[32]byte) bool

Verify returns true if mac is a valid authenticator for m with the given key.

Types

This section is empty.

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