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 ¶
const TagSize = 16
TagSize is the size, in bytes, of a poly1305 authenticator.
Variables ¶
This section is empty.
Functions ¶
func Sum ¶
Sum generates an authenticator for msg 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.
Types ¶
type MAC ¶
type MAC struct {
// contains filtered or unexported fields
}
MAC is an io.Writer computing an authentication tag of the data written to it.
MAC cannot be used like common hash.Hash implementations, because using a poly1305 key twice breaks its security. Therefore writing data to a running MAC after calling Sum or Verify causes it to panic.
func New ¶
New returns a new MAC computing an authentication tag of all data written to it with the given key. This allows writing the message progressively instead of passing it as a single slice. Common users should use the Sum function instead.
The key must be unique for each message, as authenticating two different messages with the same key allows an attacker to forge messages at will.
func (*MAC) Sum ¶
Sum computes the authenticator of all data written to the message authentication code.
func (*MAC) Verify ¶
Verify returns whether the authenticator of all data written to the message authentication code matches the expected value.