hkdfchacha20poly1305

Documentation

Overview

Package hkdfchacha20poly1305 creates an AEAD using hkdf, chacha20, and poly1305 When sealing and opening, the hkdf is used to obtain the nonce and subkey for chacha20. Other than the change for the how the subkey and nonce for chacha are obtained, this is the same as chacha20poly1305

Index

• Constants
• func New(key []byte) (cipher.AEAD, error)

Constants

const (
	// KeySize is the size of the key used by this AEAD, in bytes.
	KeySize = 32
	// NonceSize is the size of the nonce used with this AEAD, in bytes.
	NonceSize = 24
	// TagSize is the size added from poly1305
	TagSize = 16
	// MaxPlaintextSize is the max size that can be passed into a single call of Seal
	MaxPlaintextSize = (1 << 38) - 64
	// MaxCiphertextSize is the max size that can be passed into a single call of Open,
	// this differs from plaintext size due to the tag
	MaxCiphertextSize = (1 << 38) - 48
	// HkdfInfo is the parameter used internally for Hkdf's info parameter.
	HkdfInfo = "Demars-DMC_SECRET_CONNECTION_FRAME_KEY_DERIVE"
)

Functions

func New

func New(key []byte) (cipher.AEAD, error)

New xChaChapoly1305 AEAD with 24 byte nonces