package kdf

import "go.mau.fi/libsignal/kdf"

Package kdf provides a key derivation function to calculate key output and negotiate shared secrets for curve X25519 keys.

Index ¶

• func CalculateSharedSecret(theirKey, ourKey [32]byte) [32]byte
• func DeriveSecrets(inputKeyMaterial, salt, info []byte, outputLength int) ([]byte, error)
• type HKDF
• type KeyMaterial

Functions ¶

func CalculateSharedSecret ¶

func CalculateSharedSecret(theirKey, ourKey [32]byte) [32]byte

CalculateSharedSecret uses DH Curve25519 to find a shared secret. The result of this function should be used in `DeriveSecrets` to output the Root and Chain keys.

func DeriveSecrets ¶

func DeriveSecrets(inputKeyMaterial, salt, info []byte, outputLength int) ([]byte, error)

DeriveSecrets derives the requested number of bytes using HKDF with the given input, salt, and info.

Types ¶

type HKDF ¶

type HKDF func(inputKeyMaterial, salt, info []byte, outputLength int) ([]byte, error)

HKDF is a hashed key derivation function type that can be used to derive keys.

type KeyMaterial ¶

type KeyMaterial struct {
	CipherKey []byte
	MacKey    []byte
	IV        []byte
}

KeyMaterial is a structure for representing a cipherkey, mac, and iv

Source Files ¶

HKDF.go