global: begin modularization

1 files changed, 0 insertions, 104 deletions

diff --git a/noise-helpers.go b/noise-helpers.go
deleted file mode 100644
index af11f09..0000000
--- a/noise-helpers.go
+++ /dev/null
@@ -1,104 +0,0 @@
-/* SPDX-License-Identifier: MIT
- *
- * Copyright (C) 2017-2019 WireGuard LLC. All Rights Reserved.
- */
-
-package main
-
-import (
-	"crypto/hmac"
-	"crypto/rand"
-	"crypto/subtle"
-	"golang.org/x/crypto/blake2s"
-	"golang.org/x/crypto/curve25519"
-	"hash"
-)
-
-/* KDF related functions.
- * HMAC-based Key Derivation Function (HKDF)
- * https://tools.ietf.org/html/rfc5869
- */
-
-func HMAC1(sum *[blake2s.Size]byte, key, in0 []byte) {
-	mac := hmac.New(func() hash.Hash {
-		h, _ := blake2s.New256(nil)
-		return h
-	}, key)
-	mac.Write(in0)
-	mac.Sum(sum[:0])
-}
-
-func HMAC2(sum *[blake2s.Size]byte, key, in0, in1 []byte) {
-	mac := hmac.New(func() hash.Hash {
-		h, _ := blake2s.New256(nil)
-		return h
-	}, key)
-	mac.Write(in0)
-	mac.Write(in1)
-	mac.Sum(sum[:0])
-}
-
-func KDF1(t0 *[blake2s.Size]byte, key, input []byte) {
-	HMAC1(t0, key, input)
-	HMAC1(t0, t0[:], []byte{0x1})
-	return
-}
-
-func KDF2(t0, t1 *[blake2s.Size]byte, key, input []byte) {
-	var prk [blake2s.Size]byte
-	HMAC1(&prk, key, input)
-	HMAC1(t0, prk[:], []byte{0x1})
-	HMAC2(t1, prk[:], t0[:], []byte{0x2})
-	setZero(prk[:])
-	return
-}
-
-func KDF3(t0, t1, t2 *[blake2s.Size]byte, key, input []byte) {
-	var prk [blake2s.Size]byte
-	HMAC1(&prk, key, input)
-	HMAC1(t0, prk[:], []byte{0x1})
-	HMAC2(t1, prk[:], t0[:], []byte{0x2})
-	HMAC2(t2, prk[:], t1[:], []byte{0x3})
-	setZero(prk[:])
-	return
-}
-
-func isZero(val []byte) bool {
-	acc := 1
-	for _, b := range val {
-		acc &= subtle.ConstantTimeByteEq(b, 0)
-	}
-	return acc == 1
-}
-
-/* This function is not used as pervasively as it should because this is mostly impossible in Go at the moment */
-func setZero(arr []byte) {
-	for i := range arr {
-		arr[i] = 0
-	}
-}
-
-func (sk *NoisePrivateKey) clamp() {
-	sk[0] &= 248
-	sk[31] = (sk[31] & 127) | 64
-}
-
-func newPrivateKey() (sk NoisePrivateKey, err error) {
-	_, err = rand.Read(sk[:])
-	sk.clamp()
-	return
-}
-
-func (sk *NoisePrivateKey) publicKey() (pk NoisePublicKey) {
-	apk := (*[NoisePublicKeySize]byte)(&pk)
-	ask := (*[NoisePrivateKeySize]byte)(sk)
-	curve25519.ScalarBaseMult(apk, ask)
-	return
-}
-
-func (sk *NoisePrivateKey) sharedSecret(pk NoisePublicKey) (ss [NoisePublicKeySize]byte) {
-	apk := (*[NoisePublicKeySize]byte)(&pk)
-	ask := (*[NoisePrivateKeySize]byte)(sk)
-	curve25519.ScalarMult(&ss, ask, apk)
-	return ss
-}