From 3418e8c9afbdf3e94ab26a20d8f12c042ae29fc4 Mon Sep 17 00:00:00 2001
From: Wim <wim@42.be>
Date: Thu, 30 May 2019 12:20:56 +0200
Subject: Use upstream whatsapp again (#809)

---
 .../matterbridge/go-whatsapp/crypto/hkdf/hkdf.go   | 52 ----------------------
 1 file changed, 52 deletions(-)
 delete mode 100644 vendor/github.com/matterbridge/go-whatsapp/crypto/hkdf/hkdf.go

(limited to 'vendor/github.com/matterbridge/go-whatsapp/crypto/hkdf')

diff --git a/vendor/github.com/matterbridge/go-whatsapp/crypto/hkdf/hkdf.go b/vendor/github.com/matterbridge/go-whatsapp/crypto/hkdf/hkdf.go
deleted file mode 100644
index e0be0587..00000000
--- a/vendor/github.com/matterbridge/go-whatsapp/crypto/hkdf/hkdf.go
+++ /dev/null
@@ -1,52 +0,0 @@
-/*
-HKDF is a simple key derivation function (KDF) based on
-a hash-based message authentication code (HMAC). It was initially proposed by its authors as a building block in
-various protocols and applications, as well as to discourage the proliferation of multiple KDF mechanisms.
-The main approach HKDF follows is the "extract-then-expand" paradigm, where the KDF logically consists of two modules:
-the first stage takes the input keying material and "extracts" from it a fixed-length pseudorandom key, and then the
-second stage "expands" this key into several additional pseudorandom keys (the output of the KDF).
-*/
-package hkdf
-
-import (
-	"crypto/hmac"
-	"crypto/sha256"
-	"fmt"
-	"golang.org/x/crypto/hkdf"
-	"io"
-)
-
-/*
-Expand expands a given key with the HKDF algorithm.
-*/
-func Expand(key []byte, length int, info string) ([]byte, error) {
-	if info == "" {
-		keyBlock := hmac.New(sha256.New, key)
-		var out, last []byte
-
-		var blockIndex byte = 1
-		for i := 0; len(out) < length; i++ {
-			keyBlock.Reset()
-			//keyBlock.Write(append(append(last, []byte(info)...), blockIndex))
-			keyBlock.Write(last)
-			keyBlock.Write([]byte(info))
-			keyBlock.Write([]byte{blockIndex})
-			last = keyBlock.Sum(nil)
-			blockIndex += 1
-			out = append(out, last...)
-		}
-		return out[:length], nil
-	} else {
-		h := hkdf.New(sha256.New, key, nil, []byte(info))
-		out := make([]byte, length)
-		n, err := io.ReadAtLeast(h, out, length)
-		if err != nil {
-			return nil, err
-		}
-		if n != length {
-			return nil, fmt.Errorf("new key to short")
-		}
-
-		return out[:length], nil
-	}
-}
-- 
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