1 files changed, 0 insertions, 47 deletions
diff --git a/vendor/github.com/Rhymen/go-whatsapp/crypto/hkdf/hkdf.go b/vendor/github.com/Rhymen/go-whatsapp/crypto/hkdf/hkdf.go
deleted file mode 100644
index 3d7361f0..00000000
--- a/vendor/github.com/Rhymen/go-whatsapp/crypto/hkdf/hkdf.go
+++ /dev/null
@@ -1,47 +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/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) {
-	var h io.Reader
-	if info == "" {
-		/*
-			Only used during initial login
-			Pseudorandom Key is provided by server and has not to be created
-		*/
-		h = hkdf.Expand(sha256.New, key, []byte(info))
-	} else {
-		/*
-			Used every other time
-			Pseudorandom Key is created during kdf.New
-			This is the normal that crypto/hkdf is used
-		*/
-		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, nil
-}