Add dependencies/vendor (whatsapp)

vendor/github.com/Rhymen/go-whatsapp/crypto/curve25519/curve.go

@@ -1,44 +0,0 @@
-/*
-In cryptography, Curve25519 is an elliptic curve offering 128 bits of security and designed for use with the elliptic
-curve Diffie–Hellman (ECDH) key agreement scheme. It is one of the fastest ECC curves and is not covered by any known
-patents. The reference implementation is public domain software. The original Curve25519 paper defined it
-as a Diffie–Hellman (DH) function.
-*/
-package curve25519
-
-import (
-	"crypto/rand"
-	"golang.org/x/crypto/curve25519"
-	"io"
-)
-
-/*
-GenerateKey generates a public private key pair using Curve25519.
-*/
-func GenerateKey() (privateKey *[32]byte, publicKey *[32]byte, err error) {
-	var pub, priv [32]byte
-
-	_, err = io.ReadFull(rand.Reader, priv[:])
-	if err != nil {
-		return nil, nil, err
-	}
-
-	priv[0] &= 248
-	priv[31] &= 127
-	priv[31] |= 64
-
-	curve25519.ScalarBaseMult(&pub, &priv)
-
-	return &priv, &pub, nil
-}
-
-/*
-GenerateSharedSecret generates the shared secret with a given public private key pair.
-*/
-func GenerateSharedSecret(priv, pub [32]byte) []byte {
-	var secret [32]byte
-
-	curve25519.ScalarMult(&secret, &priv, &pub)
-
-	return secret[:]
-}