Add whatsappmulti buildflag for whatsapp with multidevice support (whatsapp)

3 files changed, 192 insertions, 0 deletions

diff --git a/vendor/github.com/Rhymen/go-whatsapp/crypto/cbc/cbc.go b/vendor/github.com/Rhymen/go-whatsapp/crypto/cbc/cbc.go
new file mode 100644
index 00000000..cc5427c3
--- /dev/null
+++ b/vendor/github.com/Rhymen/go-whatsapp/crypto/cbc/cbc.go
@@ -0,0 +1,101 @@
+/*
+CBC describes a block cipher mode. In cryptography, a block cipher mode of operation is an algorithm that uses a
+block cipher to provide an information service such as confidentiality or authenticity. A block cipher by itself
+is only suitable for the secure cryptographic transformation (encryption or decryption) of one fixed-length group of
+bits called a block. A mode of operation describes how to repeatedly apply a cipher's single-block operation to
+securely transform amounts of data larger than a block.
+
+This package simplifies the usage of AES-256-CBC.
+*/
+package cbc
+
+/*
+Some code is provided by the GitHub user locked (github.com/locked):
+https://gist.github.com/locked/b066aa1ddeb2b28e855e
+Thanks!
+*/
+import (
+	"bytes"
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/rand"
+	"fmt"
+	"io"
+)
+
+/*
+Decrypt is a function that decrypts a given cipher text with a provided key and initialization vector(iv).
+*/
+func Decrypt(key, iv, ciphertext []byte) ([]byte, error) {
+	block, err := aes.NewCipher(key)
+
+	if err != nil {
+		return nil, err
+	}
+
+	if len(ciphertext) < aes.BlockSize {
+		return nil, fmt.Errorf("ciphertext is shorter then block size: %d / %d", len(ciphertext), aes.BlockSize)
+	}
+
+	if iv == nil {
+		iv = ciphertext[:aes.BlockSize]
+		ciphertext = ciphertext[aes.BlockSize:]
+	}
+
+	cbc := cipher.NewCBCDecrypter(block, iv)
+	cbc.CryptBlocks(ciphertext, ciphertext)
+
+	return unpad(ciphertext)
+}
+
+/*
+Encrypt is a function that encrypts plaintext with a given key and an optional initialization vector(iv).
+*/
+func Encrypt(key, iv, plaintext []byte) ([]byte, error) {
+	plaintext = pad(plaintext, aes.BlockSize)
+
+	if len(plaintext)%aes.BlockSize != 0 {
+		return nil, fmt.Errorf("plaintext is not a multiple of the block size: %d / %d", len(plaintext), aes.BlockSize)
+	}
+
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+
+	var ciphertext []byte
+	if iv == nil {
+		ciphertext = make([]byte, aes.BlockSize+len(plaintext))
+		iv := ciphertext[:aes.BlockSize]
+		if _, err := io.ReadFull(rand.Reader, iv); err != nil {
+			return nil, err
+		}
+
+		cbc := cipher.NewCBCEncrypter(block, iv)
+		cbc.CryptBlocks(ciphertext[aes.BlockSize:], plaintext)
+	} else {
+		ciphertext = make([]byte, len(plaintext))
+
+		cbc := cipher.NewCBCEncrypter(block, iv)
+		cbc.CryptBlocks(ciphertext, plaintext)
+	}
+
+	return ciphertext, nil
+}
+
+func pad(ciphertext []byte, blockSize int) []byte {
+	padding := blockSize - len(ciphertext)%blockSize
+	padtext := bytes.Repeat([]byte{byte(padding)}, padding)
+	return append(ciphertext, padtext...)
+}
+
+func unpad(src []byte) ([]byte, error) {
+	length := len(src)
+	padLen := int(src[length-1])
+
+	if padLen > length {
+		return nil, fmt.Errorf("padding is greater then the length: %d / %d", padLen, length)
+	}
+
+	return src[:(length - padLen)], nil
+}
diff --git a/vendor/github.com/Rhymen/go-whatsapp/crypto/curve25519/curve.go b/vendor/github.com/Rhymen/go-whatsapp/crypto/curve25519/curve.go
new file mode 100644
index 00000000..5ddf9c9a
--- /dev/null
+++ b/vendor/github.com/Rhymen/go-whatsapp/crypto/curve25519/curve.go
@@ -0,0 +1,44 @@
+/*
+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[:]
+}
diff --git a/vendor/github.com/Rhymen/go-whatsapp/crypto/hkdf/hkdf.go b/vendor/github.com/Rhymen/go-whatsapp/crypto/hkdf/hkdf.go
new file mode 100644
index 00000000..3d7361f0
--- /dev/null
+++ b/vendor/github.com/Rhymen/go-whatsapp/crypto/hkdf/hkdf.go
@@ -0,0 +1,47 @@
+/*
+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
+}