initial import

vendor/github.com/wg/ecies/chacha20poly1305/chacha20poly1305.go

@@ -0,0 +1,90 @@
+// Copyright (C) 2016 - Will Glozer. All rights reserved.
+
+// Package chacha20poly1305 implements the AEAD_CHACHA20_POLY1305
+// construction as specified in RFC 7539.
+package chacha20poly1305
+
+import (
+	"encoding/binary"
+
+	"schwanenlied.me/yawning/chacha20"
+	"schwanenlied.me/yawning/poly1305"
+)
+
+const (
+	KeySize   = chacha20.KeySize
+	NonceSize = chacha20.INonceSize
+	TagSize   = poly1305.Size
+)
+
+var padding [16]byte
+
+type ChaCha20Poly1305 struct {
+	a, n uint64
+	chacha20.Cipher
+	poly1305.Poly1305
+}
+
+func New(key *[KeySize]byte, nonce *[NonceSize]byte) *ChaCha20Poly1305 {
+	x := &ChaCha20Poly1305{}
+	x.Init(key[:], nonce[:])
+	return x
+}
+
+func (x *ChaCha20Poly1305) Init(key, nonce []byte) error {
+	err := x.ReKey(key, nonce)
+	if err == nil {
+		x.initPoly1305()
+		x.Seek(1)
+		x.a = 0
+		x.n = 0
+	}
+	return err
+}
+
+func (x *ChaCha20Poly1305) Auth(src []byte) {
+	if n := len(src); n > 0 {
+		x.Poly1305.Write(src)
+		x.a = uint64(n)
+		x.Poly1305.Write(padding[:16-n%16])
+	}
+}
+
+func (x *ChaCha20Poly1305) Decrypt(dst, src []byte) {
+	x.Poly1305.Write(src)
+	x.XORKeyStream(dst, src)
+	x.n += uint64(len(src))
+}
+
+func (x *ChaCha20Poly1305) Encrypt(dst, src []byte) {
+	n := len(src)
+	x.XORKeyStream(dst, src)
+	x.Poly1305.Write(dst[:n])
+	x.n += uint64(n)
+}
+
+func (x *ChaCha20Poly1305) Tag(b []byte) []byte {
+	var lengths [16]byte
+	binary.LittleEndian.PutUint64(lengths[0:], uint64(x.a))
+	binary.LittleEndian.PutUint64(lengths[8:], uint64(x.n))
+	x.Poly1305.Write(padding[:16-x.n%16])
+	x.Poly1305.Write(lengths[:])
+	return x.Poly1305.Sum(b)
+}
+
+func (x *ChaCha20Poly1305) Reset() {
+	x.Cipher.Reset()
+}
+
+func (x *ChaCha20Poly1305) TagSize() int {
+	return TagSize
+}
+
+func (x *ChaCha20Poly1305) initPoly1305() {
+	var key [poly1305.KeySize]byte
+	x.KeyStream(key[:])
+	x.Poly1305.Init(key[:])
+	for i := range key {
+		key[i] = 0
+	}
+}

vendor/github.com/wg/ecies/chacha20poly1305/chacha20poly1305_test.go

@@ -0,0 +1,114 @@
+// Copyright (C) 2016 - Will Glozer. All rights reserved.
+
+package chacha20poly1305
+
+import (
+	"bytes"
+	"testing"
+)
+
+func TestRFC7539(t *testing.T) {
+	plaintext := []byte{
+		0x4c, 0x61, 0x64, 0x69, 0x65, 0x73, 0x20, 0x61, 0x6e, 0x64, 0x20, 0x47, 0x65, 0x6e, 0x74, 0x6c,
+		0x65, 0x6d, 0x65, 0x6e, 0x20, 0x6f, 0x66, 0x20, 0x74, 0x68, 0x65, 0x20, 0x63, 0x6c, 0x61, 0x73,
+		0x73, 0x20, 0x6f, 0x66, 0x20, 0x27, 0x39, 0x39, 0x3a, 0x20, 0x49, 0x66, 0x20, 0x49, 0x20, 0x63,
+		0x6f, 0x75, 0x6c, 0x64, 0x20, 0x6f, 0x66, 0x66, 0x65, 0x72, 0x20, 0x79, 0x6f, 0x75, 0x20, 0x6f,
+		0x6e, 0x6c, 0x79, 0x20, 0x6f, 0x6e, 0x65, 0x20, 0x74, 0x69, 0x70, 0x20, 0x66, 0x6f, 0x72, 0x20,
+		0x74, 0x68, 0x65, 0x20, 0x66, 0x75, 0x74, 0x75, 0x72, 0x65, 0x2c, 0x20, 0x73, 0x75, 0x6e, 0x73,
+		0x63, 0x72, 0x65, 0x65, 0x6e, 0x20, 0x77, 0x6f, 0x75, 0x6c, 0x64, 0x20, 0x62, 0x65, 0x20, 0x69,
+		0x74, 0x2e,
+	}
+
+	aad := []byte{
+		0x50, 0x51, 0x52, 0x53, 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,
+	}
+
+	key := []byte{
+		0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
+		0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
+	}
+
+	nonce := []byte{
+		0x07, 0x00, 0x00, 0x00,
+		0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
+	}
+
+	ciphertext := []byte{
+		0xd3, 0x1a, 0x8d, 0x34, 0x64, 0x8e, 0x60, 0xdb, 0x7b, 0x86, 0xaf, 0xbc, 0x53, 0xef, 0x7e, 0xc2,
+		0xa4, 0xad, 0xed, 0x51, 0x29, 0x6e, 0x08, 0xfe, 0xa9, 0xe2, 0xb5, 0xa7, 0x36, 0xee, 0x62, 0xd6,
+		0x3d, 0xbe, 0xa4, 0x5e, 0x8c, 0xa9, 0x67, 0x12, 0x82, 0xfa, 0xfb, 0x69, 0xda, 0x92, 0x72, 0x8b,
+		0x1a, 0x71, 0xde, 0x0a, 0x9e, 0x06, 0x0b, 0x29, 0x05, 0xd6, 0xa5, 0xb6, 0x7e, 0xcd, 0x3b, 0x36,
+		0x92, 0xdd, 0xbd, 0x7f, 0x2d, 0x77, 0x8b, 0x8c, 0x98, 0x03, 0xae, 0xe3, 0x28, 0x09, 0x1b, 0x58,
+		0xfa, 0xb3, 0x24, 0xe4, 0xfa, 0xd6, 0x75, 0x94, 0x55, 0x85, 0x80, 0x8b, 0x48, 0x31, 0xd7, 0xbc,
+		0x3f, 0xf4, 0xde, 0xf0, 0x8e, 0x4b, 0x7a, 0x9d, 0xe5, 0x76, 0xd2, 0x65, 0x86, 0xce, 0xc6, 0x4b,
+		0x61, 0x16,
+	}
+
+	tag := []byte{
+		0x1a, 0xe1, 0x0b, 0x59, 0x4f, 0x09, 0xe2, 0x6a, 0x7e, 0x90, 0x2e, 0xcb, 0xd0, 0x60, 0x06, 0x91,
+	}
+
+	c := ChaCha20Poly1305{}
+
+	err := c.Init(key, nonce)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	c.Auth(aad)
+	c.Encrypt(plaintext, plaintext)
+
+	if !bytes.Equal(plaintext, ciphertext) {
+		t.Fatal("encrypted plaintext != ciphertext")
+	}
+
+	if !bytes.Equal(c.Tag(nil), tag) {
+		t.Fatal("actual tag != expected tag")
+	}
+}
+
+func TestRFC7539_ChaCha20(t *testing.T) {
+	plaintext := []byte{
+		0x4c, 0x61, 0x64, 0x69, 0x65, 0x73, 0x20, 0x61, 0x6e, 0x64, 0x20, 0x47, 0x65, 0x6e, 0x74, 0x6c,
+		0x65, 0x6d, 0x65, 0x6e, 0x20, 0x6f, 0x66, 0x20, 0x74, 0x68, 0x65, 0x20, 0x63, 0x6c, 0x61, 0x73,
+		0x73, 0x20, 0x6f, 0x66, 0x20, 0x27, 0x39, 0x39, 0x3a, 0x20, 0x49, 0x66, 0x20, 0x49, 0x20, 0x63,
+		0x6f, 0x75, 0x6c, 0x64, 0x20, 0x6f, 0x66, 0x66, 0x65, 0x72, 0x20, 0x79, 0x6f, 0x75, 0x20, 0x6f,
+		0x6e, 0x6c, 0x79, 0x20, 0x6f, 0x6e, 0x65, 0x20, 0x74, 0x69, 0x70, 0x20, 0x66, 0x6f, 0x72, 0x20,
+		0x74, 0x68, 0x65, 0x20, 0x66, 0x75, 0x74, 0x75, 0x72, 0x65, 0x2c, 0x20, 0x73, 0x75, 0x6e, 0x73,
+		0x63, 0x72, 0x65, 0x65, 0x6e, 0x20, 0x77, 0x6f, 0x75, 0x6c, 0x64, 0x20, 0x62, 0x65, 0x20, 0x69,
+		0x74, 0x2e,
+	}
+
+	key := []byte{
+		0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
+		0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
+	}
+
+	nonce := []byte{
+		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x4a, 0x00, 0x00, 0x00, 0x00,
+	}
+
+	ciphertext := []byte{
+		0x6e, 0x2e, 0x35, 0x9a, 0x25, 0x68, 0xf9, 0x80, 0x41, 0xba, 0x07, 0x28, 0xdd, 0x0d, 0x69, 0x81,
+		0xe9, 0x7e, 0x7a, 0xec, 0x1d, 0x43, 0x60, 0xc2, 0x0a, 0x27, 0xaf, 0xcc, 0xfd, 0x9f, 0xae, 0x0b,
+		0xf9, 0x1b, 0x65, 0xc5, 0x52, 0x47, 0x33, 0xab, 0x8f, 0x59, 0x3d, 0xab, 0xcd, 0x62, 0xb3, 0x57,
+		0x16, 0x39, 0xd6, 0x24, 0xe6, 0x51, 0x52, 0xab, 0x8f, 0x53, 0x0c, 0x35, 0x9f, 0x08, 0x61, 0xd8,
+		0x07, 0xca, 0x0d, 0xbf, 0x50, 0x0d, 0x6a, 0x61, 0x56, 0xa3, 0x8e, 0x08, 0x8a, 0x22, 0xb6, 0x5e,
+		0x52, 0xbc, 0x51, 0x4d, 0x16, 0xcc, 0xf8, 0x06, 0x81, 0x8c, 0xe9, 0x1a, 0xb7, 0x79, 0x37, 0x36,
+		0x5a, 0xf9, 0x0b, 0xbf, 0x74, 0xa3, 0x5b, 0xe6, 0xb4, 0x0b, 0x8e, 0xed, 0xf2, 0x78, 0x5e, 0x42,
+		0x87, 0x4d,
+	}
+
+	c := ChaCha20Poly1305{}
+
+	err := c.Init(key, nonce)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	c.Encrypt(plaintext, plaintext)
+
+	if !bytes.Equal(plaintext, ciphertext) {
+		t.Fatal("encrypted plaintext != expected ciphertext")
+	}
+}