internal/wycheproof: add test for ChaCha20-Poly1305 AEAD encryption/decryption
Change-Id: I71d62f95954a39c476bee55e22b6fcf96a196de1
Reviewed-on: https://go-review.googlesource.com/c/crypto/+/214939
Run-TryBot: Katie Hockman <katie@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
diff --git a/internal/wycheproof/chacha20_poly1305_test.go b/internal/wycheproof/chacha20_poly1305_test.go
new file mode 100644
index 0000000..7fedbc4
--- /dev/null
+++ b/internal/wycheproof/chacha20_poly1305_test.go
@@ -0,0 +1,148 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package wycheproof
+
+import (
+ "crypto/cipher"
+ "encoding/hex"
+ "testing"
+
+ "golang.org/x/crypto/chacha20poly1305"
+)
+
+func TestChaCha20Poly1305(t *testing.T) {
+ // AeadTestVector
+ type AeadTestVector struct {
+
+ // additional authenticated data
+ Aad string `json:"aad,omitempty"`
+
+ // A brief description of the test case
+ Comment string `json:"comment,omitempty"`
+
+ // the ciphertext (without iv and tag)
+ Ct string `json:"ct,omitempty"`
+
+ // A list of flags
+ Flags []string `json:"flags,omitempty"`
+
+ // the nonce
+ Iv string `json:"iv,omitempty"`
+
+ // the key
+ Key string `json:"key,omitempty"`
+
+ // the plaintext
+ Msg string `json:"msg,omitempty"`
+
+ // Test result
+ Result string `json:"result,omitempty"`
+
+ // the authentication tag
+ Tag string `json:"tag,omitempty"`
+
+ // Identifier of the test case
+ TcId int `json:"tcId,omitempty"`
+ }
+
+ // Notes a description of the labels used in the test vectors
+ type Notes struct {
+ }
+
+ // AeadTestGroup
+ type AeadTestGroup struct {
+
+ // the IV size in bits
+ IvSize int `json:"ivSize,omitempty"`
+
+ // the keySize in bits
+ KeySize int `json:"keySize,omitempty"`
+
+ // the expected size of the tag in bits
+ TagSize int `json:"tagSize,omitempty"`
+ Tests []*AeadTestVector `json:"tests,omitempty"`
+ Type interface{} `json:"type,omitempty"`
+ }
+
+ // Root
+ type Root struct {
+
+ // the primitive tested in the test file
+ Algorithm string `json:"algorithm,omitempty"`
+
+ // the version of the test vectors.
+ GeneratorVersion string `json:"generatorVersion,omitempty"`
+
+ // additional documentation
+ Header []string `json:"header,omitempty"`
+
+ // a description of the labels used in the test vectors
+ Notes *Notes `json:"notes,omitempty"`
+
+ // the number of test vectors in this test
+ NumberOfTests int `json:"numberOfTests,omitempty"`
+ Schema interface{} `json:"schema,omitempty"`
+ TestGroups []*AeadTestGroup `json:"testGroups,omitempty"`
+ }
+
+ testAeadSealOpen := func(t *testing.T, aead cipher.AEAD, tv *AeadTestVector, recoverBadNonce func()) {
+ defer recoverBadNonce()
+
+ // Encrypt the message, then decrypt the new ciphertext and validate
+ // the decrypted message.
+ ciphertext := aead.Seal(nil, decodeHex(tv.Iv), decodeHex(tv.Msg), decodeHex(tv.Aad))
+ msg, err := aead.Open(nil, decodeHex(tv.Iv), ciphertext, decodeHex(tv.Aad))
+ if err != nil {
+ t.Fatalf("#%d: decryption failed: %v", tv.TcId, err)
+ }
+ if got, want := hex.EncodeToString(msg), tv.Msg; got != want {
+ t.Errorf("#%d: bad message after encrypting and decrypting: %s, want %v", tv.TcId, got, want)
+ }
+
+ // Decrypt the provided ciphertext and validate the decrypted message.
+ tv.Ct += tv.Tag // append the tag to the ciphertext
+ msg2, err := aead.Open(nil, decodeHex(tv.Iv), decodeHex(tv.Ct), decodeHex(tv.Aad))
+ wantPass := shouldPass(tv.Result, tv.Flags, nil)
+ if wantPass {
+ if err != nil {
+ t.Errorf("#%d, type: %s, comment: %q, decryption wanted success, got err: %v", tv.TcId, tv.Result, tv.Comment, err)
+ }
+ if got, want := hex.EncodeToString(ciphertext), tv.Ct; got != want {
+ t.Errorf("#%d: ciphertext doesn't match: %s, want=%s", tv.TcId, got, want)
+ }
+ if got, want := hex.EncodeToString(msg2), tv.Msg; got != want {
+ t.Errorf("#%d: bad message after decrypting ciphertext: %s, want %v", tv.TcId, got, want)
+ }
+ } else {
+ if err == nil {
+ t.Errorf("#%d, type: %s, comment: %q, decryption wanted error", tv.TcId, tv.Result, tv.Comment)
+ }
+ }
+ }
+
+ var root Root
+ readTestVector(t, "chacha20_poly1305_test.json", &root)
+ for _, tg := range root.TestGroups {
+ for _, tv := range tg.Tests {
+ aead, err := chacha20poly1305.New(decodeHex(tv.Key))
+ if err != nil {
+ t.Fatalf("#%d: %v", tv.TcId, err)
+ }
+ if tg.TagSize/8 != aead.Overhead() {
+ t.Fatalf("#%d: bad tag length", tv.TcId)
+ }
+ testAeadSealOpen(t, aead, tv, func() {
+ // A bad nonce causes a panic in AEAD.Seal and AEAD.Open,
+ // so should be recovered. Fail the test if it broke for
+ // some other reason.
+ if r := recover(); r != nil {
+ if tg.IvSize/8 == chacha20poly1305.NonceSize {
+ t.Errorf("#%d: unexpected panic", tv.TcId)
+ }
+ }
+ })
+ }
+ }
+}
