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Diffstat (limited to 'internal/stupidgcm/stupidchacha_test.go')
-rw-r--r--internal/stupidgcm/stupidchacha_test.go171
1 files changed, 171 insertions, 0 deletions
diff --git a/internal/stupidgcm/stupidchacha_test.go b/internal/stupidgcm/stupidchacha_test.go
new file mode 100644
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--- /dev/null
+++ b/internal/stupidgcm/stupidchacha_test.go
@@ -0,0 +1,171 @@
+// +build !without_openssl
+
+// We compare against Go's built-in GCM implementation. Since stupidgcm only
+// supports 128-bit IVs and Go only supports that from 1.5 onward, we cannot
+// run these tests on older Go versions.
+package stupidgcm
+
+import (
+ "bytes"
+ "encoding/hex"
+ "testing"
+
+ "golang.org/x/crypto/chacha20poly1305"
+)
+
+// TestEncryptDecrypt encrypts and decrypts using both stupidgcm and Go's built-in
+// GCM implementation and verifies that the results are identical.
+func TestEncryptDecryptChacha(t *testing.T) {
+ key := randBytes(32)
+ sGCM := newChacha20poly1305(key)
+ authData := randBytes(24)
+ iv := randBytes(sGCM.NonceSize())
+ dst := make([]byte, 71) // 71 = random length
+
+ gGCM, err := chacha20poly1305.New(key)
+ if err != nil {
+ t.Fatal(err)
+ }
+
+ // Check all block sizes from 1 to 5000
+ for i := 1; i < 5000; i++ {
+ in := make([]byte, i)
+
+ sOut := sGCM.Seal(dst, iv, in, authData)
+ gOut := gGCM.Seal(dst, iv, in, authData)
+
+ // Ciphertext must be identical to Go GCM
+ if !bytes.Equal(sOut, gOut) {
+ t.Fatalf("Compare failed for encryption, size %d", i)
+ t.Log("sOut:")
+ t.Log("\n" + hex.Dump(sOut))
+ t.Log("gOut:")
+ t.Log("\n" + hex.Dump(gOut))
+ }
+
+ sOut2, sErr := sGCM.Open(dst, iv, sOut[len(dst):], authData)
+ if sErr != nil {
+ t.Fatal(sErr)
+ }
+ gOut2, gErr := gGCM.Open(dst, iv, gOut[len(dst):], authData)
+ if gErr != nil {
+ t.Fatal(gErr)
+ }
+
+ // Plaintext must be identical to Go GCM
+ if !bytes.Equal(sOut2, gOut2) {
+ t.Fatalf("Compare failed for decryption, size %d", i)
+ }
+ }
+}
+
+// Seal re-uses the "dst" buffer it is large enough.
+// Check that this works correctly by testing different "dst" capacities from
+// 5000 to 16 and "in" lengths from 1 to 5000.
+func TestInplaceSealChacha(t *testing.T) {
+ key := randBytes(32)
+ sGCM := newChacha20poly1305(key)
+ authData := randBytes(24)
+ iv := randBytes(sGCM.NonceSize())
+
+ gGCM, err := chacha20poly1305.New(key)
+ if err != nil {
+ t.Fatal(err)
+ }
+ max := 5016
+ // Check all block sizes from 1 to 5000
+ for i := 1; i < max-len(iv); i++ {
+ in := make([]byte, i)
+ dst := make([]byte, max-i)
+ dst = dst[:len(iv)]
+
+ sOut := sGCM.Seal(dst, iv, in, authData)
+ dst2 := make([]byte, len(iv))
+ gOut := gGCM.Seal(dst2, iv, in, authData)
+
+ // Ciphertext must be identical to Go GCM
+ if !bytes.Equal(sOut, gOut) {
+ t.Fatalf("Compare failed for encryption, size %d", i)
+ t.Log("sOut:")
+ t.Log("\n" + hex.Dump(sOut))
+ t.Log("gOut:")
+ t.Log("\n" + hex.Dump(gOut))
+ }
+ }
+}
+
+// Open re-uses the "dst" buffer it is large enough.
+// Check that this works correctly by testing different "dst" capacities from
+// 5000 to 16 and "in" lengths from 1 to 5000.
+func TestInplaceOpenChacha(t *testing.T) {
+ key := randBytes(32)
+ sGCM := newChacha20poly1305(key)
+ authData := randBytes(24)
+ iv := randBytes(sGCM.NonceSize())
+
+ gGCM, err := chacha20poly1305.New(key)
+ if err != nil {
+ t.Fatal(err)
+ }
+ max := 5016
+ // Check all block sizes from 1 to 5000
+ for i := 1; i < max-len(iv); i++ {
+ in := make([]byte, i)
+
+ gCiphertext := gGCM.Seal(iv, iv, in, authData)
+
+ dst := make([]byte, max-i)
+ // sPlaintext ... stupidgcm plaintext
+ sPlaintext, err := sGCM.Open(dst[:0], iv, gCiphertext[len(iv):], authData)
+ if err != nil {
+ t.Fatal(err)
+ }
+
+ // Plaintext must be identical to Go GCM
+ if !bytes.Equal(in, sPlaintext) {
+ t.Fatalf("Compare failed, i=%d", i)
+ }
+ }
+}
+
+// TestCorruption verifies that changes in the ciphertext result in a decryption
+// error
+func TestCorruptionChacha(t *testing.T) {
+ key := randBytes(32)
+ sGCM := newChacha20poly1305(key)
+ authData := randBytes(24)
+ iv := randBytes(sGCM.NonceSize())
+
+ in := make([]byte, 354)
+ sOut := sGCM.Seal(nil, iv, in, authData)
+ sOut2, sErr := sGCM.Open(nil, iv, sOut, authData)
+ if sErr != nil {
+ t.Fatal(sErr)
+ }
+ if !bytes.Equal(in, sOut2) {
+ t.Fatalf("Compare failed")
+ }
+
+ // Corrupt first byte
+ sOut[0]++
+ sOut2, sErr = sGCM.Open(nil, iv, sOut, authData)
+ if sErr == nil || sOut2 != nil {
+ t.Fatalf("Should have gotten error")
+ }
+ sOut[0]--
+
+ // Corrupt last byte
+ sOut[len(sOut)-1]++
+ sOut2, sErr = sGCM.Open(nil, iv, sOut, authData)
+ if sErr == nil || sOut2 != nil {
+ t.Fatalf("Should have gotten error")
+ }
+ sOut[len(sOut)-1]--
+
+ // Append one byte
+ sOut = append(sOut, 0)
+ sOut2, sErr = sGCM.Open(nil, iv, sOut, authData)
+ if sErr == nil || sOut2 != nil {
+ t.Fatalf("Should have gotten error")
+ }
+}