stupidgcm: deduplicate tests 1/2

Pull the code shared between chacha and gcm into
generic functions.
This commit is contained in:
Jakob Unterwurzacher 2021-09-02 09:57:06 +02:00
parent c9b090770a
commit 676a4ceb87
3 changed files with 167 additions and 230 deletions

View File

@ -0,0 +1,152 @@
package stupidgcm
import (
"bytes"
"crypto/cipher"
"encoding/hex"
"testing"
)
// testEncryptDecrypt encrypts and decrypts using both stupidgcm and Go's built-in
// GCM implementation and verifies that the results are identical.
func testEncryptDecrypt(t *testing.T, c1 cipher.AEAD, c2 cipher.AEAD) {
if c1.NonceSize() != c2.NonceSize() {
t.Fatal("different NonceSize")
}
if c1.Overhead() != c2.Overhead() {
t.Fatal("different Overhead")
}
authData := randBytes(24)
iv := randBytes(c1.NonceSize())
dst := make([]byte, 71) // 71 = arbitrary length
// Check all block sizes from 1 to 5000
for i := 1; i < 5000; i++ {
in := make([]byte, i)
c1out := c1.Seal(dst, iv, in, authData)
c2out := c2.Seal(dst, iv, in, authData)
// Ciphertext must be identical to Go GCM
if !bytes.Equal(c1out, c2out) {
t.Fatalf("Compare failed for encryption, size %d", i)
t.Log("c1out:")
t.Log("\n" + hex.Dump(c1out))
t.Log("c2out:")
t.Log("\n" + hex.Dump(c2out))
}
c1out2, sErr := c1.Open(dst, iv, c1out[len(dst):], authData)
if sErr != nil {
t.Fatal(sErr)
}
c2out2, gErr := c2.Open(dst, iv, c2out[len(dst):], authData)
if gErr != nil {
t.Fatal(gErr)
}
// Plaintext must be identical to Go GCM
if !bytes.Equal(c1out2, c2out2) {
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 testInplaceSeal(t *testing.T, c1 cipher.AEAD, c2 cipher.AEAD) {
authData := randBytes(24)
iv := randBytes(c1.NonceSize())
max := 5016
// Check all block sizes from 1 to 5000
for i := 1; i < max-16; i++ {
in := make([]byte, i)
dst := make([]byte, max-i)
dst = dst[:16]
c1out := c1.Seal(dst, iv, in, authData)
dst2 := make([]byte, 16)
c2out := c2.Seal(dst2, iv, in, authData)
// Ciphertext must be identical to Go GCM
if !bytes.Equal(c1out, c2out) {
t.Fatalf("Compare failed for encryption, size %d", i)
t.Log("sOut:")
t.Log("\n" + hex.Dump(c1out))
t.Log("gOut:")
t.Log("\n" + hex.Dump(c2out))
}
}
}
// testInplaceOpen - 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 testInplaceOpen(t *testing.T, c1 cipher.AEAD, c2 cipher.AEAD) {
authData := randBytes(24)
iv := randBytes(c1.NonceSize())
max := 5016
// Check all block sizes from 1 to 5000
for i := 1; i < max-c1.NonceSize(); i++ {
in := make([]byte, i)
c2ciphertext := c2.Seal(iv, iv, in, authData)
dst := make([]byte, max-i)
// sPlaintext ... stupidgcm plaintext
c1plaintext, err := c1.Open(dst[:0], iv, c2ciphertext[c1.NonceSize():], authData)
if err != nil {
t.Fatal(err)
}
// Plaintext must be identical to Go GCM
if !bytes.Equal(in, c1plaintext) {
t.Fatalf("Compare failed, i=%d", i)
}
}
}
// testCorruption verifies that changes in the ciphertext result in a decryption
// error
func testCorruption(t *testing.T, c cipher.AEAD) {
authData := randBytes(24)
iv := randBytes(c.NonceSize())
in := make([]byte, 354)
out := c.Seal(nil, iv, in, authData)
out2, sErr := c.Open(nil, iv, out, authData)
if sErr != nil {
t.Fatal(sErr)
}
if !bytes.Equal(in, out2) {
t.Fatalf("Compare failed")
}
// Corrupt first byte
out[0]++
out2, sErr = c.Open(nil, iv, out, authData)
if sErr == nil || out2 != nil {
t.Fatalf("Should have gotten error")
}
out[0]--
// Corrupt last byte
out[len(out)-1]++
out2, sErr = c.Open(nil, iv, out, authData)
if sErr == nil || out2 != nil {
t.Fatalf("Should have gotten error")
}
out[len(out)-1]--
// Append one byte
out = append(out, 0)
out2, sErr = c.Open(nil, iv, out, authData)
if sErr == nil || out2 != nil {
t.Fatalf("Should have gotten error")
}
}

View File

@ -6,8 +6,6 @@
package stupidgcm
import (
"bytes"
"encoding/hex"
"testing"
"golang.org/x/crypto/chacha20poly1305"
@ -17,46 +15,13 @@ import (
// 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)
c := newChacha20poly1305(key)
ref, 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)
}
}
testEncryptDecrypt(t, c, ref)
}
// Seal re-uses the "dst" buffer it is large enough.
@ -64,34 +29,13 @@ func TestEncryptDecryptChacha(t *testing.T) {
// 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)
c := newChacha20poly1305(key)
ref, 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))
}
}
testInplaceSeal(t, c, ref)
}
// Open re-uses the "dst" buffer it is large enough.
@ -99,73 +43,20 @@ func TestInplaceSealChacha(t *testing.T) {
// 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)
c := newChacha20poly1305(key)
ref, 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)
}
}
testInplaceOpen(t, c, ref)
}
// 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())
c := newChacha20poly1305(key)
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")
}
testCorruption(t, c)
}

View File

@ -6,11 +6,9 @@
package stupidgcm
import (
"bytes"
"crypto/aes"
"crypto/cipher"
"crypto/rand"
"encoding/hex"
"log"
"testing"
)
@ -30,9 +28,6 @@ func randBytes(n int) []byte {
func TestEncryptDecrypt(t *testing.T) {
key := randBytes(32)
sGCM := New(key, false)
authData := randBytes(24)
iv := randBytes(16)
dst := make([]byte, 71) // 71 = random length
gAES, err := aes.NewCipher(key)
if err != nil {
@ -43,36 +38,7 @@ func TestEncryptDecrypt(t *testing.T) {
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)
}
}
testEncryptDecrypt(t, sGCM, gGCM)
}
// Seal re-uses the "dst" buffer it is large enough.
@ -81,8 +47,6 @@ func TestEncryptDecrypt(t *testing.T) {
func TestInplaceSeal(t *testing.T) {
key := randBytes(32)
sGCM := New(key, false)
authData := randBytes(24)
iv := randBytes(16)
gAES, err := aes.NewCipher(key)
if err != nil {
@ -92,26 +56,8 @@ func TestInplaceSeal(t *testing.T) {
if err != nil {
t.Fatal(err)
}
max := 5016
// Check all block sizes from 1 to 5000
for i := 1; i < max-16; i++ {
in := make([]byte, i)
dst := make([]byte, max-i)
dst = dst[:16]
sOut := sGCM.Seal(dst, iv, in, authData)
dst2 := make([]byte, 16)
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))
}
}
testInplaceSeal(t, sGCM, gGCM)
}
// Open re-uses the "dst" buffer it is large enough.
@ -120,8 +66,6 @@ func TestInplaceSeal(t *testing.T) {
func TestInplaceOpen(t *testing.T) {
key := randBytes(32)
sGCM := New(key, false)
authData := randBytes(24)
iv := randBytes(16)
gAES, err := aes.NewCipher(key)
if err != nil {
@ -131,25 +75,8 @@ func TestInplaceOpen(t *testing.T) {
if err != nil {
t.Fatal(err)
}
max := 5016
// Check all block sizes from 1 to 5000
for i := 1; i < max-16; 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[16:], 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)
}
}
testInplaceOpen(t, sGCM, gGCM)
}
// TestCorruption verifies that changes in the ciphertext result in a decryption
@ -157,39 +84,6 @@ func TestInplaceOpen(t *testing.T) {
func TestCorruption(t *testing.T) {
key := randBytes(32)
sGCM := New(key, false)
authData := randBytes(24)
iv := randBytes(16)
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")
}
testCorruption(t, sGCM)
}