added some files

encrypter/aes_ofb_encrypter_test.go

@@ -0,0 +1,155 @@
+package encrypter
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/rand"
+	. "github.com/didiercrunch/ecrypto/helper"
+	"reflect"
+	"strings"
+	"testing"
+)
+
+func NewMockAESOFBEncrypter() *AESOFBEncrypter {
+	ret := new(AESOFBEncrypter)
+	ret.randomReader = NewMockRandomReader()
+	return ret
+}
+
+func TestCreateSymetricKey(t *testing.T) {
+	c := NewMockAESOFBEncrypter()
+	key, e := c.createSymetricKey(512)
+	if e != nil {
+		t.Error(e)
+	} else if len(key) != 512 {
+		t.Error("bad key lenght")
+	} else if !reflect.DeepEqual(key, NewMockRandomReader().GetRandomBytes(512)) {
+		t.Fail()
+	}
+}
+
+func TestGetCypherBlock(t *testing.T) {
+	c := NewMockAESOFBEncrypter()
+	if c.key != nil {
+		t.Error("expected nil key at this point")
+	}
+	block, err := c.getCypherBlock()
+	if err != nil {
+		t.Error(err)
+	}
+	if block.BlockSize() != 16 {
+		t.Fail()
+	}
+	src := Range(16)
+	dst := make([]byte, 16)
+	expected := []byte{30, 248, 157, 9, 161, 60, 109, 82, 221, 152, 171, 167, 137,
+		239, 177, 191}
+	expectedKey := []byte{73, 233, 188, 33, 31, 118, 98, 81, 66, 120, 254, 85, 138, 36,
+		118, 80, 38, 83, 169, 57, 27, 61, 103, 122, 37, 164, 185, 40, 112, 66, 1, 50}
+
+	block.Encrypt(dst, src)
+	if !reflect.DeepEqual(dst, expected) {
+		t.Error("bad aes encryption", dst)
+	}
+	if !reflect.DeepEqual(c.key, expectedKey) {
+		t.Error("bad key", c.key)
+	}
+}
+
+func TestNewEncrypter(t *testing.T) {
+	c := NewAESOFBEncrypter()
+	if c.randomReader != rand.Reader {
+		t.Fail()
+	}
+}
+
+func TestCreateIV(t *testing.T) {
+	m := NewMockAESOFBEncrypter()
+	b, err := aes.NewCipher([]byte("example key 1234"))
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	iv, err := m.createIV(b)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	expt := NewMockRandomReader().GetRandomBytes(16)
+	if !reflect.DeepEqual(iv, expt) {
+		t.Error("bad iv", iv)
+	}
+}
+
+func TestCreateStreamMode(t *testing.T) {
+	m := NewMockAESOFBEncrypter()
+	if m.iv != nil {
+		t.Error("expected nil iv at first")
+	}
+	b, err := aes.NewCipher([]byte("example key 1234"))
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	_, err = m.createStreamMode(b)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	exptIv := NewMockRandomReader().GetRandomBytes(16)
+	if !reflect.DeepEqual(m.iv, exptIv) {
+		t.Error("bad iv", m.iv, " is not ", exptIv)
+	}
+}
+
+func TestCreateFileHandlerAndCypherBlock(t *testing.T) {
+	m := NewMockAESOFBEncrypter()
+	if m.iv != nil {
+		t.Error("expected nil iv at first")
+	}
+
+	_, err := m.createFileHandlerAndCypherBlock()
+	if err != nil {
+		t.Error(err)
+	}
+	if !reflect.DeepEqual(m.key, NewMockRandomReader().GetRandomBytes(32)) {
+		t.Error("bad key", m.key)
+	}
+	if !reflect.DeepEqual(m.iv, NewMockRandomReader().GetRandomBytes(32 + 16)[32:32+16]) {
+		t.Error("bad iv", m.iv)
+	}
+}
+
+func TestSimpleEncryptReaderToWriter(t *testing.T) {
+	reader := strings.NewReader("some plain text")
+	writer := NewMockIoWriter()
+	m := NewMockAESOFBEncrypter()
+	if err := m.EncryptReaderToWriter(reader, writer); err != nil {
+		t.Error(err)
+	}
+}
+
+func decryptEncryptedTextWithAESAlgorithmAndOFBMode(key, iv, encryptedText []byte) (string, error) {
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return "", err
+	}
+	stream := cipher.NewOFB(block, iv)
+	ret := make([]byte, len(encryptedText))
+	stream.XORKeyStream(ret, encryptedText)
+	return string(ret), nil
+}
+
+func TestEncryptDecrypt(t *testing.T) {
+	reader := strings.NewReader("some plain text")
+	writer := NewMockIoWriter()
+	m := NewMockAESOFBEncrypter()
+	if err := m.EncryptReaderToWriter(reader, writer); err != nil {
+		t.Error(err)
+	}
+	if plaintext2, err := decryptEncryptedTextWithAESAlgorithmAndOFBMode(m.key, m.iv, writer.Bytes()); err != nil {
+		t.Error(err)
+	} else if string(plaintext2) != "some plain text" {
+		t.Error("bad encryption/decryption process")
+	}
+}