public void SymmetricEncryption_Test_DifferentText_Pass()
{
using (var encryption = new SymmetricEncryption())
{
var encryptionKey = encryption.GenerateRandomNumber(32);
var initializationVector = encryption.GenerateRandomNumber(16);
const string original = "Actual text to encrypt";
const string expected = "Text to compare";
var encrypted = encryption.Encrypt(Encoding.UTF8.GetBytes(original), encryptionKey, initializationVector);
var decrypted = encryption.Decrypt(encrypted, encryptionKey, initializationVector);
string actual = Encoding.UTF8.GetString(decrypted);
Assert.AreNotEqual(expected, actual);
Assert.AreEqual(original, actual);
}
}
public void SymmetricEncryption_Test__DifferentIV_Pass()
{
using (var encryption = new SymmetricEncryption())
{
var encryptionKey = encryption.GenerateRandomNumber(32);
var initializationVector = encryption.GenerateRandomNumber(16);
var otherIV = encryption.GenerateRandomNumber(16);
const string expected = "Text to encrypt";
var encrypted = encryption.Encrypt(Encoding.UTF8.GetBytes(expected), encryptionKey, initializationVector);
var decrypted = encryption.Decrypt(encrypted, encryptionKey, otherIV);
string actual = Encoding.UTF8.GetString(decrypted);
var ex = Assert.Catch <System.Security.Cryptography.CryptographicException>(() => encryption.Decrypt(encrypted, encryptionKey, otherIV));
Assert.AreEqual(ex.Message, "System.Security.Cryptography.CryptographicException : Padding is invalid and cannot be removed.");
}
}
public void EncryptedData_WithDifferentKey_IsNotSuccessfullyDecrypted()
{
// Arrange
var message = "my super secret message";
var key1 = SymmetricEncryption.GenerateKey(32);
var key2 = SymmetricEncryption.GenerateKey(32);
var iv = SymmetricEncryption.GenerateRandomNumber(16);
// Act
var encryptedData = SymmetricEncryption.Encrypt(message, key1, iv);
var decryptedData = SymmetricEncryption.DecryptValue(encryptedData.EncryptedData, key2, iv);
// Assert
Assert.NotEqual(message, decryptedData);
}
public void EncryptedData_WithIv_IsSuccessfullyDecrypted()
{
// Arrange
var message = "my super secret message";
var key = SymmetricEncryption.GenerateKey(32);
var iv = SymmetricEncryption.GenerateRandomNumber(16);
// Act
var encryptedData = SymmetricEncryption.Encrypt(message, key, iv);
var decryptedData = SymmetricEncryption.DecryptValue(encryptedData.EncryptedData, key, iv);
// Assert
Assert.Equal(message, decryptedData);
Assert.Equal("AES", encryptedData.Method);
Assert.NotEqual(encryptedData.EncryptedData, System.Text.Encoding.UTF8.GetBytes(message));
}