public CryptoContainer ValidateDecrypt(CryptoRequest request)
{
CryptoContainer container = null;
if (!request.SkipValidations)
{
container = CryptoContainer.CreateForDecryption(request);
var validationResult = container.ReadAndValidateDataForDecryption();
if (!validationResult.IsValid)
{
throw validationResult.ExceptionToThrow ?? new Exception("Unknown error");
}
request.IV = container.GetIV();
if (request.Password != null)
{
request.Key = container.CalculateKey();
}
}
if (request.Key == null || request.Key.Length != 32)
{
throw new ArgumentException("Key must be 32 bytes long.");
}
if (request.IV == null || request.IV.Length != 16)
{
throw new ArgumentException($"IV must be 16 bytes in length");
}
return(container);
}
/// <summary>
/// Adds additional data to encrypted data. Additional data is not protected, but it isn't added in plain text either.
/// </summary>
/// <param name="encryptedData">The encrypted data to which to add additional data.</param>
/// <param name="additionalData">The additional data to add. Dictionary items where key or value is null or empty will be ignored/</param>
/// <param name="destination">Stream to which to write encrypted data with added additional data</param>
public static void AddAdditionalData(Stream encryptedData, Dictionary <string, string> additionalData, Stream destination)
{
if (additionalData == null)
{
throw new ArgumentNullException(nameof(additionalData));
}
byte[] dataBytes = new AdditionalData(additionalData).GetBytes();
CryptoContainer.WriteAdditionalData(encryptedData, dataBytes, destination);
}
internal static void Decrypt(CryptoRequest request)
{
CryptoContainer container = null;
if (!request.SkipValidations)
{
container = CryptoContainer.CreateForDecryption(request);
var validationResult = container.ReadAndValidateDataForDecryption();
if (!validationResult.IsValid)
{
throw validationResult.ExceptionToThrow ?? new Exception("Unknown error");
}
request.IV = container.GetIV();
if (request.Password != null)
{
request.Key = container.CalculateKey();
}
}
if (request.Key == null || request.Key.Length != 32)
{
throw new ArgumentException("Key must be 32 bytes long.");
}
if (request.IV == null || request.IV.Length != 16)
{
throw new ArgumentException($"IV must be 16 bytes in length");
}
using (var aes = new AesManaged())
{
aes.IV = request.IV;
aes.Key = request.Key;
aes.Padding = PaddingMode.ISO10126;
if (request.SkipValidations)
{
aes.Padding = PaddingMode.PKCS7;
}
aes.BlockSize = 128;
using (var decryptor = aes.CreateDecryptor())
{
CryptoStream cs = new CryptoStream(request.OutData, decryptor, CryptoStreamMode.Write);
int bufferSize = aes.BlockSize;
byte[] buffer = new byte[bufferSize];
int read = 0;
while ((read = request.InData.Read(buffer, 0, bufferSize)) > 0)
{
cs.Write(buffer, 0, read);
cs.Flush();
}
cs.FlushFinalBlock();
}
}
}
internal static void Encrypt(CryptoRequest request)
{
if (request.Key.Length != 32)
{
throw new ArgumentException("Key must be 32 bytes long.");
}
if (request.IV == null || request.IV.Length != 16)
{
throw new ArgumentException("IV must be 16 bytes in length");
}
CryptoContainer container = null;
if (!request.SkipValidations)
{
container = CryptoContainer.CreateForEncryption(request);
container.WriteEmptyHeaderData();
}
using (var aes = new AesManaged())
{
aes.IV = request.IV;
aes.Key = request.Key;
aes.Padding = PaddingMode.ISO10126;
aes.BlockSize = 128;
if (request.SkipValidations)
{
aes.Padding = PaddingMode.PKCS7;
}
using (var encryptor = aes.CreateEncryptor())
{
CryptoStream cs = new CryptoStream(request.OutData, encryptor, CryptoStreamMode.Write);
int bufferSize = aes.BlockSize;
byte[] buffer = new byte[bufferSize];
int read = 0;
while ((read = request.InData.Read(buffer, 0, bufferSize)) > 0)
{
cs.Write(buffer, 0, read);
cs.Flush();
}
cs.FlushFinalBlock();
}
}
if (!request.SkipValidations)
{
container.WriteChecksAndEmbeddedData();
}
}
internal static async Task EncryptAsync(CryptoRequest request)
{
CryptoContainer container = request.ValidateEncryption();
ReportAndCancellationToken token = request.Token ?? new ReportAndCancellationToken();
token.CanReportProgress = request.InData.CanSeek;
using (var aes = GetAes())
using (var encryptor = GetEncryptorAndSetAes(aes, request))
{
int bufferSize = aes.BlockSize;
if (token.CanReportProgress ?? false)
{
token.NumberOfIterations = (int)Math.Ceiling(request.InData.Length / (double)bufferSize);
}
CryptoStream cs = new CryptoStream(request.OutData, encryptor, CryptoStreamMode.Write);
byte[] buffer = new byte[bufferSize];
int read = 0;
int iterationCount = 0;
while ((read = await request.InData.ReadAsync(buffer, 0, bufferSize)) > 0)
{
await cs.WriteAsync(buffer, 0, read);
await cs.FlushAsync();
if (token.IsCanceled)
{
break;
}
iterationCount++;
token.ReportProgressInternal(iterationCount);
}
if (token.IsCanceled)
{
return;
}
cs.FlushFinalBlock();
}
if (!request.SkipValidations)
{
await container.WriteChecksAndEmbeddedDataAsync();
}
}
public CryptoContainer ValidateEncryption()
{
if (Key.Length != 32)
{
throw new ArgumentException("Key must be 32 bytes long.");
}
if (IV == null || IV.Length != 16)
{
throw new ArgumentException("IV must be 16 bytes in length");
}
CryptoContainer container = null;
if (!SkipValidations)
{
container = CryptoContainer.CreateForEncryption(this);
container.WriteEmptyHeaderData();
}
return(container);
}
internal static void Decrypt(CryptoRequest request)
{
CryptoContainer container = request.ValidateDecrypt(request);
ReportAndCancellationToken token = request.Token ?? new ReportAndCancellationToken();
token.CanReportProgress = request.InData.CanSeek;
using (var aes = GetAes())
using (ICryptoTransform decryptor = GetDecryptorAndSetAes(aes, request))
{
int bufferSize = aes.BlockSize;
if (token.CanReportProgress ?? false)
{
token.NumberOfIterations = (int)Math.Ceiling(request.InData.Length / (double)bufferSize);
}
CryptoStream cs = new CryptoStream(request.OutData, decryptor, CryptoStreamMode.Write);
byte[] buffer = new byte[bufferSize];
int read = 0;
int iterationCount = 0;
while ((read = request.InData.Read(buffer, 0, bufferSize)) > 0)
{
cs.Write(buffer, 0, read);
cs.Flush();
if (token.IsCanceled)
{
break;
}
iterationCount++;
token.ReportProgressInternal(iterationCount);
}
if (token.IsCanceled)
{
return;
}
cs.FlushFinalBlock();
}
}
internal static ValidationResult ValidateEncryptedData(CryptoRequest request) => CryptoContainer.CreateForDecryption(request).ReadAndValidateDataForDecryption();
/// <summary>
/// Reads the additional data from encrypted data if present.
/// </summary>
/// <param name="encryptedData">The encrypted data.</param>
/// <returns>Additional data</returns>
public static Dictionary <string, string> ReadAdditionalData(Stream encryptedData)
{
byte[] data = CryptoContainer.ReadAdditionalData(encryptedData);
return(AdditionalData.LoadFromBytes(data).Data);
}
