/// <summary>
/// Encrypts a block of data with cipher mode info specified.
/// </summary>
/// <param name="input">
/// The input to be encrypted.
/// </param>
/// <param name="nonce">
/// Nonce.
/// </param>
/// <param name="authData">
/// Auth data.
/// </param>
/// <param name="tagLength">
/// Length of tag.
/// </param>
/// <param name="tag">
/// Tag.
/// </param>
/// <returns>
/// Encrypted output.
/// </returns>
public byte[] Encrypt(byte[] input, byte[] nonce, byte[] authData, int tagLength, out byte[] tag)
{
if (input == null)
throw new ArgumentNullException("input");
ValidateKeyExists();
tag = new byte[tagLength];
IntPtr pbInfo = IntPtr.Zero;
BcryptAuthenticatedCipherModeInfo info = new BcryptAuthenticatedCipherModeInfo();
try
{
if (nonce != null || authData != null || tagLength > 0)
{
info = new BcryptAuthenticatedCipherModeInfo
{
cbSize = (uint)Marshal.SizeOf(typeof(BcryptAuthenticatedCipherModeInfo)),
dwInfoVersion = 1,
};
if (nonce != null)
{
info.cbNonce = (uint)nonce.Length;
info.pbNonce = Marshal.AllocHGlobal(nonce.Length);
Marshal.Copy(nonce, 0, info.pbNonce, nonce.Length);
}
if (authData != null)
{
info.cbAuthData = (uint)authData.Length;
info.pbAuthData = Marshal.AllocHGlobal(authData.Length);
Marshal.Copy(authData, 0, info.pbAuthData, authData.Length);
}
if (tagLength > 0)
{
info.cbTag = (uint)tagLength;
info.pbTag = Marshal.AllocHGlobal(tagLength);
}
info.pbMacContext = IntPtr.Zero;
info.cbMacContext = 0;
info.cbAAD = 0;
info.cbData = 0;
info.dwFlags = 0;
pbInfo = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(BcryptAuthenticatedCipherModeInfo)));
Marshal.StructureToPtr(info, pbInfo, false);
}
uint cbOutput;
uint status = NativeMethods.BCryptEncrypt(
hKey,
input,
(uint)input.Length,
pbInfo,
null,
0,
null,
0,
out cbOutput,
0);
if (status != (uint)NtStatus.STATUS_SUCCESS)
{
throw new CryptographicException(GetErrorNameFromCode(status));
}
byte[] output = new byte[cbOutput];
status = NativeMethods.BCryptEncrypt(
hKey,
input,
(uint)input.Length,
pbInfo,
null,
0,
output,
cbOutput,
out cbOutput,
0);
if (status != (uint)NtStatus.STATUS_SUCCESS)
{
throw new CryptographicException(GetErrorNameFromCode(status));
}
return output;
}
finally
{
if (pbInfo != IntPtr.Zero)
{
Marshal.Copy(info.pbTag, tag, 0, tagLength);
Marshal.FreeHGlobal(info.pbNonce);
Marshal.FreeHGlobal(info.pbAuthData);
Marshal.FreeHGlobal(info.pbTag);
Marshal.FreeHGlobal(pbInfo);
}
}
}
/// <summary>
/// Encrypts a block of data with cipher mode info specified.
/// </summary>
/// <param name="input">
/// The input to be encrypted.
/// </param>
/// <param name="nonce">
/// Nonce.
/// </param>
/// <param name="authData">
/// Auth data.
/// </param>
/// <param name="tagLength">
/// Length of tag.
/// </param>
/// <param name="tag">
/// Tag.
/// </param>
/// <returns>
/// Encrypted output.
/// </returns>
public byte[] Encrypt(byte[] input, byte[] nonce, byte[] authData, int tagLength, out byte[] tag)
{
if (input == null)
throw new ArgumentNullException("input");
ValidateKeyExists();
tag = new byte[tagLength];
IntPtr pbInfo = IntPtr.Zero;
BcryptAuthenticatedCipherModeInfo info = new BcryptAuthenticatedCipherModeInfo();
try
{
if (nonce != null || authData != null || tagLength > 0)
{
info = new BcryptAuthenticatedCipherModeInfo
{
cbSize = (uint)Marshal.SizeOf(typeof(BcryptAuthenticatedCipherModeInfo)),
dwInfoVersion = 1,
};
if (nonce != null)
{
info.cbNonce = (uint)nonce.Length;
info.pbNonce = Marshal.AllocHGlobal(nonce.Length);
Marshal.Copy(nonce, 0, info.pbNonce, nonce.Length);
}
if (authData != null)
{
info.cbAuthData = (uint)authData.Length;
info.pbAuthData = Marshal.AllocHGlobal(authData.Length);
Marshal.Copy(authData, 0, info.pbAuthData, authData.Length);
}
if (tagLength > 0)
{
info.cbTag = (uint)tagLength;
info.pbTag = Marshal.AllocHGlobal(tagLength);
}
info.pbMacContext = IntPtr.Zero;
info.cbMacContext = 0;
info.cbAAD = 0;
info.cbData = 0;
info.dwFlags = 0;
pbInfo = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(BcryptAuthenticatedCipherModeInfo)));
Marshal.StructureToPtr(info, pbInfo, false);
}
uint cbOutput;
uint status = NativeMethods.BCryptEncrypt(
hKey,
input,
(uint)input.Length,
pbInfo,
null,
0,
null,
0,
out cbOutput,
0);
if (status != (uint)NtStatus.STATUS_SUCCESS)
{
throw new CryptographicException(GetErrorNameFromCode(status));
}
byte[] output = new byte[cbOutput];
status = NativeMethods.BCryptEncrypt(
hKey,
input,
(uint)input.Length,
pbInfo,
null,
0,
output,
cbOutput,
out cbOutput,
0);
if (status != (uint)NtStatus.STATUS_SUCCESS)
{
throw new CryptographicException(GetErrorNameFromCode(status));
}
return output;
}
finally
{
if (pbInfo != IntPtr.Zero)
{
Marshal.Copy(info.pbTag, tag, 0, tagLength);
Marshal.FreeHGlobal(info.pbNonce);
Marshal.FreeHGlobal(info.pbAuthData);
Marshal.FreeHGlobal(info.pbTag);
Marshal.FreeHGlobal(pbInfo);
}
}
}
