internal static extern bool EVP_CipherInit_ex(
SafeEvpCipherCtxHandle ctx,
IntPtr cipher,
IntPtr engineNull,
byte[] key,
byte[] iv,
int enc);
protected override void Dispose(bool disposing)
{
if (disposing)
{
if (_ctx != null)
{
_ctx.Dispose();
_ctx = null;
}
}
base.Dispose(disposing);
}
protected override void Dispose(bool disposing)
{
if (disposing)
{
if (_ctx != null)
{
_ctx.Dispose();
_ctx = null;
}
if (_decryptBuffer != null)
{
Array.Clear(_decryptBuffer, 0, _decryptBuffer.Length);
_decryptBuffer = null;
}
}
base.Dispose(disposing);
}
internal static SafeEvpCipherCtxHandle Create()
{
IntPtr memPtr = IntPtr.Zero;
bool succeeded = false;
SafeEvpCipherCtxHandle safeHandle = null;
try
{
memPtr = Marshal.AllocHGlobal(Interop.libcrypto.EVP_CIPHER_CTX_SIZE);
safeHandle = new SafeEvpCipherCtxHandle();
safeHandle.SetHandle(memPtr);
Interop.libcrypto.EVP_CIPHER_CTX_init(safeHandle);
succeeded = true;
return(safeHandle);
}
finally
{
if (!succeeded)
{
// If we made it to SetHandle, and failed calling EVP_CIPHER_CTX_init
// then OpenSSL hasn't built this object yet, and we shouldn't call
// EVP_CIPHER_CTX_cleanup.
if (safeHandle != null && !safeHandle.IsInvalid)
{
safeHandle.SetHandleAsInvalid();
}
if (memPtr != IntPtr.Zero)
{
Marshal.FreeHGlobal(memPtr);
}
}
}
}
internal static SafeEvpCipherCtxHandle Create()
{
IntPtr memPtr = IntPtr.Zero;
bool succeeded = false;
SafeEvpCipherCtxHandle safeHandle = null;
try
{
memPtr = Marshal.AllocHGlobal(Interop.libcrypto.EVP_CIPHER_CTX_SIZE);
safeHandle = new SafeEvpCipherCtxHandle();
safeHandle.SetHandle(memPtr);
Interop.libcrypto.EVP_CIPHER_CTX_init(safeHandle);
succeeded = true;
return safeHandle;
}
finally
{
if (!succeeded)
{
// If we made it to SetHandle, and failed calling EVP_CIPHER_CTX_init
// then OpenSSL hasn't built this object yet, and we shouldn't call
// EVP_CIPHER_CTX_cleanup.
if (safeHandle != null && !safeHandle.IsInvalid)
{
safeHandle.SetHandleAsInvalid();
}
if (memPtr != IntPtr.Zero)
{
Marshal.FreeHGlobal(memPtr);
}
}
}
}
internal static extern unsafe bool EvpCipherFinalEx(
SafeEvpCipherCtxHandle ctx,
byte* outm,
out int outl);
internal static unsafe extern bool EvpCipherUpdate(
SafeEvpCipherCtxHandle ctx,
byte* @out,
out int outl,
byte* @in,
int inl);
internal static extern bool EvpCipherCtxSetPadding(SafeEvpCipherCtxHandle x, int padding);
internal static extern bool EvpCipherReset(SafeEvpCipherCtxHandle ctx);
private void OpenKey(IntPtr algorithm, byte[] key, int effectiveKeyLength)
{
_ctx = Interop.Crypto.EvpCipherCreate(
algorithm,
key,
key.Length * 8,
effectiveKeyLength,
IV,
_encrypting ? 1 : 0);
Interop.Crypto.CheckValidOpenSslHandle(_ctx);
// OpenSSL will happily do PKCS#7 padding for us, but since we support padding modes
// that it doesn't (PaddingMode.Zeros) we'll just always pad the blocks ourselves.
CheckBoolReturn(Interop.Crypto.EvpCipherCtxSetPadding(_ctx, 0));
}
private void OpenKey(byte[] key, byte[] iv)
{
Func<IntPtr> algorithmFunc = FindAlgorithmSelector(key.Length * 8);
// The algorithm pointer is a static pointer, so not having any cleanup code is correct.
IntPtr algorithm = algorithmFunc();
_ctx = Interop.Crypto.EvpCipherCreate(
algorithm,
key,
iv,
_encryptor ? 1 : 0);
if (_ctx == null)
{
throw Interop.Crypto.CreateOpenSslCryptographicException();
}
// OpenSSL will happily do PKCS#7 padding for us, but since we support padding modes
// that it doesn't (PaddingMode.Zeros) we'll just always pad the blocks ourselves.
bool status = Interop.Crypto.EvpCipherCtxSetPadding(_ctx, 0);
CheckBoolReturn(status);
}
private void OpenKey(byte[] key, byte[] iv)
{
Func<IntPtr> algorithmFunc = FindAlgorithmSelector(key.Length * 8);
_ctx = SafeEvpCipherCtxHandle.Create();
// The algorithm pointer is a static pointer, so not having any cleanup code is correct.
IntPtr algorithm = algorithmFunc();
bool status = Interop.libcrypto.EVP_CipherInit_ex(
_ctx,
algorithm,
IntPtr.Zero,
key,
iv,
_encryptor ? 1 : 0);
CheckBoolReturn(status);
// OpenSSL will happily do PKCS#7 padding for us, but since we support padding modes
// that it doesn't (PaddingMode.Zeros) we'll just always pad the blocks ourselves.
status = Interop.libcrypto.EVP_CIPHER_CTX_set_padding(_ctx, 0);
CheckBoolReturn(status);
}
internal static extern bool EVP_CIPHER_CTX_set_padding(SafeEvpCipherCtxHandle x, int padding);
internal static extern void EVP_CIPHER_CTX_init(SafeEvpCipherCtxHandle ctx);
private void OpenKey(CipherMode cipherMode, byte[] key)
{
// The algorithm pointer is a static pointer, so not having any cleanup code is correct.
IntPtr algorithm;
switch (cipherMode)
{
case CipherMode.CBC:
algorithm = Interop.Crypto.EvpDes3Cbc();
break;
case CipherMode.ECB:
algorithm = Interop.Crypto.EvpDes3Ecb();
break;
default:
// This is what AesCngCryptoTransform::GetCipherAlgorithm throws when it doesn't understand the value.
throw new NotSupportedException();
}
_ctx = Interop.Crypto.EvpCipherCreate(
algorithm,
key,
IV,
_encrypting ? 1 : 0);
if (_ctx == null)
{
throw Interop.Crypto.CreateOpenSslCryptographicException();
}
// OpenSSL will happily do PKCS#7 padding for us, but since we support padding modes
// that it doesn't (PaddingMode.Zeros) we'll just always pad the blocks ourselves.
CheckBoolReturn(Interop.Crypto.EvpCipherCtxSetPadding(_ctx, 0));
}
private void OpenKey(IntPtr algorithm, byte[] key)
{
_ctx = Interop.Crypto.EvpCipherCreate(
algorithm,
key,
IV,
_encrypting ? 1 : 0);
if (_ctx == null)
{
throw Interop.Crypto.CreateOpenSslCryptographicException();
}
// OpenSSL will happily do PKCS#7 padding for us, but since we support padding modes
// that it doesn't (PaddingMode.Zeros) we'll just always pad the blocks ourselves.
CheckBoolReturn(Interop.Crypto.EvpCipherCtxSetPadding(_ctx, 0));
}
