Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Security / Cryptography / cryptoapiTransform.cs / 1 / cryptoapiTransform.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== // // CryptoAPITransform.cs // namespace System.Security.Cryptography { using System.Security.AccessControl; using System.Security.Permissions; [Serializable] internal enum CryptoAPITransformMode { Encrypt = 0, Decrypt = 1 } [System.Runtime.InteropServices.ComVisible(true)] public sealed class CryptoAPITransform : ICryptoTransform { private int BlockSizeValue; private byte[] IVValue; private CipherMode ModeValue; private PaddingMode PaddingValue; private CryptoAPITransformMode encryptOrDecrypt; private byte[] _rgbKey; private byte[] _depadBuffer = null; private SafeKeyHandle _safeKeyHandle; private SafeProvHandle _safeProvHandle; private CryptoAPITransform () {} internal CryptoAPITransform(int algid, int cArgs, int[] rgArgIds, Object[] rgArgValues, byte[] rgbKey, PaddingMode padding, CipherMode cipherChainingMode, int blockSize, int feedbackSize, bool useSalt, CryptoAPITransformMode encDecMode) { int dwValue; byte[] rgbValue; BlockSizeValue = blockSize; ModeValue = cipherChainingMode; PaddingValue = padding; encryptOrDecrypt = encDecMode; // Copy the input args int _cArgs = cArgs; int[] _rgArgIds = new int[rgArgIds.Length]; Array.Copy(rgArgIds, _rgArgIds, rgArgIds.Length); _rgbKey = new byte[rgbKey.Length]; Array.Copy(rgbKey, _rgbKey, rgbKey.Length); Object[] _rgArgValues = new Object[rgArgValues.Length]; // an element of rgArgValues can only be an int or a byte[] for (int j = 0; j < rgArgValues.Length; j++) { if (rgArgValues[j] is byte[]) { byte[] rgbOrig = (byte[]) rgArgValues[j]; byte[] rgbNew = new byte[rgbOrig.Length]; Array.Copy(rgbOrig, rgbNew, rgbOrig.Length); _rgArgValues[j] = rgbNew; continue; } if (rgArgValues[j] is int) { _rgArgValues[j] = (int) rgArgValues[j]; continue; } if (rgArgValues[j] is CipherMode) { _rgArgValues[j] = (int) rgArgValues[j]; continue; } } _safeProvHandle = Utils.AcquireProvHandle(new CspParameters(Constants.PROV_RSA_FULL)); SafeKeyHandle safeKeyHandle = SafeKeyHandle.InvalidHandle; // _ImportBulkKey will check for failures and throw an exception Utils._ImportBulkKey(_safeProvHandle, algid, useSalt, _rgbKey, ref safeKeyHandle); _safeKeyHandle = safeKeyHandle; for (int i=0; ivoid IDisposable.Dispose() { Dispose(true); GC.SuppressFinalize(this); } public void Clear() { ((IDisposable) this).Dispose(); } private void Dispose(bool disposing) { if (disposing) { // we always want to clear out these items clear out _rgbKey if (_rgbKey != null) { Array.Clear(_rgbKey,0,_rgbKey.Length); _rgbKey = null; } if (IVValue != null) { Array.Clear(IVValue,0,IVValue.Length); IVValue = null; } if (_depadBuffer != null) { Array.Clear(_depadBuffer, 0, _depadBuffer.Length); _depadBuffer = null; } } if (_safeKeyHandle != null && !_safeKeyHandle.IsClosed) _safeKeyHandle.Dispose(); if (_safeProvHandle != null && !_safeProvHandle.IsClosed) _safeProvHandle.Dispose(); } // // public properties // public IntPtr KeyHandle { [SecurityPermissionAttribute(SecurityAction.Demand, Flags=SecurityPermissionFlag.UnmanagedCode)] get { return _safeKeyHandle.DangerousGetHandle(); } } public int InputBlockSize { get { return(BlockSizeValue/8); } } public int OutputBlockSize { get { return(BlockSizeValue/8); } } public bool CanTransformMultipleBlocks { get { return(true); } } public bool CanReuseTransform { get { return(true); } } // // public methods // // This routine resets the internal state of the CryptoAPITransform [System.Runtime.InteropServices.ComVisible(false)] public void Reset() { _depadBuffer = null; // just ensure we've called CryptEncrypt with the true flag byte[] temp = null; Utils._EncryptData(_safeKeyHandle, new byte[0], 0, 0, ref temp, 0, PaddingValue, true); } public int TransformBlock(byte[] inputBuffer, int inputOffset, int inputCount, byte[] outputBuffer, int outputOffset) { // Note: special handling required if decrypting & using padding because the padding adds to the end of the last // block, we have to buffer an entire block's worth of bytes in case what I just transformed turns out to be // the last block Then in TransformFinalBlock we strip off the padding. if (inputBuffer == null) throw new ArgumentNullException("inputBuffer"); if (outputBuffer == null) throw new ArgumentNullException("outputBuffer"); if (inputOffset < 0) throw new ArgumentOutOfRangeException("inputOffset", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum")); if ((inputCount <= 0) || (inputCount % InputBlockSize != 0) || (inputCount > inputBuffer.Length)) throw new ArgumentException(Environment.GetResourceString("Argument_InvalidValue")); if ((inputBuffer.Length - inputCount) < inputOffset) throw new ArgumentException(Environment.GetResourceString("Argument_InvalidOffLen")); if (encryptOrDecrypt == CryptoAPITransformMode.Encrypt) { // if we're encrypting we can always push out the bytes because no padding mode // removes bytes during encryption return Utils._EncryptData(_safeKeyHandle, inputBuffer, inputOffset, inputCount, ref outputBuffer, outputOffset, PaddingValue, false); } else { if (PaddingValue == PaddingMode.Zeros || PaddingValue == PaddingMode.None) { // like encryption, if we're using None or Zeros padding on decrypt we can write out all // the bytes. Note that we cannot depad a block partially padded with Zeros because // we can't tell if those zeros are plaintext or pad. return Utils._DecryptData(_safeKeyHandle, inputBuffer, inputOffset, inputCount, ref outputBuffer, outputOffset, PaddingValue, false); } else { // OK, now we're in the special case. Check to see if this is the *first* block we've seen // If so, buffer it and return null zero bytes if (_depadBuffer == null) { _depadBuffer = new byte[InputBlockSize]; // copy the last InputBlockSize bytes to _depadBuffer everything else gets processed and returned int inputToProcess = inputCount - InputBlockSize; Buffer.InternalBlockCopy(inputBuffer, inputOffset+inputToProcess, _depadBuffer, 0, InputBlockSize); return Utils._DecryptData(_safeKeyHandle, inputBuffer, inputOffset, inputToProcess, ref outputBuffer, outputOffset, PaddingValue, false); } else { // we already have a depad buffer, so we need to decrypt that info first & copy it out int r = Utils._DecryptData(_safeKeyHandle, _depadBuffer, 0, _depadBuffer.Length, ref outputBuffer, outputOffset, PaddingValue, false); outputOffset += OutputBlockSize; int inputToProcess = inputCount - InputBlockSize; Buffer.InternalBlockCopy(inputBuffer, inputOffset+inputToProcess, _depadBuffer, 0, InputBlockSize); r = Utils._DecryptData(_safeKeyHandle, inputBuffer, inputOffset, inputToProcess, ref outputBuffer, outputOffset, PaddingValue, false); return (OutputBlockSize + r); } } } } public byte[] TransformFinalBlock(byte[] inputBuffer, int inputOffset, int inputCount) { if (inputBuffer == null) throw new ArgumentNullException("inputBuffer"); if (inputOffset < 0) throw new ArgumentOutOfRangeException("inputOffset", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum")); if ((inputCount < 0) || (inputCount > inputBuffer.Length)) throw new ArgumentException(Environment.GetResourceString("Argument_InvalidValue")); if ((inputBuffer.Length - inputCount) < inputOffset) throw new ArgumentException(Environment.GetResourceString("Argument_InvalidOffLen")); if (encryptOrDecrypt == CryptoAPITransformMode.Encrypt) { // If we're encrypting we can always return what we compute because there's no _depadBuffer byte[] transformedBytes = null; Utils._EncryptData(_safeKeyHandle, inputBuffer, inputOffset, inputCount, ref transformedBytes, 0, PaddingValue, true); Reset(); return transformedBytes; } else { if (inputCount%InputBlockSize != 0) throw new CryptographicException(Environment.GetResourceString("Cryptography_SSD_InvalidDataSize")); if (_depadBuffer == null) { byte[] transformedBytes = null; Utils._DecryptData(_safeKeyHandle, inputBuffer, inputOffset, inputCount, ref transformedBytes, 0, PaddingValue, true); Reset(); return transformedBytes; } else { byte[] temp = new byte[_depadBuffer.Length + inputCount]; Buffer.InternalBlockCopy(_depadBuffer, 0, temp, 0, _depadBuffer.Length); Buffer.InternalBlockCopy(inputBuffer, inputOffset, temp, _depadBuffer.Length, inputCount); byte[] transformedBytes = null; Utils._DecryptData(_safeKeyHandle, temp, 0, temp.Length, ref transformedBytes, 0, PaddingValue, true); Reset(); return transformedBytes; } } } } [Flags, Serializable] [System.Runtime.InteropServices.ComVisible(true)] public enum CspProviderFlags { NoFlags = 0x0000, UseMachineKeyStore = 0x0001, UseDefaultKeyContainer = 0x0002, UseNonExportableKey = 0x0004, UseExistingKey = 0x0008, UseArchivableKey = 0x0010, UseUserProtectedKey = 0x0020, NoPrompt = 0x0040 } [System.Runtime.InteropServices.ComVisible(true)] public sealed class CspParameters { public int ProviderType; public string ProviderName; public string KeyContainerName; public int KeyNumber; private uint m_flags; public CspProviderFlags Flags { get { return (CspProviderFlags) m_flags; } set { uint allFlags = 0x8000007F; // this should change if more values are added to CspProviderFlags uint flags = (uint) value; if ((flags & ~allFlags) != 0) throw new ArgumentException(Environment.GetResourceString("Arg_EnumIllegalVal", (int)value), "value"); m_flags = flags; } } private CryptoKeySecurity m_cryptoKeySecurity; public CryptoKeySecurity CryptoKeySecurity { get { return m_cryptoKeySecurity; } set { m_cryptoKeySecurity = value; } } private SecureString m_keyPassword; public SecureString KeyPassword { get { return m_keyPassword; } set { m_keyPassword = value; // Parent handle and PIN are mutually exclusive. m_parentWindowHandle = IntPtr.Zero; } } private IntPtr m_parentWindowHandle; public IntPtr ParentWindowHandle { get { return m_parentWindowHandle; } set { m_parentWindowHandle = value; // Parent handle and PIN are mutually exclusive. m_keyPassword = null; } } public CspParameters () : this(Constants.PROV_RSA_FULL, null, null) {} public CspParameters (int dwTypeIn) : this(dwTypeIn, null, null) {} public CspParameters (int dwTypeIn, string strProviderNameIn) : this(dwTypeIn, strProviderNameIn, null) {} public CspParameters (int dwTypeIn, string strProviderNameIn, string strContainerNameIn) : this (dwTypeIn, strProviderNameIn, strContainerNameIn, CspProviderFlags.NoFlags) {} public CspParameters (int providerType, string providerName, string keyContainerName, CryptoKeySecurity cryptoKeySecurity, SecureString keyPassword) : this (providerType, providerName, keyContainerName) { m_cryptoKeySecurity = cryptoKeySecurity; m_keyPassword = keyPassword; } public CspParameters (int providerType, string providerName, string keyContainerName, CryptoKeySecurity cryptoKeySecurity, IntPtr parentWindowHandle) : this (providerType, providerName, keyContainerName) { m_cryptoKeySecurity = cryptoKeySecurity; m_parentWindowHandle = parentWindowHandle; } internal CspParameters (int providerType, string providerName, string keyContainerName, CspProviderFlags flags) { ProviderType = providerType; ProviderName = providerName; KeyContainerName = keyContainerName; KeyNumber = -1; Flags = flags; } // copy constructor internal CspParameters (CspParameters parameters) { ProviderType = parameters.ProviderType; ProviderName = parameters.ProviderName; KeyContainerName = parameters.KeyContainerName; KeyNumber = parameters.KeyNumber; Flags = parameters.Flags; m_cryptoKeySecurity = parameters.m_cryptoKeySecurity; m_keyPassword = parameters.m_keyPassword; m_parentWindowHandle = parameters.m_parentWindowHandle; } } }
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