コード例 #1
0
ファイル: DpapiCryptographer.cs プロジェクト: bnantz/NCS-V1-1
        private byte[] EncryptInternal(byte[] plaintext, byte[] entropy)
        {
            NativeMethods.DataBlob plainTextBlob = new NativeMethods.DataBlob();
            NativeMethods.DataBlob cipherBlob = new NativeMethods.DataBlob();
            NativeMethods.DataBlob entropyBlob = new NativeMethods.DataBlob();

            //BUG:  possible bug here, do we need to clean up the prompt struct?
            //  don't think so, but check...
            NativeMethods.CryptProtectPromptStruct prompt = new NativeMethods.CryptProtectPromptStruct();
            InitPromptstruct(ref prompt);

            int flags;
            byte[] cipherText = null;

            try
            {
                plainTextBlob.DataPointer = Marshal.AllocHGlobal(plaintext.Length);

                plainTextBlob.Size = plaintext.Length;
                Marshal.Copy(plaintext, 0, plainTextBlob.DataPointer, plaintext.Length);

                if (DpapiStorageMode.Machine == storeMode)
                {
                    // Using the machine store, should be providing entropy.
                    flags = CryptProtectLocalMachine | CryptProtectUIForbidden;

                    entropyBlob.DataPointer = Marshal.AllocHGlobal(entropy.Length);

                    Marshal.Copy(entropy, 0, entropyBlob.DataPointer, entropy.Length);
                    entropyBlob.Size = entropy.Length;

                }
                else
                {
                    // Using the user store
                    flags = CryptProtectUIForbidden;
                }

                if (!NativeMethods.CryptProtectData(ref plainTextBlob, String.Empty, ref entropyBlob, IntPtr.Zero, ref prompt, flags, ref cipherBlob))
                {
                    throw new Win32Exception(Marshal.GetLastWin32Error());
                }

                cipherText = new byte[cipherBlob.Size];
                Marshal.Copy(cipherBlob.DataPointer, cipherText, 0, cipherBlob.Size);
            }
            finally
            {
                // Free the blob and entropy.
                if (IntPtr.Zero != cipherBlob.DataPointer)
                {
                    Marshal.FreeHGlobal(cipherBlob.DataPointer);
                }
                if (IntPtr.Zero != entropyBlob.DataPointer)
                {
                    Marshal.FreeHGlobal(entropyBlob.DataPointer);
                }
                if (IntPtr.Zero != plainTextBlob.DataPointer)
                {
                    Marshal.FreeHGlobal(plainTextBlob.DataPointer);
                }
            }

            return cipherText;
        }
コード例 #2
0
        private byte[] DecryptInternal(byte[] cipherText, byte[] entropy)
        {
            NativeMethods.DataBlob plainTextBlob = new NativeMethods.DataBlob();
            NativeMethods.DataBlob cipherBlob    = new NativeMethods.DataBlob();
            NativeMethods.DataBlob entropyBlob   = new NativeMethods.DataBlob();

            NativeMethods.CryptProtectPromptStruct prompt = new NativeMethods.CryptProtectPromptStruct();
            InitPromptstruct(ref prompt);

            int flags = 0;

            byte[] plainText = null;

            try
            {
                cipherBlob.DataPointer = Marshal.AllocHGlobal(cipherText.Length);

                cipherBlob.Size = cipherText.Length;
                Marshal.Copy(cipherText, 0, cipherBlob.DataPointer, cipherText.Length);

                if (DpapiStorageMode.Machine == storeMode)
                {
                    // Using the machine store, should be providing entropy.
                    flags = CryptProtectLocalMachine | CryptProtectUIForbidden;

                    entropyBlob.DataPointer = Marshal.AllocHGlobal(entropy.Length);
                    entropyBlob.Size        = entropy.Length;

                    Marshal.Copy(entropy, 0, entropyBlob.DataPointer, entropy.Length);
                }
                else
                {
                    // Using the user store; therefore don't build entropy
                    flags = CryptProtectUIForbidden;
                }

                if (!NativeMethods.CryptUnprotectData(ref cipherBlob, null, ref entropyBlob, IntPtr.Zero, ref prompt, flags, ref plainTextBlob))
                {
                    throw new Win32Exception(Marshal.GetLastWin32Error());
                }

                plainText = new byte[plainTextBlob.Size];
                Marshal.Copy(plainTextBlob.DataPointer, plainText, 0, plainTextBlob.Size);
            }
            finally
            {
                // Free the blob and entropy.
                if (IntPtr.Zero != cipherBlob.DataPointer)
                {
                    Marshal.FreeHGlobal(cipherBlob.DataPointer);
                }
                if (IntPtr.Zero != entropyBlob.DataPointer)
                {
                    Marshal.FreeHGlobal(entropyBlob.DataPointer);
                }
                if (IntPtr.Zero != plainTextBlob.DataPointer)
                {
                    Marshal.FreeHGlobal(plainTextBlob.DataPointer);
                }
            }

            return(plainText);
        }
コード例 #3
0
ファイル: DpapiCryptographer.cs プロジェクト: bnantz/NCS-V1-1
        private byte[] DecryptInternal(byte[] cipherText, byte[] entropy)
        {
            NativeMethods.DataBlob plainTextBlob = new NativeMethods.DataBlob();
            NativeMethods.DataBlob cipherBlob = new NativeMethods.DataBlob();
            NativeMethods.DataBlob entropyBlob = new NativeMethods.DataBlob();

            NativeMethods.CryptProtectPromptStruct prompt = new NativeMethods.CryptProtectPromptStruct();
            InitPromptstruct(ref prompt);

            int flags = 0;
            byte[] plainText = null;

            try
            {
                cipherBlob.DataPointer = Marshal.AllocHGlobal(cipherText.Length);

                cipherBlob.Size = cipherText.Length;
                Marshal.Copy(cipherText, 0, cipherBlob.DataPointer, cipherText.Length);

                if (DpapiStorageMode.Machine == storeMode)
                {
                    // Using the machine store, should be providing entropy.
                    flags = CryptProtectLocalMachine | CryptProtectUIForbidden;

                    entropyBlob.DataPointer = Marshal.AllocHGlobal(entropy.Length);
                    entropyBlob.Size = entropy.Length;

                    Marshal.Copy(entropy, 0, entropyBlob.DataPointer, entropy.Length);

                }
                else
                {
                    // Using the user store; therefore don't build entropy
                    flags = CryptProtectUIForbidden;
                }

                if (!NativeMethods.CryptUnprotectData(ref cipherBlob, null, ref entropyBlob, IntPtr.Zero, ref prompt, flags, ref plainTextBlob))
                {
                    throw new Win32Exception(Marshal.GetLastWin32Error());
                }

                plainText = new byte[plainTextBlob.Size];
                Marshal.Copy(plainTextBlob.DataPointer, plainText, 0, plainTextBlob.Size);
            }
            finally
            {
                // Free the blob and entropy.
                if (IntPtr.Zero != cipherBlob.DataPointer)
                {
                    Marshal.FreeHGlobal(cipherBlob.DataPointer);
                }
                if (IntPtr.Zero != entropyBlob.DataPointer)
                {
                    Marshal.FreeHGlobal(entropyBlob.DataPointer);
                }
                if (IntPtr.Zero != plainTextBlob.DataPointer)
                {
                    Marshal.FreeHGlobal(plainTextBlob.DataPointer);
                }
            }

            return plainText;
        }
コード例 #4
0
        private byte[] EncryptInternal(byte[] plaintext, byte[] entropy)
        {
            NativeMethods.DataBlob plainTextBlob = new NativeMethods.DataBlob();
            NativeMethods.DataBlob cipherBlob    = new NativeMethods.DataBlob();
            NativeMethods.DataBlob entropyBlob   = new NativeMethods.DataBlob();

            //BUG:  possible bug here, do we need to clean up the prompt struct?
            //  don't think so, but check...
            NativeMethods.CryptProtectPromptStruct prompt = new NativeMethods.CryptProtectPromptStruct();
            InitPromptstruct(ref prompt);

            int flags;

            byte[] cipherText = null;

            try
            {
                plainTextBlob.DataPointer = Marshal.AllocHGlobal(plaintext.Length);

                plainTextBlob.Size = plaintext.Length;
                Marshal.Copy(plaintext, 0, plainTextBlob.DataPointer, plaintext.Length);

                if (DpapiStorageMode.Machine == storeMode)
                {
                    // Using the machine store, should be providing entropy.
                    flags = CryptProtectLocalMachine | CryptProtectUIForbidden;

                    entropyBlob.DataPointer = Marshal.AllocHGlobal(entropy.Length);

                    Marshal.Copy(entropy, 0, entropyBlob.DataPointer, entropy.Length);
                    entropyBlob.Size = entropy.Length;
                }
                else
                {
                    // Using the user store
                    flags = CryptProtectUIForbidden;
                }

                if (!NativeMethods.CryptProtectData(ref plainTextBlob, String.Empty, ref entropyBlob, IntPtr.Zero, ref prompt, flags, ref cipherBlob))
                {
                    throw new Win32Exception(Marshal.GetLastWin32Error());
                }

                cipherText = new byte[cipherBlob.Size];
                Marshal.Copy(cipherBlob.DataPointer, cipherText, 0, cipherBlob.Size);
            }
            finally
            {
                // Free the blob and entropy.
                if (IntPtr.Zero != cipherBlob.DataPointer)
                {
                    Marshal.FreeHGlobal(cipherBlob.DataPointer);
                }
                if (IntPtr.Zero != entropyBlob.DataPointer)
                {
                    Marshal.FreeHGlobal(entropyBlob.DataPointer);
                }
                if (IntPtr.Zero != plainTextBlob.DataPointer)
                {
                    Marshal.FreeHGlobal(plainTextBlob.DataPointer);
                }
            }

            return(cipherText);
        }