Code:
/ WCF / WCF / 3.5.30729.1 / untmp / Orcas / SP / ndp / cdf / src / WCF / infocard / Service / managed / Microsoft / InfoCards / SafeCryptoKeyHandle.cs / 1 / SafeCryptoKeyHandle.cs
//------------------------------------------------------------------------------ // Copyright (c) Microsoft Corporation. All rights reserved. //----------------------------------------------------------------------------- namespace Microsoft.InfoCards { using System; using System.ComponentModel; using System.Globalization; using System.Runtime.InteropServices; using System.Runtime.ConstrainedExecution; using System.Security.Cryptography; using System.Security; using Microsoft.InfoCards.Diagnostics; using IDT=Microsoft.InfoCards.Diagnostics.InfoCardTrace; internal class SafeCryptoKey : IDisposable { // // The plaintextkeyblob structure used to hold the keying information // See http://msdn.microsoft.com/library/default.asp?url=/library/en-us/seccrypto/security/publickeystruc.asp // for details of the structure // [StructLayout(LayoutKind.Explicit, Size=12, CharSet=CharSet.Ansi)] struct BlobHeader { const int PLAINTEXTKEYBLOB = 0x08; const int CUR_BLOB_VERSION = 0x02; const int CALG_AES =0x00006610; [FieldOffset(0)] public byte bType; [FieldOffset(1)] public byte bVersion; [FieldOffset(2)] public UInt16 reserved; [FieldOffset(4)] public UInt32 aiKeyAlg; [FieldOffset(8)] public UInt32 keyLength; public BlobHeader( int keySize ) { bType = PLAINTEXTKEYBLOB; bVersion = CUR_BLOB_VERSION; reserved = 0; aiKeyAlg = CALG_AES; keyLength = (uint)keySize; } } [DllImport( "advapi32.dll", EntryPoint ="CryptSetKeyParam", CharSet = CharSet.Unicode, ExactSpelling = true, SetLastError = true ) ] [SuppressUnmanagedCodeSecurity] private static extern bool CryptSetKeyParam( [In] SafeCryptoKeyHandle hKey, [In] UInt32 dwParam, [In] IntPtr data, [In] UInt32 flags); [DllImport( "advapi32.dll", EntryPoint ="CryptImportKey", CharSet = CharSet.Unicode, ExactSpelling = true, SetLastError = true ) ] [SuppressUnmanagedCodeSecurity] private static extern bool CryptImportKey( [In] SafeRsaProviderHandle hProv, [In] IntPtr pbKeyData, [In] UInt32 dwDataLen, [In] IntPtr hPubKey, [In] UInt32 dwFlags, [Out] out SafeCryptoKeyHandle hKey ); private SafeCryptoKeyHandle m_handle; public SafeCryptoKeyHandle Handle { get { return m_handle; } } unsafe public SafeCryptoKey( SafeRsaProviderHandle provider, byte[] encryptedKey, byte[] iv ) { // // These constants from wincrypt.h // const int KP_IV = 1; const int HEADER_SIZE = 12; IDT.DebugAssert( 32 == encryptedKey.Length , "unexpected key length" ); IDT.DebugAssert( null != provider, "null provider" ); // // The key needs to be prefixed with a standard preamble to make it into a plaintext key blob. // BlobHeader bh = new BlobHeader( encryptedKey.Length ); IDT.DebugAssert( 12 == sizeof( BlobHeader ) , "size of blob header must be 12 bytes" ); int bufferSize = sizeof( BlobHeader ) + encryptedKey.Length; byte* keyBuffer = stackalloc byte[ bufferSize ]; // // Copy the blob header over the first 12 bytes of the keyBuffer // byte* pbh = (byte *)&bh; for( int i = 0; i < HEADER_SIZE; i++ ) { keyBuffer[i] = pbh[i]; } try { ProtectedMemory.Unprotect( encryptedKey, MemoryProtectionScope.SameProcess ); for( int i = 0; i < encryptedKey.Length; i++ ) { keyBuffer[ HEADER_SIZE + i ] = encryptedKey[ i ]; } } finally { ProtectedMemory.Protect( encryptedKey, MemoryProtectionScope.SameProcess ); } if( !CryptImportKey( provider, (IntPtr)keyBuffer, (uint)bufferSize, IntPtr.Zero, 0x00, out m_handle ) ) { Exception e = new Win32Exception( Marshal.GetLastWin32Error() ); IDT.CloseInvalidOutSafeHandle(m_handle); IDT.TraceAndLogException( e ); throw IDT.ThrowHelperError( e ); } // // Setup the iv. // fixed( byte * piv = &iv[0] ) { if( !CryptSetKeyParam( m_handle, KP_IV, (IntPtr) piv, 0 ) ) { int error = Marshal.GetLastWin32Error(); Exception e = new Win32Exception( error ); m_handle.Dispose(); throw IDT.ThrowHelperError( e ); } } } void IDisposable.Dispose() { m_handle.Dispose(); } } // // Summary: // Provides a wrapper over a handle retrieved by CryptImportKey // internal class SafeCryptoKeyHandle : SafeHandle { [DllImport( "advapi32.dll", EntryPoint ="CryptDestroyKey", CharSet = CharSet.Unicode, ExactSpelling = true, SetLastError = true ) ] [SuppressUnmanagedCodeSecurity] [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)] private static extern bool CryptDestroyKey( [In] IntPtr hKey ); private SafeCryptoKeyHandle() : base( IntPtr.Zero, true ) { } public override bool IsInvalid { get { return ( IntPtr.Zero == base.handle ); } } protected override bool ReleaseHandle() { #pragma warning suppress 56523 return CryptDestroyKey( base.handle ); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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