SHA256Cng.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Core / System / Security / Cryptography / SHA256Cng.cs / 1305376 / SHA256Cng.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 

using System; 
using System.Diagnostics.Contracts; 

namespace System.Security.Cryptography { 
    /// 
    ///     Wrapper around the BCrypt implementation of the SHA-256 hashing algorithm
    /// 
    [System.Security.Permissions.HostProtection(MayLeakOnAbort = true)] 
    public sealed class SHA256Cng : SHA256 {
        private BCryptHashAlgorithm m_hashAlgorithm; 
 
        // 
        //  
        // 
        [System.Security.SecurityCritical]
        public SHA256Cng() {
            Contract.Ensures(m_hashAlgorithm != null); 

            m_hashAlgorithm = new BCryptHashAlgorithm(CngAlgorithm.Sha256, 
                                                      BCryptNative.ProviderName.MicrosoftPrimitiveProvider); 
        }
 
        // 
        // 
        // 
        [System.Security.SecurityCritical] 
        protected override void Dispose(bool disposing) {
            try { 
                if (disposing) { 
                    m_hashAlgorithm.Dispose();
                } 
            }
            finally {
                base.Dispose(disposing);
            } 
        }
 
        //  
        // 
        //  
        [System.Security.SecurityCritical]
        public override void Initialize() {
            Contract.Assert(m_hashAlgorithm != null);
            m_hashAlgorithm.Initialize(); 
        }
 
        //  
        // 
        //  
        [System.Security.SecurityCritical]
        protected override void HashCore(byte[] array, int ibStart, int cbSize) {
            Contract.Assert(m_hashAlgorithm != null);
            m_hashAlgorithm.HashCore(array, ibStart, cbSize); 
        }
 
        //  
        // 
        //  
        [System.Security.SecurityCritical]
        protected override byte[] HashFinal() {
            Contract.Assert(m_hashAlgorithm != null);
            return m_hashAlgorithm.HashFinal(); 
        }
    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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