SHA256CryptoServiceProvider.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 / SHA256CryptoServiceProvider.cs / 1305376 / SHA256CryptoServiceProvider.cs
                        

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

using System; 
using System.Diagnostics.Contracts; 

namespace System.Security.Cryptography { 
    /// 
    ///     Wrapper around the CAPI implementation of the SHA-256 hashing algorithm
    /// 
    [System.Security.Permissions.HostProtection(MayLeakOnAbort = true)] 
    public sealed class SHA256CryptoServiceProvider : SHA256 {
        private CapiHashAlgorithm m_hashAlgorithm; 
 
        // 
        //  
        // 
        [System.Security.SecurityCritical]
        public SHA256CryptoServiceProvider() {
            Contract.Ensures(m_hashAlgorithm != null); 

            m_hashAlgorithm = new CapiHashAlgorithm(CapiNative.ProviderNames.MicrosoftEnhancedRsaAes, 
                                                    CapiNative.ProviderType.RsaAes, 
                                                    CapiNative.AlgorithmId.Sha256);
        } 

        // 
        // 
        //  
        [System.Security.SecurityCritical]
        protected override void Dispose(bool disposing) { 
            try { 
                if (disposing) {
                    m_hashAlgorithm.Dispose(); 
                }
            }
            finally {
                base.Dispose(disposing); 
            }
        } 
 
        /// 
        ///     Reset the hash algorithm to begin hashing a new set of data 
        /// 
        // 
        // 
        //  
        [System.Security.SecurityCritical]
        public override void Initialize() { 
            Contract.Assert(m_hashAlgorithm != null); 
            m_hashAlgorithm.Initialize();
        } 

        /// 
        ///     Hash a block of data
        ///  
        // 
        //  
        //  
        [System.Security.SecurityCritical]
        protected override void HashCore(byte[] array, int ibStart, int cbSize) { 
            Contract.Assert(m_hashAlgorithm != null);
            m_hashAlgorithm.HashCore(array, ibStart, cbSize);
        }
 
        /// 
        ///     Complete the hash, returning its value 
        ///  
        // 
        //  
        // 
        [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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