MD5Cng.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 / MD5Cng.cs / 1305376 / MD5Cng.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 MD5 hashing algorithm
    /// 
    [System.Security.Permissions.HostProtection(MayLeakOnAbort = true)] 
    public sealed class MD5Cng : MD5 {
        private BCryptHashAlgorithm m_hashAlgorithm; 
 
        // 
        //  
        // 
        [System.Security.SecurityCritical]
        public MD5Cng() {
            Contract.Ensures(m_hashAlgorithm != null); 

            if (CryptoConfig.AllowOnlyFipsAlgorithms) { 
                throw new InvalidOperationException(SR.GetString(SR.Cryptography_NonCompliantFIPSAlgorithm)); 
            }
 
            m_hashAlgorithm = new BCryptHashAlgorithm(CngAlgorithm.MD5,
                                                      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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