DSASignatureDeformatter.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 / clr / src / BCL / System / Security / Cryptography / DSASignatureDeformatter.cs / 1305376 / DSASignatureDeformatter.cs
                        

                        
                            using System.Diagnostics.Contracts; 
// ==++==
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// ==--==
// [....] 
// 

// 
// DSASignatureDeformatter.cs
//

namespace System.Security.Cryptography { 
    [System.Runtime.InteropServices.ComVisible(true)]
    public class DSASignatureDeformatter : AsymmetricSignatureDeformatter { 
        DSA    _dsaKey; // DSA Key value to do decrypt operation 
        string _oid;
 
        //
        // public constructors
        //
 
        public DSASignatureDeformatter() {
            // The hash algorithm is always SHA1 
            _oid = CryptoConfig.MapNameToOID("SHA1"); 
        }
 
        public DSASignatureDeformatter(AsymmetricAlgorithm key) : this() {
            if (key == null)
                throw new ArgumentNullException("key");
            Contract.EndContractBlock(); 
            _dsaKey = (DSA) key;
        } 
 
        //
        // public methods 
        //

        public override void SetKey(AsymmetricAlgorithm key) {
            if (key == null) 
                throw new ArgumentNullException("key");
            Contract.EndContractBlock(); 
            _dsaKey = (DSA) key; 
        }
 
        public override void SetHashAlgorithm(string strName) {
            if (CryptoConfig.MapNameToOID(strName) != _oid)
                throw new CryptographicUnexpectedOperationException(Environment.GetResourceString("Cryptography_InvalidOperation"));
        } 

        public override bool VerifySignature(byte[] rgbHash, byte[] rgbSignature) { 
            if (rgbHash == null) 
                throw new ArgumentNullException("rgbHash");
            if (rgbSignature == null) 
                throw new ArgumentNullException("rgbSignature");
            Contract.EndContractBlock();

            if (_dsaKey == null) 
                throw new CryptographicUnexpectedOperationException(Environment.GetResourceString("Cryptography_MissingKey"));
 
            return _dsaKey.VerifySignature(rgbHash, rgbSignature); 
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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