RSAPKCS1SignatureFormatter.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 / RSAPKCS1SignatureFormatter.cs / 1305376 / RSAPKCS1SignatureFormatter.cs
                        

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

// 
// RSAPKCS1SignatureFormatter.cs
//

namespace System.Security.Cryptography { 
    [System.Runtime.InteropServices.ComVisible(true)]
    public class RSAPKCS1SignatureFormatter : AsymmetricSignatureFormatter { 
        private RSA    _rsaKey; 
        private String _strOID;
 
        //
        // public constructors
        //
 
        public RSAPKCS1SignatureFormatter() {}
 
        public RSAPKCS1SignatureFormatter(AsymmetricAlgorithm key) { 
            if (key == null)
                throw new ArgumentNullException("key"); 
            Contract.EndContractBlock();
            _rsaKey = (RSA) key;
        }
 
        //
        // public methods 
        // 

        public override void SetKey(AsymmetricAlgorithm key) { 
            if (key == null)
                throw new ArgumentNullException("key");
            Contract.EndContractBlock();
            _rsaKey = (RSA) key; 
        }
 
        public override void SetHashAlgorithm(String strName) { 
            _strOID = CryptoConfig.MapNameToOID(strName);
        } 

        [System.Security.SecuritySafeCritical]  // auto-generated
        public override byte[] CreateSignature(byte[] rgbHash) {
            if (rgbHash == null) 
                throw new ArgumentNullException("rgbHash");
            Contract.EndContractBlock(); 
 
            if (_strOID == null)
                throw new CryptographicUnexpectedOperationException(Environment.GetResourceString("Cryptography_MissingOID")); 
            if (_rsaKey == null)
                throw new CryptographicUnexpectedOperationException(Environment.GetResourceString("Cryptography_MissingKey"));

            // Two cases here -- if we are talking to the CSP version or if we are talking to some other RSA provider. 
            if (_rsaKey is RSACryptoServiceProvider) {
                return ((RSACryptoServiceProvider) _rsaKey).SignHash(rgbHash, _strOID); 
            } 
            else {
                byte[] pad = Utils.RsaPkcs1Padding(_rsaKey, CryptoConfig.EncodeOID(_strOID), rgbHash); 
                // Create the signature by applying the private key to the padded buffer we just created.
                return _rsaKey.DecryptValue(pad);
            }
        } 
    }
} 

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

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