RSAPKCS1KeyExchangeDeformatter.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 / RSAPKCS1KeyExchangeDeformatter.cs / 1305376 / RSAPKCS1KeyExchangeDeformatter.cs
                        

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

namespace System.Security.Cryptography { 
    [System.Runtime.InteropServices.ComVisible(true)]
    public class RSAPKCS1KeyExchangeDeformatter : AsymmetricKeyExchangeDeformatter {
        RSA _rsaKey;
        RandomNumberGenerator RngValue; 

        // Constructors 
 
        public RSAPKCS1KeyExchangeDeformatter() {}
 
        public RSAPKCS1KeyExchangeDeformatter(AsymmetricAlgorithm key) {
            if (key == null)
                throw new ArgumentNullException("key");
            Contract.EndContractBlock(); 
            _rsaKey = (RSA) key;
        } 
 
        //
        // public properties 
        //

        public RandomNumberGenerator RNG {
            get { return RngValue; } 
            set { RngValue = value; }
        } 
 
        public override String Parameters {
            get { return null; } 
            set { ;}
        }

        // 
        // public methods
        // 
 
        [System.Security.SecuritySafeCritical]  // auto-generated
        public override byte[] DecryptKeyExchange(byte[] rgbIn) { 
            if (_rsaKey == null)
                throw new CryptographicUnexpectedOperationException(Environment.GetResourceString("Cryptography_MissingKey"));

            byte[] rgbOut; 
            if (_rsaKey is RSACryptoServiceProvider) {
                rgbOut = ((RSACryptoServiceProvider) _rsaKey).Decrypt(rgbIn, false); 
            } 
            else {
                int i; 
                byte[] rgb;
                rgb = _rsaKey.DecryptValue(rgbIn);

                // 
                //  Expected format is:
                //      00 || 02 || PS || 00 || D 
                //      where PS does not contain any zeros. 
                //
 
                for (i = 2; i= rgb.Length) 
                    throw new CryptographicUnexpectedOperationException(Environment.GetResourceString("Cryptography_PKCS1Decoding"));
 
                i++;            // Skip over the zero

                rgbOut = new byte[rgb.Length - i];
                Buffer.InternalBlockCopy(rgb, i, rgbOut, 0, rgbOut.Length); 
            }
            return rgbOut; 
        } 

        public override void SetKey(AsymmetricAlgorithm key) { 
            if (key == null)
                throw new ArgumentNullException("key");
            Contract.EndContractBlock();
            _rsaKey = (RSA) key; 
        }
    } 
} 

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

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