RSAPKCS1KeyExchangeDeformatter.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Security / Cryptography / RSAPKCS1KeyExchangeDeformatter.cs / 1 / RSAPKCS1KeyExchangeDeformatter.cs
                        

                        
                            // ==++== 
//
//   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"); 
            _rsaKey = (RSA) key;
        }

        // 
        // public properties
        // 
 
        public RandomNumberGenerator RNG {
            get { return RngValue; } 
            set { RngValue = value; }
        }

        public override String Parameters { 
            get { return null; }
            set { ;} 
        } 

        // 
        // public methods
        //

        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"); 
            _rsaKey = (RSA) key; 
        }
    } 
}

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