RSAOAEPKeyExchangeFormatter.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 / RSAOAEPKeyExchangeFormatter.cs / 1 / RSAOAEPKeyExchangeFormatter.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 

namespace System.Security.Cryptography { 
    [System.Runtime.InteropServices.ComVisible(true)] 
    public class RSAOAEPKeyExchangeFormatter : AsymmetricKeyExchangeFormatter {
        private byte[] ParameterValue; 
        private RSA _rsaKey;
        private RandomNumberGenerator RngValue;

        // 
        // public constructors
        // 
 
        public RSAOAEPKeyExchangeFormatter() {}
        public RSAOAEPKeyExchangeFormatter(AsymmetricAlgorithm key) { 
            if (key == null)
                throw new ArgumentNullException("key");
            _rsaKey = (RSA) key;
        } 

        // 
        // public properties 
        //
 
        /// 
        public byte[] Parameter {
            get {
                if (ParameterValue != null) 
                    return (byte[]) ParameterValue.Clone();
                return null; 
            } 
            set {
                if (value != null) 
                    ParameterValue = (byte[]) value.Clone();
                else
                    ParameterValue = null;
            } 
        }
 
        ///  
        public override String Parameters {
            get { return null; } 
        }

        public RandomNumberGenerator Rng {
            get { return RngValue; } 
            set { RngValue = value; }
        } 
 
        //
        // public methods 
        //

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

        public override byte[] CreateKeyExchange(byte[] rgbData) { 
            if (_rsaKey == null)
                throw new CryptographicUnexpectedOperationException(Environment.GetResourceString("Cryptography_MissingKey"));

            if (_rsaKey is RSACryptoServiceProvider) { 
                return ((RSACryptoServiceProvider) _rsaKey).Encrypt(rgbData, true);
            } else { 
                return Utils.RsaOaepEncrypt(_rsaKey, SHA1.Create(), new PKCS1MaskGenerationMethod(), RandomNumberGenerator.Create(), rgbData); 
            }
        } 

        public override byte[] CreateKeyExchange(byte[] rgbData, Type symAlgType) {
            return CreateKeyExchange(rgbData);
        } 
    }
}

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