RSAOAEPKeyExchangeFormatter.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 / RSAOAEPKeyExchangeFormatter.cs / 1305376 / RSAOAEPKeyExchangeFormatter.cs

                            using System.Diagnostics.Contracts; 
// ==++==
//
//   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");
            Contract.EndContractBlock(); 
            _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"); 
            Contract.EndContractBlock();
            _rsaKey = (RSA) key;
        }
 
        [System.Security.SecuritySafeCritical]  // auto-generated
        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); 
        }
    }
}

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

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