ICspAsymmetricAlgorithm.cs source code in C# .NET

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                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / Security / Cryptography / ICspAsymmetricAlgorithm.cs / 1305376 / ICspAsymmetricAlgorithm.cs
                        
                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
// [....]
// 
 
//
// ICspAsymmetricAlgorithm.cs 
//

namespace System.Security.Cryptography {
    using System.Security.AccessControl; 
    using System.Security.Permissions;
 
    [Serializable] 
    [System.Runtime.InteropServices.ComVisible(true)]
    public enum KeyNumber { 
        Exchange  = 1,
        Signature = 2
    }
 
    [System.Runtime.InteropServices.ComVisible(true)]
    public sealed class CspKeyContainerInfo { 
        private CspParameters m_parameters; 
        private bool m_randomKeyContainer;
 
        private CspKeyContainerInfo () {}
        [System.Security.SecurityCritical]  // auto-generated
        internal CspKeyContainerInfo (CspParameters parameters, bool randomKeyContainer) {
            KeyContainerPermission kp = new KeyContainerPermission(KeyContainerPermissionFlags.NoFlags); 
            KeyContainerPermissionAccessEntry entry = new KeyContainerPermissionAccessEntry(parameters, KeyContainerPermissionFlags.Open);
            kp.AccessEntries.Add(entry); 
            kp.Demand(); 

            m_parameters = new CspParameters(parameters); 
            if (m_parameters.KeyNumber == -1) {
                if (m_parameters.ProviderType == Constants.PROV_RSA_FULL || m_parameters.ProviderType == Constants.PROV_RSA_AES)
                    m_parameters.KeyNumber = Constants.AT_KEYEXCHANGE;
                else if (m_parameters.ProviderType == Constants.PROV_DSS_DH) 
                    m_parameters.KeyNumber = Constants.AT_SIGNATURE;
            } 
            m_randomKeyContainer = randomKeyContainer; 
        }
 
        [System.Security.SecuritySafeCritical]  // auto-generated
        public CspKeyContainerInfo (CspParameters parameters) : this (parameters, false) {}

        public bool MachineKeyStore { 
            get {
                return (m_parameters.Flags & CspProviderFlags.UseMachineKeyStore) == CspProviderFlags.UseMachineKeyStore ? true : false; 
            } 
        }
 
        public string ProviderName {
            get {
                return m_parameters.ProviderName;
            } 
        }
 
        public int ProviderType { 
            get {
                return m_parameters.ProviderType; 
            }
        }

        public string KeyContainerName { 
            get {
                return m_parameters.KeyContainerName; 
            } 
        }
 
        public string UniqueKeyContainerName {
            [System.Security.SecuritySafeCritical]  // auto-generated
            get {
                SafeProvHandle safeProvHandle = SafeProvHandle.InvalidHandle; 
                int hr = Utils._OpenCSP(m_parameters, Constants.CRYPT_SILENT, ref safeProvHandle);
                if (hr != Constants.S_OK) 
                    throw new CryptographicException(Environment.GetResourceString("Cryptography_CSP_NotFound")); 

                string uniqueContainerName = (string) Utils._GetProviderParameter(safeProvHandle, m_parameters.KeyNumber, Constants.CLR_UNIQUE_CONTAINER); 
                safeProvHandle.Dispose();
                return uniqueContainerName;
            }
        } 

        public KeyNumber KeyNumber { 
            get { 
                return (KeyNumber) m_parameters.KeyNumber;
            } 
        }

        public bool Exportable {
            [System.Security.SecuritySafeCritical]  // auto-generated 
            get {
                // Assume hardware keys are not exportable. 
                if (this.HardwareDevice) 
                    return false;
 
                SafeProvHandle safeProvHandle = SafeProvHandle.InvalidHandle;
                int hr = Utils._OpenCSP(m_parameters, Constants.CRYPT_SILENT, ref safeProvHandle);
                if (hr != Constants.S_OK)
                    throw new CryptographicException(Environment.GetResourceString("Cryptography_CSP_NotFound")); 

                byte[] isExportable = (byte[]) Utils._GetProviderParameter(safeProvHandle, m_parameters.KeyNumber, Constants.CLR_EXPORTABLE); 
                safeProvHandle.Dispose(); 
                return (isExportable[0] == 1);
            } 
        }

        public bool HardwareDevice {
            [System.Security.SecuritySafeCritical]  // auto-generated 
            get {
                SafeProvHandle safeProvHandle = SafeProvHandle.InvalidHandle; 
                CspParameters parameters = new CspParameters(m_parameters); 
                parameters.KeyContainerName = null;
                parameters.Flags = (parameters.Flags & CspProviderFlags.UseMachineKeyStore) != 0 ? CspProviderFlags.UseMachineKeyStore : 0; 
                uint flags = Constants.CRYPT_VERIFYCONTEXT;
                int hr = Utils._OpenCSP(parameters, flags, ref safeProvHandle);
                if (hr != Constants.S_OK)
                    throw new CryptographicException(Environment.GetResourceString("Cryptography_CSP_NotFound")); 

                byte[] isHardwareDevice = (byte[]) Utils._GetProviderParameter(safeProvHandle, parameters.KeyNumber, Constants.CLR_HARDWARE); 
                safeProvHandle.Dispose(); 
                return (isHardwareDevice[0] == 1);
            } 
        }

        public bool Removable {
            [System.Security.SecuritySafeCritical]  // auto-generated 
            get {
                SafeProvHandle safeProvHandle = SafeProvHandle.InvalidHandle; 
                CspParameters parameters = new CspParameters(m_parameters); 
                parameters.KeyContainerName = null;
                parameters.Flags = (parameters.Flags & CspProviderFlags.UseMachineKeyStore) != 0 ? CspProviderFlags.UseMachineKeyStore : 0; 
                uint flags = Constants.CRYPT_VERIFYCONTEXT;
                int hr = Utils._OpenCSP(parameters, flags, ref safeProvHandle);
                if (hr != Constants.S_OK)
                    throw new CryptographicException(Environment.GetResourceString("Cryptography_CSP_NotFound")); 

                byte[] isRemovable = (byte[]) Utils._GetProviderParameter(safeProvHandle, parameters.KeyNumber, Constants.CLR_REMOVABLE); 
                safeProvHandle.Dispose(); 
                return (isRemovable[0] == 1);
            } 
        }

        public bool Accessible {
            [System.Security.SecuritySafeCritical]  // auto-generated 
            get {
                // This method will pop-up a UI for hardware keys. 
                SafeProvHandle safeProvHandle = SafeProvHandle.InvalidHandle; 
                int hr = Utils._OpenCSP(m_parameters, Constants.CRYPT_SILENT, ref safeProvHandle);
                if (hr != Constants.S_OK) 
                    return false;

                byte[] isAccessible = (byte[]) Utils._GetProviderParameter(safeProvHandle, m_parameters.KeyNumber, Constants.CLR_ACCESSIBLE);
                safeProvHandle.Dispose(); 
                return (isAccessible[0] == 1);
            } 
        } 

        public bool Protected { 
            [System.Security.SecuritySafeCritical]  // auto-generated
            get {
                // Assume hardware keys are protected.
                if (this.HardwareDevice == true) 
                    return true;
 
                SafeProvHandle safeProvHandle = SafeProvHandle.InvalidHandle; 
                int hr = Utils._OpenCSP(m_parameters, Constants.CRYPT_SILENT, ref safeProvHandle);
                if (hr != Constants.S_OK) 
                    throw new CryptographicException(Environment.GetResourceString("Cryptography_CSP_NotFound"));

                byte[] isProtected = (byte[]) Utils._GetProviderParameter(safeProvHandle, m_parameters.KeyNumber, Constants.CLR_PROTECTED);
                safeProvHandle.Dispose(); 
                return (isProtected[0] == 1);
            } 
        } 

        public CryptoKeySecurity CryptoKeySecurity { 
            [System.Security.SecuritySafeCritical]  // auto-generated
            get {
                KeyContainerPermission kp = new KeyContainerPermission(KeyContainerPermissionFlags.NoFlags);
                KeyContainerPermissionAccessEntry entry = new KeyContainerPermissionAccessEntry(m_parameters, 
                                                                                                KeyContainerPermissionFlags.ChangeAcl |
                                                                                                KeyContainerPermissionFlags.ViewAcl); 
                kp.AccessEntries.Add(entry); 
                kp.Demand();
 
                SafeProvHandle safeProvHandle = SafeProvHandle.InvalidHandle;
                int hr = Utils._OpenCSP(m_parameters, Constants.CRYPT_SILENT, ref safeProvHandle);
                if (hr != Constants.S_OK)
                    throw new CryptographicException(Environment.GetResourceString("Cryptography_CSP_NotFound")); 

                using (safeProvHandle) { 
                    return Utils.GetKeySetSecurityInfo(safeProvHandle, AccessControlSections.All); 
                }
            } 
        }

        public bool RandomlyGenerated {
            get { 
                return m_randomKeyContainer;
            } 
        } 
    }
 
    [System.Runtime.InteropServices.ComVisible(true)]
    public interface ICspAsymmetricAlgorithm {
        CspKeyContainerInfo CspKeyContainerInfo { get; }
 
        byte[] ExportCspBlob (bool includePrivateParameters);
 
        void ImportCspBlob (byte[] rawData); 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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