ICspAsymmetricAlgorithm.cs source code in C# .NET

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                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Security / Cryptography / ICspAsymmetricAlgorithm.cs / 1 / 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 () {}
        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.KeyNumber = Constants.AT_KEYEXCHANGE; 
                else if (m_parameters.ProviderType == Constants.PROV_DSS_DH)
                    m_parameters.KeyNumber = Constants.AT_SIGNATURE;
            }
            m_randomKeyContainer = randomKeyContainer; 
        }
 
        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 { 
            get { 
                if (Utils.Win2KCrypto == 0)
                    throw new NotSupportedException(Environment.GetResourceString("NotSupported_Method")); 

                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 {
            get {
                if (Utils.Win2KCrypto == 0)
                    throw new NotSupportedException(Environment.GetResourceString("NotSupported_Method")); 

                // 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 {
            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 = 0; 
                if (Utils.Win2KCrypto == 1)
                    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 { 
            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 = 0;
                if (Utils.Win2KCrypto == 1)
                    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 {
            get { 
                if (Utils.Win2KCrypto == 0) 
                    throw new NotSupportedException(Environment.GetResourceString("NotSupported_Method"));
 
                // 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 { 
            get {
                // Assume hardware keys are protected. 
                if (this.HardwareDevice == true) 
                    return true;
 
                if (Utils.Win2KCrypto == 0)
                    throw new NotSupportedException(Environment.GetResourceString("NotSupported_Method"));

                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 { 
            get { 
                if (Utils.Win2KCrypto == 0)
                    throw new NotSupportedException(Environment.GetResourceString("NotSupported_Method")); 

                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); 
    } 
}

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