internal static CngKey FromXml(string xml)
{
CngKey key;
using (TextReader reader = new StringReader(xml))
{
using (XmlTextReader reader2 = new XmlTextReader(reader))
{
BigInteger integer;
BigInteger integer2;
XPathNavigator navigator = new XPathDocument(reader2).CreateNavigator();
if (!navigator.MoveToFirstChild())
{
throw new ArgumentException(System.SR.GetString("Cryptography_MissingDomainParameters"));
}
CngAlgorithm algorithm = ReadAlgorithm(navigator);
if (!navigator.MoveToNext(XPathNodeType.Element))
{
throw new ArgumentException(System.SR.GetString("Cryptography_MissingPublicKey"));
}
ReadPublicKey(navigator, out integer, out integer2);
key = CngKey.Import(NCryptNative.BuildEccPublicBlob(algorithm.Algorithm, integer, integer2), CngKeyBlobFormat.EccPublicBlob);
}
}
return(key);
}
public override byte[] DeriveKeyTls(ECDiffieHellmanPublicKey otherPartyPublicKey, byte[] prfLabel, byte[] prfSeed)
{
Contract.Ensures(Contract.Result <byte[]>() != null);
if (otherPartyPublicKey == null)
{
throw new ArgumentNullException("otherPartyPublicKey");
}
if (prfLabel == null)
{
throw new ArgumentNullException("prfLabel");
}
if (prfSeed == null)
{
throw new ArgumentNullException("prfSeed");
}
using (SafeNCryptSecretHandle secretAgreement = DeriveSecretAgreementHandle(otherPartyPublicKey))
{
return(NCryptNative.DeriveKeyMaterialTls(
secretAgreement,
prfLabel,
prfSeed,
NCryptNative.SecretAgreementFlags.None));
}
}
public static CngKey Import(byte[] keyBlob, CngKeyBlobFormat format, CngProvider provider)
{
if (keyBlob == null)
{
throw new ArgumentNullException("keyBlob");
}
if (format == null)
{
throw new ArgumentNullException("format");
}
if (provider == null)
{
throw new ArgumentNullException("provider");
}
if (!NCryptNative.NCryptSupported)
{
throw new PlatformNotSupportedException(System.SR.GetString("Cryptography_PlatformNotSupported"));
}
if ((format != CngKeyBlobFormat.EccPublicBlob) && (format != CngKeyBlobFormat.GenericPublicBlob))
{
new KeyContainerPermission(KeyContainerPermissionFlags.Import).Demand();
}
SafeNCryptProviderHandle kspHandle = NCryptNative.OpenStorageProvider(provider.Provider);
return(new CngKey(kspHandle, NCryptNative.ImportKey(kspHandle, keyBlob, format.Format))
{
IsEphemeral = format != CngKeyBlobFormat.OpaqueTransportBlob
});
}
public static CngKey Open(string keyName, CngProvider provider, CngKeyOpenOptions openOptions)
{
if (keyName == null)
{
throw new ArgumentNullException("keyName");
}
if (provider == null)
{
throw new ArgumentNullException("provider");
}
if (!NCryptNative.NCryptSupported)
{
throw new PlatformNotSupportedException(System.SR.GetString("Cryptography_PlatformNotSupported"));
}
KeyContainerPermissionAccessEntry accessEntry = new KeyContainerPermissionAccessEntry(keyName, KeyContainerPermissionFlags.Open)
{
ProviderName = provider.Provider
};
KeyContainerPermission permission = new KeyContainerPermission(KeyContainerPermissionFlags.NoFlags);
permission.AccessEntries.Add(accessEntry);
permission.Demand();
SafeNCryptProviderHandle kspHandle = NCryptNative.OpenStorageProvider(provider.Provider);
return(new CngKey(kspHandle, NCryptNative.OpenKey(kspHandle, keyName, openOptions)));
}
public override byte[] DeriveKeyFromHmac(
ECDiffieHellmanPublicKey otherPartyPublicKey,
HashAlgorithmName hashAlgorithm,
byte[] hmacKey,
byte[] secretPrepend,
byte[] secretAppend)
{
Contract.Ensures(Contract.Result <byte[]>() != null);
if (otherPartyPublicKey == null)
{
throw new ArgumentNullException("otherPartyPublicKey");
}
if (string.IsNullOrEmpty(hashAlgorithm.Name))
{
throw new ArgumentException(SR.GetString(SR.Cryptography_HashAlgorithmNameNullOrEmpty), "hashAlgorithm");
}
using (SafeNCryptSecretHandle secretAgreement = DeriveSecretAgreementHandle(otherPartyPublicKey))
{
NCryptNative.SecretAgreementFlags flags = hmacKey == null ?
NCryptNative.SecretAgreementFlags.UseSecretAsHmacKey :
NCryptNative.SecretAgreementFlags.None;
return(NCryptNative.DeriveKeyMaterialHmac(
secretAgreement,
hashAlgorithm.Name,
hmacKey,
secretPrepend,
secretAppend,
flags));
}
}
private static void SetKeyProperties(SafeNCryptKeyHandle keyHandle, CngKeyCreationParameters creationParameters)
{
if (creationParameters.ExportPolicy.HasValue)
{
NCryptNative.SetProperty(keyHandle, "Export Policy", creationParameters.ExportPolicy.Value, CngPropertyOptions.None | CngPropertyOptions.Persist);
}
if (creationParameters.KeyUsage.HasValue)
{
NCryptNative.SetProperty(keyHandle, "Key Usage", creationParameters.KeyUsage.Value, CngPropertyOptions.None | CngPropertyOptions.Persist);
}
if (creationParameters.ParentWindowHandle != IntPtr.Zero)
{
NCryptNative.SetProperty <IntPtr>(keyHandle, "HWND Handle", creationParameters.ParentWindowHandle, CngPropertyOptions.None);
}
if (creationParameters.UIPolicy != null)
{
NCryptNative.NCRYPT_UI_POLICY ncrypt_ui_policy = new NCryptNative.NCRYPT_UI_POLICY {
dwVersion = 1,
dwFlags = creationParameters.UIPolicy.ProtectionLevel,
pszCreationTitle = creationParameters.UIPolicy.CreationTitle,
pszFriendlyName = creationParameters.UIPolicy.FriendlyName,
pszDescription = creationParameters.UIPolicy.Description
};
NCryptNative.SetProperty <NCryptNative.NCRYPT_UI_POLICY>(keyHandle, "UI Policy", ncrypt_ui_policy, CngPropertyOptions.None | CngPropertyOptions.Persist);
if (creationParameters.UIPolicy.UseContext != null)
{
NCryptNative.SetProperty(keyHandle, "Use Context", creationParameters.UIPolicy.UseContext, CngPropertyOptions.None | CngPropertyOptions.Persist);
}
}
foreach (CngProperty property in creationParameters.ParametersNoDemand)
{
NCryptNative.SetProperty(keyHandle, property.Name, property.Value, property.Options);
}
}
public static CngKey Open(string keyName, CngProvider provider, CngKeyOpenOptions openOptions)
{
Contract.Ensures(Contract.Result <CngKey>() != null);
if (keyName == null)
{
throw new ArgumentNullException("keyName");
}
if (provider == null)
{
throw new ArgumentNullException("provider");
}
// Make sure that NCrypt is supported on this platform
if (!NCryptNative.NCryptSupported)
{
throw new PlatformNotSupportedException(SR.GetString(SR.Cryptography_PlatformNotSupported));
}
// Ensure the user has access to the key name
KeyContainerPermissionAccessEntry access = new KeyContainerPermissionAccessEntry(keyName, KeyContainerPermissionFlags.Open);
access.ProviderName = provider.Provider;
KeyContainerPermission permission = new KeyContainerPermission(KeyContainerPermissionFlags.NoFlags);
permission.AccessEntries.Add(access);
permission.Demand();
// Open the key
SafeNCryptProviderHandle kspHandle = NCryptNative.OpenStorageProvider(provider.Provider);
SafeNCryptKeyHandle keyHandle = NCryptNative.OpenKey(kspHandle, keyName, openOptions);
return(new CngKey(kspHandle, keyHandle));
}
public override byte[] Encrypt(byte[] data, RSAEncryptionPadding padding)
{
if (data == null)
{
throw new ArgumentNullException("data");
}
if (padding == null)
{
throw new ArgumentNullException("padding");
}
if (padding == RSAEncryptionPadding.Pkcs1)
{
return(NCryptNative.EncryptDataPkcs1(KeyHandle, data));
}
else if (padding.Mode == RSAEncryptionPaddingMode.Oaep)
{
return(NCryptNative.EncryptDataOaep(KeyHandle, data, padding.OaepHashAlgorithm.Name));
}
else
{
// no other padding possibilities at present, but we might version independently from more being added.
throw new CryptographicException(SR.GetString(SR.Cryptography_UnsupportedPaddingMode));
};
}
private static void WritePublicKeyValue(XmlWriter writer, CngKey key)
{
Contract.Requires(writer != null);
Contract.Requires(key != null && (key.AlgorithmGroup == CngAlgorithmGroup.ECDsa || key.AlgorithmGroup == CngAlgorithmGroup.ECDiffieHellman));
writer.WriteStartElement(PublicKeyRoot);
byte[] exportedKey = key.Export(CngKeyBlobFormat.EccPublicBlob);
BigInteger x;
BigInteger y;
NCryptNative.UnpackEccPublicBlob(exportedKey, out x, out y);
writer.WriteStartElement(XElement);
writer.WriteAttributeString(ValueAttribute, x.ToString("R", CultureInfo.InvariantCulture));
writer.WriteAttributeString(XsiNamespacePrefix, XsiTypeAttribute, XsiNamespace, XsiTypeAttributeValue);
writer.WriteEndElement(); // </X>
writer.WriteStartElement(YElement);
writer.WriteAttributeString(ValueAttribute, y.ToString("R", CultureInfo.InvariantCulture));
writer.WriteAttributeString(XsiNamespacePrefix, XsiTypeAttribute, XsiNamespace, XsiTypeAttributeValue);
writer.WriteEndElement(); // </Y>
writer.WriteEndElement(); // </PublicKey>
}
public override byte[] SignHash(byte[] hash, HashAlgorithmName hashAlgorithm, RSASignaturePadding padding)
{
if (hash == null)
{
throw new ArgumentNullException("hash");
}
if (String.IsNullOrEmpty(hashAlgorithm.Name))
{
throw new ArgumentException(SR.GetString(SR.Cryptography_HashAlgorithmNameNullOrEmpty), "hashAlgorithm");
}
if (padding == null)
{
throw new ArgumentNullException("padding");
}
// Keep a local copy of the key.
CngKey key = Key;
SafeNCryptKeyHandle keyHandle = key.Handle;
if (padding == RSASignaturePadding.Pkcs1)
{
return(NCryptNative.SignHashPkcs1(keyHandle, hash, hashAlgorithm.Name));
}
else if (padding == RSASignaturePadding.Pss)
{
return(NCryptNative.SignHashPss(keyHandle, hash, hashAlgorithm.Name, hash.Length));
}
else
{
// no other padding possibilities at present, but we might version independently from more being added.
throw new CryptographicException(SR.GetString(SR.Cryptography_UnsupportedPaddingMode));
}
}
public override bool VerifyHash(byte[] hash, byte[] signature, HashAlgorithmName hashAlgorithm, RSASignaturePadding padding)
{
if (hash == null)
{
throw new ArgumentNullException("hash");
}
if (signature == null)
{
throw new ArgumentNullException("signature");
}
if (String.IsNullOrEmpty(hashAlgorithm.Name))
{
throw new ArgumentException(SR.GetString(SR.Cryptography_HashAlgorithmNameNullOrEmpty), "hashAlgorithm");
}
if (padding == null)
{
throw new ArgumentNullException("padding");
}
if (padding == RSASignaturePadding.Pkcs1)
{
return(NCryptNative.VerifySignaturePkcs1(KeyHandle, hash, hashAlgorithm.Name, signature));
}
else if (padding == RSASignaturePadding.Pss)
{
return(NCryptNative.VerifySignaturePss(KeyHandle, hash, hashAlgorithm.Name, hash.Length, signature));
}
else
{
// no other padding possibilities at present, but we might version independently from more being added.
throw new CryptographicException(SR.GetString(SR.Cryptography_UnsupportedPaddingMode));
}
}
public override byte[] SignHash(byte[] hash)
{
if (hash == null)
{
throw new ArgumentNullException("hash");
}
// Make sure we're allowed to sign using this key
KeyContainerPermission permission = Key.BuildKeyContainerPermission(KeyContainerPermissionFlags.Sign);
if (permission != null)
{
permission.Demand();
}
// Now that know we have permission to use this key for signing, pull the key value out, which
// will require unmanaged code permission
new SecurityPermission(SecurityPermissionFlag.UnmanagedCode).Assert();
// This looks odd, but the key handle is actually a duplicate so we need to dispose it
using (SafeNCryptKeyHandle keyHandle = Key.Handle) {
CodeAccessPermission.RevertAssert();
return(NCryptNative.SignHash(keyHandle, hash));
}
}
internal KeyContainerPermission BuildKeyContainerPermission(KeyContainerPermissionFlags flags)
{
KeyContainerPermission permission = null;
if (this.IsEphemeral)
{
return(permission);
}
string keyContainerName = null;
string str2 = null;
try
{
keyContainerName = this.KeyName;
str2 = NCryptNative.GetPropertyAsString(this.m_kspHandle, "Name", CngPropertyOptions.None);
}
catch (CryptographicException)
{
}
if (keyContainerName != null)
{
KeyContainerPermissionAccessEntry accessEntry = new KeyContainerPermissionAccessEntry(keyContainerName, flags)
{
ProviderName = str2
};
permission = new KeyContainerPermission(KeyContainerPermissionFlags.NoFlags);
permission.AccessEntries.Add(accessEntry);
return(permission);
}
return(new KeyContainerPermission(flags));
}
public static bool Exists(string keyName, CngProvider provider, CngKeyOpenOptions options)
{
bool flag2;
if (keyName == null)
{
throw new ArgumentNullException("keyName");
}
if (provider == null)
{
throw new ArgumentNullException("provider");
}
if (!NCryptNative.NCryptSupported)
{
throw new PlatformNotSupportedException(System.SR.GetString("Cryptography_PlatformNotSupported"));
}
using (SafeNCryptProviderHandle handle = NCryptNative.OpenStorageProvider(provider.Provider))
{
using (SafeNCryptKeyHandle handle2 = null)
{
NCryptNative.ErrorCode code = NCryptNative.UnsafeNativeMethods.NCryptOpenKey(handle, out handle2, keyName, 0, options);
bool flag = (code == NCryptNative.ErrorCode.KeyDoesNotExist) || (code == NCryptNative.ErrorCode.NotFound);
if ((code != NCryptNative.ErrorCode.Success) && !flag)
{
throw new CryptographicException((int)code);
}
flag2 = code == NCryptNative.ErrorCode.Success;
}
}
return(flag2);
}
internal static SafeNCryptKeyHandle ImportKeyBlob(
string blobType,
byte[] keyBlob,
string curveName,
SafeNCryptProviderHandle provider)
{
SafeNCryptKeyHandle keyHandle;
var desc = new Interop.BCrypt.BCryptBufferDesc();
var buff = new Interop.BCrypt.BCryptBuffer();
IntPtr descPtr = IntPtr.Zero;
IntPtr buffPtr = IntPtr.Zero;
IntPtr curveNamePtr = IntPtr.Zero;
try
{
curveNamePtr = Marshal.StringToHGlobalUni(curveName);
descPtr = Marshal.AllocHGlobal(Marshal.SizeOf(desc));
buffPtr = Marshal.AllocHGlobal(Marshal.SizeOf(buff));
buff.cbBuffer = (curveName.Length + 1) * 2; // Add 1 for null terminator
buff.BufferType = Interop.BCrypt.NCryptBufferDescriptors.NCRYPTBUFFER_ECC_CURVE_NAME;
buff.pvBuffer = curveNamePtr;
Marshal.StructureToPtr(buff, buffPtr, false);
desc.cBuffers = 1;
desc.pBuffers = buffPtr;
desc.ulVersion = Interop.BCrypt.BCRYPTBUFFER_VERSION;
Marshal.StructureToPtr(desc, descPtr, false);
keyHandle = NCryptNative.ImportKey(
provider,
keyBlob,
blobType,
descPtr);
}
catch (CryptographicException e)
{
if (e.HResult == (int)ErrorCode.NTE_INVALID_PARAMETER)
{
throw new PlatformNotSupportedException(
SR.GetString(SR.Cryptography_CurveNotSupported, curveName),
e);
}
throw;
}
finally
{
Marshal.FreeHGlobal(descPtr);
Marshal.FreeHGlobal(buffPtr);
Marshal.FreeHGlobal(curveNamePtr);
}
return(keyHandle);
}
public override byte[] CreateSignature(byte[] rgbHash)
{
if (rgbHash == null)
{
throw new ArgumentNullException("rgbHash");
}
rgbHash = AdjustHashSizeIfNecessary(rgbHash);
return(NCryptNative.SignHash(KeyHandle, rgbHash, rgbHash.Length * 2));
}
internal static CngKey Import(byte[] keyBlob, string curveName, CngKeyBlobFormat format, CngProvider provider)
{
Contract.Ensures(Contract.Result <CngKey>() != null);
if (keyBlob == null)
{
throw new ArgumentNullException("keyBlob");
}
if (format == null)
{
throw new ArgumentNullException("format");
}
if (provider == null)
{
throw new ArgumentNullException("provider");
}
// Make sure that NCrypt is supported on this platform
if (!NCryptNative.NCryptSupported)
{
throw new PlatformNotSupportedException(SR.GetString(SR.Cryptography_PlatformNotSupported));
}
// If we don't know for sure that the key will be ephemeral, then we need to demand Import
// permission. Since we won't know the name of the key until it's too late, we demand a full Import
// rather than one scoped to the key.
bool safeKeyImport = format == CngKeyBlobFormat.EccPublicBlob ||
format == CngKeyBlobFormat.EccFullPublicBlob ||
format == CngKeyBlobFormat.GenericPublicBlob;
if (!safeKeyImport)
{
new KeyContainerPermission(KeyContainerPermissionFlags.Import).Demand();
}
// Import the key into the KSP
SafeNCryptProviderHandle kspHandle = NCryptNative.OpenStorageProvider(provider.Provider);
SafeNCryptKeyHandle keyHandle;
if (curveName == null)
{
keyHandle = NCryptNative.ImportKey(kspHandle, keyBlob, format.Format);
}
else
{
keyHandle = ECCng.ImportKeyBlob(format.Format, keyBlob, curveName, kspHandle);
}
// Prepare the key for use
CngKey key = new CngKey(kspHandle, keyHandle);
// We can't tell directly if an OpaqueTransport blob imported as an ephemeral key or not
key.IsEphemeral = format != CngKeyBlobFormat.OpaqueTransportBlob;
return(key);
}
public static CngKey Create(CngAlgorithm algorithm, string keyName, CngKeyCreationParameters creationParameters)
{
Contract.Ensures(Contract.Result <CngKey>() != null);
if (algorithm == null)
{
throw new ArgumentNullException("algorithm");
}
if (creationParameters == null)
{
creationParameters = new CngKeyCreationParameters();
}
// Make sure that NCrypt is supported on this platform
if (!NCryptNative.NCryptSupported)
{
throw new PlatformNotSupportedException(SR.GetString(SR.Cryptography_PlatformNotSupported));
}
// If we're not creating an ephemeral key, then we need to ensure the user has access to the key name
if (keyName != null)
{
KeyContainerPermissionAccessEntry access = new KeyContainerPermissionAccessEntry(keyName, KeyContainerPermissionFlags.Create);
access.ProviderName = creationParameters.Provider.Provider;
KeyContainerPermission permission = new KeyContainerPermission(KeyContainerPermissionFlags.NoFlags);
permission.AccessEntries.Add(access);
permission.Demand();
}
//
// Create the native handles representing the new key, setup the creation parameters on it, and
// finalize it for use.
//
SafeNCryptProviderHandle kspHandle = NCryptNative.OpenStorageProvider(creationParameters.Provider.Provider);
SafeNCryptKeyHandle keyHandle = NCryptNative.CreatePersistedKey(kspHandle,
algorithm.Algorithm,
keyName,
creationParameters.KeyCreationOptions);
SetKeyProperties(keyHandle, creationParameters);
NCryptNative.FinalizeKey(keyHandle);
CngKey key = new CngKey(kspHandle, keyHandle);
// No name translates to an ephemeral key
if (keyName == null)
{
key.IsEphemeral = true;
}
return(key);
}
public void Delete()
{
KeyContainerPermission permission = this.BuildKeyContainerPermission(KeyContainerPermissionFlags.Delete);
if (permission != null)
{
permission.Demand();
}
NCryptNative.DeleteKey(this.m_keyHandle);
this.Dispose();
}
public bool HasProperty(string name, CngPropertyOptions options)
{
bool flag;
if (name == null)
{
throw new ArgumentNullException("name");
}
NCryptNative.GetProperty(this.m_keyHandle, name, options, out flag);
return(flag);
}
internal string GetCurveName()
{
if (IsECNamedCurve())
{
return(NCryptNative.GetPropertyAsString(
m_keyHandle,
KeyPropertyName.ECCCurveName,
CngPropertyOptions.None));
}
// Use hard-coded values (for use with pre-Win10 APIs)
return(GetECSpecificCurveName());
}
public byte[] Export(CngKeyBlobFormat format)
{
if (format == null)
{
throw new ArgumentNullException("format");
}
KeyContainerPermission permission = this.BuildKeyContainerPermission(KeyContainerPermissionFlags.Export);
if (permission != null)
{
permission.Demand();
}
return(NCryptNative.ExportKey(this.m_keyHandle, format.Format));
}
public bool HasProperty(string name, CngPropertyOptions options)
{
Contract.Assert(m_keyHandle != null);
if (name == null)
{
throw new ArgumentNullException("name");
}
bool foundProperty;
NCryptNative.GetProperty(m_keyHandle, name, options, out foundProperty);
return(foundProperty);
}
public CngProperty GetProperty(string name, CngPropertyOptions options)
{
bool flag;
if (name == null)
{
throw new ArgumentNullException("name");
}
byte[] buffer = NCryptNative.GetProperty(this.m_keyHandle, name, options, out flag);
if (!flag)
{
throw new CryptographicException(-2146893807);
}
return(new CngProperty(name, buffer, options));
}
public static CngKey Open(SafeNCryptKeyHandle keyHandle, CngKeyHandleOpenOptions keyHandleOpenOptions)
{
if (keyHandle == null)
{
throw new ArgumentNullException("keyHandle");
}
if (keyHandle.IsClosed || keyHandle.IsInvalid)
{
throw new ArgumentException(System.SR.GetString("Cryptography_OpenInvalidHandle"), "keyHandle");
}
SafeNCryptKeyHandle handle = keyHandle.Duplicate();
SafeNCryptProviderHandle kspHandle = new SafeNCryptProviderHandle();
RuntimeHelpers.PrepareConstrainedRegions();
try
{
}
finally
{
IntPtr newHandleValue = NCryptNative.GetPropertyAsIntPtr(keyHandle, "Provider Handle", CngPropertyOptions.None);
kspHandle.SetHandleValue(newHandleValue);
}
CngKey key = null;
bool flag = false;
try
{
key = new CngKey(kspHandle, handle);
bool flag2 = (keyHandleOpenOptions & CngKeyHandleOpenOptions.EphemeralKey) == CngKeyHandleOpenOptions.EphemeralKey;
if (!key.IsEphemeral && flag2)
{
key.IsEphemeral = true;
}
else if (key.IsEphemeral && !flag2)
{
throw new ArgumentException(System.SR.GetString("Cryptography_OpenEphemeralKeyHandleWithoutEphemeralFlag"), "keyHandleOpenOptions");
}
flag = true;
}
finally
{
if (!flag && (key != null))
{
key.Dispose();
}
}
return(key);
}
public override bool VerifyHash(byte[] hash, byte[] signature)
{
if (hash == null)
{
throw new ArgumentNullException("hash");
}
if (signature == null)
{
throw new ArgumentNullException("signature");
}
new SecurityPermission(SecurityPermissionFlag.UnmanagedCode).Assert();
SafeNCryptKeyHandle key = this.Key.Handle;
CodeAccessPermission.RevertAssert();
return(NCryptNative.VerifySignature(key, hash, signature));
}
public override bool VerifySignature(byte[] rgbHash, byte[] rgbSignature)
{
if (rgbHash == null)
{
throw new ArgumentNullException("rgbHash");
}
if (rgbSignature == null)
{
throw new ArgumentNullException("rgbSignature");
}
rgbHash = AdjustHashSizeIfNecessary(rgbHash);
return(NCryptNative.VerifySignature(KeyHandle, rgbHash, rgbSignature));
}
public SafeNCryptSecretHandle DeriveSecretAgreementHandle(CngKey otherPartyPublicKey)
{
if (otherPartyPublicKey == null)
{
throw new ArgumentNullException("otherPartyPublicKey");
}
if (otherPartyPublicKey.AlgorithmGroup != CngAlgorithmGroup.ECDiffieHellman)
{
throw new ArgumentException(System.SR.GetString("Cryptography_ArgECDHRequiresECDHKey"), "otherPartyPublicKey");
}
if (otherPartyPublicKey.KeySize != this.KeySize)
{
throw new ArgumentException(System.SR.GetString("Cryptography_ArgECDHKeySizeMismatch"), "otherPartyPublicKey");
}
return(NCryptNative.DeriveSecretAgreement(this.Key.Handle, otherPartyPublicKey.Handle));
}
public static bool Exists(string keyName, CngProvider provider, CngKeyOpenOptions options)
{
if (keyName == null)
{
throw new ArgumentNullException("keyName");
}
if (provider == null)
{
throw new ArgumentNullException("provider");
}
// Make sure that NCrypt is supported on this platform
if (!NCryptNative.NCryptSupported)
{
throw new PlatformNotSupportedException(SR.GetString(SR.Cryptography_PlatformNotSupported));
}
using (SafeNCryptProviderHandle kspHandle = NCryptNative.OpenStorageProvider(provider.Provider)) {
SafeNCryptKeyHandle keyHandle = null;
try {
NCryptNative.ErrorCode error = NCryptNative.UnsafeNativeMethods.NCryptOpenKey(kspHandle,
out keyHandle,
keyName,
0,
options);
// CNG will return either NTE_NOT_FOUND or NTE_BAD_KEYSET for the case where the key does
// not exist, so we need to check for both return codes.
bool keyNotFound = error == NCryptNative.ErrorCode.KeyDoesNotExist ||
error == NCryptNative.ErrorCode.NotFound;
if (error != NCryptNative.ErrorCode.Success && !keyNotFound)
{
throw new CryptographicException((int)error);
}
return(error == NCryptNative.ErrorCode.Success);
}
finally {
if (keyHandle != null)
{
keyHandle.Dispose();
}
}
}
}
private static void WritePublicKeyValue(XmlWriter writer, CngKey key)
{
BigInteger integer;
BigInteger integer2;
writer.WriteStartElement("PublicKey");
NCryptNative.UnpackEccPublicBlob(key.Export(CngKeyBlobFormat.EccPublicBlob), out integer, out integer2);
writer.WriteStartElement("X");
writer.WriteAttributeString("Value", integer.ToString("R", CultureInfo.InvariantCulture));
writer.WriteAttributeString("xsi", "type", "http://www.w3.org/2001/XMLSchema-instance", "PrimeFieldElemType");
writer.WriteEndElement();
writer.WriteStartElement("Y");
writer.WriteAttributeString("Value", integer2.ToString("R", CultureInfo.InvariantCulture));
writer.WriteAttributeString("xsi", "type", "http://www.w3.org/2001/XMLSchema-instance", "PrimeFieldElemType");
writer.WriteEndElement();
writer.WriteEndElement();
}