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//-----------------------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------------------------
namespace System.ServiceModel.Channels
{
using System.ComponentModel;
using System.Runtime;
using System.Runtime.InteropServices;
using System.Security.Cryptography.X509Certificates;
using System.ServiceModel.Diagnostics;
sealed partial class SelfSignedCertificate : IDisposable
{
CertificateHandle cert;
KeyContainerHandle keyContainer;
KeyHandle key;
string keyContainerName;
string password;
byte[] exportedBytes;
X509Certificate2 x509Cert;
const int CERT_STORE_PROV_MEMORY = 2;
const int DefaultLifeSpanInYears = 2;
public static SelfSignedCertificate Create(string name, string password)
{
return Create(name,
password,
DateTime.UtcNow,
DateTime.UtcNow.AddYears(DefaultLifeSpanInYears),
Guid.NewGuid().ToString());
}
public static SelfSignedCertificate Create(
string name,
string password,
DateTime start,
DateTime expire,
string containerName)
{
SelfSignedCertificate cert = new SelfSignedCertificate(password, containerName);
cert.GenerateKeys();
cert.CreateCertContext(name, start, expire);
cert.GetX509Certificate();
Fx.Assert(cert.cert != null, "CertContext could not be created");
return cert;
}
void CreateCertContext(string name, DateTime start, DateTime expire)
{
CriticalAllocHandle provInfo;
CriticalAllocHandle algorithmId;
provInfo = GetProviderInfo();
algorithmId = GetSha1AlgorithmId();
// convert the times to SystemTime structures
SystemTime beginTime = new SystemTime(start);
SystemTime expireTime = new SystemTime(expire);
// convert the name into a X500 name
CertificateName certName = new CertificateName(name);
using (CryptoApiBlob nameBlob = certName.GetCryptoApiBlob())
{
using (provInfo)
{
using (algorithmId)
{
cert = CertCreateSelfSignCertificate(keyContainer,
nameBlob.GetMemoryForPinning(),
SelfSignFlags.None,
provInfo,
algorithmId,
ref beginTime,
ref expireTime,
IntPtr.Zero);
if (cert.IsInvalid)
PeerExceptionHelper.ThrowInvalidOperation_PeerCertGenFailure(PeerExceptionHelper.GetLastException());
// if (!CertSetCertificateContextProperty(cert, CERT_KEY_PROV_INFO_PROP_ID, 0, provInfo))
// PeerExceptionHelper.ThrowInvalidOperation_PeerCertGenFailure(PeerExceptionHelper.GetLastException());
if (!CertSetCertificateContextProperty(cert, CERT_KEY_SPEC_PROP_ID, 0, key))
PeerExceptionHelper.ThrowInvalidOperation_PeerCertGenFailure(PeerExceptionHelper.GetLastException());
}
}
}
}
public X509Certificate2 GetX509Certificate()
{
if (this.x509Cert == null)
{
Export();
this.x509Cert = new X509Certificate2(exportedBytes, password);
}
return this.x509Cert;
}
void Export()
{
Fx.Assert(this.exportedBytes == null, "calling Export twice!!");
// create a temporary store to export
using (CertificateStoreHandle store = CertOpenStore(new IntPtr(CERT_STORE_PROV_MEMORY),
0,
IntPtr.Zero,
0,
IntPtr.Zero))
{
// add the certificate to the store
StoreCertificateHandle addedCert;
if (!CertAddCertificateContextToStore(store,
cert,
AddDisposition.ReplaceExisting,
out addedCert))
{
int error = Marshal.GetLastWin32Error();
Utility.CloseInvalidOutSafeHandle(addedCert);
PeerExceptionHelper.ThrowInvalidOperation_PeerCertGenFailure(new Win32Exception(error));
}
using (addedCert)
{
// Translate to a PFX
CryptoApiBlob pfxBlob = new CryptoApiBlob();
CryptoApiBlob.InteropHelper blob = pfxBlob.GetMemoryForPinning();
GCHandle pfxHandle = GCHandle.Alloc(blob, GCHandleType.Pinned);
try
{
// first figure out the storage space necessary
bool result = PFXExportCertStoreEx(store,
pfxHandle.AddrOfPinnedObject(),
password,
IntPtr.Zero,
PfxExportFlags.ExportPrivateKeys |
PfxExportFlags.ReportNoPrivateKey |
PfxExportFlags.ReportNotAbleToExportPrivateKey);
if (!result)
PeerExceptionHelper.ThrowInvalidOperation_PeerCertGenFailure(PeerExceptionHelper.GetLastException());
int storageSize = blob.size;
pfxHandle.Free();
pfxBlob.AllocateBlob(storageSize);
blob = pfxBlob.GetMemoryForPinning();
pfxHandle = GCHandle.Alloc(blob, GCHandleType.Pinned);
// now do the translation
if (!PFXExportCertStoreEx(store,
pfxHandle.AddrOfPinnedObject(),
password,
IntPtr.Zero,
PfxExportFlags.ExportPrivateKeys |
PfxExportFlags.ReportNoPrivateKey |
PfxExportFlags.ReportNotAbleToExportPrivateKey))
PeerExceptionHelper.ThrowInvalidOperation_PeerCertGenFailure(PeerExceptionHelper.GetLastException());
exportedBytes = pfxBlob.GetBytes();
}
finally
{
if (pfxHandle != null)
pfxHandle.Free();
if (pfxBlob != null)
pfxBlob.Dispose();
}
}
}
}
void GenerateKeys()
{
// generate the key container to put the key in
if (!CryptAcquireContext(out keyContainer,
keyContainerName,
null,
ProviderType.RsaSecureChannel,
ContextFlags.NewKeySet | ContextFlags.Silent))
{
int error = Marshal.GetLastWin32Error();
Utility.CloseInvalidOutSafeHandle(keyContainer);
keyContainer = null;
PeerExceptionHelper.ThrowInvalidOperation_PeerCertGenFailure(new Win32Exception(error));
}
// generate the key
if (!CryptGenKey(keyContainer,
AlgorithmType.KeyExchange,
KeyFlags.Exportable2k,
out key))
{
int error = Marshal.GetLastWin32Error();
Utility.CloseInvalidOutSafeHandle(key);
key = null;
PeerExceptionHelper.ThrowInvalidOperation_PeerCertGenFailure(new Win32Exception(error));
}
}
void Dispose(bool disposing)
{
if (disposing)
{
if (cert != null)
cert.Dispose();
if (key != null)
key.Dispose();
if (keyContainer != null)
keyContainer.Dispose();
if (keyContainerName != null)
{
CryptAcquireContext(out keyContainer,
keyContainerName,
null,
ProviderType.RsaSecureChannel,
ContextFlags.DeleteKeySet);
Utility.CloseInvalidOutSafeHandle(keyContainer);
}
GC.SuppressFinalize(this);
}
}
public void Dispose()
{
Dispose(true);
}
SelfSignedCertificate(string password, string containerName)
{
this.password = password;
this.keyContainerName = containerName;
}
}
}
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