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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CRYPTO_SCOPED_CAPI_TYPES_H_
#define CRYPTO_SCOPED_CAPI_TYPES_H_
#include <windows.h>
#include <memory>
#include "base/check.h"
#include "base/scoped_generic.h"
#include "base/win/wincrypt_shim.h"
namespace crypto {
// Simple traits for the Free family of CryptoAPI functions, such as
// CryptDestroyHash, which take only a single argument to release.
template <typename CAPIHandle, BOOL(WINAPI* Destroyer)(CAPIHandle)>
struct CAPITraits {
static CAPIHandle InvalidValue() { return 0; }
static void Free(CAPIHandle handle) {
BOOL ok = Destroyer(handle);
DCHECK(ok);
}
};
// Traits for the Close/Release family of CryptoAPI functions, which take
// a second DWORD parameter indicating flags to use when closing or releasing.
// This includes functions like CertCloseStore or CryptReleaseContext.
template <typename CAPIHandle,
BOOL(WINAPI* Destroyer)(CAPIHandle, DWORD),
DWORD flags>
struct CAPITraitsWithFlags {
static CAPIHandle InvalidValue() { return 0; }
static void Free(CAPIHandle handle) {
BOOL ok = Destroyer(handle, flags);
DCHECK(ok);
}
};
using ScopedHCERTSTORE =
base::ScopedGeneric<HCERTSTORE,
CAPITraitsWithFlags<HCERTSTORE, CertCloseStore, 0>>;
using ScopedHCRYPTPROV = base::ScopedGeneric<
HCRYPTPROV,
CAPITraitsWithFlags<HCRYPTPROV, CryptReleaseContext, 0>>;
using ScopedHCRYPTKEY =
base::ScopedGeneric<HCRYPTKEY, CAPITraits<HCRYPTKEY, CryptDestroyKey>>;
using ScopedHCRYPTHASH =
base::ScopedGeneric<HCRYPTHASH, CAPITraits<HCRYPTHASH, CryptDestroyHash>>;
using ScopedHCRYPTMSG =
base::ScopedGeneric<HCRYPTMSG, CAPITraits<HCRYPTMSG, CryptMsgClose>>;
struct ChainEngineTraits {
static HCERTCHAINENGINE InvalidValue() { return nullptr; }
static void Free(HCERTCHAINENGINE engine) {
CertFreeCertificateChainEngine(engine);
}
};
using ScopedHCERTCHAINENGINE =
base::ScopedGeneric<HCERTCHAINENGINE, ChainEngineTraits>;
struct FreeCertContextFunctor {
void operator()(PCCERT_CONTEXT context) const {
if (context)
CertFreeCertificateContext(context);
}
};
using ScopedPCCERT_CONTEXT =
std::unique_ptr<const CERT_CONTEXT, FreeCertContextFunctor>;
struct FreeCertChainContextFunctor {
void operator()(PCCERT_CHAIN_CONTEXT chain_context) const {
if (chain_context)
CertFreeCertificateChain(chain_context);
}
};
using ScopedPCCERT_CHAIN_CONTEXT =
std::unique_ptr<const CERT_CHAIN_CONTEXT, FreeCertChainContextFunctor>;
struct FreeCtlContextFunctor {
void operator()(PCCTL_CONTEXT ctl_context) const {
if (ctl_context)
CertFreeCTLContext(ctl_context);
}
};
using ScopedPCCTL_CONTEXT =
std::unique_ptr<const CTL_CONTEXT, FreeCtlContextFunctor>;
} // namespace crypto
#endif // CRYPTO_SCOPED_CAPI_TYPES_H_
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