Diff
Modified: trunk/Source/WebCore/ChangeLog (239691 => 239692)
--- trunk/Source/WebCore/ChangeLog 2019-01-07 20:20:42 UTC (rev 239691)
+++ trunk/Source/WebCore/ChangeLog 2019-01-07 20:30:10 UTC (rev 239692)
@@ -1,3 +1,50 @@
+2019-01-07 David Kilzer <[email protected]>
+
+ PlatformECKey should use a std::unique_ptr
+ <https://webkit.org/b/193170>
+
+ Reviewed by Brent Fulgham.
+
+ Broadly:
+ - Switch from using raw pointers to using std::unique_ptr<> to
+ hold PlatformECKey.
+ - Introduce PlatformECKeyContainer type to handle different
+ std::unique_ptr<> types on each platform.
+ - Get rid of custom CryptoKeyEC destructors since the
+ std::unique_ptr<> handles that with a Deleter.
+ - Initialize stack variables to nullptr.
+
+ * crypto/gcrypt/CryptoKeyECGCrypt.cpp:
+ (WebCore::CryptoKeyEC::keySizeInBits const):
+ (WebCore::CryptoKeyEC::platformGeneratePair):
+ (WebCore::CryptoKeyEC::platformImportRaw):
+ (WebCore::CryptoKeyEC::platformImportJWKPublic):
+ (WebCore::CryptoKeyEC::platformImportJWKPrivate):
+ (WebCore::CryptoKeyEC::platformImportSpki):
+ (WebCore::CryptoKeyEC::platformImportPkcs8):
+ (WebCore::CryptoKeyEC::platformExportRaw const):
+ (WebCore::CryptoKeyEC::platformAddFieldElements const):
+ (WebCore::CryptoKeyEC::platformExportSpki const):
+ (WebCore::CryptoKeyEC::platformExportPkcs8 const):
+ (WebCore::CryptoKeyEC::~CryptoKeyEC): Deleted.
+ * crypto/keys/CryptoKeyEC.cpp:
+ (WebCore::CryptoKeyEC::CryptoKeyEC):
+ * crypto/keys/CryptoKeyEC.h:
+ (WebCore::CCECCryptorRefDeleter::operator() const):
+ * crypto/mac/CryptoKeyECMac.cpp:
+ (WebCore::CryptoKeyEC::keySizeInBits const):
+ (WebCore::CryptoKeyEC::platformGeneratePair):
+ (WebCore::CryptoKeyEC::platformImportRaw):
+ (WebCore::CryptoKeyEC::platformExportRaw const):
+ (WebCore::CryptoKeyEC::platformImportJWKPublic):
+ (WebCore::CryptoKeyEC::platformImportJWKPrivate):
+ (WebCore::CryptoKeyEC::platformAddFieldElements const):
+ (WebCore::CryptoKeyEC::platformImportSpki):
+ (WebCore::CryptoKeyEC::platformExportSpki const):
+ (WebCore::CryptoKeyEC::platformImportPkcs8):
+ (WebCore::CryptoKeyEC::platformExportPkcs8 const):
+ (WebCore::CryptoKeyEC::~CryptoKeyEC): Deleted.
+
2019-01-07 Antti Koivisto <[email protected]>
UI process side scrollbars for UI side compositing on Mac
Modified: trunk/Source/WebCore/crypto/gcrypt/CryptoKeyECGCrypt.cpp (239691 => 239692)
--- trunk/Source/WebCore/crypto/gcrypt/CryptoKeyECGCrypt.cpp 2019-01-07 20:20:42 UTC (rev 239691)
+++ trunk/Source/WebCore/crypto/gcrypt/CryptoKeyECGCrypt.cpp 2019-01-07 20:30:10 UTC (rev 239692)
@@ -1,5 +1,5 @@
/*
- * Copyright (C) 2017 Apple Inc. All rights reserved.
+ * Copyright (C) 2017-2019 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@@ -31,7 +31,6 @@
#include "CryptoKeyPair.h"
#include "GCryptUtilities.h"
#include "JsonWebKey.h"
-#include <pal/crypto/gcrypt/Handle.h>
#include <pal/crypto/gcrypt/Utilities.h>
#include <pal/crypto/tasn1/Utilities.h>
#include <wtf/text/Base64.h>
@@ -103,16 +102,10 @@
return 2 * curveUncompressedFieldElementSize(curve) + 1;
}
-CryptoKeyEC::~CryptoKeyEC()
-{
- if (m_platformKey)
- PAL::GCrypt::HandleDeleter<gcry_sexp_t>()(m_platformKey);
-}
-
size_t CryptoKeyEC::keySizeInBits() const
{
size_t size = curveSize(m_curve);
- ASSERT(size == gcry_pk_get_nbits(m_platformKey));
+ ASSERT(size == gcry_pk_get_nbits(m_platformKey.get()));
return size;
}
@@ -142,8 +135,8 @@
if (!publicKeySexp || !privateKeySexp)
return WTF::nullopt;
- auto publicKey = CryptoKeyEC::create(identifier, curve, CryptoKeyType::Public, publicKeySexp.release(), true, usages);
- auto privateKey = CryptoKeyEC::create(identifier, curve, CryptoKeyType::Private, privateKeySexp.release(), extractable, usages);
+ auto publicKey = CryptoKeyEC::create(identifier, curve, CryptoKeyType::Public, PlatformECKeyContainer(publicKeySexp.release()), true, usages);
+ auto privateKey = CryptoKeyEC::create(identifier, curve, CryptoKeyType::Private, PlatformECKeyContainer(privateKeySexp.release()), extractable, usages);
return CryptoKeyPair { WTFMove(publicKey), WTFMove(privateKey) };
}
@@ -160,7 +153,7 @@
return nullptr;
}
- return create(identifier, curve, CryptoKeyType::Public, platformKey.release(), extractable, usages);
+ return create(identifier, curve, CryptoKeyType::Public, PlatformECKeyContainer(platformKey.release()), extractable, usages);
}
RefPtr<CryptoKeyEC> CryptoKeyEC::platformImportJWKPublic(CryptoAlgorithmIdentifier identifier, NamedCurve curve, Vector<uint8_t>&& x, Vector<uint8_t>&& y, bool extractable, CryptoKeyUsageBitmap usages)
@@ -184,7 +177,7 @@
return nullptr;
}
- return create(identifier, curve, CryptoKeyType::Public, platformKey.release(), extractable, usages);
+ return create(identifier, curve, CryptoKeyType::Public, PlatformECKeyContainer(platformKey.release()), extractable, usages);
}
RefPtr<CryptoKeyEC> CryptoKeyEC::platformImportJWKPrivate(CryptoAlgorithmIdentifier identifier, NamedCurve curve, Vector<uint8_t>&& x, Vector<uint8_t>&& y, Vector<uint8_t>&& d, bool extractable, CryptoKeyUsageBitmap usages)
@@ -208,7 +201,7 @@
return nullptr;
}
- return create(identifier, curve, CryptoKeyType::Private, platformKey.release(), extractable, usages);
+ return create(identifier, curve, CryptoKeyType::Private, PlatformECKeyContainer(platformKey.release()), extractable, usages);
}
static bool supportedAlgorithmIdentifier(CryptoAlgorithmIdentifier keyIdentifier, const Vector<uint8_t>& identifier)
@@ -345,7 +338,7 @@
}
// Finally create a new CryptoKeyEC object, transferring to it ownership of the `public-key` s-_expression_.
- return create(identifier, curve, CryptoKeyType::Public, platformKey.release(), extractable, usages);
+ return create(identifier, curve, CryptoKeyType::Public, PlatformECKeyContainer(platformKey.release()), extractable, usages);
}
RefPtr<CryptoKeyEC> CryptoKeyEC::platformImportPkcs8(CryptoAlgorithmIdentifier identifier, NamedCurve curve, Vector<uint8_t>&& keyData, bool extractable, CryptoKeyUsageBitmap usages)
@@ -490,13 +483,13 @@
return nullptr;
}
- return create(identifier, curve, CryptoKeyType::Private, platformKey.release(), extractable, usages);
+ return create(identifier, curve, CryptoKeyType::Private, PlatformECKeyContainer(platformKey.release()), extractable, usages);
}
Vector<uint8_t> CryptoKeyEC::platformExportRaw() const
{
PAL::GCrypt::Handle<gcry_ctx_t> context;
- gcry_error_t error = gcry_mpi_ec_new(&context, m_platformKey, nullptr);
+ gcry_error_t error = gcry_mpi_ec_new(&context, m_platformKey.get(), nullptr);
if (error != GPG_ERR_NO_ERROR) {
PAL::GCrypt::logError(error);
return { };
@@ -516,7 +509,7 @@
bool CryptoKeyEC::platformAddFieldElements(JsonWebKey& jwk) const
{
PAL::GCrypt::Handle<gcry_ctx_t> context;
- gcry_error_t error = gcry_mpi_ec_new(&context, m_platformKey, nullptr);
+ gcry_error_t error = gcry_mpi_ec_new(&context, m_platformKey.get(), nullptr);
if (error != GPG_ERR_NO_ERROR) {
PAL::GCrypt::logError(error);
return false;
@@ -595,7 +588,7 @@
}
// Retrieve the `q` s-_expression_, which should contain the public key data.
- PAL::GCrypt::Handle<gcry_sexp_t> qSexp(gcry_sexp_find_token(m_platformKey, "q", 0));
+ PAL::GCrypt::Handle<gcry_sexp_t> qSexp(gcry_sexp_find_token(m_platformKey.get(), "q", 0));
if (!qSexp)
return { };
@@ -649,7 +642,7 @@
// Construct the EC context that we'll use to retrieve private and public key data.
PAL::GCrypt::Handle<gcry_ctx_t> context;
- gcry_error_t error = gcry_mpi_ec_new(&context, m_platformKey, nullptr);
+ gcry_error_t error = gcry_mpi_ec_new(&context, m_platformKey.get(), nullptr);
if (error != GPG_ERR_NO_ERROR)
return { };
Modified: trunk/Source/WebCore/crypto/keys/CryptoKeyEC.cpp (239691 => 239692)
--- trunk/Source/WebCore/crypto/keys/CryptoKeyEC.cpp 2019-01-07 20:20:42 UTC (rev 239691)
+++ trunk/Source/WebCore/crypto/keys/CryptoKeyEC.cpp 2019-01-07 20:30:10 UTC (rev 239692)
@@ -1,5 +1,5 @@
/*
- * Copyright (C) 2017 Apple Inc. All rights reserved.
+ * Copyright (C) 2017-2019 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@@ -50,9 +50,9 @@
return WTF::nullopt;
}
-CryptoKeyEC::CryptoKeyEC(CryptoAlgorithmIdentifier identifier, NamedCurve curve, CryptoKeyType type, PlatformECKey platformKey, bool extractable, CryptoKeyUsageBitmap usages)
+CryptoKeyEC::CryptoKeyEC(CryptoAlgorithmIdentifier identifier, NamedCurve curve, CryptoKeyType type, PlatformECKeyContainer&& platformKey, bool extractable, CryptoKeyUsageBitmap usages)
: CryptoKey(identifier, type, extractable, usages)
- , m_platformKey(platformKey)
+ , m_platformKey(WTFMove(platformKey))
, m_curve(curve)
{
// Only CryptoKeyEC objects for supported curves should be created.
Modified: trunk/Source/WebCore/crypto/keys/CryptoKeyEC.h (239691 => 239692)
--- trunk/Source/WebCore/crypto/keys/CryptoKeyEC.h 2019-01-07 20:20:42 UTC (rev 239691)
+++ trunk/Source/WebCore/crypto/keys/CryptoKeyEC.h 2019-01-07 20:30:10 UTC (rev 239692)
@@ -1,5 +1,5 @@
/*
- * Copyright (C) 2017 Apple Inc. All rights reserved.
+ * Copyright (C) 2017-2019 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@@ -32,14 +32,22 @@
#if ENABLE(WEB_CRYPTO)
#if OS(DARWIN) && !PLATFORM(GTK)
-typedef struct _CCECCryptor *CCECCryptorRef;
+#include "CommonCryptoUtilities.h"
+
typedef CCECCryptorRef PlatformECKey;
+namespace WebCore {
+struct CCECCryptorRefDeleter {
+ void operator()(CCECCryptorRef key) const { CCECCryptorRelease(key); }
+};
+}
+typedef std::unique_ptr<typename std::remove_pointer<CCECCryptorRef>::type, WebCore::CCECCryptorRefDeleter> PlatformECKeyContainer;
#endif
#if PLATFORM(GTK) || PLATFORM(WPE)
-// gcry_sexp* equates gcry_sexp_t.
-struct gcry_sexp;
-typedef gcry_sexp* PlatformECKey;
+#include <pal/crypto/gcrypt/Handle.h>
+
+typedef gcry_sexp_t PlatformECKey;
+typedef std::unique_ptr<typename std::remove_pointer<gcry_sexp_t>::type, PAL::GCrypt::HandleDeleter<gcry_sexp_t>> PlatformECKeyContainer;
#endif
@@ -55,11 +63,11 @@
P521,
};
- static Ref<CryptoKeyEC> create(CryptoAlgorithmIdentifier identifier, NamedCurve curve, CryptoKeyType type, PlatformECKey platformKey, bool extractable, CryptoKeyUsageBitmap usages)
+ static Ref<CryptoKeyEC> create(CryptoAlgorithmIdentifier identifier, NamedCurve curve, CryptoKeyType type, PlatformECKeyContainer&& platformKey, bool extractable, CryptoKeyUsageBitmap usages)
{
- return adoptRef(*new CryptoKeyEC(identifier, curve, type, platformKey, extractable, usages));
+ return adoptRef(*new CryptoKeyEC(identifier, curve, type, WTFMove(platformKey), extractable, usages));
}
- virtual ~CryptoKeyEC();
+ virtual ~CryptoKeyEC() = default;
static ExceptionOr<CryptoKeyPair> generatePair(CryptoAlgorithmIdentifier, const String& curve, bool extractable, CryptoKeyUsageBitmap);
static RefPtr<CryptoKeyEC> importRaw(CryptoAlgorithmIdentifier, const String& curve, Vector<uint8_t>&& keyData, bool extractable, CryptoKeyUsageBitmap);
@@ -75,11 +83,11 @@
size_t keySizeInBits() const;
NamedCurve namedCurve() const { return m_curve; }
String namedCurveString() const;
- PlatformECKey platformKey() const { return m_platformKey; }
+ PlatformECKey platformKey() const { return m_platformKey.get(); }
static bool isValidECAlgorithm(CryptoAlgorithmIdentifier);
private:
- CryptoKeyEC(CryptoAlgorithmIdentifier, NamedCurve, CryptoKeyType, PlatformECKey, bool extractable, CryptoKeyUsageBitmap);
+ CryptoKeyEC(CryptoAlgorithmIdentifier, NamedCurve, CryptoKeyType, PlatformECKeyContainer&&, bool extractable, CryptoKeyUsageBitmap);
CryptoKeyClass keyClass() const final { return CryptoKeyClass::EC; }
@@ -97,7 +105,7 @@
Vector<uint8_t> platformExportSpki() const;
Vector<uint8_t> platformExportPkcs8() const;
- PlatformECKey m_platformKey;
+ PlatformECKeyContainer m_platformKey;
NamedCurve m_curve;
};
Modified: trunk/Source/WebCore/crypto/mac/CryptoKeyECMac.cpp (239691 => 239692)
--- trunk/Source/WebCore/crypto/mac/CryptoKeyECMac.cpp 2019-01-07 20:20:42 UTC (rev 239691)
+++ trunk/Source/WebCore/crypto/mac/CryptoKeyECMac.cpp 2019-01-07 20:30:10 UTC (rev 239692)
@@ -1,5 +1,5 @@
/*
- * Copyright (C) 2017 Apple Inc. All rights reserved.
+ * Copyright (C) 2017-2019 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@@ -29,7 +29,6 @@
#if ENABLE(WEB_CRYPTO)
#include "CommonCryptoDERUtilities.h"
-#include "CommonCryptoUtilities.h"
#include "JsonWebKey.h"
#include <wtf/text/Base64.h>
@@ -95,14 +94,9 @@
return 0;
}
-CryptoKeyEC::~CryptoKeyEC()
-{
- CCECCryptorRelease(m_platformKey);
-}
-
size_t CryptoKeyEC::keySizeInBits() const
{
- int result = CCECGetKeySize(m_platformKey);
+ int result = CCECGetKeySize(m_platformKey.get());
return result ? result : 0;
}
@@ -114,13 +108,13 @@
Optional<CryptoKeyPair> CryptoKeyEC::platformGeneratePair(CryptoAlgorithmIdentifier identifier, NamedCurve curve, bool extractable, CryptoKeyUsageBitmap usages)
{
size_t size = getKeySizeFromNamedCurve(curve);
- CCECCryptorRef ccPublicKey;
- CCECCryptorRef ccPrivateKey;
+ CCECCryptorRef ccPublicKey = nullptr;
+ CCECCryptorRef ccPrivateKey = nullptr;
if (CCECCryptorGeneratePair(size, &ccPublicKey, &ccPrivateKey))
return WTF::nullopt;
- auto publicKey = CryptoKeyEC::create(identifier, curve, CryptoKeyType::Public, ccPublicKey, true, usages);
- auto privateKey = CryptoKeyEC::create(identifier, curve, CryptoKeyType::Private, ccPrivateKey, extractable, usages);
+ auto publicKey = CryptoKeyEC::create(identifier, curve, CryptoKeyType::Public, PlatformECKeyContainer(ccPublicKey), true, usages);
+ auto privateKey = CryptoKeyEC::create(identifier, curve, CryptoKeyType::Private, PlatformECKeyContainer(ccPrivateKey), extractable, usages);
return CryptoKeyPair { WTFMove(publicKey), WTFMove(privateKey) };
}
@@ -129,11 +123,11 @@
if (!doesUncompressedPointMatchNamedCurve(curve, keyData.size()))
return nullptr;
- CCECCryptorRef ccPublicKey;
+ CCECCryptorRef ccPublicKey = nullptr;
if (CCECCryptorImportKey(kCCImportKeyBinary, keyData.data(), keyData.size(), ccECKeyPublic, &ccPublicKey))
return nullptr;
- return create(identifier, curve, CryptoKeyType::Public, ccPublicKey, extractable, usages);
+ return create(identifier, curve, CryptoKeyType::Public, PlatformECKeyContainer(ccPublicKey), extractable, usages);
}
Vector<uint8_t> CryptoKeyEC::platformExportRaw() const
@@ -141,7 +135,7 @@
size_t expectedSize = keySizeInBits() / 4 + 1; // Per Section 2.3.4 of http://www.secg.org/sec1-v2.pdf
Vector<uint8_t> result(expectedSize);
size_t size = result.size();
- if (UNLIKELY(CCECCryptorExportKey(kCCImportKeyBinary, result.data(), &size, ccECKeyPublic, m_platformKey) || size != expectedSize))
+ if (UNLIKELY(CCECCryptorExportKey(kCCImportKeyBinary, result.data(), &size, ccECKeyPublic, m_platformKey.get()) || size != expectedSize))
return { };
return result;
}
@@ -152,11 +146,11 @@
return nullptr;
size_t size = getKeySizeFromNamedCurve(curve);
- CCECCryptorRef ccPublicKey;
+ CCECCryptorRef ccPublicKey = nullptr;
if (CCECCryptorCreateFromData(size, x.data(), x.size(), y.data(), y.size(), &ccPublicKey))
return nullptr;
- return create(identifier, curve, CryptoKeyType::Public, ccPublicKey, extractable, usages);
+ return create(identifier, curve, CryptoKeyType::Public, PlatformECKeyContainer(ccPublicKey), extractable, usages);
}
RefPtr<CryptoKeyEC> CryptoKeyEC::platformImportJWKPrivate(CryptoAlgorithmIdentifier identifier, NamedCurve curve, Vector<uint8_t>&& x, Vector<uint8_t>&& y, Vector<uint8_t>&& d, bool extractable, CryptoKeyUsageBitmap usages)
@@ -172,11 +166,11 @@
binaryInput.appendVector(y);
binaryInput.appendVector(d);
- CCECCryptorRef ccPrivateKey;
+ CCECCryptorRef ccPrivateKey = nullptr;
if (CCECCryptorImportKey(kCCImportKeyBinary, binaryInput.data(), binaryInput.size(), ccECKeyPrivate, &ccPrivateKey))
return nullptr;
- return create(identifier, curve, CryptoKeyType::Private, ccPrivateKey, extractable, usages);
+ return create(identifier, curve, CryptoKeyType::Private, PlatformECKeyContainer(ccPrivateKey), extractable, usages);
}
bool CryptoKeyEC::platformAddFieldElements(JsonWebKey& jwk) const
@@ -189,11 +183,11 @@
size_t size = result.size();
switch (type()) {
case CryptoKeyType::Public:
- if (UNLIKELY(CCECCryptorExportKey(kCCImportKeyBinary, result.data(), &size, ccECKeyPublic, m_platformKey)))
+ if (UNLIKELY(CCECCryptorExportKey(kCCImportKeyBinary, result.data(), &size, ccECKeyPublic, m_platformKey.get())))
return false;
break;
case CryptoKeyType::Private:
- if (UNLIKELY(CCECCryptorExportKey(kCCImportKeyBinary, result.data(), &size, ccECKeyPrivate, m_platformKey)))
+ if (UNLIKELY(CCECCryptorExportKey(kCCImportKeyBinary, result.data(), &size, ccECKeyPrivate, m_platformKey.get())))
return false;
break;
default:
@@ -269,11 +263,11 @@
if (!doesUncompressedPointMatchNamedCurve(curve, keyData.size() - index))
return nullptr;
- CCECCryptorRef ccPublicKey;
+ CCECCryptorRef ccPublicKey = nullptr;
if (CCECCryptorImportKey(kCCImportKeyBinary, keyData.data() + index, keyData.size() - index, ccECKeyPublic, &ccPublicKey))
return nullptr;
- return create(identifier, curve, CryptoKeyType::Public, ccPublicKey, extractable, usages);
+ return create(identifier, curve, CryptoKeyType::Public, PlatformECKeyContainer(ccPublicKey), extractable, usages);
}
Vector<uint8_t> CryptoKeyEC::platformExportSpki() const
@@ -281,7 +275,7 @@
size_t expectedKeySize = keySizeInBits() / 4 + 1; // Per Section 2.3.4 of http://www.secg.org/sec1-v2.pdf
Vector<uint8_t> keyBytes(expectedKeySize);
size_t keySize = keyBytes.size();
- if (UNLIKELY(CCECCryptorExportKey(kCCImportKeyBinary, keyBytes.data(), &keySize, ccECKeyPublic, m_platformKey) || keySize != expectedKeySize))
+ if (UNLIKELY(CCECCryptorExportKey(kCCImportKeyBinary, keyBytes.data(), &keySize, ccECKeyPublic, m_platformKey.get()) || keySize != expectedKeySize))
return { };
// The following addes SPKI header to a raw EC public key.
@@ -366,11 +360,11 @@
return nullptr;
keyBinary.append(keyData.data() + privateKeyPos, getKeySizeFromNamedCurve(curve) / 8);
- CCECCryptorRef ccPrivateKey;
+ CCECCryptorRef ccPrivateKey = nullptr;
if (CCECCryptorImportKey(kCCImportKeyBinary, keyBinary.data(), keyBinary.size(), ccECKeyPrivate, &ccPrivateKey))
return nullptr;
- return create(identifier, curve, CryptoKeyType::Private, ccPrivateKey, extractable, usages);
+ return create(identifier, curve, CryptoKeyType::Private, PlatformECKeyContainer(ccPrivateKey), extractable, usages);
}
Vector<uint8_t> CryptoKeyEC::platformExportPkcs8() const
@@ -379,7 +373,7 @@
size_t expectedKeySize = keySizeInBytes * 3 + 1; // 04 + X + Y + D
Vector<uint8_t> keyBytes(expectedKeySize);
size_t keySize = keyBytes.size();
- if (UNLIKELY(CCECCryptorExportKey(kCCImportKeyBinary, keyBytes.data(), &keySize, ccECKeyPrivate, m_platformKey) || keySize != expectedKeySize))
+ if (UNLIKELY(CCECCryptorExportKey(kCCImportKeyBinary, keyBytes.data(), &keySize, ccECKeyPrivate, m_platformKey.get()) || keySize != expectedKeySize))
return { };
// The following addes PKCS8 header to a raw EC private key.
