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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "crypto/openssl_util.h"
#include <openssl/err.h>
#include <openssl/cpu.h>
#include <openssl/crypto.h>
#include <stddef.h>
#include <stdint.h>
#include "base/logging.h"
#include "base/macros.h"
#include "base/memory/singleton.h"
#include "base/strings/string_piece.h"
#include "build/build_config.h"
#if defined(OS_ANDROID) && defined(ARCH_CPU_ARMEL)
#include <cpu-features.h>
#include "base/cpu.h"
#endif
namespace crypto {
namespace {
// Singleton for initializing and cleaning up the OpenSSL library.
class OpenSSLInitSingleton {
public:
static OpenSSLInitSingleton* GetInstance() {
// We allow the SSL environment to leak for multiple reasons:
// - it is used from a non-joinable worker thread that is not stopped on
// shutdown, hence may still be using OpenSSL library after the AtExit
// runner has completed.
// - There are other OpenSSL related singletons (e.g. the client socket
// context) who's cleanup depends on the global environment here, but
// we can't control the order the AtExit handlers will run in so
// allowing the global environment to leak at least ensures it is
// available for those other singletons to reliably cleanup.
return base::Singleton<
OpenSSLInitSingleton,
base::LeakySingletonTraits<OpenSSLInitSingleton>>::get();
}
private:
friend struct base::DefaultSingletonTraits<OpenSSLInitSingleton>;
OpenSSLInitSingleton() {
#if defined(OS_ANDROID) && defined(ARCH_CPU_ARMEL)
const bool has_neon =
(android_getCpuFeatures() & ANDROID_CPU_ARM_FEATURE_NEON) != 0;
base::CPU cpu;
// CRYPTO_set_NEON_capable is called before |CRYPTO_library_init| because
// this stops BoringSSL from probing for NEON support via SIGILL in the case
// that getauxval isn't present. Also workaround a CPU with broken NEON
// support. See https://code.google.com/p/chromium/issues/detail?id=341598
CRYPTO_set_NEON_capable(has_neon && !cpu.has_broken_neon());
#endif
CRYPTO_library_init();
}
~OpenSSLInitSingleton() {}
DISALLOW_COPY_AND_ASSIGN(OpenSSLInitSingleton);
};
// Callback routine for OpenSSL to print error messages. |str| is a
// NULL-terminated string of length |len| containing diagnostic information
// such as the library, function and reason for the error, the file and line
// where the error originated, plus potentially any context-specific
// information about the error. |context| contains a pointer to user-supplied
// data, which is currently unused.
// If this callback returns a value <= 0, OpenSSL will stop processing the
// error queue and return, otherwise it will continue calling this function
// until all errors have been removed from the queue.
int OpenSSLErrorCallback(const char* str, size_t len, void* context) {
DVLOG(1) << "\t" << base::StringPiece(str, len);
return 1;
}
} // namespace
void EnsureOpenSSLInit() {
(void)OpenSSLInitSingleton::GetInstance();
}
void ClearOpenSSLERRStack(const tracked_objects::Location& location) {
if (logging::DEBUG_MODE && VLOG_IS_ON(1)) {
uint32_t error_num = ERR_peek_error();
if (error_num == 0)
return;
std::string message;
location.Write(true, true, &message);
DVLOG(1) << "OpenSSL ERR_get_error stack from " << message;
ERR_print_errors_cb(&OpenSSLErrorCallback, NULL);
} else {
ERR_clear_error();
}
}
} // namespace crypto
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