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retro-imager/src/acceleratedcryptographichash.h

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Use accelerated hashing for verification Modern CPUs have special instructions to accelerate computing SHA hashes. The Qt QCryptographicHash code is standard C, so not taking advantage of those though. Outsource the hashing to OpenSSL that does. Shaves off some seconds during verification stage.
2020-05-23 17:50:59 +02:00
#ifndef ACCELERATEDCRYPTOGRAPHICHASH_H
#define ACCELERATEDCRYPTOGRAPHICHASH_H
/*
* SPDX-License-Identifier: Apache-2.0
Raspberry Pi (Trading) Limited -> Raspberry Pi Ltd Same legal entity, just a company name change. https://find-and-update.company-information.service.gov.uk/company/08207441/filing-history
2022-02-03 11:48:21 +01:00
* Copyright (C) 2020 Raspberry Pi Ltd
Use accelerated hashing for verification Modern CPUs have special instructions to accelerate computing SHA hashes. The Qt QCryptographicHash code is standard C, so not taking advantage of those though. Outsource the hashing to OpenSSL that does. Shaves off some seconds during verification stage.
2020-05-23 17:50:59 +02:00
*/
#include <QCryptographicHash>
Build changes - Add support for embedded Linux without X, dbus, udisks, ntp, etc. - Misc minor changes
2020-05-25 00:36:16 +02:00
#ifdef Q_OS_DARWIN
Mac: use system hash functions May perform better under emulation
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#include <CommonCrypto/CommonDigest.h>
#define SHA256_CTX CC_SHA256_CTX
#define SHA256_DIGEST_LENGTH CC_SHA256_DIGEST_LENGTH
#define SHA256_Init CC_SHA256_Init
#define SHA256_Update CC_SHA256_Update
#define SHA256_Final CC_SHA256_Final
Build changes - Add support for embedded Linux without X, dbus, udisks, ntp, etc. - Misc minor changes
2020-05-25 00:36:16 +02:00
#else
Linux: allow using GnuTLS instead of OpenSSL for computing SHA256 hashes Prevents issues with often changing OpenSSL ABI. Ref #429
2022-06-14 16:13:55 +02:00
#ifdef HAVE_GNUTLS
#include "gnutls/crypto.h"
#else
Use accelerated hashing for verification Modern CPUs have special instructions to accelerate computing SHA hashes. The Qt QCryptographicHash code is standard C, so not taking advantage of those though. Outsource the hashing to OpenSSL that does. Shaves off some seconds during verification stage.
2020-05-23 17:50:59 +02:00
#include "openssl/sha.h"
Mac: use system hash functions May perform better under emulation
2020-09-29 19:56:12 +02:00
#endif
Linux: allow using GnuTLS instead of OpenSSL for computing SHA256 hashes Prevents issues with often changing OpenSSL ABI. Ref #429
2022-06-14 16:13:55 +02:00
#endif
Use accelerated hashing for verification Modern CPUs have special instructions to accelerate computing SHA hashes. The Qt QCryptographicHash code is standard C, so not taking advantage of those though. Outsource the hashing to OpenSSL that does. Shaves off some seconds during verification stage.
2020-05-23 17:50:59 +02:00
class AcceleratedCryptographicHash
{
public:
explicit AcceleratedCryptographicHash(QCryptographicHash::Algorithm method);
virtual ~AcceleratedCryptographicHash();
void addData(const char *data, int length);
void addData(const QByteArray &data);
QByteArray result();
protected:
Linux: allow using GnuTLS instead of OpenSSL for computing SHA256 hashes Prevents issues with often changing OpenSSL ABI. Ref #429
2022-06-14 16:13:55 +02:00
#ifdef HAVE_GNUTLS
gnutls_hash_hd_t _sha256;
#else
Use accelerated hashing for verification Modern CPUs have special instructions to accelerate computing SHA hashes. The Qt QCryptographicHash code is standard C, so not taking advantage of those though. Outsource the hashing to OpenSSL that does. Shaves off some seconds during verification stage.
2020-05-23 17:50:59 +02:00
SHA256_CTX _sha256;
Linux: allow using GnuTLS instead of OpenSSL for computing SHA256 hashes Prevents issues with often changing OpenSSL ABI. Ref #429
2022-06-14 16:13:55 +02:00
#endif
Use accelerated hashing for verification Modern CPUs have special instructions to accelerate computing SHA hashes. The Qt QCryptographicHash code is standard C, so not taking advantage of those though. Outsource the hashing to OpenSSL that does. Shaves off some seconds during verification stage.
2020-05-23 17:50:59 +02:00
};
#endif // ACCELERATEDCRYPTOGRAPHICHASH_H
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