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// Copyright 2005-2019 The Mumble Developers. All rights reserved.
// Use of this source code is governed by a BSD-style license
// that can be found in the LICENSE file at the root of the
// Mumble source tree or at <https://www.mumble.info/LICENSE>.
#include "CryptographicHash.h"
#include <QtCore/QString>
#include <openssl/evp.h>
class CryptographicHashPrivate {
public:
CryptographicHashPrivate(const EVP_MD *type);
~CryptographicHashPrivate();
void addData(const QByteArray &buf);
QByteArray result();
private:
EVP_MD_CTX *m_mdctx;
/// The result of the cryptographic hash.
/// This field is filled out by the result()
/// method.
/// Once this field is set, the m_mdctx is finalized
/// and can't be used anymore, so result() and addData()
/// must guard against that possibility.
QByteArray m_result;
CryptographicHashPrivate();
/// If m_mdctx is set, cleanupMdctx will destroy
/// the EVP_MD_CTX object and set m_mdctx to NULL.
void cleanupMdctx();
};
CryptographicHashPrivate::CryptographicHashPrivate()
: m_mdctx(NULL) {
}
void CryptographicHashPrivate::cleanupMdctx() {
if (m_mdctx) {
EVP_MD_CTX_destroy(m_mdctx);
m_mdctx = NULL;
}
}
CryptographicHashPrivate::CryptographicHashPrivate(const EVP_MD *type)
: m_mdctx(NULL) {
m_mdctx = EVP_MD_CTX_create();
if (m_mdctx == NULL) {
return;
}
int err = EVP_DigestInit_ex(m_mdctx, type, NULL);
if (err != 1) {
cleanupMdctx();
return;
}
}
CryptographicHashPrivate::~CryptographicHashPrivate() {
cleanupMdctx();
}
void CryptographicHashPrivate::addData(const QByteArray &buf) {
if (m_mdctx == NULL) {
return;
}
// If we have a result already, that means our m_mdctx
// object has been finalized, and can't be used anymore.
// In that case, transition into an error state by cleaning
// up the mdctx -- that way, subsequent calls to result()
// will return an empty QByteArray.
if (!m_result.isNull()) {
cleanupMdctx();
return;
}
int err = EVP_DigestUpdate(m_mdctx, buf.constData(), buf.size());
if (err != 1) {
cleanupMdctx();
}
}
QByteArray CryptographicHashPrivate::result() {
if (m_mdctx == NULL) {
return QByteArray();
}
// If we have a result already, that means our m_mdctx
// object has been finalized, and can't be used anymore.
// In that case, just return the already computed result.
if (!m_result.isNull()) {
return m_result;
}
QByteArray digest(EVP_MD_CTX_size(m_mdctx), '\0');
int err = EVP_DigestFinal_ex(m_mdctx, reinterpret_cast<unsigned char *>(digest.data()), NULL);
if (err != 1) {
cleanupMdctx();
return QByteArray();
}
m_result = digest;
return m_result;
}
QByteArray CryptographicHash::hash(const QByteArray &buf, Algorithm algo) {
CryptographicHash h(algo);
h.addData(buf);
return h.result();
}
QString CryptographicHash::humanReadableAlgorithmName(CryptographicHash::Algorithm algo) {
switch (algo) {
case CryptographicHash::Sha1:
return QLatin1String("SHA-1");
case CryptographicHash::Sha256:
return QLatin1String("SHA-256");
}
return QString();
}
QString CryptographicHash::shortAlgorithmName(CryptographicHash::Algorithm algo) {
switch (algo) {
case CryptographicHash::Sha1:
return QLatin1String("sha1");
case CryptographicHash::Sha256:
return QLatin1String("sha256");
}
return QString();
}
CryptographicHash::CryptographicHash()
: d(NULL) {
}
CryptographicHash::CryptographicHash(CryptographicHash::Algorithm algo)
: d(NULL) {
switch (algo) {
case CryptographicHash::Sha1:
d = new CryptographicHashPrivate(EVP_sha1());
break;
case CryptographicHash::Sha256:
d = new CryptographicHashPrivate(EVP_sha256());
break;
}
}
void CryptographicHash::addData(const QByteArray &buf) {
if (d) {
d->addData(buf);
}
}
QByteArray CryptographicHash::result() const {
if (d) {
return d->result();
}
return QByteArray();
}
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