1 files changed, 180 insertions, 0 deletions
diff --git a/svl/source/misc/PasswordHelper.cxx b/svl/source/misc/PasswordHelper.cxx
new file mode 100644
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+++ b/svl/source/misc/PasswordHelper.cxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+
+#include <svl/PasswordHelper.hxx>
+#include <comphelper/hash.hxx>
+#include <rtl/digest.h>
+#include <memory>
+#include <unicode/regex.h>
+#include <unicode/unistr.h>
+#include <unicode/errorcode.h>
+#include <zxcvbn.h>
+#include <sal/log.hxx>
+
+using namespace com::sun::star;
+
+void SvPasswordHelper::GetHashPasswordSHA256(uno::Sequence<sal_Int8>& rPassHash, std::u16string_view rPassword)
+{
+    OString const tmp(OUStringToOString(rPassword, RTL_TEXTENCODING_UTF8));
+    ::std::vector<unsigned char> const hash(::comphelper::Hash::calculateHash(
+        reinterpret_cast<unsigned char const*>(tmp.getStr()), tmp.getLength(),
+        ::comphelper::HashType::SHA256));
+    rPassHash.realloc(hash.size());
+    ::std::copy(hash.begin(), hash.end(), rPassHash.getArray());
+    rtl_secureZeroMemory(const_cast<char *>(tmp.getStr()), tmp.getLength());
+}
+
+void SvPasswordHelper::GetHashPasswordSHA1UTF8(uno::Sequence<sal_Int8>& rPassHash, std::u16string_view rPassword)
+{
+    OString const tmp(OUStringToOString(rPassword, RTL_TEXTENCODING_UTF8));
+    ::std::vector<unsigned char> const hash(::comphelper::Hash::calculateHash(
+        reinterpret_cast<unsigned char const*>(tmp.getStr()), tmp.getLength(),
+        ::comphelper::HashType::SHA1));
+    rPassHash.realloc(hash.size());
+    ::std::copy(hash.begin(), hash.end(), rPassHash.getArray());
+    rtl_secureZeroMemory(const_cast<char *>(tmp.getStr()), tmp.getLength());
+}
+
+void SvPasswordHelper::GetHashPassword(uno::Sequence<sal_Int8>& rPassHash, const char* pPass, sal_uInt32 nLen)
+{
+    rPassHash.realloc(RTL_DIGEST_LENGTH_SHA1);
+
+    rtlDigestError aError = rtl_digest_SHA1 (pPass, nLen, reinterpret_cast<sal_uInt8*>(rPassHash.getArray()), rPassHash.getLength());
+    if (aError != rtl_Digest_E_None)
+    {
+        rPassHash.realloc(0);
+    }
+}
+
+void SvPasswordHelper::GetHashPasswordLittleEndian(uno::Sequence<sal_Int8>& rPassHash, std::u16string_view sPass)
+{
+    sal_Int32 nSize(sPass.size());
+    std::unique_ptr<char[]> pCharBuffer(new char[nSize * sizeof(sal_Unicode)]);
+
+    for (sal_Int32 i = 0; i < nSize; ++i)
+    {
+        sal_Unicode ch(sPass[ i ]);
+        pCharBuffer[2 * i] = static_cast< char >(ch & 0xFF);
+        pCharBuffer[2 * i + 1] = static_cast< char >(ch >> 8);
+    }
+
+    GetHashPassword(rPassHash, pCharBuffer.get(), nSize * sizeof(sal_Unicode));
+    rtl_secureZeroMemory(pCharBuffer.get(), nSize * sizeof(sal_Unicode));
+}
+
+void SvPasswordHelper::GetHashPasswordBigEndian(uno::Sequence<sal_Int8>& rPassHash, std::u16string_view sPass)
+{
+    sal_Int32 nSize(sPass.size());
+    std::unique_ptr<char[]> pCharBuffer(new char[nSize * sizeof(sal_Unicode)]);
+
+    for (sal_Int32 i = 0; i < nSize; ++i)
+    {
+        sal_Unicode ch(sPass[ i ]);
+        pCharBuffer[2 * i] = static_cast< char >(ch >> 8);
+        pCharBuffer[2 * i + 1] = static_cast< char >(ch & 0xFF);
+    }
+
+    GetHashPassword(rPassHash, pCharBuffer.get(), nSize * sizeof(sal_Unicode));
+    rtl_secureZeroMemory(pCharBuffer.get(), nSize * sizeof(sal_Unicode));
+}
+
+void SvPasswordHelper::GetHashPassword(uno::Sequence<sal_Int8>& rPassHash, std::u16string_view sPass)
+{
+    GetHashPasswordLittleEndian(rPassHash, sPass);
+}
+
+bool SvPasswordHelper::CompareHashPassword(const uno::Sequence<sal_Int8>& rOldPassHash, std::u16string_view sNewPass)
+{
+    bool bResult = false;
+
+    if (rOldPassHash.getLength() == RTL_DIGEST_LENGTH_SHA1)
+    {
+        uno::Sequence<sal_Int8> aNewPass(RTL_DIGEST_LENGTH_SHA1);
+        GetHashPasswordSHA1UTF8(aNewPass, sNewPass);
+        if (aNewPass == rOldPassHash)
+        {
+            bResult = true;
+        }
+        else
+        {
+            GetHashPasswordLittleEndian(aNewPass, sNewPass);
+            if (aNewPass == rOldPassHash)
+                bResult = true;
+            else
+            {
+                GetHashPasswordBigEndian(aNewPass, sNewPass);
+                bResult = (aNewPass == rOldPassHash);
+            }
+        }
+    }
+    else if (rOldPassHash.getLength() == 32)
+    {
+        uno::Sequence<sal_Int8> aNewPass;
+        GetHashPasswordSHA256(aNewPass, sNewPass);
+        bResult = aNewPass == rOldPassHash;
+    }
+
+    return bResult;
+}
+
+double SvPasswordHelper::GetPasswordStrengthPercentage(const char* pPassword)
+{
+    // Entropy bits corresponding to 100% password strength
+    static constexpr double fMaxPassStrengthEntorpyBits = 112.0;
+    return std::min(100.0,
+                    ZxcvbnMatch(pPassword, nullptr, nullptr) * 100.0 / fMaxPassStrengthEntorpyBits);
+}
+
+double SvPasswordHelper::GetPasswordStrengthPercentage(const OUString& aPassword)
+{
+    OString aPasswordUtf8 = aPassword.toUtf8();
+    return GetPasswordStrengthPercentage(aPasswordUtf8.getStr());
+}
+
+bool SvPasswordHelper::PasswordMeetsPolicy(const char* pPassword,
+                                           const std::optional<OUString>& oPasswordPolicy)
+{
+    if (oPasswordPolicy)
+    {
+        icu::ErrorCode aStatus;
+        icu::UnicodeString sPassword(pPassword);
+        icu::UnicodeString sRegex(oPasswordPolicy->getStr());
+        icu::RegexMatcher aRegexMatcher(sRegex, sPassword, 0, aStatus);
+
+        if (aRegexMatcher.matches(aStatus))
+            return true;
+
+        SAL_WARN_IF(
+            aStatus.isFailure(), "svl.misc",
+            "Password policy regular expression failed with error: " << aStatus.errorName());
+
+        return false;
+    }
+    return true;
+}
+
+bool SvPasswordHelper::PasswordMeetsPolicy(const OUString& aPassword,
+                                           const std::optional<OUString>& oPasswordPolicy)
+{
+    OString aPasswordUtf8 = aPassword.toUtf8();
+    return PasswordMeetsPolicy(aPasswordUtf8.getStr(), oPasswordPolicy);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */