Add new Base32 implementation

COPYING

@@ -214,10 +214,6 @@ Files: share/icons/database/C65_W.png
 Copyright: none
 License: public-domain
 
-Files: src/crypto/salsa20/*
-Copyright: none
-License: public-domain
-
 Files: src/streams/qtiocompressor.*
        src/streams/QtIOCompressor
        tests/modeltest.*
@@ -241,8 +237,3 @@ Files: src/gui/KMessageWidget.h
 Copyright: 2011 Aurélien Gâteau <agateau@kde.org>
            2014 Dominik Haumann <dhaumann@kde.org>
 License: LGPL-2.1
-
-Files: src/totp/base32.cpp
-       src/totp/base32.h
-Copyright: 2010 Google Inc.
-License: Apache 2.0

LICENSE.APACHE-2.0

@@ -1,201 +0,0 @@
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src/CMakeLists.txt

@@ -59,6 +59,9 @@ set(keepassx_SOURCES
     core/Tools.cpp
     core/Translator.cpp
     core/Uuid.cpp
+    core/Base32.h
+    core/Base32.cpp
+    core/Optional.h
     cli/PasswordInput.cpp
     cli/PasswordInput.h
     crypto/Crypto.cpp
@@ -138,8 +141,6 @@ set(keepassx_SOURCES
     streams/qtiocompressor.cpp
     streams/StoreDataStream.cpp
     streams/SymmetricCipherStream.cpp
-    totp/base32.h
-    totp/base32.cpp
     totp/totp.h
     totp/totp.cpp
 )

src/core/Base32.cpp

@@ -0,0 +1,285 @@
+/*
+ *  Copyright (C) 2017 KeePassXC Team <team@keepassxc.org>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 2 or (at your option)
+ *  version 3 of the License.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Conforms to RFC 4648. For details, see: https://tools.ietf.org/html/rfc4648
+ * Use the functions Base32::addPadding/1, Base32::removePadding/1 or
+ * Base32::sanitizeInput/1 to fix input or output for a particular
+ * applications (e.g. to use with Google Authenticator).
+ */
+
+#include "Base32.h"
+
+constexpr quint64 MASK_40BIT = quint64(0xF8) << 32;
+constexpr quint64 MASK_35BIT = quint64(0x7C0000000);
+constexpr quint64 MASK_25BIT = quint64(0x1F00000);
+constexpr quint64 MASK_20BIT = quint64(0xF8000);
+constexpr quint64 MASK_10BIT = quint64(0x3E0);
+
+constexpr char alphabet[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567";
+constexpr quint8 ALPH_POS_2 = 26;
+
+constexpr quint8 ASCII_2 = static_cast<quint8>('2');
+constexpr quint8 ASCII_7 = static_cast<quint8>('7');
+constexpr quint8 ASCII_A = static_cast<quint8>('A');
+constexpr quint8 ASCII_Z = static_cast<quint8>('Z');
+constexpr quint8 ASCII_a = static_cast<quint8>('a');
+constexpr quint8 ASCII_z = static_cast<quint8>('z');
+constexpr quint8 ASCII_EQ = static_cast<quint8>('=');
+
+Optional<QByteArray> Base32::decode(const QByteArray& encodedData)
+{
+    if (encodedData.size() <= 0) {
+        return Optional<QByteArray>("");
+    }
+
+    if (encodedData.size() % 8 != 0) {
+        return Optional<QByteArray>();
+    }
+
+    int nPads = 0;
+    for (int i = -1; i > -7; --i) {
+        if ('=' == encodedData[encodedData.size() + i])
+            ++nPads;
+    }
+
+    int specialOffset;
+    int nSpecialBytes;
+
+    switch (nPads) { // in {0, 1, 3, 4, 6}
+    case 1:
+        nSpecialBytes = 4;
+        specialOffset = 3;
+        break;
+    case 3:
+        nSpecialBytes = 3;
+        specialOffset = 1;
+        break;
+    case 4:
+        nSpecialBytes = 2;
+        specialOffset = 4;
+        break;
+    case 6:
+        nSpecialBytes = 1;
+        specialOffset = 2;
+        break;
+    default:
+        nSpecialBytes = 0;
+        specialOffset = 0;
+    }
+
+    Q_ASSERT(encodedData.size() > 0);
+    const int nQuanta = encodedData.size() / 8;
+    const int nBytes = (nQuanta - 1) * 5 + nSpecialBytes;
+
+    QByteArray data(nBytes, Qt::Uninitialized);
+
+    int i = 0;
+    int o = 0;
+
+    while (i < encodedData.size()) {
+        quint64 quantum = 0;
+        int nQuantumBytes = 5;
+
+        for (int n = 0; n < 8; n++) {
+            quint8 ch = static_cast<quint8>(encodedData[i++]);
+            if ((ASCII_A <= ch && ch <= ASCII_Z) || (ASCII_a <= ch && ch <= ASCII_z)) {
+                ch -= ASCII_A;
+                if (ch >= ALPH_POS_2)
+                    ch -= ASCII_a - ASCII_A;
+            } else {
+                if (ASCII_2 <= ch && ch <= ASCII_7) {
+                    ch -= ASCII_2;
+                    ch += ALPH_POS_2;
+                } else {
+                    if (ASCII_EQ == ch) {
+                        if (i == encodedData.size()) {
+                            // finished with special quantum
+                            quantum >>= specialOffset;
+                            nQuantumBytes = nSpecialBytes;
+                        }
+                        continue;
+                    } else {
+                        // illegal character
+                        return Optional<QByteArray>();
+                    }
+                }
+            }
+
+            quantum <<= 5;
+            quantum |= ch;
+        }
+
+        const int offset = (nQuantumBytes - 1) * 8;
+        quint64 mask = quint64(0xFF) << offset;
+        for (int n = offset; n >= 0; n -= 8) {
+            char c = static_cast<char>((quantum & mask) >> n);
+            data[o++] = c;
+            mask >>= 8;
+        }
+    }
+
+    return Optional<QByteArray>(data);
+}
+
+QByteArray Base32::encode(const QByteArray& data)
+{
+    if (data.size() < 1) {
+        return QByteArray();
+    }
+
+    const int nBits = data.size() * 8;
+    const int rBits = nBits % 40; // in {0, 8, 16, 24, 32}
+    const int nQuanta = nBits / 40 + (rBits > 0 ? 1 : 0);
+    QByteArray encodedData(nQuanta * 8, Qt::Uninitialized);
+
+    int i = 0;
+    int o = 0;
+    int n;
+    quint64 mask;
+    quint64 quantum;
+
+    // 40-bits of input per input group
+    while (i + 5 <= data.size()) {
+        quantum = 0;
+        for (n = 32; n >= 0; n -= 8) {
+            quantum |= (static_cast<quint64>(data[i++]) << n);
+        }
+
+        mask = MASK_40BIT;
+        int index;
+        for (n = 35; n >= 0; n -= 5) {
+            index = (quantum & mask) >> n;
+            encodedData[o++] = alphabet[index];
+            mask >>= 5;
+        }
+    }
+
+    // < 40-bits of input at final input group
+    if (i < data.size()) {
+        Q_ASSERT(rBits > 0);
+        quantum = 0;
+        for (n = rBits - 8; n >= 0; n -= 8)
+            quantum |= static_cast<quint64>(data[i++]) << n;
+
+        switch (rBits) {
+        case 8: // expand to 10 bits
+            quantum <<= 2;
+            mask = MASK_10BIT;
+            n = 5;
+            break;
+        case 16: // expand to 20 bits
+            quantum <<= 4;
+            mask = MASK_20BIT;
+            n = 15;
+            break;
+        case 24: // expand to 25 bits
+            quantum <<= 1;
+            mask = MASK_25BIT;
+            n = 20;
+            break;
+        default: // expand to 35 bits
+            Q_ASSERT(rBits == 32);
+            quantum <<= 3;
+            mask = MASK_35BIT;
+            n = 30;
+        }
+
+        while (n >= 0) {
+            int index = (quantum & mask) >> n;
+            encodedData[o++] = alphabet[index];
+            mask >>= 5;
+            n -= 5;
+        }
+
+        // add pad characters
+        while (o < encodedData.size())
+            encodedData[o++] = '=';
+    }
+
+    Q_ASSERT(encodedData.size() == o);
+    return encodedData;
+}
+
+QByteArray Base32::addPadding(const QByteArray& encodedData)
+{
+    if (encodedData.size() <= 0 || encodedData.size() % 8 == 0) {
+        return encodedData;
+    }
+
+    const int rBytes = encodedData.size() % 8;
+    // rBytes must be a member of {2, 4, 5, 7}
+    if (1 == rBytes || 3 == rBytes || 6 == rBytes) {
+        return encodedData;
+    }
+
+    QByteArray newEncodedData(encodedData);
+    for (int nPads = 8 - rBytes; nPads > 0; --nPads) {
+        newEncodedData.append('=');
+    }
+
+    return newEncodedData;
+}
+
+QByteArray Base32::removePadding(const QByteArray& encodedData)
+{
+    if (encodedData.size() <= 0 || encodedData.size() % 8 != 0) {
+        return encodedData; // return same bad input
+    }
+
+    int nPads = 0;
+    for (int i = -1; i > -7; --i) {
+        if ('=' == encodedData[encodedData.size() + i]) {
+            ++nPads;
+        }
+    }
+
+    QByteArray newEncodedData(encodedData);
+    newEncodedData.remove(encodedData.size() - nPads, nPads);
+    newEncodedData.resize(encodedData.size() - nPads);
+
+    return newEncodedData;
+}
+
+QByteArray Base32::sanitizeInput(const QByteArray& encodedData)
+{
+    if (encodedData.size() <= 0) {
+        return encodedData;
+    }
+
+    QByteArray newEncodedData(encodedData.size(), Qt::Uninitialized);
+    int i = 0;
+    for (auto ch : encodedData) {
+        switch (ch) {
+        case '0':
+            newEncodedData[i++] = 'O';
+            break;
+        case '1':
+            newEncodedData[i++] = 'L';
+            break;
+        case '8':
+            newEncodedData[i++] = 'B';
+            break;
+        default:
+            if (('A' <= ch && ch <= 'Z') || ('a' <= ch && ch <= 'z') || ('2' <= ch && ch <= '7')) {
+                newEncodedData[i++] = ch;
+            }
+        }
+    }
+    newEncodedData.resize(i);
+
+    return addPadding(newEncodedData);
+}

src/core/Base32.h

@@ -0,0 +1,42 @@
+/*
+ *  Copyright (C) 2017 KeePassXC Team <team@keepassxc.org>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 2 or (at your option)
+ *  version 3 of the License.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Conforms to RFC 4648. For details, see: https://tools.ietf.org/html/rfc4648
+ * Use the functions Base32::addPadding/1, Base32::removePadding/1 or
+ * Base32::sanitizeInput/1 to fix input or output for a particular
+ * applications (e.g. to use with Google Authenticator).
+ */
+
+#ifndef BASE32_H
+#define BASE32_H
+
+#include "Optional.h"
+#include <QByteArray>
+#include <QtCore/qglobal.h>
+
+class Base32
+{
+public:
+    Base32() = default;
+    Q_REQUIRED_RESULT static Optional<QByteArray> decode(const QByteArray&);
+    Q_REQUIRED_RESULT static QByteArray encode(const QByteArray&);
+    Q_REQUIRED_RESULT static QByteArray addPadding(const QByteArray&);
+    Q_REQUIRED_RESULT static QByteArray removePadding(const QByteArray&);
+    Q_REQUIRED_RESULT static QByteArray sanitizeInput(const QByteArray&);
+};
+
+#endif // BASE32_H

src/core/Optional.h

@@ -0,0 +1,86 @@
+/*
+ *  Copyright (C) 2017 KeePassXC Team <team@keepassxc.org>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 2 or (at your option)
+ *  version 3 of the License.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef OPTIONAL_H
+#define OPTIONAL_H
+
+/*
+ * This utility class is for providing basic support for an option type.
+ * It can be replaced by std::optional (C++17) or
+ * std::experimental::optional (C++11) when they become fully supported
+ * by all the main compiler toolchains.
+ */
+
+template <typename T> class Optional
+{
+public:
+    // None
+    Optional()
+        : m_hasValue(false)
+        , m_value(){};
+
+    // Some T
+    Optional(const T& value)
+        : m_hasValue(true)
+        , m_value(value){};
+
+    // Copy
+    Optional(const Optional& other)
+        : m_hasValue(other.m_hasValue)
+        , m_value(other.m_value){};
+
+    const Optional& operator=(const Optional& other)
+    {
+        m_hasValue = other.m_hasValue;
+        m_value = other.m_value;
+        return *this;
+    }
+
+    bool operator==(const Optional& other) const
+    {
+        if (m_hasValue)
+            return other.m_hasValue && m_value == other.m_value;
+        else
+            return !other.m_hasValue;
+    }
+
+    bool operator!=(const Optional& other) const
+    {
+        return !(*this == other);
+    }
+
+    bool hasValue() const
+    {
+        return m_hasValue;
+    }
+
+    T valueOr(const T& other) const
+    {
+        return m_hasValue ? m_value : other;
+    }
+
+    Optional static makeOptional(const T& value)
+    {
+        return Optional(value);
+    }
+
+private:
+    bool m_hasValue;
+    T m_value;
+};
+
+#endif // OPTIONAL_H

src/totp/base32.cpp

@@ -1,68 +0,0 @@
-// Base32 implementation
-// Source: https://github.com/google/google-authenticator-libpam/blob/master/src/base32.c
-//
-// Copyright 2010 Google Inc.
-// Author: Markus Gutschke
-// Modifications Copyright 2017 KeePassXC team <team@keepassxc.org>
-//
-// Licensed 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
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "base32.h"
-
-Base32::Base32()
-{
-}
-
-QByteArray Base32::base32_decode(const QByteArray encoded)
-{
-    QByteArray result;
-
-    int buffer = 0;
-    int bitsLeft = 0;
-
-    for (char ch : encoded) {
-        if (ch == 0 || ch == ' ' || ch == '\t' || ch == '\r' || ch == '\n' || ch == '-' || ch == '=') {
-            continue;
-        }
-
-        buffer <<= 5;
-
-        // Deal with commonly mistyped characters
-        if (ch == '0') {
-            ch = 'O';
-        } else if (ch == '1') {
-            ch = 'L';
-        } else if (ch == '8') {
-            ch = 'B';
-        }
-
-        // Look up one base32 digit
-        if ((ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z')) {
-            ch = (ch & 0x1F) - 1;
-        } else if (ch >= '2' && ch <= '7') {
-            ch -= '2' - 26;
-        } else {
-            return QByteArray();
-        }
-
-        buffer |= ch;
-        bitsLeft += 5;
-
-        if (bitsLeft >= 8) {
-            result.append(static_cast<char> (buffer >> (bitsLeft - 8)));
-            bitsLeft -= 8;
-        }
-    }
-
-    return result;
-}

src/totp/base32.h

@@ -1,34 +0,0 @@
-// Base32 implementation
-// Source: https://github.com/google/google-authenticator-libpam/blob/master/src/base32.h
-//
-// Copyright 2010 Google Inc.
-// Author: Markus Gutschke
-// Modifications Copyright 2017 KeePassXC team <team@keepassxc.org>
-//
-// Licensed 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
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef BASE32_H
-#define BASE32_H
-
-#include <QtCore/qglobal.h>
-#include <QByteArray>
-
-class Base32
-{
-public:
-    Base32();
-    static QByteArray base32_decode(const QByteArray encoded);
-};
-
-
-#endif //BASE32_H

src/totp/totp.cpp

@@ -17,16 +17,15 @@
  */
 
 #include "totp.h"
-#include "base32.h"
+#include "core/Base32.h"
-#include <cmath>
-#include <QtEndian>
-#include <QRegExp>
-#include <QDateTime>
 #include <QCryptographicHash>
+#include <QDateTime>
 #include <QMessageAuthenticationCode>
+#include <QRegExp>
 #include <QUrl>
 #include <QUrlQuery>
-
+#include <QtEndian>
+#include <cmath>
 
 const quint8 QTotp::defaultStep = 30;
 const quint8 QTotp::defaultDigits = 6;
@@ -58,7 +57,6 @@ QString QTotp::parseOtpString(QString key, quint8 &digits, quint8 &step)
             step = q_step;
         }
 
-
     } else {
         // Compatibility with "KeeOtp" plugin string format
         QRegExp rx("key=(.+)", Qt::CaseInsensitive, QRegExp::RegExp);
@@ -93,30 +91,53 @@ QString QTotp::parseOtpString(QString key, quint8 &digits, quint8 &step)
     return seed;
 }
 
-QString QTotp::generateTotp(const QByteArray key, quint64 time,
+QString QTotp::generateTotp(const QByteArray key,
-                            const quint8 numDigits = defaultDigits, const quint8 step = defaultStep)
+                            quint64 time,
+                            const quint8 numDigits = defaultDigits,
+                            const quint8 step = defaultStep)
 {
     quint64 current = qToBigEndian(time / step);
 
-    QByteArray secret = Base32::base32_decode(key);
+    Optional<QByteArray> secret = Base32::decode(Base32::sanitizeInput(key));
-    if (secret.isEmpty()) {
+    if (!secret.hasValue()) {
         return "Invalid TOTP secret key";
     }
 
     QMessageAuthenticationCode code(QCryptographicHash::Sha1);
-    code.setKey(secret);
+    code.setKey(secret.valueOr(""));
     code.addData(QByteArray(reinterpret_cast<char*>(&current), sizeof(current)));
     QByteArray hmac = code.result();
 
     int offset = (hmac[hmac.length() - 1] & 0xf);
-    int binary =
+    int binary = ((hmac[offset] & 0x7f) << 24) | ((hmac[offset + 1] & 0xff) << 16) | ((hmac[offset + 2] & 0xff) << 8) |
-            ((hmac[offset] & 0x7f) << 24)
+                 (hmac[offset + 3] & 0xff);
-            | ((hmac[offset + 1] & 0xff) << 16)
-            | ((hmac[offset + 2] & 0xff) << 8)
-            | (hmac[offset + 3] & 0xff);
 
     quint32 digitsPower = pow(10, numDigits);
 
     quint64 password = binary % digitsPower;
     return QString("%1").arg(password, numDigits, 10, QChar('0'));
 }
+
+// See: https://github.com/google/google-authenticator/wiki/Key-Uri-Format
+QUrl QTotp::generateOtpString(const QString& secret,
+                              const QString& type,
+                              const QString& issuer,
+                              const QString& username,
+                              const QString& algorithm,
+                              const quint8& digits,
+                              const quint8& step)
+{
+    QUrl keyUri;
+    keyUri.setScheme("otpauth");
+    keyUri.setHost(type);
+    keyUri.setPath(QString("/%1:%2").arg(issuer).arg(username));
+    QUrlQuery parameters;
+    parameters.addQueryItem("secret", secret);
+    parameters.addQueryItem("issuer", issuer);
+    parameters.addQueryItem("algorithm", algorithm);
+    parameters.addQueryItem("digits", QString::number(digits));
+    parameters.addQueryItem("period", QString::number(step));
+    keyUri.setQuery(parameters);
+
+    return keyUri;
+}

src/totp/totp.h

@@ -21,12 +21,21 @@
 
 #include <QtCore/qglobal.h>
 
+class QUrl;
+
 class QTotp
 {
 public:
     QTotp();
     static QString parseOtpString(QString rawSecret, quint8& digits, quint8& step);
     static QString generateTotp(const QByteArray key, quint64 time, const quint8 numDigits, const quint8 step);
+    static QUrl generateOtpString(const QString& secret,
+                                  const QString& type,
+                                  const QString& issuer,
+                                  const QString& username,
+                                  const QString& algorithm,
+                                  const quint8& digits,
+                                  const quint8& step);
     static const quint8 defaultStep;
     static const quint8 defaultDigits;
 };

tests/CMakeLists.txt

@@ -161,6 +161,9 @@ add_unit_test(NAME testentry SOURCES TestEntry.cpp
 add_unit_test(NAME testtotp SOURCES TestTotp.cpp
               LIBS ${TEST_LIBRARIES})
 
+add_unit_test(NAME testbase32 SOURCES TestBase32.cpp
+              LIBS ${TEST_LIBRARIES})
+
 add_unit_test(NAME testcsvparser SOURCES TestCsvParser.cpp
               LIBS ${TEST_LIBRARIES})
 

tests/TestBase32.cpp

@@ -0,0 +1,278 @@
+/*
+ *  Copyright (C) 2017 KeePassXC Team <team@keepassxc.org>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 2 or (at your option)
+ *  version 3 of the License.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "TestBase32.h"
+#include "core/Base32.h"
+#include <QTest>
+
+QTEST_GUILESS_MAIN(TestBase32)
+
+void TestBase32::testDecode()
+{
+    // 3 quanta, all upper case + padding
+    QByteArray encodedData = "JBSWY3DPEB3W64TMMQXC4LQ=";
+    auto data = Base32::decode(encodedData);
+    QCOMPARE(QString::fromLatin1(data.valueOr("ERROR")), QString("Hello world..."));
+
+    // 4 quanta, all upper case
+    encodedData = "GEZDGNBVGY3TQOJQGEZDGNBVGY3TQOJQ";
+    data = Base32::decode(encodedData);
+    QCOMPARE(QString::fromLatin1(data.valueOr("ERROR")), QString("12345678901234567890"));
+
+    // 4 quanta, all lower case
+    encodedData = "gezdgnbvgy3tqojqgezdgnbvgy3tqojq";
+    data = Base32::decode(encodedData);
+    QCOMPARE(QString::fromLatin1(data.valueOr("ERROR")), QString("12345678901234567890"));
+
+    // 4 quanta, mixed upper and lower case
+    encodedData = "Gezdgnbvgy3tQojqgezdGnbvgy3tQojQ";
+    data = Base32::decode(encodedData);
+    QCOMPARE(QString::fromLatin1(data.valueOr("ERROR")), QString("12345678901234567890"));
+
+    // 1 pad characters
+    encodedData = "ORSXG5A=";
+    data = Base32::decode(encodedData);
+    QCOMPARE(QString::fromLatin1(data.valueOr("ERROR")), QString("test"));
+
+    // 3 pad characters
+    encodedData = "L5PV6===";
+    data = Base32::decode(encodedData);
+    QCOMPARE(QString::fromLatin1(data.valueOr("ERROR")), QString("___"));
+
+    // 4 pad characters
+    encodedData = "MZXW6IDCMFZA====";
+    data = Base32::decode(encodedData);
+    QCOMPARE(QString::fromLatin1(data.valueOr("ERROR")), QString("foo bar"));
+
+    // six pad characters
+    encodedData = "MZXW6YTBOI======";
+    data = Base32::decode(encodedData);
+    QCOMPARE(QString::fromLatin1(data.valueOr("ERROR")), QString("foobar"));
+
+    encodedData = "IA======";
+    data = Base32::decode(encodedData);
+    QCOMPARE(QString::fromLatin1(data.valueOr("ERROR")), QString("@"));
+
+    // error: illegal character
+    encodedData = "1MZXW6YTBOI=====";
+    data = Base32::decode(encodedData);
+    QCOMPARE(QString::fromLatin1(data.valueOr("ERROR")), QString("ERROR"));
+
+    // error: missing pad character
+    encodedData = "MZXW6YTBOI=====";
+    data = Base32::decode(encodedData);
+    QCOMPARE(QString::fromLatin1(data.valueOr("ERROR")), QString("ERROR"));
+
+    // RFC 4648 test vectors
+    encodedData = "";
+    data = Base32::decode(encodedData);
+    QCOMPARE(QString::fromLatin1(data.valueOr("ERROR")), QString(""));
+
+    encodedData = "MY======";
+    data = Base32::decode(encodedData);
+    QCOMPARE(QString::fromLatin1(data.valueOr("ERROR")), QString("f"));
+
+    encodedData = "MZXQ====";
+    data = Base32::decode(encodedData);
+    QCOMPARE(QString::fromLatin1(data.valueOr("ERROR")), QString("fo"));
+
+    encodedData = "MZXW6===";
+    data = Base32::decode(encodedData);
+    QCOMPARE(QString::fromLatin1(data.valueOr("ERROR")), QString("foo"));
+
+    encodedData = "MZXW6YQ=";
+    data = Base32::decode(encodedData);
+    QCOMPARE(QString::fromLatin1(data.valueOr("ERROR")), QString("foob"));
+
+    encodedData = "MZXW6YTB";
+    data = Base32::decode(encodedData);
+    QCOMPARE(QString::fromLatin1(data.valueOr("ERROR")), QString("fooba"));
+
+    encodedData = "MZXW6YTBOI======";
+    data = Base32::decode(encodedData);
+    QCOMPARE(QString::fromLatin1(data.valueOr("ERROR")), QString("foobar"));
+}
+
+void TestBase32::testEncode()
+{
+    QByteArray data = "Hello world...";
+    QByteArray encodedData = Base32::encode(data);
+    QCOMPARE(encodedData, QByteArray("JBSWY3DPEB3W64TMMQXC4LQ="));
+
+    data = "12345678901234567890";
+    encodedData = Base32::encode(data);
+    QCOMPARE(encodedData, QByteArray("GEZDGNBVGY3TQOJQGEZDGNBVGY3TQOJQ"));
+
+    data = "012345678901234567890";
+    encodedData = Base32::encode(data);
+    QCOMPARE(encodedData, QByteArray("GAYTEMZUGU3DOOBZGAYTEMZUGU3DOOBZGA======"));
+
+    data = "test";
+    encodedData = Base32::encode(data);
+    QCOMPARE(encodedData, QByteArray("ORSXG5A="));
+
+    data = "___";
+    encodedData = Base32::encode(data);
+    QCOMPARE(encodedData, QByteArray("L5PV6==="));
+
+    data = "foo bar";
+    encodedData = Base32::encode(data);
+    QCOMPARE(encodedData, QByteArray("MZXW6IDCMFZA===="));
+
+    data = "@";
+    encodedData = Base32::encode(data);
+    QCOMPARE(encodedData, QByteArray("IA======"));
+
+    // RFC 4648 test vectors
+    data = "";
+    encodedData = Base32::encode(data);
+    QCOMPARE(encodedData, QByteArray(""));
+
+    data = "f";
+    encodedData = Base32::encode(data);
+    QCOMPARE(encodedData, QByteArray("MY======"));
+
+    data = "fo";
+    encodedData = Base32::encode(data);
+    QCOMPARE(encodedData, QByteArray("MZXQ===="));
+
+    data = "foo";
+    encodedData = Base32::encode(data);
+    QCOMPARE(encodedData, QByteArray("MZXW6==="));
+
+    data = "foob";
+    encodedData = Base32::encode(data);
+    QCOMPARE(encodedData, QByteArray("MZXW6YQ="));
+
+    data = "fooba";
+    encodedData = Base32::encode(data);
+    QCOMPARE(encodedData, QByteArray("MZXW6YTB"));
+
+    data = "foobar";
+    encodedData = Base32::encode(data);
+    QCOMPARE(encodedData, QByteArray("MZXW6YTBOI======"));
+}
+
+void TestBase32::testAddPadding()
+{
+    // Empty. Invalid, returns input.
+    QByteArray data = "";
+    QByteArray paddedData = Base32::addPadding(data);
+    QCOMPARE(paddedData, data);
+
+    // One byte of encoded data. Invalid, returns input.
+    data = "B";
+    paddedData = Base32::addPadding(data);
+    QCOMPARE(paddedData, data);
+
+    // Two bytes of encoded data.
+    data = "BB";
+    paddedData = Base32::addPadding(data);
+    QCOMPARE(paddedData, QByteArray("BB======"));
+
+    // Three bytes of encoded data. Invalid, returns input.
+    data = "BBB";
+    paddedData = Base32::addPadding(data);
+    QCOMPARE(paddedData, data);
+
+    // Four bytes of encoded data.
+    data = "BBBB";
+    paddedData = Base32::addPadding(data);
+    QCOMPARE(paddedData, QByteArray("BBBB===="));
+
+    // Five bytes of encoded data.
+    data = "BBBBB";
+    paddedData = Base32::addPadding(data);
+    QCOMPARE(paddedData, QByteArray("BBBBB==="));
+
+    // Six bytes of encoded data. Invalid, returns input.
+    data = "BBBBBB";
+    paddedData = Base32::addPadding(data);
+    QCOMPARE(paddedData, data);
+
+    // Seven bytes of encoded data.
+    data = "BBBBBBB";
+    paddedData = Base32::addPadding(data);
+    QCOMPARE(paddedData, QByteArray("BBBBBBB="));
+
+    // Eight bytes of encoded data. Valid, but returns same as input.
+    data = "BBBBBBBB";
+    paddedData = Base32::addPadding(data);
+    QCOMPARE(paddedData, data);
+
+    // More than eight bytes (8+5).
+    data = "AAAAAAAABBBBB";
+    paddedData = Base32::addPadding(data);
+    QCOMPARE(paddedData, QByteArray("AAAAAAAABBBBB==="));
+}
+
+void TestBase32::testRemovePadding()
+{
+    QByteArray data = "";
+    QByteArray unpaddedData = Base32::removePadding(data);
+    QCOMPARE(unpaddedData, data);
+
+    data = "AAAAAAAABB======";
+    unpaddedData = Base32::removePadding(data);
+    QCOMPARE(unpaddedData, QByteArray("AAAAAAAABB"));
+
+    data = "BBBB====";
+    unpaddedData = Base32::removePadding(data);
+    QCOMPARE(unpaddedData, QByteArray("BBBB"));
+
+    data = "AAAAAAAABBBBB===";
+    unpaddedData = Base32::removePadding(data);
+    QCOMPARE(unpaddedData, QByteArray("AAAAAAAABBBBB"));
+
+    data = "BBBBBBB=";
+    unpaddedData = Base32::removePadding(data);
+    QCOMPARE(unpaddedData, QByteArray("BBBBBBB"));
+
+    // Invalid: 7 bytes of data. Returns same as input.
+    data = "IIIIIII";
+    unpaddedData = Base32::removePadding(data);
+    QCOMPARE(unpaddedData, data);
+
+    // Invalid: more padding than necessary. Returns same as input.
+    data = "AAAAAAAABBBB=====";
+    unpaddedData = Base32::removePadding(data);
+    QCOMPARE(unpaddedData, data);
+}
+
+void TestBase32::testSanitizeInput()
+{
+    // sanitize input (white space + missing padding)
+    QByteArray encodedData = "JBSW Y3DP EB3W 64TM MQXC 4LQA";
+    auto data = Base32::decode(Base32::sanitizeInput(encodedData));
+    QCOMPARE(QString::fromLatin1(data.valueOr("ERRROR")), QString("Hello world..."));
+
+    // sanitize input (typo + missing padding)
+    encodedData = "J8SWY3DPE83W64TMMQXC4LQA";
+    data = Base32::decode(Base32::sanitizeInput(encodedData));
+    QCOMPARE(QString::fromLatin1(data.valueOr("ERRROR")), QString("Hello world..."));
+
+    // sanitize input (other illegal characters)
+    encodedData = "J8SWY3D[PE83W64TMMQ]XC!4LQA";
+    data = Base32::decode(Base32::sanitizeInput(encodedData));
+    QCOMPARE(QString::fromLatin1(data.valueOr("ERRROR")), QString("Hello world..."));
+
+    // sanitize input (NUL character)
+    encodedData = "J8SWY3DPE83W64TMMQXC4LQA";
+    encodedData.insert(3, '\0');
+    data = Base32::decode(Base32::sanitizeInput(encodedData));
+    QCOMPARE(QString::fromLatin1(data.valueOr("ERRROR")), QString("Hello world..."));
+}

tests/TestBase32.h

@@ -0,0 +1,37 @@
+/*
+ *  Copyright (C) 2017 KeePassXC Team <team@keepassxc.org>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 2 or (at your option)
+ *  version 3 of the License.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef KEEPASSX_TESTBASE32_H
+#define KEEPASSX_TESTBASE32_H
+
+#include <QObject>
+
+class Base32;
+
+class TestBase32 : public QObject
+{
+    Q_OBJECT
+
+private slots:
+    void testEncode();
+    void testDecode();
+    void testAddPadding();
+    void testRemovePadding();
+    void testSanitizeInput();
+};
+
+#endif // KEEPASSX_TESTBASE32_H

tests/TestTotp.cpp

@@ -18,15 +18,14 @@
 
 #include "TestTotp.h"
 
-#include <QTest>
-#include <QTime>
 #include <QDateTime>
-#include <QtEndian>
+#include <QTest>
 #include <QTextCodec>
+#include <QTime>
+#include <QtEndian>
 
 #include "crypto/Crypto.h"
 #include "totp/totp.h"
-#include "totp/base32.h"
 
 QTEST_GUILESS_MAIN(TestTotp)
 
@@ -35,12 +34,13 @@ void TestTotp::initTestCase()
     QVERIFY(Crypto::init());
 }
 
-
 void TestTotp::testParseSecret()
 {
     quint8 digits = 0;
     quint8 step = 0;
-    QString secret = "otpauth://totp/ACME%20Co:john@example.com?secret=HXDMVJECJJWSRB3HWIZR4IFUGFTMXBOZ&issuer=ACME%20Co&algorithm=SHA1&digits=6&period=30";
+    QString secret = "otpauth://totp/"
+                     "ACME%20Co:john@example.com?secret=HXDMVJECJJWSRB3HWIZR4IFUGFTMXBOZ&issuer=ACME%20Co&algorithm="
+                     "SHA1&digits=6&period=30";
     QCOMPARE(QTotp::parseOtpString(secret, digits, step), QString("HXDMVJECJJWSRB3HWIZR4IFUGFTMXBOZ"));
     QCOMPARE(digits, quint8(6));
     QCOMPARE(step, quint8(30));
@@ -60,25 +60,6 @@ void TestTotp::testParseSecret()
     QCOMPARE(step, quint8(30));
 }
 
-void TestTotp::testBase32()
-{
-    QByteArray key = QString("JBSW Y3DP EB3W 64TM MQXC 4LQA").toLatin1();
-    QByteArray secret = Base32::base32_decode(key);
-    QCOMPARE(QString::fromLatin1(secret), QString("Hello world..."));
-
-    key = QString("gezdgnbvgy3tqojqgezdgnbvgy3tqojq").toLatin1();
-    secret = Base32::base32_decode(key);
-    QCOMPARE(QString::fromLatin1(secret), QString("12345678901234567890"));
-
-    key = QString("ORSXG5A=").toLatin1();
-    secret = Base32::base32_decode(key);
-    QCOMPARE(QString::fromLatin1(secret), QString("test"));
-
-    key = QString("MZXW6YTBOI======").toLatin1();
-    secret = Base32::base32_decode(key);
-    QCOMPARE(QString::fromLatin1(secret), QString("foobar"));
-}
-
 void TestTotp::testTotpCode()
 {
     // Test vectors from RFC 6238

tests/TestTotp.h

@@ -30,7 +30,6 @@ class TestTotp : public QObject
 private slots:
     void initTestCase();
     void testParseSecret();
-    void testBase32();
     void testTotpCode();
 };