Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 843 insertions, 0 deletions

diff --git a/oox/source/crypto/AgileEngine.cxx b/oox/source/crypto/AgileEngine.cxx
new file mode 100644
index 000000000..f75184981
--- /dev/null
+++ b/oox/source/crypto/AgileEngine.cxx
@@ -0,0 +1,843 @@
+/* -*- 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/.
+ *
+ */
+
+#include <oox/crypto/AgileEngine.hxx>
+
+#include <oox/helper/binaryinputstream.hxx>
+#include <oox/helper/binaryoutputstream.hxx>
+
+#include <sax/tools/converter.hxx>
+
+#include <comphelper/hash.hxx>
+#include <comphelper/docpasswordhelper.hxx>
+#include <comphelper/random.hxx>
+#include <comphelper/processfactory.hxx>
+#include <comphelper/base64.hxx>
+#include <comphelper/sequence.hxx>
+
+#include <filter/msfilter/mscodec.hxx>
+#include <tools/stream.hxx>
+#include <tools/XmlWriter.hxx>
+#include <sax/fastattribs.hxx>
+
+#include <com/sun/star/xml/sax/XFastParser.hpp>
+#include <com/sun/star/xml/sax/XFastTokenHandler.hpp>
+#include <com/sun/star/xml/sax/FastParser.hpp>
+#include <com/sun/star/xml/sax/FastToken.hpp>
+
+using namespace css;
+using namespace css::beans;
+using namespace css::io;
+using namespace css::lang;
+using namespace css::uno;
+using namespace css::xml::sax;
+using namespace css::xml;
+
+namespace oox::crypto {
+
+namespace {
+
+std::u16string_view stripNamespacePrefix(std::u16string_view rsInputName)
+{
+    size_t idx = rsInputName.find(':');
+    if (idx == std::u16string_view::npos)
+        return rsInputName;
+    return rsInputName.substr(idx + 1);
+}
+
+class AgileTokenHandler : public sax_fastparser::FastTokenHandlerBase
+{
+public:
+    virtual sal_Int32 SAL_CALL getTokenFromUTF8(const Sequence< sal_Int8 >& /*nIdentifier*/) override
+    {
+        return FastToken::DONTKNOW;
+    }
+
+    virtual Sequence<sal_Int8> SAL_CALL getUTF8Identifier(sal_Int32 /*nToken*/) override
+    {
+        return Sequence<sal_Int8>();
+    }
+
+    virtual sal_Int32 getTokenDirect( const char * /* pToken */, sal_Int32 /* nLength */ ) const override
+    {
+        return -1;
+    }
+};
+
+class AgileDocumentHandler : public ::cppu::WeakImplHelper<XFastDocumentHandler>
+{
+    AgileEncryptionInfo& mInfo;
+
+public:
+    explicit AgileDocumentHandler(AgileEncryptionInfo& rInfo) :
+        mInfo(rInfo)
+    {}
+
+    void SAL_CALL startDocument() override {}
+    void SAL_CALL endDocument() override {}
+    void SAL_CALL processingInstruction( const OUString& /*rTarget*/, const OUString& /*rData*/ ) override {}
+    void SAL_CALL setDocumentLocator( const Reference< XLocator >& /*xLocator*/ ) override {}
+    void SAL_CALL startFastElement( sal_Int32 /*Element*/, const Reference< XFastAttributeList >& /*Attribs*/ ) override {}
+
+    void SAL_CALL startUnknownElement( const OUString& /*aNamespace*/, const OUString& rName, const Reference< XFastAttributeList >& aAttributeList ) override
+    {
+        std::u16string_view rLocalName = stripNamespacePrefix(rName);
+
+        const css::uno::Sequence<Attribute> aUnknownAttributes = aAttributeList->getUnknownAttributes();
+        for (const Attribute& rAttribute : aUnknownAttributes)
+        {
+            std::u16string_view rAttrLocalName = stripNamespacePrefix(rAttribute.Name);
+
+            if (rAttrLocalName == u"spinCount")
+            {
+                ::sax::Converter::convertNumber(mInfo.spinCount, rAttribute.Value);
+            }
+            else if (rAttrLocalName == u"saltSize")
+            {
+                ::sax::Converter::convertNumber(mInfo.saltSize, rAttribute.Value);
+            }
+            else if (rAttrLocalName == u"blockSize")
+            {
+                ::sax::Converter::convertNumber(mInfo.blockSize, rAttribute.Value);
+            }
+            else if (rAttrLocalName == u"keyBits")
+            {
+                ::sax::Converter::convertNumber(mInfo.keyBits, rAttribute.Value);
+            }
+            else if (rAttrLocalName == u"hashSize")
+            {
+                ::sax::Converter::convertNumber(mInfo.hashSize, rAttribute.Value);
+            }
+            else if (rAttrLocalName == u"cipherAlgorithm")
+            {
+                mInfo.cipherAlgorithm = rAttribute.Value;
+            }
+            else if (rAttrLocalName == u"cipherChaining")
+            {
+                mInfo.cipherChaining = rAttribute.Value;
+            }
+            else if (rAttrLocalName == u"hashAlgorithm")
+            {
+                mInfo.hashAlgorithm = rAttribute.Value;
+            }
+            else if (rAttrLocalName == u"saltValue")
+            {
+                Sequence<sal_Int8> saltValue;
+                comphelper::Base64::decode(saltValue, rAttribute.Value);
+                if (rLocalName == u"encryptedKey")
+                    mInfo.saltValue = comphelper::sequenceToContainer<std::vector<sal_uInt8>>(saltValue);
+                else if (rLocalName == u"keyData")
+                    mInfo.keyDataSalt = comphelper::sequenceToContainer<std::vector<sal_uInt8>>(saltValue);
+            }
+            else if (rAttrLocalName == u"encryptedVerifierHashInput")
+            {
+                Sequence<sal_Int8> encryptedVerifierHashInput;
+                comphelper::Base64::decode(encryptedVerifierHashInput, rAttribute.Value);
+                mInfo.encryptedVerifierHashInput = comphelper::sequenceToContainer<std::vector<sal_uInt8>>(encryptedVerifierHashInput);
+            }
+            else if (rAttrLocalName == u"encryptedVerifierHashValue")
+            {
+                Sequence<sal_Int8> encryptedVerifierHashValue;
+                comphelper::Base64::decode(encryptedVerifierHashValue, rAttribute.Value);
+                mInfo.encryptedVerifierHashValue = comphelper::sequenceToContainer<std::vector<sal_uInt8>>(encryptedVerifierHashValue);
+            }
+            else if (rAttrLocalName == u"encryptedKeyValue")
+            {
+                Sequence<sal_Int8> encryptedKeyValue;
+                comphelper::Base64::decode(encryptedKeyValue, rAttribute.Value);
+                mInfo.encryptedKeyValue = comphelper::sequenceToContainer<std::vector<sal_uInt8>>(encryptedKeyValue);
+            }
+            if (rAttrLocalName == u"encryptedHmacKey")
+            {
+                Sequence<sal_Int8> aValue;
+                comphelper::Base64::decode(aValue, rAttribute.Value);
+                mInfo.hmacEncryptedKey = comphelper::sequenceToContainer<std::vector<sal_uInt8>>(aValue);
+            }
+            if (rAttrLocalName == u"encryptedHmacValue")
+            {
+                Sequence<sal_Int8> aValue;
+                comphelper::Base64::decode(aValue, rAttribute.Value);
+                mInfo.hmacEncryptedValue = comphelper::sequenceToContainer<std::vector<sal_uInt8>>(aValue);
+            }
+        }
+    }
+
+    void SAL_CALL endFastElement( sal_Int32 /*aElement*/ ) override
+    {}
+    void SAL_CALL endUnknownElement( const OUString& /*aNamespace*/, const OUString& /*aName*/ ) override
+    {}
+
+    Reference< XFastContextHandler > SAL_CALL createFastChildContext( sal_Int32 /*aElement*/, const Reference< XFastAttributeList >& /*aAttribs*/ ) override
+    {
+        return nullptr;
+    }
+
+    Reference< XFastContextHandler > SAL_CALL createUnknownChildContext( const OUString& /*aNamespace*/, const OUString& /*aName*/, const Reference< XFastAttributeList >& /*aAttribs*/ ) override
+    {
+        return this;
+    }
+
+    void SAL_CALL characters( const OUString& /*aChars*/ ) override
+    {}
+};
+
+constexpr const sal_uInt32 constSegmentLength = 4096;
+
+const std::vector<sal_uInt8> constBlock1 { 0xfe, 0xa7, 0xd2, 0x76, 0x3b, 0x4b, 0x9e, 0x79 };
+const std::vector<sal_uInt8> constBlock2 { 0xd7, 0xaa, 0x0f, 0x6d, 0x30, 0x61, 0x34, 0x4e };
+const std::vector<sal_uInt8> constBlock3 { 0x14, 0x6e, 0x0b, 0xe7, 0xab, 0xac, 0xd0, 0xd6 };
+const std::vector<sal_uInt8> constBlockHmac1 { 0x5f, 0xb2, 0xad, 0x01, 0x0c, 0xb9, 0xe1, 0xf6 };
+const std::vector<sal_uInt8> constBlockHmac2 { 0xa0, 0x67, 0x7f, 0x02, 0xb2, 0x2c, 0x84, 0x33 };
+
+bool hashCalc(std::vector<sal_uInt8>& output,
+              std::vector<sal_uInt8>& input,
+              std::u16string_view sAlgorithm )
+{
+    if (sAlgorithm == u"SHA1")
+    {
+        std::vector<unsigned char> out = comphelper::Hash::calculateHash(input.data(), input.size(), comphelper::HashType::SHA1);
+        output = out;
+        return true;
+    }
+    else if (sAlgorithm == u"SHA512")
+    {
+        std::vector<unsigned char> out = comphelper::Hash::calculateHash(input.data(), input.size(), comphelper::HashType::SHA512);
+        output = out;
+        return true;
+    }
+    return false;
+}
+
+CryptoHashType cryptoHashTypeFromString(std::u16string_view sAlgorithm)
+{
+    if (sAlgorithm == u"SHA512")
+        return CryptoHashType::SHA512;
+    return CryptoHashType::SHA1;
+}
+
+} // namespace
+
+AgileEngine::AgileEngine()
+    : meEncryptionPreset(AgileEncryptionPreset::AES_256_SHA512)
+{}
+
+Crypto::CryptoType AgileEngine::cryptoType(const AgileEncryptionInfo& rInfo)
+{
+    if (rInfo.keyBits == 128 && rInfo.cipherAlgorithm == "AES" && rInfo.cipherChaining == "ChainingModeCBC")
+        return Crypto::AES_128_CBC;
+    else if (rInfo.keyBits == 256 && rInfo.cipherAlgorithm == "AES" && rInfo.cipherChaining == "ChainingModeCBC")
+        return Crypto::AES_256_CBC;
+    return Crypto::UNKNOWN;
+}
+
+static std::vector<sal_uInt8> calculateIV(comphelper::HashType eType,
+                             std::vector<sal_uInt8> const & rSalt,
+                             std::vector<sal_uInt8> const & rBlock,
+                             sal_Int32 nCipherBlockSize)
+{
+    comphelper::Hash aHasher(eType);
+    aHasher.update(rSalt.data(), rSalt.size());
+    aHasher.update(rBlock.data(), rBlock.size());
+    std::vector<sal_uInt8> aIV = aHasher.finalize();
+    aIV.resize(roundUp(sal_Int32(aIV.size()), nCipherBlockSize), 0x36);
+    return aIV;
+}
+
+void AgileEngine::calculateBlock(
+    std::vector<sal_uInt8> const & rBlock,
+    std::vector<sal_uInt8>& rHashFinal,
+    std::vector<sal_uInt8>& rInput,
+    std::vector<sal_uInt8>& rOutput)
+{
+    std::vector<sal_uInt8> hash(mInfo.hashSize, 0);
+    std::vector<sal_uInt8> dataFinal(mInfo.hashSize + rBlock.size(), 0);
+    std::copy(rHashFinal.begin(), rHashFinal.end(), dataFinal.begin());
+    std::copy(rBlock.begin(), rBlock.end(), dataFinal.begin() + mInfo.hashSize);
+
+    hashCalc(hash, dataFinal, mInfo.hashAlgorithm);
+
+    sal_Int32 keySize = mInfo.keyBits / 8;
+    std::vector<sal_uInt8> key(keySize, 0);
+
+    std::copy(hash.begin(), hash.begin() + keySize, key.begin());
+
+    Decrypt aDecryptor(key, mInfo.saltValue, cryptoType(mInfo));
+    aDecryptor.update(rOutput, rInput);
+}
+
+void AgileEngine::encryptBlock(
+    std::vector<sal_uInt8> const & rBlock,
+    std::vector<sal_uInt8> & rHashFinal,
+    std::vector<sal_uInt8> & rInput,
+    std::vector<sal_uInt8> & rOutput)
+{
+    std::vector<sal_uInt8> hash(mInfo.hashSize, 0);
+    std::vector<sal_uInt8> dataFinal(mInfo.hashSize + rBlock.size(), 0);
+    std::copy(rHashFinal.begin(), rHashFinal.end(), dataFinal.begin());
+    std::copy(rBlock.begin(), rBlock.end(), dataFinal.begin() + mInfo.hashSize);
+
+    hashCalc(hash, dataFinal, mInfo.hashAlgorithm);
+
+    sal_Int32 keySize = mInfo.keyBits / 8;
+    std::vector<sal_uInt8> key(keySize, 0);
+
+    std::copy(hash.begin(), hash.begin() + keySize, key.begin());
+
+    Encrypt aEncryptor(key, mInfo.saltValue, cryptoType(mInfo));
+
+    aEncryptor.update(rOutput, rInput);
+}
+
+void AgileEngine::calculateHashFinal(const OUString& rPassword, std::vector<sal_uInt8>& aHashFinal)
+{
+    aHashFinal = comphelper::DocPasswordHelper::GetOoxHashAsVector(
+                    rPassword, mInfo.saltValue, mInfo.spinCount,
+                    comphelper::Hash::IterCount::PREPEND, mInfo.hashAlgorithm);
+}
+
+namespace
+{
+
+bool generateBytes(std::vector<sal_uInt8> & rBytes, sal_Int32 nSize)
+{
+    size_t nMax = std::min(rBytes.size(), size_t(nSize));
+
+    for (size_t i = 0; i < nMax; ++i)
+    {
+        rBytes[i] = sal_uInt8(comphelper::rng::uniform_uint_distribution(0, 0xFF));
+    }
+
+    return true;
+}
+
+} // end anonymous namespace
+
+bool AgileEngine::decryptAndCheckVerifierHash(OUString const & rPassword)
+{
+    std::vector<sal_uInt8>& encryptedHashValue = mInfo.encryptedVerifierHashValue;
+    size_t encryptedHashValueSize = encryptedHashValue.size();
+    size_t nHashValueSize = mInfo.hashSize;
+    if (nHashValueSize > encryptedHashValueSize)
+        return false;
+
+    std::vector<sal_uInt8> hashFinal(nHashValueSize, 0);
+    calculateHashFinal(rPassword, hashFinal);
+
+    std::vector<sal_uInt8>& encryptedHashInput = mInfo.encryptedVerifierHashInput;
+    // SALT - needs to be a multiple of block size (?)
+    sal_uInt32 nSaltSize = roundUp(mInfo.saltSize, mInfo.blockSize);
+    if (nSaltSize < encryptedHashInput.size())
+        return false;
+    std::vector<sal_uInt8> hashInput(nSaltSize, 0);
+    calculateBlock(constBlock1, hashFinal, encryptedHashInput, hashInput);
+
+    std::vector<sal_uInt8> hashValue(encryptedHashValueSize, 0);
+    calculateBlock(constBlock2, hashFinal, encryptedHashValue, hashValue);
+
+    std::vector<sal_uInt8> hash(nHashValueSize, 0);
+    hashCalc(hash, hashInput, mInfo.hashAlgorithm);
+
+    return std::equal(hash.begin(), hash.end(), hashValue.begin());
+}
+
+void AgileEngine::decryptEncryptionKey(OUString const & rPassword)
+{
+    sal_Int32 nKeySize = mInfo.keyBits / 8;
+
+    mKey.clear();
+    mKey.resize(nKeySize, 0);
+
+    std::vector<sal_uInt8> aPasswordHash(mInfo.hashSize, 0);
+    calculateHashFinal(rPassword, aPasswordHash);
+
+    calculateBlock(constBlock3, aPasswordHash, mInfo.encryptedKeyValue, mKey);
+}
+
+// TODO: Rename
+bool AgileEngine::generateEncryptionKey(OUString const & rPassword)
+{
+    bool bResult = decryptAndCheckVerifierHash(rPassword);
+
+    if (bResult)
+    {
+        decryptEncryptionKey(rPassword);
+        decryptHmacKey();
+        decryptHmacValue();
+    }
+    return bResult;
+}
+
+bool AgileEngine::decryptHmacKey()
+{
+    // Initialize hmacKey
+    mInfo.hmacKey.clear();
+    mInfo.hmacKey.resize(mInfo.hmacEncryptedKey.size(), 0);
+
+    // Calculate IV
+    comphelper::HashType eType;
+    if (mInfo.hashAlgorithm == "SHA1")
+        eType = comphelper::HashType::SHA1;
+    else if (mInfo.hashAlgorithm == "SHA512")
+        eType = comphelper::HashType::SHA512;
+    else
+        return false;
+
+    std::vector<sal_uInt8> iv = calculateIV(eType, mInfo.keyDataSalt, constBlockHmac1, mInfo.blockSize);
+
+    // Decrypt without key, calculated iv
+    Decrypt aDecrypt(mKey, iv, cryptoType(mInfo));
+    aDecrypt.update(mInfo.hmacKey, mInfo.hmacEncryptedKey);
+
+    mInfo.hmacKey.resize(mInfo.hashSize, 0);
+
+    return true;
+}
+
+bool AgileEngine::decryptHmacValue()
+{
+    // Initialize hmacHash
+    mInfo.hmacHash.clear();
+    mInfo.hmacHash.resize(mInfo.hmacEncryptedValue.size(), 0);
+
+    // Calculate IV
+    comphelper::HashType eType;
+    if (mInfo.hashAlgorithm == "SHA1")
+        eType = comphelper::HashType::SHA1;
+    else if (mInfo.hashAlgorithm == "SHA512")
+        eType = comphelper::HashType::SHA512;
+    else
+        return false;
+    std::vector<sal_uInt8> iv = calculateIV(eType, mInfo.keyDataSalt, constBlockHmac2, mInfo.blockSize);
+
+    // Decrypt without key, calculated iv
+    Decrypt aDecrypt(mKey, iv, cryptoType(mInfo));
+    aDecrypt.update(mInfo.hmacHash, mInfo.hmacEncryptedValue);
+
+    mInfo.hmacHash.resize(mInfo.hashSize, 0);
+
+    return true;
+}
+
+bool AgileEngine::checkDataIntegrity()
+{
+    bool bResult = (mInfo.hmacHash.size() == mInfo.hmacCalculatedHash.size() &&
+               std::equal(mInfo.hmacHash.begin(), mInfo.hmacHash.end(), mInfo.hmacCalculatedHash.begin()));
+
+    return bResult;
+}
+
+bool AgileEngine::decrypt(BinaryXInputStream& aInputStream,
+                          BinaryXOutputStream& aOutputStream)
+{
+    CryptoHash aCryptoHash(mInfo.hmacKey, cryptoHashTypeFromString(mInfo.hashAlgorithm));
+
+    sal_uInt32 totalSize = aInputStream.readuInt32(); // Document unencrypted size - 4 bytes
+    // account for size in HMAC
+    std::vector<sal_uInt8> aSizeBytes(sizeof(sal_uInt32));
+    ByteOrderConverter::writeLittleEndian(aSizeBytes.data(), totalSize);
+    aCryptoHash.update(aSizeBytes);
+
+    aInputStream.skip(4);  // Reserved 4 Bytes
+    // account for reserved 4 bytes (must be 0)
+    std::vector<sal_uInt8> aReserved{0,0,0,0};
+    aCryptoHash.update(aReserved);
+
+    // setup decryption
+    std::vector<sal_uInt8>& keyDataSalt = mInfo.keyDataSalt;
+
+    sal_uInt32 saltSize = mInfo.saltSize;
+    sal_uInt32 keySize = mInfo.keyBits / 8;
+
+    sal_uInt32 segment = 0;
+
+    std::vector<sal_uInt8> saltWithBlockKey(saltSize + sizeof(segment), 0);
+    std::copy(keyDataSalt.begin(), keyDataSalt.end(), saltWithBlockKey.begin());
+
+    std::vector<sal_uInt8> hash(mInfo.hashSize, 0);
+    std::vector<sal_uInt8> iv(keySize, 0);
+
+    std::vector<sal_uInt8> inputBuffer(constSegmentLength);
+    std::vector<sal_uInt8> outputBuffer(constSegmentLength);
+    sal_uInt32 inputLength;
+    sal_uInt32 outputLength;
+    sal_uInt32 remaining = totalSize;
+
+    while ((inputLength = aInputStream.readMemory(inputBuffer.data(), inputBuffer.size())) > 0)
+    {
+        auto p = saltWithBlockKey.begin() + saltSize;
+        p[0] = segment & 0xFF;
+        p[1] = (segment >> 8) & 0xFF;
+        p[2] = (segment >> 16) & 0xFF;
+        p[3] = segment >> 24;
+
+        hashCalc(hash, saltWithBlockKey, mInfo.hashAlgorithm);
+
+        // Only if hash > keySize
+        std::copy(hash.begin(), hash.begin() + keySize, iv.begin());
+
+        Decrypt aDecryptor(mKey, iv, AgileEngine::cryptoType(mInfo));
+        outputLength = aDecryptor.update(outputBuffer, inputBuffer, inputLength);
+
+        sal_uInt32 writeLength = std::min(outputLength, remaining);
+
+        aCryptoHash.update(inputBuffer, inputLength);
+
+        aOutputStream.writeMemory(outputBuffer.data(), writeLength);
+
+        remaining -= outputLength;
+        segment++;
+    }
+
+    mInfo.hmacCalculatedHash = aCryptoHash.finalize();
+
+    return true;
+}
+
+bool AgileEngine::readEncryptionInfo(uno::Reference<io::XInputStream> & rxInputStream)
+{
+    // Check reserved value
+    std::vector<sal_uInt8> aExpectedReservedBytes(sizeof(sal_uInt32));
+    ByteOrderConverter::writeLittleEndian(aExpectedReservedBytes.data(), msfilter::AGILE_ENCRYPTION_RESERVED);
+
+    uno::Sequence<sal_Int8> aReadReservedBytes(sizeof(sal_uInt32));
+    rxInputStream->readBytes(aReadReservedBytes, aReadReservedBytes.getLength());
+
+    if (!std::equal(std::cbegin(aReadReservedBytes), std::cend(aReadReservedBytes), aExpectedReservedBytes.begin()))
+        return false;
+
+    mInfo.spinCount = 0;
+    mInfo.saltSize = 0;
+    mInfo.keyBits = 0;
+    mInfo.hashSize = 0;
+    mInfo.blockSize = 0;
+
+    Reference<XFastDocumentHandler> xFastDocumentHandler(new AgileDocumentHandler(mInfo));
+    Reference<XFastTokenHandler> xFastTokenHandler(new AgileTokenHandler);
+
+    Reference<XFastParser> xParser(css::xml::sax::FastParser::create(comphelper::getProcessComponentContext()));
+
+    xParser->setFastDocumentHandler(xFastDocumentHandler);
+    xParser->setTokenHandler(xFastTokenHandler);
+
+    InputSource aInputSource;
+    aInputSource.aInputStream = rxInputStream;
+    xParser->parseStream(aInputSource);
+
+    // CHECK info data
+    if (2 > mInfo.blockSize || mInfo.blockSize > 4096)
+        return false;
+
+    if (0 > mInfo.spinCount || mInfo.spinCount > 10000000)
+        return false;
+
+    if (1 > mInfo.saltSize|| mInfo.saltSize > 65536) // Check
+        return false;
+
+    // AES 128 CBC with SHA1
+    if (mInfo.keyBits         == 128 &&
+        mInfo.cipherAlgorithm == "AES" &&
+        mInfo.cipherChaining  == "ChainingModeCBC" &&
+        mInfo.hashAlgorithm   == "SHA1" &&
+        mInfo.hashSize        == comphelper::SHA1_HASH_LENGTH)
+    {
+        return true;
+    }
+
+    // AES 256 CBC with SHA512
+    if (mInfo.keyBits         == 256 &&
+        mInfo.cipherAlgorithm == "AES" &&
+        mInfo.cipherChaining  == "ChainingModeCBC" &&
+        mInfo.hashAlgorithm   == "SHA512" &&
+        mInfo.hashSize        == comphelper::SHA512_HASH_LENGTH)
+    {
+        return true;
+    }
+
+    return false;
+}
+
+bool AgileEngine::generateAndEncryptVerifierHash(OUString const & rPassword)
+{
+    if (!generateBytes(mInfo.saltValue, mInfo.saltSize))
+        return false;
+
+    std::vector<sal_uInt8> unencryptedVerifierHashInput(mInfo.saltSize);
+    if (!generateBytes(unencryptedVerifierHashInput, mInfo.saltSize))
+        return false;
+
+    // HASH - needs to be modified to be multiple of block size
+    sal_Int32 nVerifierHash = roundUp(mInfo.hashSize, mInfo.blockSize);
+    std::vector<sal_uInt8> unencryptedVerifierHashValue;
+    if (!hashCalc(unencryptedVerifierHashValue, unencryptedVerifierHashInput, mInfo.hashAlgorithm))
+        return false;
+    unencryptedVerifierHashValue.resize(nVerifierHash, 0);
+
+    std::vector<sal_uInt8> hashFinal(mInfo.hashSize, 0);
+    calculateHashFinal(rPassword, hashFinal);
+
+    encryptBlock(constBlock1, hashFinal, unencryptedVerifierHashInput, mInfo.encryptedVerifierHashInput);
+
+    encryptBlock(constBlock2, hashFinal, unencryptedVerifierHashValue, mInfo.encryptedVerifierHashValue);
+
+    return true;
+}
+
+bool AgileEngine::encryptHmacKey()
+{
+    // Initialize hmacKey
+    mInfo.hmacKey.clear();
+    mInfo.hmacKey.resize(mInfo.hashSize, 0);
+
+    if (!generateBytes(mInfo.hmacKey, mInfo.hashSize))
+        return false;
+
+    // Encrypted salt must be multiple of block size
+    sal_Int32 nEncryptedSaltSize = oox::crypto::roundUp(mInfo.hashSize, mInfo.blockSize);
+
+    // We need to extend hmacSalt to multiple of block size, padding with 0x36
+    std::vector<sal_uInt8> extendedSalt(mInfo.hmacKey);
+    extendedSalt.resize(nEncryptedSaltSize, 0x36);
+
+    // Initialize hmacEncryptedKey
+    mInfo.hmacEncryptedKey.clear();
+    mInfo.hmacEncryptedKey.resize(nEncryptedSaltSize, 0);
+
+    // Calculate IV
+    comphelper::HashType eType;
+    if (mInfo.hashAlgorithm == "SHA1")
+        eType = comphelper::HashType::SHA1;
+    else if (mInfo.hashAlgorithm == "SHA512")
+        eType = comphelper::HashType::SHA512;
+    else
+        return false;
+
+    std::vector<sal_uInt8> iv = calculateIV(eType, mInfo.keyDataSalt, constBlockHmac1, mInfo.blockSize);
+
+    // Encrypt without key, calculated iv
+    Encrypt aEncryptor(mKey, iv, cryptoType(mInfo));
+    aEncryptor.update(mInfo.hmacEncryptedKey, extendedSalt);
+
+    return true;
+}
+
+bool AgileEngine::encryptHmacValue()
+{
+    sal_Int32 nEncryptedValueSize = roundUp(mInfo.hashSize, mInfo.blockSize);
+    mInfo.hmacEncryptedValue.clear();
+    mInfo.hmacEncryptedValue.resize(nEncryptedValueSize, 0);
+
+    std::vector<sal_uInt8> extendedHash(mInfo.hmacHash);
+    extendedHash.resize(nEncryptedValueSize, 0x36);
+
+    // Calculate IV
+    comphelper::HashType eType;
+    if (mInfo.hashAlgorithm == "SHA1")
+        eType = comphelper::HashType::SHA1;
+    else if (mInfo.hashAlgorithm == "SHA512")
+        eType = comphelper::HashType::SHA512;
+    else
+        return false;
+
+    std::vector<sal_uInt8> iv = calculateIV(eType, mInfo.keyDataSalt, constBlockHmac2, mInfo.blockSize);
+
+    // Encrypt without key, calculated iv
+    Encrypt aEncryptor(mKey, iv, cryptoType(mInfo));
+    aEncryptor.update(mInfo.hmacEncryptedValue, extendedHash);
+
+    return true;
+}
+
+bool AgileEngine::encryptEncryptionKey(OUString const & rPassword)
+{
+    sal_Int32 nKeySize = mInfo.keyBits / 8;
+
+    mKey.clear();
+    mKey.resize(nKeySize, 0);
+
+    mInfo.encryptedKeyValue.clear();
+    mInfo.encryptedKeyValue.resize(nKeySize, 0);
+
+    if (!generateBytes(mKey, nKeySize))
+        return false;
+
+    std::vector<sal_uInt8> aPasswordHash(mInfo.hashSize, 0);
+    calculateHashFinal(rPassword, aPasswordHash);
+
+    encryptBlock(constBlock3, aPasswordHash, mKey, mInfo.encryptedKeyValue);
+
+    return true;
+}
+
+bool AgileEngine::setupEncryption(OUString const & rPassword)
+{
+    if (meEncryptionPreset == AgileEncryptionPreset::AES_128_SHA1)
+        setupEncryptionParameters({ 100000, 16, 128, 20, 16, OUString("AES"), OUString("ChainingModeCBC"), OUString("SHA1") });
+    else
+        setupEncryptionParameters({ 100000, 16, 256, 64, 16, OUString("AES"), OUString("ChainingModeCBC"), OUString("SHA512") });
+
+    return setupEncryptionKey(rPassword);
+}
+
+void AgileEngine::setupEncryptionParameters(AgileEncryptionParameters const & rAgileEncryptionParameters)
+{
+    mInfo.spinCount = rAgileEncryptionParameters.spinCount;
+    mInfo.saltSize = rAgileEncryptionParameters.saltSize;
+    mInfo.keyBits = rAgileEncryptionParameters.keyBits;
+    mInfo.hashSize = rAgileEncryptionParameters.hashSize;
+    mInfo.blockSize = rAgileEncryptionParameters.blockSize;
+
+    mInfo.cipherAlgorithm = rAgileEncryptionParameters.cipherAlgorithm;
+    mInfo.cipherChaining = rAgileEncryptionParameters.cipherChaining;
+    mInfo.hashAlgorithm = rAgileEncryptionParameters.hashAlgorithm;
+
+    mInfo.keyDataSalt.resize(mInfo.saltSize);
+    mInfo.saltValue.resize(mInfo.saltSize);
+    mInfo.encryptedVerifierHashInput.resize(mInfo.saltSize);
+    mInfo.encryptedVerifierHashValue.resize(roundUp(mInfo.hashSize, mInfo.blockSize), 0);
+}
+
+bool AgileEngine::setupEncryptionKey(OUString const & rPassword)
+{
+    if (!generateAndEncryptVerifierHash(rPassword))
+        return false;
+    if (!encryptEncryptionKey(rPassword))
+        return false;
+    if (!generateBytes(mInfo.keyDataSalt, mInfo.saltSize))
+        return false;
+    if (!encryptHmacKey())
+        return false;
+    return true;
+}
+
+void AgileEngine::writeEncryptionInfo(BinaryXOutputStream & rStream)
+{
+    rStream.WriteUInt32(msfilter::VERSION_INFO_AGILE);
+    rStream.WriteUInt32(msfilter::AGILE_ENCRYPTION_RESERVED);
+
+    SvMemoryStream aMemStream;
+    tools::XmlWriter aXmlWriter(&aMemStream);
+
+    if (aXmlWriter.startDocument(0/*nIndent*/))
+    {
+        aXmlWriter.startElement("", "encryption", "http://schemas.microsoft.com/office/2006/encryption");
+        aXmlWriter.attribute("xmlns:p", OString("http://schemas.microsoft.com/office/2006/keyEncryptor/password"));
+
+        aXmlWriter.startElement("keyData");
+        aXmlWriter.attribute("saltSize", mInfo.saltSize);
+        aXmlWriter.attribute("blockSize", mInfo.blockSize);
+        aXmlWriter.attribute("keyBits", mInfo.keyBits);
+        aXmlWriter.attribute("hashSize", mInfo.hashSize);
+        aXmlWriter.attribute("cipherAlgorithm", mInfo.cipherAlgorithm);
+        aXmlWriter.attribute("cipherChaining", mInfo.cipherChaining);
+        aXmlWriter.attribute("hashAlgorithm", mInfo.hashAlgorithm);
+        aXmlWriter.attributeBase64("saltValue", mInfo.keyDataSalt);
+        aXmlWriter.endElement();
+
+        aXmlWriter.startElement("dataIntegrity");
+        aXmlWriter.attributeBase64("encryptedHmacKey", mInfo.hmacEncryptedKey);
+        aXmlWriter.attributeBase64("encryptedHmacValue", mInfo.hmacEncryptedValue);
+        aXmlWriter.endElement();
+
+        aXmlWriter.startElement("keyEncryptors");
+        aXmlWriter.startElement("keyEncryptor");
+        aXmlWriter.attribute("uri", OString("http://schemas.microsoft.com/office/2006/keyEncryptor/password"));
+
+        aXmlWriter.startElement("p", "encryptedKey", "");
+        aXmlWriter.attribute("spinCount", mInfo.spinCount);
+        aXmlWriter.attribute("saltSize", mInfo.saltSize);
+        aXmlWriter.attribute("blockSize", mInfo.blockSize);
+        aXmlWriter.attribute("keyBits", mInfo.keyBits);
+        aXmlWriter.attribute("hashSize", mInfo.hashSize);
+        aXmlWriter.attribute("cipherAlgorithm", mInfo.cipherAlgorithm);
+        aXmlWriter.attribute("cipherChaining", mInfo.cipherChaining);
+        aXmlWriter.attribute("hashAlgorithm", mInfo.hashAlgorithm);
+        aXmlWriter.attributeBase64("saltValue", mInfo.saltValue);
+        aXmlWriter.attributeBase64("encryptedVerifierHashInput", mInfo.encryptedVerifierHashInput);
+        aXmlWriter.attributeBase64("encryptedVerifierHashValue", mInfo.encryptedVerifierHashValue);
+        aXmlWriter.attributeBase64("encryptedKeyValue", mInfo.encryptedKeyValue);
+        aXmlWriter.endElement();
+
+        aXmlWriter.endElement();
+        aXmlWriter.endElement();
+
+        aXmlWriter.endElement();
+        aXmlWriter.endDocument();
+    }
+    rStream.writeMemory(aMemStream.GetData(), aMemStream.GetSize());
+}
+
+void AgileEngine::encrypt(const css::uno::Reference<css::io::XInputStream> &  rxInputStream,
+                          css::uno::Reference<css::io::XOutputStream> & rxOutputStream,
+                          sal_uInt32 nSize)
+{
+    CryptoHash aCryptoHash(mInfo.hmacKey, cryptoHashTypeFromString(mInfo.hashAlgorithm));
+
+    BinaryXOutputStream aBinaryOutputStream(rxOutputStream, false);
+    BinaryXInputStream aBinaryInputStream(rxInputStream, false);
+
+    std::vector<sal_uInt8> aSizeBytes(sizeof(sal_uInt32));
+    ByteOrderConverter::writeLittleEndian(aSizeBytes.data(), nSize);
+    aBinaryOutputStream.writeMemory(aSizeBytes.data(), aSizeBytes.size()); // size
+    aCryptoHash.update(aSizeBytes, aSizeBytes.size());
+
+    std::vector<sal_uInt8> aNull{0,0,0,0};
+    aBinaryOutputStream.writeMemory(aNull.data(), aNull.size()); // reserved
+    aCryptoHash.update(aNull, aNull.size());
+
+    std::vector<sal_uInt8>& keyDataSalt = mInfo.keyDataSalt;
+
+    sal_uInt32 saltSize = mInfo.saltSize;
+    sal_uInt32 keySize = mInfo.keyBits / 8;
+
+    sal_uInt32 nSegment = 0;
+    sal_uInt32 nSegmentByteSize = sizeof(nSegment);
+
+    std::vector<sal_uInt8> saltWithBlockKey(saltSize + nSegmentByteSize, 0);
+    std::copy(keyDataSalt.begin(), keyDataSalt.end(), saltWithBlockKey.begin());
+
+    std::vector<sal_uInt8> hash(mInfo.hashSize, 0);
+    std::vector<sal_uInt8> iv(keySize, 0);
+
+    std::vector<sal_uInt8> inputBuffer(constSegmentLength);
+    std::vector<sal_uInt8> outputBuffer(constSegmentLength);
+    sal_uInt32 inputLength;
+    sal_uInt32 outputLength;
+
+    while ((inputLength = aBinaryInputStream.readMemory(inputBuffer.data(), inputBuffer.size())) > 0)
+    {
+        sal_uInt32 correctedInputLength = inputLength % mInfo.blockSize == 0 ?
+                        inputLength : oox::crypto::roundUp(inputLength, sal_uInt32(mInfo.blockSize));
+
+        // Update Key
+        auto p = saltWithBlockKey.begin() + saltSize;
+        p[0] = nSegment & 0xFF;
+        p[1] = (nSegment >> 8) & 0xFF;
+        p[2] = (nSegment >> 16) & 0xFF;
+        p[3] = nSegment >> 24;
+
+        hashCalc(hash, saltWithBlockKey, mInfo.hashAlgorithm);
+
+        // Only if hash > keySize
+        std::copy(hash.begin(), hash.begin() + keySize, iv.begin());
+
+        Encrypt aEncryptor(mKey, iv, AgileEngine::cryptoType(mInfo));
+        outputLength = aEncryptor.update(outputBuffer, inputBuffer, correctedInputLength);
+        aBinaryOutputStream.writeMemory(outputBuffer.data(), outputLength);
+        aCryptoHash.update(outputBuffer, outputLength);
+
+        nSegment++;
+    }
+    mInfo.hmacHash = aCryptoHash.finalize();
+    encryptHmacValue();
+}
+
+} // namespace oox::crypto
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */