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Diffstat (limited to '')
| -rw-r--r-- | oox/source/crypto/AgileEngine.cxx | 843 |
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: */ |