1 files changed, 265 insertions, 0 deletions
diff --git a/xmlsecurity/source/xmlsec/nss/ciphercontext.cxx b/xmlsecurity/source/xmlsec/nss/ciphercontext.cxx
new file mode 100644
index 000000000..ff3441249
--- /dev/null
+++ b/xmlsecurity/source/xmlsec/nss/ciphercontext.cxx
@@ -0,0 +1,265 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+
+#include <com/sun/star/lang/DisposedException.hpp>
+#include <osl/diagnose.h>
+#include <rtl/random.h>
+#include <rtl/ref.hxx>
+
+#include "ciphercontext.hxx"
+#include <pk11pub.h>
+
+using namespace ::com::sun::star;
+
+uno::Reference< xml::crypto::XCipherContext > OCipherContext::Create( CK_MECHANISM_TYPE nNSSCipherID, const uno::Sequence< ::sal_Int8 >& aKey, const uno::Sequence< ::sal_Int8 >& aInitializationVector, bool bEncryption, bool bW3CPadding )
+{
+    ::rtl::Reference< OCipherContext > xResult = new OCipherContext;
+
+    xResult->m_pSlot = PK11_GetBestSlot( nNSSCipherID, nullptr );
+    if ( xResult->m_pSlot )
+    {
+        SECItem aKeyItem = { siBuffer, const_cast< unsigned char* >( reinterpret_cast< const unsigned char* >( aKey.getConstArray() ) ), sal::static_int_cast<unsigned>( aKey.getLength() ) };
+        xResult->m_pSymKey = PK11_ImportSymKey( xResult->m_pSlot, nNSSCipherID, PK11_OriginDerive, bEncryption ? CKA_ENCRYPT : CKA_DECRYPT, &aKeyItem, nullptr );
+        if ( xResult->m_pSymKey )
+        {
+            SECItem aIVItem = { siBuffer, const_cast< unsigned char* >( reinterpret_cast< const unsigned char* >( aInitializationVector.getConstArray() ) ), sal::static_int_cast<unsigned>( aInitializationVector.getLength() ) };
+            xResult->m_pSecParam = PK11_ParamFromIV( nNSSCipherID, &aIVItem );
+            if ( xResult->m_pSecParam )
+            {
+                xResult->m_pContext = PK11_CreateContextBySymKey( nNSSCipherID, bEncryption ? CKA_ENCRYPT : CKA_DECRYPT, xResult->m_pSymKey, xResult->m_pSecParam);
+                if ( xResult->m_pContext )
+                {
+                    xResult->m_bEncryption = bEncryption;
+                    xResult->m_bW3CPadding = bW3CPadding;
+                    xResult->m_bPadding = bW3CPadding || ( PK11_GetPadMechanism( nNSSCipherID ) == nNSSCipherID );
+                    xResult->m_nBlockSize = PK11_GetBlockSize( nNSSCipherID, xResult->m_pSecParam );
+                    if ( xResult->m_nBlockSize <= SAL_MAX_INT8 )
+                        return xResult;
+                }
+            }
+        }
+    }
+
+    return uno::Reference< xml::crypto::XCipherContext >();
+}
+
+void OCipherContext::Dispose()
+{
+    if ( m_pContext )
+    {
+        PK11_DestroyContext( m_pContext, PR_TRUE );
+        m_pContext = nullptr;
+    }
+
+    if ( m_pSecParam )
+    {
+        SECITEM_FreeItem( m_pSecParam, PR_TRUE );
+        m_pSecParam = nullptr;
+    }
+
+    if ( m_pSymKey )
+    {
+        PK11_FreeSymKey( m_pSymKey );
+        m_pSymKey = nullptr;
+    }
+
+    if ( m_pSlot )
+    {
+        PK11_FreeSlot( m_pSlot );
+        m_pSlot = nullptr;
+    }
+
+    m_bDisposed = true;
+}
+
+uno::Sequence< ::sal_Int8 > SAL_CALL OCipherContext::convertWithCipherContext( const uno::Sequence< ::sal_Int8 >& aData )
+{
+    std::unique_lock aGuard( m_aMutex );
+
+    if ( m_bBroken )
+        throw uno::RuntimeException();
+
+    if ( m_bDisposed )
+        throw lang::DisposedException();
+
+    uno::Sequence< sal_Int8 > aToConvert;
+    if ( aData.hasElements() )
+    {
+        sal_Int32 nOldLastBlockLen = m_aLastBlock.getLength();
+        OSL_ENSURE( nOldLastBlockLen <= m_nBlockSize, "Unexpected last block size!" );
+
+        sal_Int32 nAvailableData = nOldLastBlockLen + aData.getLength();
+        sal_Int32 nToConvertLen;
+        if ( m_bEncryption || !m_bW3CPadding )
+        {
+            if ( nAvailableData % m_nBlockSize == 0 )
+                nToConvertLen = nAvailableData;
+            else if ( nAvailableData < m_nBlockSize )
+                nToConvertLen = 0;
+            else
+                nToConvertLen = nAvailableData - nAvailableData % m_nBlockSize;
+        }
+        else
+        {
+            // decryption with W3C padding needs at least one block for finalizing
+            if ( nAvailableData < m_nBlockSize * 2 )
+                nToConvertLen = 0;
+            else
+                nToConvertLen = nAvailableData - nAvailableData % m_nBlockSize - m_nBlockSize;
+        }
+
+        aToConvert.realloc( nToConvertLen );
+        if ( nToConvertLen == 0 )
+        {
+            m_aLastBlock.realloc( nOldLastBlockLen + aData.getLength() );
+            memcpy( m_aLastBlock.getArray() + nOldLastBlockLen, aData.getConstArray(), aData.getLength() );
+            // aToConvert stays empty
+        }
+        else if ( nToConvertLen < nOldLastBlockLen )
+        {
+            memcpy( aToConvert.getArray(), m_aLastBlock.getConstArray(), nToConvertLen );
+            memcpy( m_aLastBlock.getArray(), m_aLastBlock.getConstArray() + nToConvertLen, nOldLastBlockLen - nToConvertLen );
+            m_aLastBlock.realloc( nOldLastBlockLen - nToConvertLen + aData.getLength() );
+            memcpy( m_aLastBlock.getArray() + nOldLastBlockLen - nToConvertLen, aData.getConstArray(), aData.getLength() );
+        }
+        else
+        {
+            memcpy( aToConvert.getArray(), m_aLastBlock.getConstArray(), nOldLastBlockLen );
+            if ( nToConvertLen > nOldLastBlockLen )
+                memcpy( aToConvert.getArray() + nOldLastBlockLen, aData.getConstArray(), nToConvertLen - nOldLastBlockLen );
+            m_aLastBlock.realloc( nAvailableData - nToConvertLen );
+            memcpy( m_aLastBlock.getArray(), aData.getConstArray() + nToConvertLen - nOldLastBlockLen, nAvailableData - nToConvertLen );
+        }
+    }
+
+    uno::Sequence< sal_Int8 > aResult;
+    OSL_ENSURE( aToConvert.getLength() % m_nBlockSize == 0, "Unexpected size of the data to encrypt!" );
+    if ( aToConvert.hasElements() )
+    {
+        int nResultLen = 0;
+        aResult.realloc( aToConvert.getLength() + m_nBlockSize );
+        if ( PK11_CipherOp( m_pContext, reinterpret_cast< unsigned char* >( aResult.getArray() ), &nResultLen, aResult.getLength(), reinterpret_cast< const unsigned char* >( aToConvert.getConstArray() ), aToConvert.getLength() ) != SECSuccess )
+        {
+            m_bBroken = true;
+            Dispose();
+            throw uno::RuntimeException();
+        }
+
+        m_nConverted += aToConvert.getLength();
+        aResult.realloc( nResultLen );
+    }
+
+    return aResult;
+}
+
+uno::Sequence< ::sal_Int8 > SAL_CALL OCipherContext::finalizeCipherContextAndDispose()
+{
+    std::unique_lock aGuard( m_aMutex );
+
+    if ( m_bBroken )
+        throw uno::RuntimeException();
+
+    if ( m_bDisposed )
+        throw lang::DisposedException();
+
+    OSL_ENSURE( m_nBlockSize <= SAL_MAX_INT8, "Unexpected block size!" );
+    OSL_ENSURE( m_nConverted % m_nBlockSize == 0, "Unexpected amount of bytes is already converted!" );
+    sal_Int32 nSizeForPadding = ( m_nConverted + m_aLastBlock.getLength() ) % m_nBlockSize;
+
+    // if it is decryption, the amount of data should be rounded to the block size even in case of padding
+    if ( ( !m_bPadding || !m_bEncryption ) && nSizeForPadding )
+        throw uno::RuntimeException("The data should contain complete blocks only." );
+
+    if ( m_bW3CPadding && m_bEncryption )
+    {
+        // in this case the last block should be smaller than standard block
+        // it will be increased with the padding
+        OSL_ENSURE( m_aLastBlock.getLength() < m_nBlockSize, "Unexpected size of cashed incomplete last block!" );
+
+        // W3CPadding handling for encryption
+        sal_Int32 nPaddingSize = m_nBlockSize - nSizeForPadding;
+        sal_Int32 nOldLastBlockLen = m_aLastBlock.getLength();
+        m_aLastBlock.realloc( nOldLastBlockLen + nPaddingSize );
+        auto pLastBlock = m_aLastBlock.getArray();
+
+        if ( nPaddingSize > 1 )
+        {
+            rtlRandomPool aRandomPool = rtl_random_createPool();
+            rtl_random_getBytes( aRandomPool, pLastBlock + nOldLastBlockLen, nPaddingSize - 1 );
+            rtl_random_destroyPool ( aRandomPool );
+        }
+        pLastBlock[m_aLastBlock.getLength() - 1] = static_cast< sal_Int8 >( nPaddingSize );
+    }
+
+    // finally should the last block be smaller than two standard blocks
+    OSL_ENSURE( m_aLastBlock.getLength() < m_nBlockSize * 2 , "Unexpected size of cashed incomplete last block!" );
+
+    uno::Sequence< sal_Int8 > aResult;
+    if ( m_aLastBlock.hasElements() )
+    {
+        int nPrefResLen = 0;
+        aResult.realloc( m_aLastBlock.getLength() + m_nBlockSize );
+        if ( PK11_CipherOp( m_pContext, reinterpret_cast< unsigned char* >( aResult.getArray() ), &nPrefResLen, aResult.getLength(), reinterpret_cast< const unsigned char* >( m_aLastBlock.getConstArray() ), m_aLastBlock.getLength() ) != SECSuccess )
+        {
+            m_bBroken = true;
+            Dispose();
+            throw uno::RuntimeException();
+        }
+
+        aResult.realloc( nPrefResLen );
+        m_aLastBlock.realloc( 0 );
+    }
+
+    sal_Int32 nPrefixLen = aResult.getLength();
+    aResult.realloc( nPrefixLen + m_nBlockSize * 2 );
+    unsigned nFinalLen = 0;
+    if ( PK11_DigestFinal( m_pContext, reinterpret_cast< unsigned char* >( aResult.getArray() + nPrefixLen ), &nFinalLen, aResult.getLength() - nPrefixLen ) != SECSuccess )
+    {
+        m_bBroken = true;
+        Dispose();
+        throw uno::RuntimeException();
+    }
+
+    aResult.realloc( nPrefixLen + nFinalLen );
+
+    if ( m_bW3CPadding && !m_bEncryption )
+    {
+        // W3CPadding handling for decryption
+        // aResult should have enough data, since we let m_aLastBlock be big enough in case of decryption
+        OSL_ENSURE( aResult.getLength() >= m_nBlockSize, "Not enough data to handle the padding!" );
+
+        sal_Int8 nBytesToRemove = aResult[aResult.getLength() - 1];
+        if ( nBytesToRemove <= 0 || nBytesToRemove > aResult.getLength() )
+        {
+            m_bBroken = true;
+            Dispose();
+            throw uno::RuntimeException();
+        }
+
+        aResult.realloc( aResult.getLength() - nBytesToRemove );
+    }
+
+    Dispose();
+
+    return aResult;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */