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diff -up qpdf-9.0.1/libqpdf/QPDF.cc.relax qpdf-9.0.1/libqpdf/QPDF.cc
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--- qpdf-9.0.1/libqpdf/QPDF.cc.relax	2019-09-20 14:07:56.000000000 +0200
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+++ qpdf-9.0.1/libqpdf/QPDF.cc	2019-10-01 13:15:46.513551565 +0200
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@@ -10,6 +10,10 @@
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 #include <string.h>
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 #include <memory.h>
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+#ifdef HAVE_GNUTLS
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+# include <gnutls/crypto.h>
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+#endif
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+
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 #include <qpdf/QTC.hh>
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 #include <qpdf/QUtil.hh>
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 #include <qpdf/Pipeline.hh>
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@@ -207,7 +211,13 @@ QPDF::processFile(char const* filename,
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 {
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     FileInputSource* fi = new FileInputSource();
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     fi->setFilename(filename);
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+#ifdef HAVE_GNUTLS
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+    GNUTLS_FIPS140_SET_LAX_MODE();
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+#endif
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     processInputSource(fi, password);
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+#ifdef HAVE_GNUTLS
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+    GNUTLS_FIPS140_SET_STRICT_MODE();
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+#endif
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 }
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 void
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@@ -216,7 +226,13 @@ QPDF::processFile(char const* descriptio
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 {
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     FileInputSource* fi = new FileInputSource();
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     fi->setFile(description, filep, close_file);
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+#ifdef HAVE_GNUTLS
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+    GNUTLS_FIPS140_SET_LAX_MODE();
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+#endif
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     processInputSource(fi, password);
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+#ifdef HAVE_GNUTLS
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+    GNUTLS_FIPS140_SET_STRICT_MODE();
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+#endif
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 }
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 void
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diff -up qpdf-9.0.1/libqpdf/QPDF_encryption.cc.relax qpdf-9.0.1/libqpdf/QPDF_encryption.cc
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--- qpdf-9.0.1/libqpdf/QPDF_encryption.cc.relax	2019-09-20 14:07:56.000000000 +0200
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+++ qpdf-9.0.1/libqpdf/QPDF_encryption.cc	2019-10-01 13:19:56.086467631 +0200
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@@ -1,6 +1,8 @@
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 // This file implements methods from the QPDF class that involve
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 // encryption.
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+#include <qpdf/qpdf-config.h>
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+
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 #include <qpdf/QPDF.hh>
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 #include <qpdf/QPDFExc.hh>
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@@ -18,6 +20,10 @@
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 #include <assert.h>
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 #include <string.h>
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+#ifdef HAVE_GNUTLS
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+# include <gnutls/crypto.h>
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+#endif
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+
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 static unsigned char const padding_string[] = {
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     0x28, 0xbf, 0x4e, 0x5e, 0x4e, 0x75, 0x8a, 0x41,
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     0x64, 0x00, 0x4e, 0x56, 0xff, 0xfa, 0x01, 0x08,
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@@ -1140,6 +1146,12 @@ QPDF::getKeyForObject(
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 void
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 QPDF::decryptString(std::string& str, int objid, int generation)
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 {
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+#ifdef HAVE_GNUTLS
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+    unsigned oldmode = gnutls_fips140_mode_enabled();
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+
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+    gnutls_fips140_set_mode(GNUTLS_FIPS140_LAX, GNUTLS_FIPS140_SET_MODE_THREAD);
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+#endif
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+
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     if (objid == 0)
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     {
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 	return;
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@@ -1220,6 +1232,10 @@ QPDF::decryptString(std::string& str, in
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 		      QUtil::int_to_string(objid) + " " +
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 		      QUtil::int_to_string(generation) + ": " + e.what());
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     }
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+
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+#ifdef HAVE_GNUTLS
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+    gnutls_fips140_set_mode(static_cast<gnutls_fips_mode_t>(oldmode), GNUTLS_FIPS140_SET_MODE_THREAD);
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+#endif
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 }
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 void
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@@ -1231,6 +1247,12 @@ QPDF::decryptStream(PointerHolder
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                     bool is_attachment_stream,
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 		    std::vector<PointerHolder<Pipeline> >& heap)
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 {
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+#ifdef HAVE_GNUTLS
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+    unsigned oldmode = gnutls_fips140_mode_enabled();
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+
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+    gnutls_fips140_set_mode(GNUTLS_FIPS140_LAX, GNUTLS_FIPS140_SET_MODE_THREAD);
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+#endif
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+
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     std::string type;
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     if (stream_dict.getKey("/Type").isName())
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     {
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@@ -1360,6 +1382,10 @@ QPDF::decryptStream(PointerHolder
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                               toI(key.length()));
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     }
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     heap.push_back(pipeline);
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+
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+#ifdef HAVE_GNUTLS
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+    gnutls_fips140_set_mode(static_cast<gnutls_fips_mode_t>(oldmode), GNUTLS_FIPS140_SET_MODE_THREAD);
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+#endif
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 }
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 void
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diff -up qpdf-9.0.1/libqpdf/QPDFWriter.cc.relax qpdf-9.0.1/libqpdf/QPDFWriter.cc
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--- qpdf-9.0.1/libqpdf/QPDFWriter.cc.relax	2019-09-20 14:07:56.000000000 +0200
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+++ qpdf-9.0.1/libqpdf/QPDFWriter.cc	2019-10-01 13:16:49.665013937 +0200
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@@ -24,6 +24,10 @@
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 #include <algorithm>
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 #include <stdlib.h>
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+#ifdef HAVE_GNUTLS
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+#include <gnutls/crypto.h>
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+#endif
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+
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 QPDFWriter::Members::Members(QPDF& pdf) :
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     pdf(pdf),
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     filename("unspecified"),
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@@ -321,6 +325,13 @@ void
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 QPDFWriter::setDeterministicID(bool val)
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 {
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     this->m->deterministic_id = val;
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+
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+#ifdef HAVE_GNUTLS
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+    if (val)
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+	GNUTLS_FIPS140_SET_LAX_MODE();
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+    else
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+	GNUTLS_FIPS140_SET_STRICT_MODE();
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+#endif
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 }
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 void
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@@ -342,6 +353,13 @@ void
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 QPDFWriter::setPreserveEncryption(bool val)
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 {
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     this->m->preserve_encryption = val;
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+
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+#ifdef HAVE_GNUTLS
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+    if (val)
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+	GNUTLS_FIPS140_SET_STRICT_MODE();
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+    else
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+	GNUTLS_FIPS140_SET_LAX_MODE();
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+#endif
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 }
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 void