1 files changed, 98 insertions, 0 deletions
diff --git a/include/svl/cryptosign.hxx b/include/svl/cryptosign.hxx
new file mode 100644
index 000000000..3bb682916
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+++ b/include/svl/cryptosign.hxx
@@ -0,0 +1,98 @@
+/* -*- 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 <sal/types.h>
+
+#include <utility>
+#include <vector>
+
+#include <rtl/strbuf.hxx>
+#include <rtl/ustring.hxx>
+
+#include <com/sun/star/uno/Reference.hxx>
+
+#include <svl/svldllapi.h>
+
+// Is this length truly the maximum possible, or just a number that
+// seemed large enough when the author tested this (with some type of
+// certificates)? I suspect the latter.
+
+// Used to be 0x4000 = 16384, but a sample signed PDF (produced by
+// some other software) provided by the customer has a signature
+// content that is 30000 bytes. The SampleSignedPDFDocument.pdf from
+// Adobe has one that is 21942 bytes. So let's be careful. Pity this
+// can't be dynamic, at least not without restructuring the code. Also
+// note that the checks in the code for this being too small
+// apparently are broken, if this overflows you end up with an invalid
+// PDF. Need to fix that.
+
+#define MAX_SIGNATURE_CONTENT_LENGTH 50000
+
+namespace com::sun::star::security { class XCertificate; }
+class SvStream;
+struct SignatureInformation;
+
+namespace svl::crypto {
+
+/// Converts a hex-encoded string into a byte array.
+SVL_DLLPUBLIC std::vector<unsigned char> DecodeHexString(std::string_view rHex);
+
+/// Helper to cryptographically sign and verify
+/// arbitrary data blocks.
+class SVL_DLLPUBLIC Signing
+{
+public:
+
+    Signing(css::uno::Reference<css::security::XCertificate> xCertificate) :
+        m_xCertificate(std::move(xCertificate))
+    {
+    }
+
+    /// Add a range to sign.
+    /// Note: for efficiency this takes a naked pointer, which must remain valid
+    /// until this object is discarded.
+    void AddDataRange(const void* pData, sal_Int32 size)
+    {
+        m_dataBlocks.emplace_back(pData, size);
+    }
+
+    void SetSignTSA(const OUString& tsa) { m_aSignTSA = tsa; }
+    void SetSignPassword(const OUString& password) { m_aSignPassword = password; }
+
+    /// Signs one or more data blocks (as a single, contiguous, array).
+    /// Returns the signature (in PKCS#7 format) as string (hex).
+    bool Sign(OStringBuffer& rCMSHexBuffer);
+
+    /// Verify and get Signature Information given a byte array.
+    static bool Verify(const std::vector<unsigned char>& aData,
+                       const bool bNonDetached,
+                       const std::vector<unsigned char>& aSignature,
+                       SignatureInformation& rInformation);
+
+    /// Verify and get Signature Information given a signature and stream.
+    static bool Verify(SvStream& rStream,
+                       const std::vector<std::pair<size_t, size_t>>& aByteRanges,
+                       const bool bNonDetached,
+                       const std::vector<unsigned char>& aSignature,
+                       SignatureInformation& rInformation);
+
+private:
+    /// The certificate to use for signing.
+    const css::uno::Reference<css::security::XCertificate> m_xCertificate;
+
+    /// Data blocks (pointer-size pairs).
+    std::vector<std::pair<const void*, sal_Int32>> m_dataBlocks;
+    OUString m_aSignTSA;
+    OUString m_aSignPassword;
+};
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
+