add zen/open_ssl.cpp from upstream

   Upstream added this file which was a hard dependency that should be
   bundled. See https://freefilesync.org/forum/viewtopic.php?t=6486.

1 files changed, 49 insertions, 0 deletions

diff --git a/zen/open_ssl.h b/zen/open_ssl.h
new file mode 100644
index 00000000..5bf4e9ce
--- /dev/null
+++ b/zen/open_ssl.h
@@ -0,0 +1,49 @@
+// *****************************************************************************
+// * This file is part of the FreeFileSync project. It is distributed under    *
+// * GNU General Public License: https://www.gnu.org/licenses/gpl-3.0          *
+// * Copyright (C) Zenju (zenju AT freefilesync DOT org) - All Rights Reserved *
+// *****************************************************************************
+
+#ifndef OPEN_SSL_H_801974580936508934568792347506
+#define OPEN_SSL_H_801974580936508934568792347506
+
+#include <zen/zstring.h>
+#include <zen/sys_error.h>
+
+
+namespace zen //init OpenSSL before use!
+{
+enum class RsaStreamType
+{
+    pkix,  //base-64-encoded SubjectPublicKeyInfo structure ("BEGIN PUBLIC KEY")
+    pkcs1, //base-64-encoded RSA number and exponent ("BEGIN RSA PUBLIC KEY")
+    pkcs1_raw
+};
+
+//verify signatures produced with: "openssl dgst -sha256 -sign private.pem -out file.sig file.txt"
+void verifySignature(const std::string& message,
+                     const std::string& signature,
+                     const std::string& publicKeyStream,
+                     RsaStreamType streamType); //throw SysError
+
+std::string convertRsaKey(const std::string& keyStream, RsaStreamType typeFrom, RsaStreamType typeTo, bool publicKey); //throw SysError
+
+
+class TlsContext
+{
+public:
+    TlsContext(int socket, //throw SysError
+               const Zstring& server,
+               const Zstring* caCertFilePath /*optional: enable certificate validation*/);
+    ~TlsContext();
+
+    size_t tryRead(       void* buffer, size_t bytesToRead ); //throw SysError; may return short, only 0 means EOF!
+    size_t tryWrite(const void* buffer, size_t bytesToWrite); //throw SysError; may return short! CONTRACT: bytesToWrite > 0
+
+private:
+    class Impl;
+    const std::unique_ptr<Impl> pimpl_;
+};
+}
+
+#endif //OPEN_SSL_H_801974580936508934568792347506