moved ../../pdf2swf/xpdf to .

[swftools.git] / lib / xpdf / Decrypt.h

diff --git a/lib/xpdf/Decrypt.h b/lib/xpdf/Decrypt.h
new file mode 100644 (file)
index 0000000..2beba58
--- /dev/null
+++ b/lib/xpdf/Decrypt.h
@@ -0,0 +1,63 @@
+//========================================================================
+//
+// Decrypt.h
+//
+// Copyright 1996-2003 Glyph & Cog, LLC
+//
+//========================================================================
+
+#ifndef DECRYPT_H
+#define DECRYPT_H
+
+#include <aconf.h>
+
+#ifdef USE_GCC_PRAGMAS
+#pragma interface
+#endif
+
+#include "gtypes.h"
+#include "GString.h"
+
+//------------------------------------------------------------------------
+// Decrypt
+//------------------------------------------------------------------------
+
+class Decrypt {
+public:
+
+  // Initialize the decryptor object.
+  Decrypt(Guchar *fileKey, int keyLength, int objNum, int objGen);
+
+  // Reset decryption.
+  void reset();
+
+  // Decrypt one byte.
+  Guchar decryptByte(Guchar c);
+
+  // Generate a file key.  The <fileKey> buffer must have space for at
+  // least 16 bytes.  Checks <ownerPassword> and then <userPassword>
+  // and returns true if either is correct.  Sets <ownerPasswordOk> if
+  // the owner password was correct.  Either or both of the passwords
+  // may be NULL, which is treated as an empty string.
+  static GBool makeFileKey(int encVersion, int encRevision, int keyLength,
+                          GString *ownerKey, GString *userKey,
+                          int permissions, GString *fileID,
+                          GString *ownerPassword, GString *userPassword,
+                          Guchar *fileKey, GBool encryptMetadata,
+                          GBool *ownerPasswordOk);
+
+private:
+
+  static GBool makeFileKey2(int encVersion, int encRevision, int keyLength,
+                           GString *ownerKey, GString *userKey,
+                           int permissions, GString *fileID,
+                           GString *userPassword, Guchar *fileKey,
+                           GBool encryptMetadata);
+
+  int objKeyLength;
+  Guchar objKey[21];
+  Guchar state[256];
+  Guchar x, y;
+};
+
+#endif