Rename RC4 implementation (non-bisectable)

1 files changed, 28 insertions, 0 deletions

diff --git a/libqpdf/qpdf/RC4_native.hh b/libqpdf/qpdf/RC4_native.hh
new file mode 100644
index 00000000..a2aa5dce
--- /dev/null
+++ b/libqpdf/qpdf/RC4_native.hh
@@ -0,0 +1,28 @@
+#ifndef RC4_HH
+#define RC4_HH
+
+#include <stddef.h>
+
+class RC4
+{
+  public:
+    // key_len of -1 means treat key_data as a null-terminated string
+    RC4(unsigned char const* key_data, int key_len = -1);
+
+    // out_data = 0 means to encrypt/decrypt in place
+    void process(unsigned char* in_data, size_t len,
+                 unsigned char* out_data = 0);
+
+  private:
+    class RC4Key
+    {
+      public:
+        unsigned char state[256];
+        unsigned char x;
+        unsigned char y;
+    };
+
+    RC4Key key;
+};
+
+#endif // RC4_HH