1 files changed, 56 insertions, 0 deletions
diff --git a/comm/third_party/botan/src/lib/stream/ofb/ofb.h b/comm/third_party/botan/src/lib/stream/ofb/ofb.h
new file mode 100644
index 0000000000..994d3d198d
--- /dev/null
+++ b/comm/third_party/botan/src/lib/stream/ofb/ofb.h
@@ -0,0 +1,56 @@
+/*
+* OFB Mode
+* (C) 1999-2007 Jack Lloyd
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+
+#ifndef BOTAN_OUTPUT_FEEDBACK_MODE_H_
+#define BOTAN_OUTPUT_FEEDBACK_MODE_H_
+
+#include <botan/stream_cipher.h>
+#include <botan/block_cipher.h>
+
+BOTAN_FUTURE_INTERNAL_HEADER(ofb.h)
+
+namespace Botan {
+
+/**
+* Output Feedback Mode
+*/
+class BOTAN_PUBLIC_API(2,0) OFB final : public StreamCipher
+   {
+   public:
+      void cipher(const uint8_t in[], uint8_t out[], size_t length) override;
+
+      void set_iv(const uint8_t iv[], size_t iv_len) override;
+
+      size_t default_iv_length() const override;
+
+      bool valid_iv_length(size_t iv_len) const override;
+
+      Key_Length_Specification key_spec() const override;
+
+      std::string name() const override;
+
+      OFB* clone() const override;
+
+      void clear() override;
+
+      /**
+      * @param cipher the block cipher to use
+      */
+      explicit OFB(BlockCipher* cipher);
+
+      void seek(uint64_t offset) override;
+   private:
+      void key_schedule(const uint8_t key[], size_t key_len) override;
+
+      std::unique_ptr<BlockCipher> m_cipher;
+      secure_vector<uint8_t> m_buffer;
+      size_t m_buf_pos;
+   };
+
+}
+
+#endif