1 files changed, 92 insertions, 0 deletions
diff --git a/src/stream/stream_cipher.h b/src/stream/stream_cipher.h
new file mode 100644
index 000000000..6c013c6d6
--- /dev/null
+++ b/src/stream/stream_cipher.h
@@ -0,0 +1,92 @@
+/**
+* Stream Cipher
+* (C) 1999-2007 Jack Lloyd
+*/
+
+#ifndef BOTAN_STREAM_CIPHER_H__
+#define BOTAN_STREAM_CIPHER_H__
+
+#include <botan/exceptn.h>
+#include <botan/symkey.h>
+#include <botan/sym_algo.h>
+
+namespace Botan {
+
+/*************************************************
+* Stream Cipher                                  *
+*************************************************/
+class BOTAN_DLL StreamCipher : public SymmetricAlgorithm
+   {
+   public:
+      const u32bit IV_LENGTH;
+
+      /**
+      * Encrypt a message.
+      * @param i the plaintext
+      * @param o the byte array to hold the output, i.e. the ciphertext
+      * @param len the length of both i and o
+      */
+      void encrypt(const byte i[], byte o[], u32bit len) { cipher(i, o, len); }
+
+      /**
+      * Decrypt a message.
+      * @param i the ciphertext to decrypt
+      * @param o the byte array to hold the output, i.e. the plaintext
+      * @param len the length of both i and o
+      */
+      void decrypt(const byte i[], byte o[], u32bit len) { cipher(i, o, len); }
+
+      /**
+      * Encrypt a message.
+      * @param in the plaintext as input, after the function has
+      * returned it will hold the ciphertext
+
+      * @param len the length of in
+      */
+      void encrypt(byte in[], u32bit len) { cipher(in, in, len); }
+
+      /**
+      * Decrypt a message.
+      * @param in the ciphertext as input, after the function has
+      * returned it will hold the plaintext
+      * @param len the length of in
+      */
+      void decrypt(byte in[], u32bit len) { cipher(in, in, len); }
+
+      /**
+      * Resync the cipher using the IV
+      * @param iv the initialization vector
+      * @param iv_len the length of the IV in bytes
+      */
+      virtual void resync(const byte iv[], u32bit iv_len);
+
+      /**
+      * Seek ahead in the stream.
+      * @param len the length to seek ahead.
+      */
+      virtual void seek(u32bit len);
+
+      /**
+      * Get a new object representing the same algorithm as *this
+      */
+      virtual StreamCipher* clone() const = 0;
+
+      /**
+      * Zeroize internal state
+      */
+      virtual void clear() throw() = 0;
+
+      StreamCipher(u32bit key_min, u32bit key_max = 0,
+                   u32bit key_mod = 1,
+                   u32bit iv_len = 0) :
+         SymmetricAlgorithm(key_min, key_max, key_mod),
+         IV_LENGTH(iv_len) {}
+
+      virtual ~StreamCipher() {}
+   private:
+      virtual void cipher(const byte[], byte[], u32bit) = 0;
+   };
+
+}
+
+#endif