Split 'cast' module into CAST-128 and CAST-256

They were only in the same place because of the desire to share
the sbox tables, but that can be handled by adding a dependency.

This makes it possible to disable CAST-256 while leaving CAST-128.

1 files changed, 40 insertions, 0 deletions

diff --git a/src/lib/block/cast128/cast128.h b/src/lib/block/cast128/cast128.h
new file mode 100644
index 000000000..3a1740777
--- /dev/null
+++ b/src/lib/block/cast128/cast128.h
@@ -0,0 +1,40 @@
+/*
+* CAST-128
+* (C) 1999-2007 Jack Lloyd
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+
+#ifndef BOTAN_CAST128_H_
+#define BOTAN_CAST128_H_
+
+#include <botan/block_cipher.h>
+
+namespace Botan {
+
+/**
+* CAST-128
+*/
+class BOTAN_PUBLIC_API(2,0) CAST_128 final : public Block_Cipher_Fixed_Params<8, 11, 16>
+   {
+   public:
+      void encrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const override;
+      void decrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const override;
+
+      void clear() override;
+      std::string name() const override { return "CAST-128"; }
+      BlockCipher* clone() const override { return new CAST_128; }
+
+   private:
+      void key_schedule(const uint8_t[], size_t) override;
+
+      static void cast_ks(secure_vector<uint32_t>& ks,
+                          secure_vector<uint32_t>& user_key);
+
+      secure_vector<uint32_t> m_MK;
+      secure_vector<uint8_t> m_RK;
+   };
+
+}
+
+#endif