Add back min_keylength_of, max_keylength_of, keylength_multiple_of

functions for backwards compatability.

1 files changed, 57 insertions, 0 deletions

diff --git a/src/libstate/lookup.cpp b/src/libstate/lookup.cpp
index 24a46e3e9..0d3f33573 100644
--- a/src/libstate/lookup.cpp
+++ b/src/libstate/lookup.cpp
@@ -62,6 +62,63 @@ size_t output_length_of(const std::string& name)
    }
 
 /*
+* Query the minimum allowed key length of an algorithm implementation
+*/
+size_t min_keylength_of(const std::string& name)
+   {
+   Algorithm_Factory& af = global_state().algorithm_factory();
+
+   if(const BlockCipher* bc = af.prototype_block_cipher(name))
+      return bc->key_spec().minimum_keylength();
+
+   if(const StreamCipher* sc = af.prototype_stream_cipher(name))
+      return sc->key_spec().minimum_keylength();
+
+   if(const MessageAuthenticationCode* mac = af.prototype_mac(name))
+      return mac->key_spec().minimum_keylength();
+
+   throw Algorithm_Not_Found(name);
+   }
+
+/*
+* Query the maximum allowed keylength of an algorithm implementation
+*/
+size_t max_keylength_of(const std::string& name)
+   {
+   Algorithm_Factory& af = global_state().algorithm_factory();
+
+   if(const BlockCipher* bc = af.prototype_block_cipher(name))
+      return bc->key_spec().maximum_keylength();
+
+   if(const StreamCipher* sc = af.prototype_stream_cipher(name))
+      return sc->key_spec().maximum_keylength();
+
+   if(const MessageAuthenticationCode* mac = af.prototype_mac(name))
+      return mac->key_spec().maximum_keylength();
+
+   throw Algorithm_Not_Found(name);
+   }
+
+/*
+* Query the number of byte a valid key must be a multiple of
+*/
+size_t keylength_multiple_of(const std::string& name)
+   {
+   Algorithm_Factory& af = global_state().algorithm_factory();
+
+   if(const BlockCipher* bc = af.prototype_block_cipher(name))
+      return bc->key_spec().keylength_multiple();
+
+   if(const StreamCipher* sc = af.prototype_stream_cipher(name))
+      return sc->key_spec().keylength_multiple();
+
+   if(const MessageAuthenticationCode* mac = af.prototype_mac(name))
+      return mac->key_spec().keylength_multiple();
+
+   throw Algorithm_Not_Found(name);
+   }
+
+/*
 * Get a cipher object
 */
 Keyed_Filter* get_cipher(const std::string& algo_spec,