+/*
+ * Triple-DES key schedule (112-bit, encryption)
+ */
+int des3_set2key_enc( des3_context *ctx, const unsigned char key[DES_KEY_SIZE * 2] );
+
+/*
+ * Triple-DES key schedule (112-bit, decryption)
+ */
+int des3_set2key_dec( des3_context *ctx, const unsigned char key[DES_KEY_SIZE * 2] );
+
+/*
+ * Triple-DES key schedule (168-bit, encryption)
+ */
+int des3_set3key_enc( des3_context *ctx, const unsigned char key[DES_KEY_SIZE * 3] );
+
+/*
+ * Triple-DES key schedule (168-bit, decryption)
+ */
+int des3_set3key_dec( des3_context *ctx, const unsigned char key[DES_KEY_SIZE * 3] );