--- /dev/null
+// from http://www.efgh.com/software/rijndael.htm (public domain)
+
+#ifndef H__RIJNDAEL
+#define H__RIJNDAEL
+
+#include "d0.h"
+
+D0_EXPORT int d0_rijndael_setup_encrypt(unsigned long *rk, const unsigned char *key,
+ int keybits);
+D0_EXPORT int d0_rijndael_setup_decrypt(unsigned long *rk, const unsigned char *key,
+ int keybits);
+D0_EXPORT void d0_rijndael_encrypt(const unsigned long *rk, int nrounds,
+ const unsigned char plaintext[16], unsigned char ciphertext[16]);
+D0_EXPORT void d0_rijndael_decrypt(const unsigned long *rk, int nrounds,
+ const unsigned char ciphertext[16], unsigned char plaintext[16]);
+
+#define D0_RIJNDAEL_KEYLENGTH(keybits) ((keybits)/8)
+#define D0_RIJNDAEL_RKLENGTH(keybits) ((keybits)/8+28)
+#define D0_RIJNDAEL_NROUNDS(keybits) ((keybits)/32+6)
+
+#endif