rijndael_decrypt
void rijndael_decrypt(rijndael_ctx *, const u_char *, u_char *);
rijndael_decrypt(&ctx->key1, block, data);
rijndael_decrypt(&ctx, &c[i], &p[i]);
rijndael_decrypt(&ctx->key1, block, data);
void rijndael_decrypt(rijndael_ctx *, const u_char *, u_char *);
rijndael_decrypt(&ctx, (u_char *)(cp + i), (u_char *)(kp + i));
rijndael_decrypt(&swap_ctxt, (u_char *)ddst, (u_char *)ddst);