Blowfish_decipher
void Blowfish_decipher(blf_ctx *, u_int32_t *, u_int32_t *);
Blowfish_decipher(c, d, d + 1);
Blowfish_decipher(c, &l, &r);
Blowfish_decipher(c, &l, &r);
Blowfish_decipher(c, &l, &r);