void cast6_enc(void *buffer, const cast6_ctx_t *ctx);
void cast6_dec(void *buffer, const cast6_ctx_t *ctx);
void cast6_init(const void *key, uint16_t keysize_b, cast6_ctx_t *ctx);
void cast6_enc(void *buffer, const cast6_ctx_t *ctx);
void cast6_dec(void *buffer, const cast6_ctx_t *ctx);
void cast6_init(const void *key, uint16_t keysize_b, cast6_ctx_t *ctx);