text: #ifndef COMMON_H
  #define COMMON_H
  
  int mul_add_as_plus_e(uint16_t *out, const uint16_t *s, const uint8_t *seed_A);
  int mul_add_sa_plus_e(uint16_t *out, const uint16_t *s, const uint8_t *seed_A);
  void sample_n(uint16_t *s, size_t n);
  void mul_bs(uint16_t *out, const uint16_t *b, const uint16_t *s);
  void mul_add_sb_plus_e(uint16_t *out, const uint16_t *b, const uint16_t *s);
  void add(uint16_t *out, const uint16_t *a, const uint16_t *b);
  void sub(uint16_t *out, const uint16_t *a, const uint16_t *b);
  void key_encode(uint16_t *out, const uint16_t *in);
  void key_decode(uint16_t *out, const uint16_t *in);
  void pack(uint8_t *out, size_t outlen, const uint16_t *in, size_t inlen, uint8_t lsb);
  void unpack(uint16_t *out, size_t outlen, const uint8_t *in, size_t inlen, uint8_t lsb);
  void clear_bytes(uint8_t *mem, size_t n);
  uint16_t LE_TO_UINT16(uint16_t n);
  uint16_t UINT16_TO_LE(uint16_t n);
  
  #endif
  