text: /*-------------------------------------------------------------------------
   *
   * scram.h
   *	  Interface to libpq/scram.c
   *
   * Portions Copyright (c) 1996-2017, PostgreSQL Global Development Group
   * Portions Copyright (c) 1994, Regents of the University of California
   *
   * src/include/libpq/scram.h
   *
   *-------------------------------------------------------------------------
   */
  #ifndef PG_SCRAM_H
  #define PG_SCRAM_H
  
  /* Name of SCRAM-SHA-256 per IANA */
  #define SCRAM_SHA256_NAME "SCRAM-SHA-256"
  
  /* Status codes for message exchange */
  #define SASL_EXCHANGE_CONTINUE		0
  #define SASL_EXCHANGE_SUCCESS		1
  #define SASL_EXCHANGE_FAILURE		2
  
  /* Routines dedicated to authentication */
  extern void *pg_be_scram_init(const char *username, const char *shadow_pass);
  extern int pg_be_scram_exchange(void *opaq, char *input, int inputlen,
  					 char **output, int *outputlen, char **logdetail);
  
  /* Routines to handle and check SCRAM-SHA-256 verifier */
  extern char *pg_be_scram_build_verifier(const char *password);
  extern bool is_scram_verifier(const char *verifier);
  extern bool scram_verify_plain_password(const char *username,
  							const char *password, const char *verifier);
  
  #endif   /* PG_SCRAM_H */
  