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/*-------------------------------------------------------------------------
*
* scram-common.h
* Declarations for helper functions used for SCRAM authentication
*
* Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/common/scram-common.h
*
*-------------------------------------------------------------------------
*/
#ifndef SCRAM_COMMON_H
#define SCRAM_COMMON_H
#include "common/sha2.h"
/* Name of SCRAM mechanisms per IANA */
#define SCRAM_SHA_256_NAME "SCRAM-SHA-256"
#define SCRAM_SHA_256_PLUS_NAME "SCRAM-SHA-256-PLUS" /* with channel binding */
/* Length of SCRAM keys (client and server) */
#define SCRAM_KEY_LEN PG_SHA256_DIGEST_LENGTH
/* length of HMAC */
#define SHA256_HMAC_B PG_SHA256_BLOCK_LENGTH
/*
* Size of random nonce generated in the authentication exchange. This
* is in "raw" number of bytes, the actual nonces sent over the wire are
* encoded using only ASCII-printable characters.
*/
#define SCRAM_RAW_NONCE_LEN 18
/*
* Length of salt when generating new secrets, in bytes. (It will be stored
* and sent over the wire encoded in Base64.) 16 bytes is what the example in
* RFC 7677 uses.
*/
#define SCRAM_DEFAULT_SALT_LEN 16
/*
* Default number of iterations when generating secret. Should be at least
* 4096 per RFC 7677.
*/
#define SCRAM_DEFAULT_ITERATIONS 4096
/*
* Context data for HMAC used in SCRAM authentication.
*/
typedef struct
{
pg_sha256_ctx sha256ctx;
uint8 k_opad[SHA256_HMAC_B];
} scram_HMAC_ctx;
extern void scram_HMAC_init(scram_HMAC_ctx *ctx, const uint8 *key, int keylen);
extern void scram_HMAC_update(scram_HMAC_ctx *ctx, const char *str, int slen);
extern void scram_HMAC_final(uint8 *result, scram_HMAC_ctx *ctx);
extern void scram_SaltedPassword(const char *password, const char *salt,
int saltlen, int iterations, uint8 *result);
extern void scram_H(const uint8 *str, int len, uint8 *result);
extern void scram_ClientKey(const uint8 *salted_password, uint8 *result);
extern void scram_ServerKey(const uint8 *salted_password, uint8 *result);
extern char *scram_build_secret(const char *salt, int saltlen, int iterations,
const char *password);
#endif /* SCRAM_COMMON_H */
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