71 lines
2.3 KiB
C
71 lines
2.3 KiB
C
/*-------------------------------------------------------------------------
|
|
*
|
|
* scram-common.h
|
|
* Declarations for helper functions used for SCRAM authentication
|
|
*
|
|
* Portions Copyright (c) 1996-2019, 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 */
|