71 lines
2.2 KiB
C
71 lines
2.2 KiB
C
/*-------------------------------------------------------------------------
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*
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* scram-common.h
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* Declarations for helper functions used for SCRAM authentication
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*
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* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/common/scram-common.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef SCRAM_COMMON_H
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#define SCRAM_COMMON_H
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#include "common/sha2.h"
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/* Name of SCRAM mechanisms per IANA */
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#define SCRAM_SHA_256_NAME "SCRAM-SHA-256"
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#define SCRAM_SHA_256_PLUS_NAME "SCRAM-SHA-256-PLUS" /* with channel binding */
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/* Length of SCRAM keys (client and server) */
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#define SCRAM_KEY_LEN PG_SHA256_DIGEST_LENGTH
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/* length of HMAC */
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#define SHA256_HMAC_B PG_SHA256_BLOCK_LENGTH
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/*
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* Size of random nonce generated in the authentication exchange. This
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* is in "raw" number of bytes, the actual nonces sent over the wire are
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* encoded using only ASCII-printable characters.
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*/
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#define SCRAM_RAW_NONCE_LEN 18
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/*
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* Length of salt when generating new verifiers, in bytes. (It will be stored
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* and sent over the wire encoded in Base64.) 16 bytes is what the example in
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* RFC 7677 uses.
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*/
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#define SCRAM_DEFAULT_SALT_LEN 16
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/*
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* Default number of iterations when generating verifier. Should be at least
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* 4096 per RFC 7677.
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*/
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#define SCRAM_DEFAULT_ITERATIONS 4096
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/*
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* Context data for HMAC used in SCRAM authentication.
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*/
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typedef struct
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{
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pg_sha256_ctx sha256ctx;
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uint8 k_opad[SHA256_HMAC_B];
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} scram_HMAC_ctx;
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extern void scram_HMAC_init(scram_HMAC_ctx *ctx, const uint8 *key, int keylen);
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extern void scram_HMAC_update(scram_HMAC_ctx *ctx, const char *str, int slen);
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extern void scram_HMAC_final(uint8 *result, scram_HMAC_ctx *ctx);
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extern void scram_SaltedPassword(const char *password, const char *salt,
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int saltlen, int iterations, uint8 *result);
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extern void scram_H(const uint8 *str, int len, uint8 *result);
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extern void scram_ClientKey(const uint8 *salted_password, uint8 *result);
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extern void scram_ServerKey(const uint8 *salted_password, uint8 *result);
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extern char *scram_build_verifier(const char *salt, int saltlen, int iterations,
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const char *password);
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#endif /* SCRAM_COMMON_H */
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