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SRP_create_verifier(3) OpenSSL SRP_create_verifier(3)
NAME
SRP_create_verifier_ex, SRP_create_verifier, SRP_create_verifier_BN_ex,
SRP_create_verifier_BN, SRP_check_known_gN_param, SRP_get_default_gN -
SRP authentication primitives
LIBRARY
libcrypto, -lcrypto
SYNOPSIS
#include <openssl/srp.h>
The following functions have been deprecated since OpenSSL 3.0, and can
be hidden entirely by defining OPENSSL_API_COMPAT with a suitable
version value, see openssl_user_macros(7):
int SRP_create_verifier_BN_ex(const char *user, const char *pass, BIGNUM **salt,
BIGNUM **verifier, const BIGNUM *N,
const BIGNUM *g, OSSL_LIB_CTX *libctx,
const char *propq);
char *SRP_create_verifier_BN(const char *user, const char *pass, BIGNUM **salt,
BIGNUM **verifier, const BIGNUM *N, const BIGNUM *g);
char *SRP_create_verifier_ex(const char *user, const char *pass, char **salt,
char **verifier, const char *N, const char *g,
OSSL_LIB_CTX *libctx, const char *propq);
char *SRP_create_verifier(const char *user, const char *pass, char **salt,
char **verifier, const char *N, const char *g);
char *SRP_check_known_gN_param(const BIGNUM *g, const BIGNUM *N);
SRP_gN *SRP_get_default_gN(const char *id);
DESCRIPTION
All of the functions described on this page are deprecated. There are
no available replacement functions at this time.
The SRP_create_verifier_BN_ex() function creates an SRP password
verifier from the supplied parameters as defined in section 2.4 of RFC
5054 using the library context libctx and property query string propq.
Any cryptographic algorithms that need to be fetched will use the
libctx and propq. See "ALGORITHM FETCHING" in crypto(7).
SRP_create_verifier_BN() is the same as SRP_create_verifier_BN_ex()
except the default library context and property query string is used.
On successful exit *verifier will point to a newly allocated BIGNUM
containing the verifier and (if a salt was not provided) *salt will be
populated with a newly allocated BIGNUM containing a random salt. If
*salt is not NULL then the provided salt is used instead. The caller
is responsible for freeing the allocated *salt and *verifier BIGNUMS
(use BN_free(3)).
The SRP_create_verifier() function is similar to
SRP_create_verifier_BN() but all numeric parameters are in a non-
standard base64 encoding originally designed for compatibility with
libsrp. This is mainly present for historical compatibility and its use
is discouraged. It is possible to pass NULL as N and an SRP group id
as g instead to load the appropriate gN values (see
SRP_get_default_gN()). If both N and g are NULL the 8192-bit SRP group
parameters are used. The caller is responsible for freeing the
allocated *salt and *verifier (use OPENSSL_free(3)).
The SRP_check_known_gN_param() function checks that g and N are valid
SRP group parameters from RFC 5054 appendix A.
The SRP_get_default_gN() function returns the gN parameters for the RFC
5054 id SRP group size. The known ids are "1024", "1536", "2048",
"3072", "4096", "6144" and "8192".
RETURN VALUES
SRP_create_verifier_BN_ex() and SRP_create_verifier_BN() return 1 on
success and 0 on failure.
SRP_create_verifier_ex() and SRP_create_verifier() return NULL on
failure and a non-NULL value on success: "*" if N is not NULL, the
selected group id otherwise. This value should not be freed.
SRP_check_known_gN_param() returns the text representation of the group
id (i.e. the prime bit size) or NULL if the arguments are not valid SRP
group parameters. This value should not be freed.
SRP_get_default_gN() returns NULL if id is not a valid group size, or
the 8192-bit group parameters if id is NULL.
EXAMPLES
Generate and store a 8192 bit password verifier (error handling omitted
for clarity):
#include <openssl/bn.h>
#include <openssl/srp.h>
const char *username = "username";
const char *password = "password";
SRP_VBASE *srpData = SRP_VBASE_new(NULL);
SRP_gN *gN = SRP_get_default_gN("8192");
BIGNUM *salt = NULL, *verifier = NULL;
SRP_create_verifier_BN_ex(username, password, &salt, &verifier, gN->N, gN->g,
NULL, NULL);
SRP_user_pwd *pwd = SRP_user_pwd_new();
SRP_user_pwd_set1_ids(pwd, username, NULL);
SRP_user_pwd_set0_sv(pwd, salt, verifier);
SRP_user_pwd_set_gN(pwd, gN->g, gN->N);
SRP_VBASE_add0_user(srpData, pwd);
SEE ALSO
openssl-srp(1), SRP_VBASE_new(3), SRP_user_pwd_new(3)
HISTORY
SRP_create_verifier_BN_ex() and SRP_create_verifier_ex() were
introduced in OpenSSL 3.0. All other functions were added in OpenSSL
1.0.1.
All of these functions were deprecated in OpenSSL 3.0.
COPYRIGHT
Copyright 2018-2021 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the Apache License 2.0 (the "License"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file LICENSE in the source distribution or at
<https://www.openssl.org/source/license.html>.
3.0.12 2023-05-07 SRP_create_verifier(3)