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.\" ========================================================================
.\"
.IX Title "SRP_CREATE_VERIFIER 3ossl"
.TH SRP_CREATE_VERIFIER 3ossl "2024-09-03" "3.1.7+quic" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "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
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/srp.h>
.Ve
.PP
The following functions have been deprecated since OpenSSL 3.0, and can be
hidden entirely by defining \fB\s-1OPENSSL_API_COMPAT\s0\fR with a suitable version value,
see \fBopenssl_user_macros\fR\|(7):
.PP
.Vb 11
\& 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);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
All of the functions described on this page are deprecated. There are no
available replacement functions at this time.
.PP
The \fBSRP_create_verifier_BN_ex()\fR function creates an \s-1SRP\s0 password verifier from
the supplied parameters as defined in section 2.4 of \s-1RFC 5054\s0 using the library
context \fIlibctx\fR and property query string \fIpropq\fR. Any cryptographic
algorithms that need to be fetched will use the \fIlibctx\fR and \fIpropq\fR. See
\&\*(L"\s-1ALGORITHM FETCHING\*(R"\s0 in \fBcrypto\fR\|(7).
.PP
\&\fBSRP_create_verifier_BN()\fR is the same as \fBSRP_create_verifier_BN_ex()\fR except the
default library context and property query string is used.
.PP
On successful exit \fI*verifier\fR will point to a newly allocated \s-1BIGNUM\s0 containing
the verifier and (if a salt was not provided) \fI*salt\fR will be populated with a
newly allocated \s-1BIGNUM\s0 containing a random salt. If \fI*salt\fR is not \s-1NULL\s0 then
the provided salt is used instead.
The caller is responsible for freeing the allocated \fI*salt\fR and \fI*verifier\fR
\&\s-1BIGNUMS\s0 (use \fBBN_free\fR\|(3)).
.PP
The \fBSRP_create_verifier()\fR function is similar to \fBSRP_create_verifier_BN()\fR 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 \s-1NULL\s0 as \fIN\fR and an \s-1SRP\s0 group id as \fIg\fR instead to
load the appropriate gN values (see \fBSRP_get_default_gN()\fR).
If both \fIN\fR and \fIg\fR are \s-1NULL\s0 the 8192\-bit \s-1SRP\s0 group parameters are used.
The caller is responsible for freeing the allocated \fI*salt\fR and \fI*verifier\fR
(use \fBOPENSSL_free\fR\|(3)).
.PP
The \fBSRP_check_known_gN_param()\fR function checks that \fIg\fR and \fIN\fR are valid
\&\s-1SRP\s0 group parameters from \s-1RFC 5054\s0 appendix A.
.PP
The \fBSRP_get_default_gN()\fR function returns the gN parameters for the \s-1RFC 5054\s0 \fIid\fR
\&\s-1SRP\s0 group size.
The known ids are \*(L"1024\*(R", \*(L"1536\*(R", \*(L"2048\*(R", \*(L"3072\*(R", \*(L"4096\*(R", \*(L"6144\*(R" and \*(L"8192\*(R".
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBSRP_create_verifier_BN_ex()\fR and \fBSRP_create_verifier_BN()\fR return 1 on success and
0 on failure.
.PP
\&\fBSRP_create_verifier_ex()\fR and \fBSRP_create_verifier()\fR return \s-1NULL\s0 on failure and a
non-NULL value on success:
\&\*(L"*\*(R" if \fIN\fR is not \s-1NULL,\s0 the selected group id otherwise. This value should
not be freed.
.PP
\&\fBSRP_check_known_gN_param()\fR returns the text representation of the group id
(i.e. the prime bit size) or \s-1NULL\s0 if the arguments are not valid \s-1SRP\s0 group parameters.
This value should not be freed.
.PP
\&\fBSRP_get_default_gN()\fR returns \s-1NULL\s0 if \fIid\fR is not a valid group size,
or the 8192\-bit group parameters if \fIid\fR is \s-1NULL.\s0
.SH "EXAMPLES"
.IX Header "EXAMPLES"
Generate and store a 8192 bit password verifier (error handling
omitted for clarity):
.PP
.Vb 2
\& #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);
.Ve
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBopenssl\-srp\fR\|(1),
\&\fBSRP_VBASE_new\fR\|(3),
\&\fBSRP_user_pwd_new\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
\&\fBSRP_create_verifier_BN_ex()\fR and \fBSRP_create_verifier_ex()\fR were introduced in
OpenSSL 3.0. All other functions were added in OpenSSL 1.0.1.
.PP
All of these functions were deprecated in OpenSSL 3.0.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2018\-2021 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.