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

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>.