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Title "SRP_CREATE_VERIFIER 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
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 Header "SYNOPSIS" .Vb 1 #include <openssl/srp.h> .Ve

The following functions have been deprecated since OpenSSL 3.0, and can be hidden entirely by defining \s-1OPENSSL_API_COMPAT\s0 with a suitable version value, see openssl_user_macros\|(7):

.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

Header "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 \s-1SRP\s0 password verifier from the supplied parameters as defined in section 2.4 of \s-1RFC 5054\s0 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 \*(L"\s-1ALGORITHM FETCHING\*(R"\s0 in crypto\|(7).

\fBSRP_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 \s-1BIGNUM\s0 containing the verifier and (if a salt was not provided) *salt will be populated with a newly allocated \s-1BIGNUM\s0 containing a random salt. If *salt is not \s-1NULL\s0 then the provided salt is used instead. The caller is responsible for freeing the allocated *salt and *verifier \s-1BIGNUMS\s0 (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 \s-1NULL\s0 as N and an \s-1SRP\s0 group id as g instead to load the appropriate gN values (see SRP_get_default_gN()). If both N and g are \s-1NULL\s0 the 8192-bit \s-1SRP\s0 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 \s-1SRP\s0 group parameters from \s-1RFC 5054\s0 appendix A.

The SRP_get_default_gN() function returns the gN parameters for the \s-1RFC 5054\s0 id \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".

Header "RETURN VALUES" \fBSRP_create_verifier_BN_ex() and SRP_create_verifier_BN() return 1 on success and 0 on failure.

\fBSRP_create_verifier_ex() and SRP_create_verifier() return \s-1NULL\s0 on failure and a non-NULL value on success: \*(L"*\*(R" if N is not \s-1NULL,\s0 the selected group id otherwise. This value should not be freed.

\fBSRP_check_known_gN_param() 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.

\fBSRP_get_default_gN() returns \s-1NULL\s0 if id is not a valid group size, or the 8192-bit group parameters if id is \s-1NULL.\s0

Header "EXAMPLES" Generate and store a 8192 bit password verifier (error handling omitted for clarity):

.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

Header "SEE ALSO" \fBopenssl-srp\|(1), \fBSRP_VBASE_new\|(3), \fBSRP_user_pwd_new\|(3) Header "HISTORY" \fBSRP_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.

Header "COPYRIGHT" Copyright 2018-2021 The OpenSSL Project Authors. All Rights Reserved.

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>.