234 lines
7.9 KiB
Groff
234 lines
7.9 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "SRP_CREATE_VERIFIER 3"
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.TH SRP_CREATE_VERIFIER 3 "2020-03-02" "3.0.0-dev" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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SRP_create_verifier,
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SRP_create_verifier_BN,
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SRP_check_known_gN_param,
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SRP_get_default_gN
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\&\- SRP authentication primitives
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/srp.h>
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\&
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\& char *SRP_create_verifier_BN(const char *user, const char *pass, BIGNUM **salt,
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\& BIGNUM **verifier, const BIGNUM *N, const BIGNUM *g);
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\& char *SRP_create_verifier(const char *user, const char *pass, char **salt,
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\& char **verifier, const char *N, const char *g);
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\&
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\& char *SRP_check_known_gN_param(const BIGNUM *g, const BIGNUM *N);
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\& SRP_gN *SRP_get_default_gN(const char *id);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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The \fISRP_create_verifier_BN()\fR function creates an \s-1SRP\s0 password verifier from
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the supplied parameters as defined in section 2.4 of \s-1RFC\s0 5054.
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On successful exit \fB*verifier\fR will point to a newly allocated \s-1BIGNUM\s0 containing
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the verifier and (if a salt was not provided) \fB*salt\fR will be populated with a
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newly allocated \s-1BIGNUM\s0 containing a random salt. If \fB*salt\fR is not \s-1NULL\s0 then
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the provided salt is used instead.
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The caller is responsible for freeing the allocated \fB*salt\fR and \fB*verifier\fR
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\&\s-1BIGNUMS\s0 (use \fIBN_free\fR\|(3)).
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.PP
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The \fISRP_create_verifier()\fR function is similar to \fISRP_create_verifier_BN()\fR but
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all numeric parameters are in a non-standard base64 encoding originally designed
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for compatibility with libsrp. This is mainly present for historical compatibility
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and its use is discouraged.
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It is possible to pass \s-1NULL\s0 as \fBN\fR and an \s-1SRP\s0 group id as \fBg\fR instead to
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load the appropriate gN values (see \fISRP_get_default_gN()\fR).
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If both \fBN\fR and \fBg\fR are \s-1NULL\s0 the 8192\-bit \s-1SRP\s0 group parameters are used.
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The caller is responsible for freeing the allocated \fB*salt\fR and \fB*verifier\fR
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(use \fIOPENSSL_free\fR\|(3)).
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.PP
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The \fISRP_check_known_gN_param()\fR function checks that \fBg\fR and \fBN\fR are valid
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\&\s-1SRP\s0 group parameters from \s-1RFC\s0 5054 appendix A.
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.PP
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The \fISRP_get_default_gN()\fR function returns the gN parameters for the \s-1RFC\s0 5054 \fBid\fR
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\&\s-1SRP\s0 group size.
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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".
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fISRP_create_verifier_BN()\fR returns 1 on success and 0 on failure.
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.PP
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\&\fISRP_create_verifier()\fR returns \s-1NULL\s0 on failure and a non-NULL value on success:
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\&\*(L"*\*(R" if \fBN\fR is not \s-1NULL\s0, the selected group id otherwise. This value should
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not be freed.
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.PP
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\&\fISRP_check_known_gN_param()\fR returns the text representation of the group id
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(ie. the prime bit size) or \s-1NULL\s0 if the arguments are not valid \s-1SRP\s0 group parameters.
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This value should not be freed.
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.PP
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\&\fISRP_get_default_gN()\fR returns \s-1NULL\s0 if \fBid\fR is not a valid group size,
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or the 8192\-bit group parameters if \fBid\fR is \s-1NULL\s0.
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.SH "EXAMPLES"
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.IX Header "EXAMPLES"
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Generate and store a 8192 bit password verifier (error handling
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omitted for clarity):
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.PP
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.Vb 2
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\& #include <openssl/bn.h>
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\& #include <openssl/srp.h>
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\&
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\& const char *username = "username";
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\& const char *password = "password";
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\&
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\& SRP_VBASE *srpData = SRP_VBASE_new(NULL);
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\&
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\& SRP_gN *gN = SRP_get_default_gN("8192");
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\&
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\& BIGNUM *salt = NULL, *verifier = NULL;
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\& SRP_create_verifier_BN(username, password, &salt, &verifier, gN\->N, gN\->g);
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\&
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\& SRP_user_pwd *pwd = SRP_user_pwd_new();
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\& SRP_user_pwd_set1_ids(pwd, username, NULL);
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\& SRP_user_pwd_set0_sv(pwd, salt, verifier);
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\& SRP_user_pwd_set_gN(pwd, gN\->g, gN\->N);
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\&
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\& SRP_VBASE_add0_user(srpData, pwd);
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.Ve
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIopenssl\-srp\fR\|(1),
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\&\fISRP_VBASE_new\fR\|(3),
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\&\fISRP_user_pwd_new\fR\|(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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These functions were added in OpenSSL 1.0.1.
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2018 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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