[#SRP_Calc_x_ex]
= SRP_Calc_x_ex
:mrdocs:

Compute the private exponent x = H(s, H(user:pass)) for TLS‐SRP.

== Synopsis

Declared in `<openssl/srp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
xref:BIGNUM.adoc[BIGNUM]*
SRP_Calc_x_ex(
    xref:BIGNUM.adoc[BIGNUM] const* s,
    char const* user,
    char const* pass,
    xref:OSSL_LIB_CTX.adoc[OSSL_LIB_CTX]* libctx,
    char const* propq);
----

[WARNING]
====
https://en.cppreference.com/cpp/language/attributes/deprecated[Deprecated^]. Use of this entity is allowed but discouraged.
====
== Return Value

Newly allocated x value, or NULL on error. Caller must free.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *s*
| Salt value.
| *user*
| User name.
| *pass*
| Password.
| *libctx*
| Library context for algorithm fetching, or NULL for default.
| *propq*
| Property query for algorithm fetching, or NULL.
|===


[.small]#Created with https://www.mrdocs.com[MrDocs]#