[#SRP_Calc_B_ex]
= SRP_Calc_B_ex
:mrdocs:

Compute the server public value B = gˆb + k*v (mod N) for TLS‐SRP.

== Synopsis

Declared in `<openssl/srp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
xref:BIGNUM.adoc[BIGNUM]*
SRP_Calc_B_ex(
    xref:BIGNUM.adoc[BIGNUM] const* b,
    xref:BIGNUM.adoc[BIGNUM] const* N,
    xref:BIGNUM.adoc[BIGNUM] const* g,
    xref:BIGNUM.adoc[BIGNUM] const* v,
    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 B value, or NULL on error. Caller must free.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *b*
| Server secret exponent.
| *N*
| Safe prime modulus.
| *g*
| Generator.
| *v*
| User password verifier.
| *libctx*
| Library context for algorithm fetching, or NULL for default.
| *propq*
| Property query for algorithm fetching, or NULL.
|===


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