[#SRP_Calc_client_key_ex]
= SRP_Calc_client_key_ex
:mrdocs:

Compute the client session key K for TLS‐SRP.

== Synopsis

Declared in `<openssl/srp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
xref:BIGNUM.adoc[BIGNUM]*
SRP_Calc_client_key_ex(
    xref:BIGNUM.adoc[BIGNUM] const* N,
    xref:BIGNUM.adoc[BIGNUM] const* B,
    xref:BIGNUM.adoc[BIGNUM] const* g,
    xref:BIGNUM.adoc[BIGNUM] const* x,
    xref:BIGNUM.adoc[BIGNUM] const* a,
    xref:BIGNUM.adoc[BIGNUM] const* u,
    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 session key, or NULL on error. Caller must free.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *N*
| Safe prime modulus.
| *B*
| Server public value.
| *g*
| Generator.
| *x*
| Private exponent from SRP_Calc_x().
| *a*
| Client secret exponent.
| *u*
| Scrambling parameter from SRP_Calc_u().
| *libctx*
| Library context for algorithm fetching, or NULL for default.
| *propq*
| Property query for algorithm fetching, or NULL.
|===


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