[#BN_BLINDING_convert_ex]
= BN_BLINDING_convert_ex
:mrdocs:

Blind `n` using `b,` optionally storing the inverse factor in `r.`

== Synopsis

Declared in `<openssl/bn.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
BN_BLINDING_convert_ex(
    xref:BIGNUM.adoc[BIGNUM]* n,
    xref:BIGNUM.adoc[BIGNUM]* r,
    xref:BN_BLINDING.adoc[BN_BLINDING]* b,
    xref:BN_CTX.adoc[BN_CTX]* ctx);
----

== Return Value

1 on success, or 0 on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *n*
| Value updated in place to its blinded form.
| *r*
| Optional destination for the inverse blinding factor, or NULL.
| *b*
| Blinding parameters from BN_BLINDING_new() or BN_BLINDING_create_param().
| *ctx*
| BN_CTX scratch space.
|===


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