[#BN_BLINDING_create_param]
= BN_BLINDING_create_param
:mrdocs:

Create or refresh RSA blinding factors A and Aˆ‐1 mod `m.`

== Synopsis

Declared in `<openssl/bn.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BN_BLINDING.adoc[BN_BLINDING]*
BN_BLINDING_create_param(
    xref:BN_BLINDING.adoc[BN_BLINDING]* b,
    xref:BIGNUM.adoc[BIGNUM] const* e,
    xref:BIGNUM.adoc[BIGNUM]* m,
    xref:BN_CTX.adoc[BN_CTX]* ctx,
    int(* bn_mod_exp)(xref:BIGNUM.adoc[BIGNUM]*, xref:BIGNUM.adoc[BIGNUM] const*, xref:BIGNUM.adoc[BIGNUM] const*, xref:BIGNUM.adoc[BIGNUM] const*, xref:BN_CTX.adoc[BN_CTX]*, xref:BN_MONT_CTX.adoc[BN_MONT_CTX]*),
    xref:BN_MONT_CTX.adoc[BN_MONT_CTX]* m_ctx);
----

== Return Value

Blinding object on success, or NULL on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *b*
| Existing BN_BLINDING to reuse, or NULL to allocate a new one.
| *e*
| Public exponent used when generating fresh factors (may be NULL to keep the stored value).
| *m*
| Modulus (copied into the blinding object when `b` is newly allocated).
| *ctx*
| BN_CTX scratch space.
| *bn_mod_exp*
| Modular exponentiation callback used internally, or NULL for BN_mod_exp_mont().
| *m_ctx*
| Optional Montgomery context passed to `bn_mod_exp,` or NULL.
|===


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