[#BN_mod_exp_mont_consttime_x2]
= BN_mod_exp_mont_consttime_x2
:mrdocs:

Compute two constant‐time Montgomery modular exponentiations together.

== Synopsis

Declared in `<openssl/bn.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
BN_mod_exp_mont_consttime_x2(
    xref:BIGNUM.adoc[BIGNUM]* rr1,
    xref:BIGNUM.adoc[BIGNUM] const* a1,
    xref:BIGNUM.adoc[BIGNUM] const* p1,
    xref:BIGNUM.adoc[BIGNUM] const* m1,
    xref:BN_MONT_CTX.adoc[BN_MONT_CTX]* in_mont1,
    xref:BIGNUM.adoc[BIGNUM]* rr2,
    xref:BIGNUM.adoc[BIGNUM] const* a2,
    xref:BIGNUM.adoc[BIGNUM] const* p2,
    xref:BIGNUM.adoc[BIGNUM] const* m2,
    xref:BN_MONT_CTX.adoc[BN_MONT_CTX]* in_mont2,
    xref:BN_CTX.adoc[BN_CTX]* ctx);
----

== Return Value

1 on success, or 0 on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *rr1*
| Destination for (a1 ˆ p1) mod m1.
| *a1*
| First base.
| *p1*
| First exponent.
| *m1*
| First odd modulus.
| *in_mont1*
| Optional Montgomery context for `m1,` or NULL.
| *rr2*
| Destination for (a2 ˆ p2) mod m2.
| *a2*
| Second base.
| *p2*
| Second exponent.
| *m2*
| Second odd modulus.
| *in_mont2*
| Optional Montgomery context for `m2,` or NULL.
| *ctx*
| BN_CTX for temporary storage.
|===


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