[#BN_mpi2bn]
= BN_mpi2bn
:mrdocs:

Decode an MPI‐format integer (4‐byte length prefix plus big‐endian content).

== Synopsis

Declared in `<openssl/bn.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BIGNUM.adoc[BIGNUM]*
BN_mpi2bn(
    unsigned char const* s,
    int len,
    xref:BIGNUM.adoc[BIGNUM]* ret);
----

== Return Value

Result BIGNUM, or NULL on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *s*
| MPI‐encoded input buffer.
| *len*
| Number of bytes at `s.`
| *ret*
| Destination BIGNUM to reuse, or NULL to allocate a new one.
|===


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