[#BN_bin2bn]
= BN_bin2bn
:mrdocs:

Convert `len` big‐endian unsigned bytes at `s` into a BIGNUM.

== Synopsis

Declared in `<openssl/bn.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BIGNUM.adoc[BIGNUM]*
BN_bin2bn(
    unsigned char const* s,
    int len,
    xref:BIGNUM.adoc[BIGNUM]* ret);
----

== Return Value

Result BIGNUM (possibly newly allocated), or NULL on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *s*
| Input byte string (most significant byte first).
| *len*
| Number of bytes at `s.`
| *ret*
| Existing BIGNUM to reuse, or NULL to allocate.
|===


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