[#BN_asc2bn]
= BN_asc2bn
:mrdocs:

Parse an ASCII decimal or hexadecimal integer into a BIGNUM.

== Synopsis

Declared in `<openssl/bn.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
BN_asc2bn(
    xref:BIGNUM.adoc[BIGNUM]** a,
    char const* str);
----

== Description

A leading '‐' sets the negative flag. Trailing non‐digit characters are ignored after a successful parse of a number prefix.

== Return Value

1 on success, or 0 on parse error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *a*
| Location of the BIGNUM pointer; allocated if *`a` is NULL.
| *str*
| Decimal digits, or a hex string with a leading "0x" / "0X".
|===


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