[#ASN1_BIT_STRING_set_bit]
= ASN1_BIT_STRING_set_bit
:mrdocs:

Set or clear a single bit in an ASN.1 BIT STRING.

== Synopsis

Declared in `<openssl/asn1.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
ASN1_BIT_STRING_set_bit(
    xref:ASN1_BIT_STRING.adoc[ASN1_BIT_STRING]* a,
    int n,
    int value);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *a*
| Bit string to update (resized as needed).
| *n*
| Zero‐based bit index to change.
| *value*
| Nonzero to set the bit, or 0 to clear it.
|===


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