[#ASN1_BIT_STRING_set]
= ASN1_BIT_STRING_set
:mrdocs:

Replace the raw bit‐string payload of an ASN1_BIT_STRING.

== Synopsis

Declared in `<openssl/asn1.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
ASN1_BIT_STRING_set(
    xref:ASN1_BIT_STRING.adoc[ASN1_BIT_STRING]* a,
    unsigned char* d,
    int length);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *a*
| Bit string to update.
| *d*
| Bytes to copy into the string (treated as the bit‐string content octets).
| *length*
| Number of bytes at `d,` or ‐1 to use strlen on `d.`
|===


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