.\" $OpenBSD: ASN1_UNIVERSALSTRING_to_string.3,v 1.1 2021/11/15 13:39:40 schwarze Exp $
.\"
.\" Copyright (c) 2021 Ingo Schwarze <schwarze@openbsd.org>
.\"
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.Dd $Mdocdate: November 15 2021 $
.Dt ASN1_UNIVERSALSTRING_TO_STRING 3
.Os
.Sh NAME
.Nm ASN1_UNIVERSALSTRING_to_string
.Nd recode UTF-32 to ISO Latin-1
.Sh SYNOPSIS
.In openssl/asn1.h
.Ft int
.Fo ASN1_UNIVERSALSTRING_to_string
.Fa "ASN1_UNIVERSALSTRING *string"
.Fc
.Sh DESCRIPTION
.Fn ASN1_UNIVERSALSTRING_to_string
assumes that the given
.Fa string
is encoded in UTF-32, recodes it in place to ISO Latin-1,
and changes the type according to
.Xr ASN1_PRINTABLE_type 3 .
.Pp
.Fn ASN1_UNIVERSALSTRING_to_string
fails and leaves the
.Fa string
unchanged if its
.Xr ASN1_STRING_type 3
is not
.Dv V_ASN1_UNIVERSALSTRING ,
if its
.Xr ASN1_STRING_length 3
is not a multiple of four bytes,
or if any of its characters cannot be represented in ISO Latin-1.
.Pp
In case of success, the
.Xr ASN1_STRING_length 3
of the
.Fa string
is reduced by a factor of four.
.Sh RETURN VALUES
.Fn ASN1_UNIVERSALSTRING_to_string
returns 1 on success or 0 on failure.
.Sh SEE ALSO
.Xr ASN1_mbstring_copy 3 ,
.Xr ASN1_STRING_new 3 ,
.Xr ASN1_STRING_to_UTF8 3
.Sh HISTORY
.Fn ASN1_UNIVERSALSTRING_to_string
first appeared in SSLeay 0.8.0 and has been available since
.Ox 2.4 .