.\" $OpenBSD: ASN1_buf_print.3,v 1.1 2022/12/14 20:27:28 schwarze Exp $
.\"
.\" Copyright (c) 2022 Ingo Schwarze <schwarze@openbsd.org>
.\"
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.Dd $Mdocdate: December 14 2022 $
.Dt ASN1_BUF_PRINT 3
.Os
.Sh NAME
.Nm ASN1_buf_print
.Nd pretty-print a byte array
.Sh SYNOPSIS
.In openssl/asn1.h
.Ft int
.Fo ASN1_buf_print
.Fa "BIO *bio_out"
.Fa "const unsigned char *buf"
.Fa "size_t buflen"
.Fa "int indent"
.Fc
.Sh DESCRIPTION
.Fn ASN1_buf_print
prints a hexadecimal representation of the first
.Fa buflen
bytes from
.Fa buf
to
.Fa bio_out .
Despite its name and the header file,
this function has nothing to do with ASN.1.
.Pp
Each byte from
.Fa buf
is represented by two lower-case hexadecimal digits.
Fifteen pairs of digits are printed per output line,
or at most fifteen on the last output line.
Every output line including the last one ends with a newline character.
Every pair except the last is followed by a colon
.Pq Sq \&: .
If
.Fa indent
is greater than zero,
every output line is indented by
.Fa indent
space characters, but not by more than 64 characters.
.Sh RETURN VALUES
.Fn ASN1_buf_print
returns 1 if successful or 0 if printing fails.
.Sh SEE ALSO
.Xr ASN1_bn_print 3 ,
.Xr ASN1_item_print 3 ,
.Xr ASN1_STRING_print_ex 3 ,
.Xr ASN1_TIME_print 3 ,
.Xr BIO_new 3 ,
.Xr BIO_write 3
.Sh HISTORY
.Fn ASN1_buf_print
first appeared in OpenSSL 1.1.0 and has been available since
.Ox 7.3 .