.\" $OpenBSD: X509_signature_dump.3,v 1.2 2021/12/18 17:47:45 schwarze Exp $
.\"
.\" Copyright (c) 2021 Ingo Schwarze <schwarze@openbsd.org>
.\"
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.\" copyright notice and this permission notice appear in all copies.
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.Dd $Mdocdate: December 18 2021 $
.Dt X509_SIGNATURE_DUMP 3
.Os
.Sh NAME
.Nm X509_signature_dump ,
.Nm X509_signature_print
.Nd pretty-print ASN.1 strings
.Sh SYNOPSIS
.In openssl/x509.h
.Ft int
.Fo X509_signature_dump
.Fa "BIO *bio"
.Fa "const ASN1_STRING *signature"
.Fa "int indent"
.Fc
.Ft int
.Fo X509_signature_print
.Fa "BIO *bio"
.Fa "const X509_ALGOR *algorithm"
.Fa "const ASN1_STRING *signature"
.Fc
.Sh DESCRIPTION
.Fn X509_signature_dump
writes the data bytes contained in the
.Fa signature
to
.Fa bio
in hexadecimal format with colons between bytes,
18 bytes per output line, each line indented with
.Fa indent
space characters.
.Pp
.Fn X509_signature_print
writes the name of the signature
.Fa algorithm ,
or, if no name for it is known, its object identifier (OID) to
.Fa bio
using
.Xr i2a_ASN1_OBJECT 3 .
After that, if a method object for the algorithm can be retrieved with
.Xr EVP_PKEY_asn1_find 3
and if that object defines a printing method, that printing method is
used to print the
.Fa signature .
Otherwise, unless the
.Fa signature
is
.Dv NULL ,
it is printed using
.Fn X509_signature_dump .
.Sh RETURN VALUES
These functions return 1 on success or 0 on failure.
They fail and return as soon as any write operation fails.
.Sh SEE ALSO
.Xr ASN1_STRING_new 3 ,
.Xr ASN1_STRING_print_ex 3 ,
.Xr BIO_new 3 ,
.Xr EVP_PKEY_asn1_new 3 ,
.Xr OBJ_find_sigid_algs 3 ,
.Xr X509_ALGOR_new 3 ,
.Xr X509_get0_signature 3
.Sh HISTORY
.Fn X509_signature_print
first appeared in OpenSSL 0.9.7 and has been available since
.Ox 3.2 .
.Pp
.Fn X509_signature_dump
first appeared in OpenSSL 1.0.1 and has been available since
.Ox 5.3 .