.\" $OpenBSD: X509_ocspid_print.3,v 1.1 2021/08/06 21:45:55 schwarze Exp $
.\"
.\" Copyright (c) 2021 Ingo Schwarze <schwarze@openbsd.org>
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.Dd $Mdocdate: August 6 2021 $
.Dt X509_OCSPID_PRINT 3
.Os
.Sh NAME
.Nm X509_ocspid_print
.Nd pretty-print hashes of subject name and public key
.Sh SYNOPSIS
.In openssl/x509.h
.Ft int
.Fo X509_ocspid_print
.Fa "BIO *bio"
.Fa "X509 *issuer"
.Fc
.Sh DESCRIPTION
.Fn X509_ocspid_print
produces human-readable output to
.Fa bio
containing hexadecimal representations of SHA-1 hashes of the
DER-encoded forms of the subject name and the public key of the
.Fa issuer
certificate, as these hashes appear in OCSP requests.
.Sh RETURN VALUES
.Fn X509_ocspid_print
returns 1 for success or 0 for failure.
.Sh EXAMPLES
This function is used by the
.Fl ocspid
flag of the
.Xr openssl 1
.Cm x509
command.
.Sh SEE ALSO
.Xr EVP_sha1 3 ,
.Xr i2d_X509_NAME 3 ,
.Xr OCSP_cert_to_id 3 ,
.Xr OCSP_REQUEST_new 3 ,
.Xr X509_get_pubkey 3 ,
.Xr X509_get_subject_name 3
.Sh HISTORY
.Fn X509_ocspid_print
first appeared in OpenSSL 0.9.7 and has been available since
.Ox 3.2 .