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.\" ========================================================================
.\"
.IX Title "X509_DIGEST 3"
.TH X509_DIGEST 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
X509_digest, X509_CRL_digest, X509_pubkey_digest, X509_NAME_digest, X509_REQ_digest, PKCS7_ISSUER_AND_SERIAL_digest \&\- get digest of various objects
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/x509.h>
\&
\& int X509_digest(const X509 *data, const EVP_MD *type, unsigned char *md,
\&                 unsigned int *len);
\&
\& int X509_CRL_digest(const X509_CRL *data, const EVP_MD *type, unsigned char *md,
\&                     unsigned int *len);
\&
\& int X509_pubkey_digest(const X509 *data, const EVP_MD *type,
\&                        unsigned char *md, unsigned int *len);
\&
\& int X509_REQ_digest(const X509_REQ *data, const EVP_MD *type,
\&                     unsigned char *md, unsigned int *len);
\&
\& int X509_NAME_digest(const X509_NAME *data, const EVP_MD *type,
\&                      unsigned char *md, unsigned int *len);
\&
\& #include <openssl/pkcs7.h>
\&
\& int PKCS7_ISSUER_AND_SERIAL_digest(PKCS7_ISSUER_AND_SERIAL *data,
\&                                    const EVP_MD *type, unsigned char *md,
\&                                    unsigned int *len);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fIX509_pubkey_digest()\fR returns a digest of the \s-1DER\s0 representation of the public
key in the specified X509 \fBdata\fR object.
All other functions described here return a digest of the \s-1DER\s0 representation
of their entire \fBdata\fR objects.
.PP
The \fBtype\fR parameter specifies the digest to
be used, such as \fIEVP_sha1()\fR. The \fBmd\fR is a pointer to the buffer where the
digest will be copied and is assumed to be large enough; the constant
\&\fB\s-1EVP_MAX_MD_SIZE\s0\fR is suggested. The \fBlen\fR parameter, if not \s-1NULL,\s0 points
to a place where the digest size will be stored.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
All functions described here return 1 for success and 0 for failure.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIEVP_sha1\fR\|(3)
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2017\-2018 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.

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