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

SYNOPSIS

        #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);

DESCRIPTION

       X509_pubkey_digest() returns a digest of the DER representation of the public key in the
       specified X509 data object.  All other functions described here return a digest of the DER
       representation of their entire data objects.

       The type parameter specifies the digest to be used, such as EVP_sha1(). The md is a
       pointer to the buffer where the digest will be copied and is assumed to be large enough;
       the constant EVP_MAX_MD_SIZE is suggested. The len parameter, if not NULL, points to a
       place where the digest size will be stored.

RETURN VALUES

       All functions described here return 1 for success and 0 for failure.

SEE ALSO

       EVP_sha1(3)

COPYRIGHT

       Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the OpenSSL license (the "License").  You may not use this file except in
       compliance with the License.  You can obtain a copy in the file LICENSE in the source
       distribution or at <https://www.openssl.org/source/license.html>.