mirror of
https://github.com/openssl/openssl.git
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92 lines
3.0 KiB
Plaintext
92 lines
3.0 KiB
Plaintext
=pod
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=head1 NAME
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X509_digest,
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X509_digest_sig,
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X509_CRL_digest,
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X509_pubkey_digest,
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X509_NAME_digest,
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X509_REQ_digest,
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PKCS7_ISSUER_AND_SERIAL_digest
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- get digest of various objects
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=head1 SYNOPSIS
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#include <openssl/x509.h>
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int X509_digest(const X509 *data, const EVP_MD *type, unsigned char *md,
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unsigned int *len);
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ASN1_OCTET_STRING *X509_digest_sig(const X509 *cert,
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EVP_MD **md_used, int *md_is_fallback);
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int X509_CRL_digest(const X509_CRL *data, const EVP_MD *type, unsigned char *md,
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unsigned int *len);
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int X509_pubkey_digest(const X509 *data, const EVP_MD *type,
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unsigned char *md, unsigned int *len);
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int X509_REQ_digest(const X509_REQ *data, const EVP_MD *type,
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unsigned char *md, unsigned int *len);
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int X509_NAME_digest(const X509_NAME *data, const EVP_MD *type,
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unsigned char *md, unsigned int *len);
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#include <openssl/pkcs7.h>
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int PKCS7_ISSUER_AND_SERIAL_digest(PKCS7_ISSUER_AND_SERIAL *data,
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const EVP_MD *type, unsigned char *md,
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unsigned int *len);
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=head1 DESCRIPTION
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X509_digest_sig() calculates a digest of the given certificate I<cert>
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using the same hash algorithm as in its signature, if the digest
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is an integral part of the certificate signature algorithm identifier.
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Otherwise, a fallback hash algorithm is determined as follows:
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SHA512 if the signature algorithm is ED25519,
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SHAKE256 if it is ED448, otherwise SHA256.
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The output parameters are assigned as follows.
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Unless I<md_used> is NULL, the hash algorithm used is provided
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in I<*md_used> and must be freed by the caller (if it is not NULL).
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Unless I<md_is_fallback> is NULL,
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the I<*md_is_fallback> is set to 1 if the hash algorithm used is a fallback,
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otherwise to 0.
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X509_pubkey_digest() returns a digest of the DER representation of the public
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key in the specified X509 I<data> object.
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All other functions described here return a digest of the DER representation
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of their entire I<data> objects.
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The I<type> parameter specifies the digest to
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be used, such as EVP_sha1(). The I<md> is a pointer to the buffer where the
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digest will be copied and is assumed to be large enough; the constant
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B<EVP_MAX_MD_SIZE> is suggested. The I<len> parameter, if not NULL, points
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to a place where the digest size will be stored.
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=head1 RETURN VALUES
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X509_digest_sig() returns an ASN1_OCTET_STRING pointer on success, else NULL.
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All other functions described here return 1 for success and 0 for failure.
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=head1 SEE ALSO
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L<EVP_sha1(3)>
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=head1 HISTORY
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The X509_digest_sig() function was added in OpenSSL 3.0.
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=head1 COPYRIGHT
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Copyright 2017-2022 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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