Android_verify/third_party/android-libs/share/man/man3/X509_digest.3ossl

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.\" ========================================================================
.\"
.IX Title "X509_DIGEST 3ossl"
.TH X509_DIGEST 3ossl "2024-09-03" "3.3.2" "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_digest_sig,
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);
\& ASN1_OCTET_STRING *X509_digest_sig(const X509 *cert,
\&                                    EVP_MD **md_used, int *md_is_fallback);
\&
\& 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"
\&\fBX509_digest_sig()\fR calculates a digest of the given certificate \fIcert\fR
using the same hash algorithm as in its signature, if the digest
is an integral part of the certificate signature algorithm identifier.
Otherwise, a fallback hash algorithm is determined as follows:
\&\s-1SHA512\s0 if the signature algorithm is \s-1ED25519,
SHAKE256\s0 if it is \s-1ED448,\s0 otherwise \s-1SHA256.\s0
The output parameters are assigned as follows.
Unless \fImd_used\fR is \s-1NULL,\s0 the hash algorithm used is provided
in \fI*md_used\fR and must be freed by the caller (if it is not \s-1NULL\s0).
Unless \fImd_is_fallback\fR is \s-1NULL,\s0
the \fI*md_is_fallback\fR is set to 1 if the hash algorithm used is a fallback,
otherwise to 0.
.PP
\&\fBX509_pubkey_digest()\fR returns a digest of the \s-1DER\s0 representation of the public
key in the specified X509 \fIdata\fR object.
.PP
All other functions described here return a digest of the \s-1DER\s0 representation
of their entire \fIdata\fR objects.
.PP
The \fItype\fR parameter specifies the digest to
be used, such as \fBEVP_sha1()\fR. The \fImd\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 \fIlen\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"
\&\fBX509_digest_sig()\fR returns an \s-1ASN1_OCTET_STRING\s0 pointer on success, else \s-1NULL.\s0
.PP
All other functions described here return 1 for success and 0 for failure.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBEVP_sha1\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
The \fBX509_digest_sig()\fR function was added in OpenSSL 3.0.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2017\-2022 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (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>.