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X509_GET0_SIGNATURE(3ossl) OpenSSL X509_GET0_SIGNATURE(3ossl)
NAME
X509_get0_signature, X509_REQ_set0_signature,
X509_REQ_set1_signature_algo, X509_get_signature_nid,
X509_get0_tbs_sigalg, X509_REQ_get0_signature,
X509_REQ_get_signature_nid, X509_CRL_get0_signature,
X509_CRL_get_signature_nid, X509_get_signature_info, X509_SIG_INFO_get,
X509_SIG_INFO_set - signature information
SYNOPSIS
#include <openssl/x509.h>
void X509_get0_signature(const ASN1_BIT_STRING **psig,
const X509_ALGOR **palg,
const X509 *x);
void X509_REQ_set0_signature(X509_REQ *req, ASN1_BIT_STRING *psig);
int X509_REQ_set1_signature_algo(X509_REQ *req, X509_ALGOR *palg);
int X509_get_signature_nid(const X509 *x);
const X509_ALGOR *X509_get0_tbs_sigalg(const X509 *x);
void X509_REQ_get0_signature(const X509_REQ *crl,
const ASN1_BIT_STRING **psig,
const X509_ALGOR **palg);
int X509_REQ_get_signature_nid(const X509_REQ *crl);
void X509_CRL_get0_signature(const X509_CRL *crl,
const ASN1_BIT_STRING **psig,
const X509_ALGOR **palg);
int X509_CRL_get_signature_nid(const X509_CRL *crl);
int X509_get_signature_info(X509 *x, int *mdnid, int *pknid, int *secbits,
uint32_t *flags);
int X509_SIG_INFO_get(const X509_SIG_INFO *siginf, int *mdnid, int *pknid,
int *secbits, uint32_t *flags);
void X509_SIG_INFO_set(X509_SIG_INFO *siginf, int mdnid, int pknid,
int secbits, uint32_t flags);
DESCRIPTION
X509_get0_signature() sets *psig to the signature of x and *palg to the
signature algorithm of x. The values returned are internal pointers
which MUST NOT be freed up after the call.
X509_set0_signature() and X509_REQ_set1_signature_algo() are the
equivalent setters for the two values of X509_get0_signature().
X509_get0_tbs_sigalg() returns the signature algorithm in the signed
portion of x.
X509_get_signature_nid() returns the NID corresponding to the signature
algorithm of x.
X509_REQ_get0_signature(), X509_REQ_get_signature_nid()
X509_CRL_get0_signature() and X509_CRL_get_signature_nid() perform the
same function for certificate requests and CRLs.
X509_get_signature_info() retrieves information about the signature of
implementations of algorithms which need to set custom signature
information: most applications will never need to call them.
NOTES
These functions provide lower level access to signatures in
certificates where an application wishes to analyse or generate a
signature in a form where X509_sign() et al is not appropriate (for
example a non standard or unsupported format).
The security bits returned by X509_get_signature_info() refers to
information available from the certificate signature (such as the
signing digest). In some cases the actual security of the signature is
less because the signing key is less secure: for example a certificate
signed using SHA-512 and a 1024 bit RSA key.
RETURN VALUES
X509_get_signature_nid(), X509_REQ_get_signature_nid() and
X509_CRL_get_signature_nid() return a NID.
X509_get0_signature(), X509_REQ_get0_signature() and
X509_CRL_get0_signature() do not return values.
X509_get_signature_info() returns 1 if the signature information
returned is valid or 0 if the information is not available (e.g.
unknown algorithms or malformed parameters).
X509_REQ_set1_signature_algo() returns 0 on success; or 1 on an error
(e.g. null ALGO pointer). X509_REQ_set0_signature does not return an
error value.
SEE ALSO
d2i_X509(3), ERR_get_error(3), X509_CRL_get0_by_serial(3),
X509_get_ext_d2i(3), X509_get_extension_flags(3), X509_get_pubkey(3),
X509_get_subject_name(3), X509_get_version(3),
X509_NAME_add_entry_by_txt(3), X509_NAME_ENTRY_get_object(3),
X509_NAME_get_index_by_NID(3), X509_NAME_print_ex(3), X509_new(3),
X509_sign(3), X509V3_get_d2i(3), X509_verify_cert(3)
HISTORY
The X509_get0_signature() and X509_get_signature_nid() functions were
added in OpenSSL 1.0.2.
The X509_REQ_get0_signature(), X509_REQ_get_signature_nid(),
X509_CRL_get0_signature() and X509_CRL_get_signature_nid() were added
in OpenSSL 1.1.0.
The X509_REQ_set0_signature() and X509_REQ_set1_signature_algo() were
added in OpenSSL 1.1.1e.
COPYRIGHT
Copyright 2015-2021 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the Apache License 2.0 (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>.
3.0.11 2023-09-19 X509_GET0_SIGNATURE(3ossl)