NAME
X509_get0_signature,
X509_REQ_get0_signature,
X509_CRL_get0_signature,
X509_get0_tbs_sigalg,
X509_get_signature_type,
X509_get_signature_nid,
X509_REQ_get_signature_nid,
X509_CRL_get_signature_nid —
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_get0_signature(const X509_REQ
*req, const ASN1_BIT_STRING **psig,
const X509_ALGOR **palg);
void
X509_CRL_get0_signature(const X509_CRL
*crl, const ASN1_BIT_STRING **psig,
const X509_ALGOR **palg);
const X509_ALGOR *
X509_get0_tbs_sigalg(const X509
*x);
int
X509_get_signature_type(const X509
*x);
int
X509_get_signature_nid(const X509
*x);
int
X509_REQ_get_signature_nid(const
X509_REQ *req);
int
X509_CRL_get_signature_nid(const
X509_CRL *crl);
DESCRIPTION
X509_get0_signature(),
X509_REQ_get0_signature(),
and
X509_CRL_get0_signature()
set *psig to the signature and
*palg to the signature algorithm of
x, req, or
crl, respectively.
X509_get0_tbs_sigalg()
returns the signature algorithm in the signed portion of
x. The values returned are internal pointers that must
not be freed by the caller.
X509_get_signature_type()
returns the base NID corresponding to the signature algorithm of
x just like
EVP_PKEY_base_id(3) does.
X509_get_signature_nid(),
X509_REQ_get_signature_nid(),
and
X509_CRL_get_signature_nid()
return the NID corresponding to the signature algorithm of
x, req, or
crl, respectively, just like
EVP_PKEY_id(3) does.
These functions provide lower level access to the signature for cases where an application wishes to analyse or generate a signature in a form where X509_sign(3) is not appropriate, for example in a non-standard or unsupported format.
SEE ALSO
EVP_PKEY_base_id(3), OBJ_obj2nid(3), X509_ALGOR_new(3), X509_CRL_get0_by_serial(3), X509_CRL_new(3), X509_get_pubkey(3), X509_get_subject_name(3), X509_get_version(3), X509_new(3), X509_REQ_new(3), X509_sign(3), X509_signature_dump(3), X509_verify_cert(3)
HISTORY
X509_get_signature_type() first appeared
in SSLeay 0.8.0 and has been available since OpenBSD
2.4.
X509_get0_signature() and
X509_get_signature_nid() first appeared in OpenSSL
1.0.2. X509_REQ_get0_signature(),
X509_CRL_get0_signature(),
X509_get0_tbs_sigalg(),
X509_REQ_get_signature_nid(), and
X509_CRL_get_signature_nid() first appeared in
OpenSSL 1.1.0. All these functions have been available since
OpenBSD 6.3.