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       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

	#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);

       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
       certificate x. The NID of the signing digest is written to *mdnid, the
       public key algorithm to *pknid, the effective security bits to *secbits
       and flag	details	to *flags. Any of the parameters can be	set to NULL if
       the information is not required.

       X509_SIG_INFO_get() and X509_SIG_INFO_set() get and set information
       about a signature in an X509_SIG_INFO structure.	They are only used by
       implementations of algorithms which need	to set custom signature
       information: most applications will never need to call them.

       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.

       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.

       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)

       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 2015-2020 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

1.1.1k				  2021-03-25		X509_GET0_SIGNATURE(3)


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