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143 lines
5.0 KiB
Plaintext
143 lines
5.0 KiB
Plaintext
=pod
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=head1 NAME
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X509_get0_signature, X509_REQ_set0_signature, X509_REQ_set1_signature_algo,
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X509_get_signature_nid, X509_get0_tbs_sigalg, X509_REQ_get0_signature,
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X509_REQ_get_signature_nid, X509_CRL_get0_signature, X509_CRL_get_signature_nid,
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X509_get_signature_info, X509_SIG_INFO_get, X509_SIG_INFO_set - signature information
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=head1 SYNOPSIS
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#include <openssl/x509.h>
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void X509_get0_signature(const ASN1_BIT_STRING **psig,
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const X509_ALGOR **palg,
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const X509 *x);
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void X509_REQ_set0_signature(X509_REQ *req, ASN1_BIT_STRING *psig);
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int X509_REQ_set1_signature_algo(X509_REQ *req, X509_ALGOR *palg);
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int X509_get_signature_nid(const X509 *x);
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const X509_ALGOR *X509_get0_tbs_sigalg(const X509 *x);
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void X509_REQ_get0_signature(const X509_REQ *crl,
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const ASN1_BIT_STRING **psig,
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const X509_ALGOR **palg);
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int X509_REQ_get_signature_nid(const X509_REQ *crl);
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void X509_CRL_get0_signature(const X509_CRL *crl,
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const ASN1_BIT_STRING **psig,
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const X509_ALGOR **palg);
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int X509_CRL_get_signature_nid(const X509_CRL *crl);
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int X509_get_signature_info(X509 *x, int *mdnid, int *pknid, int *secbits,
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uint32_t *flags);
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int X509_SIG_INFO_get(const X509_SIG_INFO *siginf, int *mdnid, int *pknid,
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int *secbits, uint32_t *flags);
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void X509_SIG_INFO_set(X509_SIG_INFO *siginf, int mdnid, int pknid,
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int secbits, uint32_t flags);
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=head1 DESCRIPTION
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X509_get0_signature() sets B<*psig> to the signature of B<x> and B<*palg>
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to the signature algorithm of B<x>. The values returned are internal
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pointers which B<MUST NOT> be freed up after the call.
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X509_set0_signature() and X509_REQ_set1_signature_algo() are the
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equivalent setters for the two values of X509_get0_signature().
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X509_get0_tbs_sigalg() returns the signature algorithm in the signed
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portion of B<x>.
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X509_get_signature_nid() returns the NID corresponding to the signature
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algorithm of B<x>.
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X509_REQ_get0_signature(), X509_REQ_get_signature_nid()
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X509_CRL_get0_signature() and X509_CRL_get_signature_nid() perform the
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same function for certificate requests and CRLs.
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X509_get_signature_info() retrieves information about the signature of
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certificate B<x>. The NID of the signing digest is written to B<*mdnid>,
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the public key algorithm to B<*pknid>, the effective security bits to
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B<*secbits> and flag details to B<*flags>. Any of the parameters can
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be set to B<NULL> if the information is not required.
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X509_SIG_INFO_get() and X509_SIG_INFO_set() get and set information
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about a signature in an B<X509_SIG_INFO> structure. They are only
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used by implementations of algorithms which need to set custom
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signature information: most applications will never need to call
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them.
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=head1 NOTES
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These functions provide lower level access to signatures in certificates
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where an application wishes to analyse or generate a signature in a form
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where X509_sign() et al is not appropriate (for example a non standard
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or unsupported format).
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The security bits returned by X509_get_signature_info() refers to information
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available from the certificate signature (such as the signing digest). In some
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cases the actual security of the signature is less because the signing
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key is less secure: for example a certificate signed using SHA-512 and a
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1024 bit RSA key.
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=head1 RETURN VALUES
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X509_get_signature_nid(), X509_REQ_get_signature_nid() and
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X509_CRL_get_signature_nid() return a NID.
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X509_get0_signature(), X509_REQ_get0_signature() and
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X509_CRL_get0_signature() do not return values.
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X509_get_signature_info() returns 1 if the signature information
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returned is valid or 0 if the information is not available (e.g.
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unknown algorithms or malformed parameters).
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X509_REQ_set1_signature_algo() returns 0 on success; or 1 on an
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error (e.g. null ALGO pointer). X509_REQ_set0_signature does
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not return an error value.
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=head1 SEE ALSO
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L<d2i_X509(3)>,
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L<ERR_get_error(3)>,
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L<X509_CRL_get0_by_serial(3)>,
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L<X509_get_ext_d2i(3)>,
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L<X509_get_extension_flags(3)>,
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L<X509_get_pubkey(3)>,
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L<X509_get_subject_name(3)>,
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L<X509_get_version(3)>,
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L<X509_NAME_add_entry_by_txt(3)>,
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L<X509_NAME_ENTRY_get_object(3)>,
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L<X509_NAME_get_index_by_NID(3)>,
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L<X509_NAME_print_ex(3)>,
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L<X509_new(3)>,
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L<X509_sign(3)>,
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L<X509V3_get_d2i(3)>,
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L<X509_verify_cert(3)>
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=head1 HISTORY
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The
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X509_get0_signature() and X509_get_signature_nid() functions were
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added in OpenSSL 1.0.2.
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The
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X509_REQ_get0_signature(), X509_REQ_get_signature_nid(),
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X509_CRL_get0_signature() and X509_CRL_get_signature_nid() were
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added in OpenSSL 1.1.0.
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The X509_REQ_set0_signature() and X509_REQ_set1_signature_algo()
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were added in OpenSSL 1.1.1e.
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=head1 COPYRIGHT
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Copyright 2015-2021 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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