85 lines
2.5 KiB
Text
85 lines
2.5 KiB
Text
=pod
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=head1 NAME
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X509_get0_signature, X509_get_signature_nid, X509_get0_tbs_sigalg,
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X509_REQ_get0_signature, X509_REQ_get_signature_nid, X509_CRL_get0_signature,
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X509_CRL_get_signature_nid - signature information.
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=head1 SYNOPSIS
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#include <openssl/x509.h>
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void X509_get0_signature(ASN1_BIT_STRING **psig, X509_ALGOR **palg,
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const X509 *x);
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int X509_get_signature_nid(const X509 *x);
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X509_ALGOR *X509_get0_tbs_sigalg(X509 *x);
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void X509_REQ_get0_signature(ASN1_BIT_STRING **psig, X509_ALGOR **palg,
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const X509_REQ *crl);
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int X509_REQ_get_signature_nid(const X509_REQ *crl);
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void X509_CRL_get0_signature(ASN1_BIT_STRING **psig, X509_ALGOR **palg,
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const X509_CRL *crl);
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int X509_CRL_get_signature_nid(const X509_CRL *crl);
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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_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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=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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=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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=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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X509_get0_signature() and X509_get_signature_nid() were first added to
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OpenSSL 1.0.2.
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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 first added
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to OpenSSL 1.1.0.
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=cut
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