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- =pod
- =head1 NAME
- X509_verify_ex, X509_verify, X509_self_signed,
- X509_REQ_verify_ex, X509_REQ_verify,
- X509_CRL_verify -
- verify certificate, certificate request, or CRL signature
- =head1 SYNOPSIS
- #include <openssl/x509.h>
- int X509_verify_ex(X509 *x, EVP_PKEY *pkey,
- OPENSSL_CTX *libctx, const char *propq);
- int X509_verify(X509 *x, EVP_PKEY *pkey);
- int X509_self_signed(X509 *cert, int verify_signature);
- int X509_REQ_verify_ex(X509_REQ *a, EVP_PKEY *pkey,
- OPENSSL_CTX *libctx, const char *propq);
- int X509_REQ_verify(X509_REQ *a, EVP_PKEY *r);
- int X509_CRL_verify(X509_CRL *a, EVP_PKEY *r);
- =head1 DESCRIPTION
- X509_verify_ex() verifies the signature of certificate I<x> using public key
- I<pkey>. Any cryptographic algorithms required for the verification are fetched
- using the library context I<libctx> and the property query string I<propq>.
- Only the signature is checked:
- no other checks (such as certificate chain validity) are performed.
- X509_verify() is the same as X509_verify_ex() except that the default library
- context and property query string are used.
- X509_self_signed() checks whether a certificate is self-signed.
- For success the issuer and subject names must match, the components of the
- authority key identifier (if present) must match the subject key identifier etc.
- The signature itself is actually verified only if B<verify_signature> is 1, as
- for explicitly trusted certificates this verification is not worth the effort.
- X509_REQ_verify_ex(), X509_REQ_verify() and X509_CRL_verify()
- verify the signatures of certificate requests and CRLs, respectively.
- =head1 RETURN VALUES
- X509_verify_ex(), X509_verify(),
- X509_REQ_verify_ex(), X509_REQ_verify() and X509_CRL_verify()
- return 1 if the signature is valid and 0 if the signature check fails.
- If the signature could not be checked at all because it was ill-formed
- or some other error occurred then -1 is returned.
- X509_self_signed() returns the same values but also returns 1
- if all respective fields match and B<verify_signature> is 0.
- =head1 SEE ALSO
- L<d2i_X509(3)>,
- L<ERR_get_error(3)>,
- L<X509_CRL_get0_by_serial(3)>,
- L<X509_get0_signature(3)>,
- L<X509_get_ext_d2i(3)>,
- L<X509_get_extension_flags(3)>,
- L<X509_get_pubkey(3)>,
- L<X509_get_subject_name(3)>,
- L<X509_get_version(3)>,
- L<X509_NAME_ENTRY_get_object(3)>,
- L<X509_NAME_get_index_by_NID(3)>,
- L<X509_NAME_print_ex(3)>,
- L<X509V3_get_d2i(3)>,
- L<X509_verify_cert(3)>,
- L<OPENSSL_CTX(3)>
- =head1 HISTORY
- The X509_verify(), X509_REQ_verify(), and X509_CRL_verify()
- functions are available in all versions of OpenSSL.
- X509_verify_ex(), X509_REQ_verify_ex(), and X509_self_signed()
- were added in OpenSSL 3.0.
- =head1 COPYRIGHT
- Copyright 2015-2020 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
- L<https://www.openssl.org/source/license.html>.
- =cut
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