1X509_VERIFY(3ossl)                  OpenSSL                 X509_VERIFY(3ossl)
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NAME

6       X509_verify, X509_self_signed, X509_REQ_verify_ex, X509_REQ_verify,
7       X509_CRL_verify - verify certificate, certificate request, or CRL
8       signature
9

SYNOPSIS

11        #include <openssl/x509.h>
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13        int X509_verify(X509 *x, EVP_PKEY *pkey);
14        int X509_self_signed(X509 *cert, int verify_signature);
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16        int X509_REQ_verify_ex(X509_REQ *a, EVP_PKEY *pkey, OSSL_LIB_CTX *libctx,
17                               const char *propq);
18        int X509_REQ_verify(X509_REQ *a, EVP_PKEY *r);
19        int X509_CRL_verify(X509_CRL *a, EVP_PKEY *r);
20

DESCRIPTION

22       X509_verify() verifies the signature of certificate x using public key
23       pkey. Only the signature is checked: no other checks (such as
24       certificate chain validity) are performed.
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26       X509_self_signed() checks whether certificate cert is self-signed.  For
27       success the issuer and subject names must match, the components of the
28       authority key identifier (if present) must match the subject key
29       identifier etc.  The signature itself is actually verified only if
30       verify_signature is 1, as for explicitly trusted certificates this
31       verification is not worth the effort.
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33       X509_REQ_verify_ex(), X509_REQ_verify() and X509_CRL_verify() verify
34       the signatures of certificate requests and CRLs, respectively.
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RETURN VALUES

37       X509_verify(), X509_REQ_verify_ex(), X509_REQ_verify() and
38       X509_CRL_verify() return 1 if the signature is valid and 0 if the
39       signature check fails.  If the signature could not be checked at all
40       because it was ill-formed, the certificate or the request was not
41       complete or some other error occurred then -1 is returned.
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43       X509_self_signed() returns the same values but also returns 1 if all
44       respective fields match and verify_signature is 0.
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SEE ALSO

47       d2i_X509(3), ERR_get_error(3), X509_CRL_get0_by_serial(3),
48       X509_get0_signature(3), X509_get_ext_d2i(3),
49       X509_get_extension_flags(3), X509_get_pubkey(3),
50       X509_get_subject_name(3), X509_get_version(3),
51       X509_NAME_ENTRY_get_object(3), X509_NAME_get_index_by_NID(3),
52       X509_NAME_print_ex(3), X509V3_get_d2i(3), X509_verify_cert(3),
53       OSSL_LIB_CTX(3)
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HISTORY

56       The X509_verify(), X509_REQ_verify(), and X509_CRL_verify() functions
57       are available in all versions of OpenSSL.
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59       X509_REQ_verify_ex(), and X509_self_signed() were added in OpenSSL 3.0.
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62       Copyright 2015-2021 The OpenSSL Project Authors. All Rights Reserved.
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64       Licensed under the Apache License 2.0 (the "License").  You may not use
65       this file except in compliance with the License.  You can obtain a copy
66       in the file LICENSE in the source distribution or at
67       <https://www.openssl.org/source/license.html>.
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713.0.9                             2023-07-27                X509_VERIFY(3ossl)
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