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| 1 =pod |
| 2 |
| 3 =head1 NAME |
| 4 |
| 5 X509_verify_cert - discover and verify X509 certificte chain |
| 6 |
| 7 =head1 SYNOPSIS |
| 8 |
| 9 #include <openssl/x509.h> |
| 10 |
| 11 int X509_verify_cert(X509_STORE_CTX *ctx); |
| 12 |
| 13 =head1 DESCRIPTION |
| 14 |
| 15 The X509_verify_cert() function attempts to discover and validate a |
| 16 certificate chain based on parameters in B<ctx>. A complete description of |
| 17 the process is contained in the L<verify(1)|verify(1)> manual page. |
| 18 |
| 19 =head1 RETURN VALUES |
| 20 |
| 21 If a complete chain can be built and validated this function returns 1, |
| 22 otherwise it return zero, in exceptional circumstances it can also |
| 23 return a negative code. |
| 24 |
| 25 If the function fails additional error information can be obtained by |
| 26 examining B<ctx> using, for example X509_STORE_CTX_get_error(). |
| 27 |
| 28 =head1 NOTES |
| 29 |
| 30 Applications rarely call this function directly but it is used by |
| 31 OpenSSL internally for certificate validation, in both the S/MIME and |
| 32 SSL/TLS code. |
| 33 |
| 34 The negative return value from X509_verify_cert() can only occur if no |
| 35 certificate is set in B<ctx> (due to a programming error) or if a retry |
| 36 operation is requested during internal lookups (which never happens with |
| 37 standard lookup methods). It is however recommended that application check |
| 38 for <= 0 return value on error. |
| 39 |
| 40 =head1 BUGS |
| 41 |
| 42 This function uses the header B<x509.h> as opposed to most chain verification |
| 43 functiosn which use B<x509_vfy.h>. |
| 44 |
| 45 =head1 SEE ALSO |
| 46 |
| 47 L<X509_STORE_CTX_get_error(3)|X509_STORE_CTX_get_error(3)> |
| 48 |
| 49 =head1 HISTORY |
| 50 |
| 51 X509_verify_cert() is available in all versions of SSLeay and OpenSSL. |
| 52 |
| 53 =cut |
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