2009-10-17 20:46:52 +08:00
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=pod
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=head1 NAME
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X509_verify_cert - discover and verify X509 certificte chain
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=head1 SYNOPSIS
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#include <openssl/x509.h>
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int X509_verify_cert(X509_STORE_CTX *ctx);
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=head1 DESCRIPTION
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The X509_verify_cert() function attempts to discover and validate a
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2009-10-18 01:07:17 +08:00
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certificate chain based on parameters in B<ctx>. A complete description of
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the process is contained in the L<verify(1)|verify(1)> manual page.
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2009-10-17 20:46:52 +08:00
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=head1 RETURN VALUES
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If a complete chain can be built and validated this function returns 1,
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otherwise it return zero, in exceptional circumstances it can also
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return a negative code.
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If the function fails additional error information can be obtained by
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examining B<ctx> using, for example X509_STORE_CTX_get_error().
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=head1 NOTES
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Applications rarely call this function directly but it is used by
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OpenSSL internally for certificate validation, in both the S/MIME and
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SSL/TLS code.
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The negative return value from X509_verify_cert() can only occur if no
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certificate is set in B<ctx> (due to a programming error) or if a retry
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operation is requested during internal lookups (which never happens with
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standard lookup methods). It is however recommended that application check
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for <= 0 return value on error.
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=head1 BUGS
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This function uses the header B<x509.h> as opposed to most chain verification
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functiosn which use B<x509_vfy.h>.
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=head1 SEE ALSO
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L<X509_STORE_CTX_get_error(3)|X509_STORE_CTX_get_error(3)>
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=head1 HISTORY
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X509_verify_cert() is available in all versions of SSLeay and OpenSSL.
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=cut
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