Manual page for X509_verify_cert()

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