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1 .\" $OpenBSD: X509_verify_cert.3,v 1.7 2018/03/27 17:35:50 schwarze Exp $
2 .\" OpenSSL 99d63d46 Oct 26 13:56:48 2016 -0400
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51 .Dd $Mdocdate: March 27 2018 $
52 .Dt X509_VERIFY_CERT 3
53 .Os
54 .Sh NAME
55 .Nm X509_verify_cert
56 .Nd discover and verify X509 certificate chain
57 .Sh SYNOPSIS
58 .In openssl/x509.h
59 .Ft int
60 .Fo X509_verify_cert
61 .Fa "X509_STORE_CTX *ctx"
62 .Fc
63 .Sh DESCRIPTION
64 The
65 .Fn X509_verify_cert
66 function attempts to discover and validate a certificate chain based on
67 parameters in
68 .Fa ctx .
69 .Pp
70 Applications rarely call this function directly, but it is used by
71 OpenSSL internally for certificate validation, in both the S/MIME and
72 SSL/TLS code.
73 .Sh RETURN VALUES
74 If a complete chain can be built and validated this function returns 1,
75 otherwise it returns a value <= 0 indicating failure.
76 .Pp
77 Additional error information can be obtained by examining
78 .Fa ctx ,
79 using
80 .Xr X509_STORE_CTX_get_error 3 .
81 .Sh SEE ALSO
82 .Xr openssl 1 ,
83 .Xr X509_STORE_CTX_get_error 3
84 .Sh HISTORY
85 .Fn X509_verify_cert
86 first appeared in SSLeay 0.8.0 and has been available since
87 .Ox 2.4 .
88 .Sh BUGS
89 This function uses the header
90 .In openssl/x509.h
91 as opposed to most chain verification functions which use
92 .In openssl/x509_vfy.h .