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X509_verify_cert.3
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" X509_verify_cert \- discover and verify X509 certificate chain .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/x509.h> \& \& int X509_verify_cert(X509_STORE_CTX *ctx); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" The \fBX509_verify_cert()\fR function attempts to discover and validate a certificate chain based on parameters in \fBctx\fR. A complete description of the process is contained in the \fBverify\fR\|(1) manual page. .SH "RETURN VALUES" .IX Header "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. .PP If the function fails additional error information can be obtained by examining \fBctx\fR using, for example \fBX509_STORE_CTX_get_error()\fR. .SH "NOTES" .IX Header "NOTES" Applications rarely call this function directly but it is used by OpenSSL internally for certificate validation, in both the S/MIME and \&\s-1SSL/TLS\s0 code. .PP A negative return value from \fBX509_verify_cert()\fR can occur if it is invoked incorrectly, such as with no certificate set in \fBctx\fR, or when it is called twice in succession without reinitialising \fBctx\fR for the second call. A negative return value can also happen due to internal resource problems or if a retry operation is requested during internal lookups (which never happens with standard lookup methods). Applications must check for <= 0 return value on error. .SH "BUGS" .IX Header "BUGS" This function uses the header \fBx509.h\fR as opposed to most chain verification functions which use \fBx509_vfy.h\fR. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBX509_STORE_CTX_get_error\fR\|(3) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2009\-2016 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.
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