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X509_verify_cert
Section: OpenSSL (3) Updated: 2017-05-25 Index
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NAME
X509_verify_cert - discover and verify X509 certificte chain
SYNOPSIS
#include <openssl/x509.h>
int X509_verify_cert(X509_STORE_CTX *ctx);
DESCRIPTION
The X509_verify_cert() function attempts to discover and validate a
certificate chain based on parameters in ctx. A complete description of
the process is contained in the verify(1) manual page.
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 ctx using, for example X509_STORE_CTX_get_error().
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.
A negative return value from X509_verify_cert() can occur if it is invoked
incorrectly, such as with no certificate set in ctx, or when it is called
twice in succession without reinitialising ctx 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.
BUGS
This function uses the header x509.h as opposed to most chain verification
functiosn which use x509_vfy.h.
SEE ALSO
X509_STORE_CTX_get_error(3)
HISTORY
X509_verify_cert() is available in all versions of SSLeay and OpenSSL.
Index
- NAME
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- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUES
-
- NOTES
-
- BUGS
-
- SEE ALSO
-
- HISTORY
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