X509_verify_cert (3)
Leading comments
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NAME
X509_verify_cert - discover and verify X509 certificte chainSYNOPSIS
#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 andSSL/TLS
code.
The negative return value from X509_verify_cert() can only occur if no certificate is set in ctx (due to a programming error); if X509_verify_cert() twice without reinitialising ctx in between; 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.