X509_VERIFY_CERT(3)        Library Functions Manual        X509_VERIFY_CERT(3)

NAME
     X509_verify_cert - discover and verify X509 certificate chain

SYNOPSIS
     library "libcrypto"
     #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.

     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.

RETURN VALUES
     If a complete chain can be built and validated this function returns 1,
     otherwise it returns a value <= 0 indicating failure.

     Additional error information can be obtained by examining ctx, using
     X509_STORE_CTX_get_error(3).

SEE ALSO
     openssl(1), X509_STORE_CTX_get_error(3), X509_STORE_CTX_new(3)

HISTORY
     X509_verify_cert() first appeared in SSLeay 0.8.0 and has been available
     since OpenBSD 2.4.

BUGS
     This function uses the header <openssl/x509.h> as opposed to most chain
     verification functions which use <openssl/x509_vfy.h>.

Linux 6.12.107+deb13-amd64       June 8, 2025       Linux 6.12.107+deb13-amd64