openssl_x509_fingerprint Calculates the fingerprint, or digest, of a given X.509 certificate &reftitle.description; stringopenssl_x509_fingerprint mixedx509 stringhash_algorithm"sha1" boolraw_output&false; openssl_x509_fingerprint returns the digest of x509 as a string. &reftitle.parameters; &openssl.param.x509; hash_algorithm The digest method or hash algorithm to use, e.g. "sha256", one of openssl_get_md_methods. raw_output When set to &true;, outputs raw binary data. &false; outputs lowercase hexits. &reftitle.returnvalues; Returns a string containing the calculated certificate fingerprint as lowercase hexits unless raw_output is set to &true; in which case the raw binary representation of the message digest is returned. Returns &false; on failure.