PHP. Руководство по PHP. 2005
openssl_error_string
openssl_error_string
Description
string openssl_error_string (void)Returns an error message string, or FALSE if there are no more error
messages to return.
openssl_error_string() returns the last error from the
openSSL library. Error messages are stacked, so this function should be
called multiple times to collect all of the information.
openssl_csr_sign
openssl_free_key
Отвечу на любые вопросы. С уважением, Дмитрий Владимирович.