OPENSSL_rndrrs_bytes
size_t OPENSSL_rndrrs_bytes(unsigned char *buf, size_t len);
size_t OPENSSL_rndrrs_bytes(unsigned char *buf, size_t len);
if (OPENSSL_rndrrs_bytes(buf, len) != len)
return sanity_check_bytes(OPENSSL_rndrrs_bytes, 1000, 0, 10000, 10);
size_t OPENSSL_rndrrs_bytes(unsigned char *buf, size_t len);