PORT_Memcpy(&key->data[sn->len], issuer->data, issuer->len);
PORT_Memcpy(&key->data[start + sn->len], issuer->data, issuer->len);
nsslowcert_KeyFromIssuerAndSN(PRArenaPool *arena, SECItem *issuer, SECItem *sn,			SECItem *key){    key->len = sn->len + issuer->len;        key->data = (unsigned char*)PORT_ArenaAlloc(arena, key->len);    if ( !key->data ) {	goto loser;    }    /* copy the serialNumber */    PORT_Memcpy(key->data, sn->data, sn->len);    /* copy the issuer */    PORT_Memcpy(&key->data[sn->len], issuer->data, issuer->len);    return(SECSuccess);loser:    return(SECFailure);}