With the approval of the attorney general as to form and legality, the department may, and with the approval of the attorney general as to form and legality and of the director as to fiscal responsibility, an agency may:
may be payable in the medium of payment at the place or places within or without the State; may carry registration privileges; may be subject to terms of redemption, to tenders for purchase or to purchase prior to their stated maturity at the option of the department or the agency, or the holder, or both; and may contain terms, covenants, and conditions; and may be in the form, either coupon or registered, as the financing agreement may provide. Amounts held by a trustee shall be invested by the trustee at the direction of the department or the agency in investments as are permitted by state law and as shall be specified in the agreement with the trustee. Interest earned on any investment held by a trustee as security for a financing agreement may, at the option of the department or the agency, be credited to the accounts held by the trustee and applied in payment of sums due under the financing agreement;
HRS § 37D-3