Changes

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| u8 [0], [2], and [3] must be zero. When u8 [1] is non-zero, this indicates that the additional 0x20-bytes block at the end of movable.sed exists, thus this enables verifying the AES-MAC.

| When u8[1] is non-zero, this indicates that the additional 0x20-bytes AES-MAC block at the end of movable.sed exists. If u8[1] is zero, then u8 [0], [2], and [3] must be zero as well.

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