AES block size in bytes. const BlockSize = 16 // A Block is an instance of AES using a particular key. // It is safe for concurrent use. type Block struct { block } // blockExpanded is the block type used for all architectures except s390x, // which feeds the raw key directly to its instructions. type blockExpanded struct { rounds int // Round keys, where only the first (rounds + 1) × (128 ÷ 32) words are used. enc [60]uint32 dec [60]uint32 } const ( // AES-128 has 128-bit keys, 10 rounds, and uses...