from src into dst, using the expanded key xk. func encryptBlockGeneric(c *blockExpanded, dst, src []byte) { checkGenericIsExpect() xk := c.enc[:] _ = src[15] // early bounds check s0 := byteorder.BEUint32(src[0:4]) s1 := byteorder.BEUint32(src[4:8]) s2 := byteorder.BEUint32(src[8:12]) s3 := byteorder.BEUint32(src[12:16]) // First round just XORs input with key. s0 ^= xk[0] s1 ^= xk[1] s2 ^= xk[2] s3 ^= xk[3] // Middle rounds shuffle using tables. k := 4 var t0, t1, t2, t3 uint32 for r := 0; r < c.rounds-1;...