"CPACF/KIMD", &useGHASH) impl.Register("gcm", "CPACF/KMA", &useGCM) } func checkGenericIsExpect() { if useGHASH || useGCM { panic("gcm: internal error: using generic implementation despite hardware support") } } // gcmLengths writes len0 || len1 as big-endian values to a 16-byte array. func gcmLengths(len0, len1 uint64) [16]byte { v := [16]byte{} byteorder.BEPutUint64(v[0:], len0) byteorder.BEPutUint64(v[8:], len1) return v } // gcmHashKey represents the 16-byte hash key required by the GHASH algorithm. type...