val little_endian (b: bytes) : Tot (n : nat) (decreases (Seq.length b))
val little_endian (b: bytes) : Tot (n : nat) (decreases (Seq.length b))
let rec little_endian (b:bytes) : Tot (n:nat) (decreases (Seq.length b)) =
  if Seq.length b = 0 then 0
  else
    UInt8.v (head b) + pow2 8 * little_endian (tail b)
module MiTLS.FStar.Old.Endianness
open MiTLS

module ST = FStar.HyperStack.ST

open FStar.HyperStack.All

open FStar.UInt32
open FStar.Ghost
open FStar.Mul
open FStar.Int.Cast

module U8 = FStar.UInt8

let u8  = UInt8.t
let u32 = UInt32.t
let u64 = UInt64.t

#set-options "--initial_fuel 0 --max_fuel 0"

type bytes  = Seq.seq U8.t // Pure sequence of bytes

type  lbytes  (l:nat) = b:bytes   {Seq.length b == l}

(* type lbuffer (l:nat) = b:buffer {Buffer.length b == l} *)

#reset-options

let uint128_to_uint8 (a:UInt128.t) : Tot (b:UInt8.t{UInt8.v b = UInt128.v a % pow2 8})
  = Math.Lemmas.pow2_modulo_modulo_lemma_2 (UInt128.v a) 64 8;
    uint64_to_uint8 (FStar.UInt128.uint128_to_uint64 a)

#reset-options "--z3rlimit 20 --initial_fuel 0 --max_fuel 0"


open FStar.Seq
/
prims.fst.checked FStar.UInt8.fsti.checked FStar.UInt64.fsti.checked FStar.UInt32.fsti.checked FStar.UInt128.fsti.checked FStar.Seq.fst.checked FStar.Pervasives.fsti.checked FStar.Mul.fst.checked FStar.Math.Lib.fst.checked FStar.Math.Lemmas.fst.checked FStar.Int.Cast.fst.checked FStar.HyperStack.ST.fsti.checked FStar.HyperStack.All.fst.checked FStar.Ghost.fsti.checked
MiTLS.FStar.Old.Endianness.fst
b: MiTLS.FStar.Old.Endianness.bytes -> Prims.Tot Prims.nat
MiTLS.FStar.Old.Endianness.bytes Prims.op_Equality Prims.int FStar.Seq.Base.length FStar.UInt8.t Prims.bool Prims.op_Addition FStar.UInt8.v FStar.Seq.Properties.head FStar.Mul.op_Star Prims.pow2 MiTLS.FStar.Old.Endianness.little_endian FStar.Seq.Properties.tail Prims.nat
let rec little_endian (b: bytes) : Tot (n : nat) (decreases (Seq.length b)) =
  
if Seq.length b = 0 then 0 else UInt8.v (head b) + pow2 8 * little_endian (tail b)