Adds functions to access digest

crates/compiler/builtins/roc/Crypt.roc

@@ -3,12 +3,14 @@ module [
     addBytes,
     digest,
     hashSha256,
+    digest256ToBytes,
     Sha256,
     Digest256,
 ]
 
 import List
-import Num exposing [U8, U64, U128]
+import Num exposing [U8, U64, U128, Int]
+import Num
 
 Sha256 := {
     location : U64,
@@ -17,14 +19,27 @@ Sha256 := {
 Digest256 := {
     firstHalf : U128,
     secondHalf : U128,
-}
+} implements[Eq, Hash]
 
 emptySha256 : {} -> Sha256
 
-addBytes : Sha256, List.List U8 -> Sha256
+addBytes : Sha256, List U8 -> Sha256
 
 digest : Sha256 -> Digest256
 
 hashSha256 : List U8 -> Digest256
 hashSha256 = \bytes ->
     digest (addBytes (emptySha256 {}) bytes)
+
+u128Bytes : Int -> List  U8
+u128Bytes = \ number ->
+    loop = \ n, bytes, place ->
+        if place == 16 then bytes
+        else  
+            newByte = n |> Num.bitwiseAnd 255 |> Num.toU8 
+            loop (Num.shiftRightBy n 8) (List.append bytes newByte) (place + 1)
+    loop number [] 0
+
+digest256ToBytes : Digest256 -> List U8
+digest256ToBytes \ digest256 -> 
+    List.append (u128Bytes digest256.firstHalf) (u128Bytes digest256.secondHalf)