remove random.bytes, use ngu.random.bytes directly instead

shared/random.py

@@ -7,8 +7,8 @@ import ngu
 # use this instead of rand%n
 randbelow = ngu.random.uniform
 
-# for bytes
-bytes = ngu.random.bytes
+# for bytes, use ngu.random.byte(len)
+#bytes = ngu.random.bytes
 
 # In-place list shuffle using Fisher-Yates algo
 #

shared/seed.py

@@ -505,11 +505,13 @@ async def ephemeral_seed_generate_from_dice(nwords):
         await set_ephemeral_seed_words(words, meta='Dice')
 
 def generate_seed():
-    seed = random.bytes(32)
+    # Generate 32 bytes of best-quality high entropy TRNG bytes.
+
+    seed = ngu.random.bytes(32)
     assert len(set(seed)) > 4       # TRNG failure
-    # hash to mitigate possible bias in TRNG
-    seed = ngu.hash.sha256s(seed)
-    return seed
+
+    # hash to mitigate any possible bias in TRNG
+    return ngu.hash.sha256d(seed)
 
 async def make_new_wallet(nwords):
     # Pick a new random seed.

shared/xor_seed.py

@@ -86,7 +86,7 @@ Otherwise, press OK to continue.'''.format(n=num_parts), escape='2')
         parts = []
         for i in range(num_parts-1):
             if use_rng:
-                here = random.bytes(vlen)
+                here = ngu.random.bytes(vlen)
                 assert len(set(here)) > 4       # TRNG failure?
                 mask = ngu.hash.sha256d(here)
             else: