xmr: wrappers cleanup

src/apps/monero/xmr/common.py

@@ -5,37 +5,11 @@ class XmrException(Exception):
     pass
 
 
-def random_bytes(by):
-    """
-    Generates X random bytes, returns byte-string
-    :param by:
-    :return:
-    """
-    return random.bytes(by)
-
-
 def ct_equal(a, b):
-    """
-    Constant time a,b comparison
-    :param a:
-    :param b:
-    :return:
-    """
     return monero.ct_equals(a, b)
 
 
-def memcpy(dst, dst_from, src, src_from, length):
-    from trezor.utils import memcpy
-
-    return memcpy(dst, dst_from, src, src_from, length)
-
-
 def check_permutation(permutation):
-    """
-    Check permutation sanity
-    :param permutation:
-    :return:
-    """
     for n in range(len(permutation)):
         if n not in permutation:
             raise ValueError("Invalid permutation")
@@ -62,41 +36,9 @@ def apply_permutation(permutation, swapper):
 
 
 def is_empty(inp):
-    """
-    True if none or empty
-    :param inp:
-    :return:
-    """
     return inp is None or len(inp) == 0
 
 
-def defval(val, default=None):
-    """
-    Returns val if is not None, default instead
-    :param val:
-    :param default:
-    :return:
-    """
-    return val if val is not None else default
-
-
 def defval_empty(val, default=None):
-    """
-    Returns val if is not None, default instead
-    :param val:
-    :param default:
-    :return:
-    """
     return val if not is_empty(val) else default
 
-
-def chunk(arr, size=1):
-    res = []
-    idx = 0
-    while True:
-        c = arr[idx : idx + size]
-        res.append(c)
-        idx += size
-        if len(c) != size:
-            break
-    return res

src/apps/monero/xmr/ring_ct.py

@@ -178,7 +178,7 @@ def generate_ring_signature(prefix_hash, image, pubs, sec, sec_idx, test=False):
     :param test:
     :return:
     """
-    from apps.monero.xmr.common import memcpy
+    from trezor.utils import memcpy
 
     if test:
         from apps.monero.xmr import monero
@@ -250,7 +250,7 @@ def check_ring_singature(prefix_hash, image, pubs, sig):
     :param sig:
     :return:
     """
-    from apps.monero.xmr.common import memcpy
+    from trezor.utils import memcpy
 
     image_unp = crypto.ge_frombytes_vartime(image)
     image_pre = crypto.ge_dsm_precomp(image_unp)