util.randrange: expand docstring

2023-08-16 16:32:42 +00:00
parent 5e1e7dd9b3
commit 2c2e3f8ca4
1 changed files with 3 additions and 1 deletions
--- a/electrum/util.py
+++ b/electrum/util.py
@@ -1724,7 +1724,9 @@ def resolve_dns_srv(host: str):

 def randrange(bound: int) -> int:
    """Return a random integer k such that 1 <= k < bound, uniformly
-    distributed across that range."""
+    distributed across that range.
+    This is guaranteed to be cryptographically strong.
+    """
    # secrets.randbelow(bound) returns a random int: 0 <= r < bound,
    # hence transformations:
    return secrets.randbelow(bound - 1) + 1