seed_v9: strip whitespaces before hashing

lib/mnemonic.py

@@ -21,6 +21,7 @@ import hmac
 import math
 import hashlib
 import unicodedata
+import string
 
 import ecdsa
 import pbkdf2
@@ -37,13 +38,10 @@ filenames = {
     'pt':'portuguese.txt',
 }
 
-def remove_accents(input_str):
-    nkfd_form = unicodedata.normalize('NFKD', unicode(input_str))
-    return u''.join([c for c in nkfd_form if not unicodedata.combining(c)])
 
 
 class Mnemonic(object):
-    # Seed derivation follows BIP39
+    # Seed derivation no longer follows BIP39
     # Mnemonic phrase uses a hash based checksum, instead of a wordlist-dependent checksum
 
     def __init__(self, lang='en'):
@@ -68,9 +66,10 @@ class Mnemonic(object):
 
     @classmethod
     def prepare_seed(self, seed):
-        # remove accents to tolerate typos
-        seed = unicode(remove_accents(seed.strip()))
-        seed = unicodedata.normalize('NFKD', seed)
+        # normalize
+        seed = unicodedata.normalize('NFKD', unicode(seed))
+        # remove accents and whitespaces
+        seed = u''.join([c for c in seed if not unicodedata.combining(c) and not c in string.whitespace])
         return seed
 
     def mnemonic_encode(self, i):
@@ -113,7 +112,7 @@ class Mnemonic(object):
             assert i == self.mnemonic_decode(seed)
             if is_old_seed(seed):
                 continue
-            if is_new_seed(self.prepare_seed(seed), prefix):
+            if is_new_seed(seed, prefix):
                 break
         print_error('%d words'%len(seed.split()))
         return seed