master_share: add nonce; use base, not derived, seed ID as share identifier
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310ce2d05e
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c2e7421ff9
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3F8B1861E32B7DA2
2 changed files with 54 additions and 39 deletions
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@ -268,7 +268,6 @@ class SubSeed(SeedBase):
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return scramble_seed(seed.data,scramble_key)[:16 if short else seed.byte_len]
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class SeedShareList(SubSeedList):
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master_share = None
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have_short = False
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split_type = 'N-of-N'
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@ -281,24 +280,35 @@ class SeedShareList(SubSeedList):
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self.id_str = id_str or 'default'
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self.count = count
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if master_idx:
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self.master_share = SeedShareMaster(self,master_idx)
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def make_master_share():
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for nonce in range(SeedShare.max_nonce+1):
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ms = SeedShareMaster(self,master_idx,nonce)
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if ms.sid == parent_seed.sid:
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if g.debug_subseed:
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m = 'master_share seed ID collision with parent seed, incrementing nonce to {}'
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msg(m.format(nonce+1))
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else:
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return ms
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raise SubSeedNonceRangeExceeded('nonce range exceeded')
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while True:
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self.data = { 'long': IndexedDict(), 'short': IndexedDict() }
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if master_idx:
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self.data['long'][self.master_share.derived_seed.sid] = (1,master_idx)
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self.master_share = make_master_share() if master_idx else None
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for nonce in range(SeedShare.max_nonce+1):
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self.nonce_start = nonce
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self.data = { 'long': IndexedDict(), 'short': IndexedDict() } # 'short' is required as a placeholder
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if self.master_share:
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self.data['long'][self.master_share.sid] = (1,self.master_share.nonce)
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self._generate(count-1)
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self.last_share = SeedShareLast(self)
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sid = self.last_share.sid
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if sid in self.data['long'] or sid == parent_seed.sid:
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self.last_share = ls = SeedShareLast(self)
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if ls.sid in self.data['long'].keys + [parent_seed.sid]:
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# collision: throw out entire split list and redo with new start nonce
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if g.debug_subseed:
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self._collision_debug_msg(sid,count,self.nonce_start,nonce_desc='nonce_start')
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self.nonce_start += 1
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self._collision_debug_msg(ls.sid,count,nonce,nonce_desc='nonce_start')
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else:
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self.data['long'][sid] = (self.count,self.nonce_start)
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self.data['long'][ls.sid] = (self.count,nonce)
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break
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else:
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raise SubSeedNonceRangeExceeded('nonce range exceeded')
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if g.debug_subseed:
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A = parent_seed.data
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@ -331,7 +341,7 @@ class SeedShareList(SubSeedList):
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fs2 = '{i:>5}: {}\n'
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mfs1,mfs2,midx,msid = ('','','','')
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if self.master_share:
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mfs1,mfs2 = (' with master share #{} ({})',' master #{} ({})')
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mfs1,mfs2 = (' with master share #{} ({})',' master share #{}')
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midx,msid = (self.master_share.idx,self.master_share.sid)
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hdr = ' {} {} ({} bits)\n'.format('Seed:',self.parent_seed.sid.hl(),self.parent_seed.bitlen)
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@ -341,7 +351,7 @@ class SeedShareList(SubSeedList):
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hdr += fs1.format('------')
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sl = self.data['long'].keys
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body1 = fs2.format(sl[0]+mfs2.format(midx,msid),i=1)
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body1 = fs2.format(sl[0]+mfs2.format(midx),i=1)
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body = (fs2.format(sl[n],i=n+1) for n in range(1,len(self)))
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return hdr + body1 + ''.join(body)
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@ -384,10 +394,11 @@ class SeedShareLast(SeedBase):
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class SeedShareMaster(SeedBase):
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idx = MMGenImmutableAttr('idx',MasterShareIdx)
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nonce = 0
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nonce = MMGenImmutableAttr('nonce',int,typeconv=False)
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def __init__(self,parent_list,idx):
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def __init__(self,parent_list,idx,nonce):
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self.idx = idx
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self.nonce = nonce
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self.parent_list = parent_list
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SeedBase.__init__(self,self.make_base_seed_bin())
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@ -396,7 +407,7 @@ class SeedShareMaster(SeedBase):
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def make_base_seed_bin(self):
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seed = self.parent_list.parent_seed
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# field maximums: idx: 65535 (1024)
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scramble_key = b'master:' + self.idx.to_bytes(2,'big')
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scramble_key = b'master_share:' + self.idx.to_bytes(2,'big') + self.nonce.to_bytes(2,'big')
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return scramble_seed(seed.data,scramble_key)[:seed.byte_len]
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def make_derived_seed_bin(self,id_str,count):
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@ -27,22 +27,21 @@ class unit_test(object):
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test_data_master = {
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'1': {
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'default': (
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(8,'4710FBF0','B512A312','3588E156','9374255D','3E87A907','752A2E4E',0,0),
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(4,'43670520','05880E2B','C6B438D4','5FF9B5DF','778E9C60','2C01F046',0,0) ),
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(8,'4710FBF0','6AE6177F','AC12090C','6AE6177F','3E87A907','7D1FEA56','BFEBFFFF','629A9808'),
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(4,'43670520','6739535C','ABF4DD38','6739535C','778E9C60','89CBCFD2','689FABF5','70BED76B'),
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),
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'φυβαρ': (
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(8,'4710FBF0','5FA963B0','69A1F56A','25789CC4','9777A750','E17B9B8B',0,0),
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(4,'43670520','AF8BFDF8','66F319BE','A5E40978','927549D2','93B2418B',0,0),
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)
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(8,'4710FBF0','6AE6177F','AC5FA32E','6AE6177F','9777A750','C7CF2AFC','035AAACB','C777FBE4'),
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(4,'43670520','6739535C','37EBA2F5','6739535C','927549D2','29BADEE7','9CA73A03','313F5528'))
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},
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'5': {
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'default': (
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(8,'4710FBF0','A8A34BC0','F69B6CF8','234B5DCD','BB004DC5','08DC9776',0,0),
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(4,'43670520','C887A2D6','86AE9445','3188AD3D','07339882','BE3FE72A',0,0) ),
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(8,'4710FBF0','5EFAC3D6','B489167D','5EFAC3D6','BB004DC5','1A0381C0','4EA182E3','547FB2DC'),
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(4,'43670520','EE93DB0E','44962A7D','EE93DB0E','07339882','376A05B1','CE51D022','00149CA3'),
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),
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'φυβαρ': (
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(8,'4710FBF0','89C35D99','B1CD5854','8414652C','32C24668','17CA1E19',0,0),
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(4,'43670520','06929789','32E8E375','C6AC3C9D','4BEA2AB2','15AFC7F2',0,0)
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)
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(8,'4710FBF0','5EFAC3D6','A6E27EE3','5EFAC3D6','32C24668','B4C54297','1EC9B71B','8C5C6B1C'),
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(4,'43670520','EE93DB0E','B584E963','EE93DB0E','4BEA2AB2','4BEA65C7','140FC43F','BBD19461'))
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}
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}
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if master_idx:
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@ -67,12 +66,17 @@ class unit_test(object):
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vmsg_r('\n{}'.format(s))
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assert len(s.strip().split('\n')) == share_count+6, s
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A = shares.get_share_by_idx(1).sid
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B = shares.get_share_by_seed_id(j).sid
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if master_idx:
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A = shares.get_share_by_idx(1,base_seed=False).sid
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B = shares.get_share_by_seed_id(j,base_seed=False).sid
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assert A == B == m, A
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A = shares.get_share_by_idx(1,base_seed=True).sid
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B = shares.get_share_by_seed_id(j,base_seed=True).sid
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assert A == B == j, A
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A = shares.get_share_by_idx(share_count-1).sid
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B = shares.get_share_by_seed_id(k).sid
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A = shares.get_share_by_idx(share_count-1,base_seed=True).sid
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B = shares.get_share_by_seed_id(k,base_seed=True).sid
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assert A == B == k, A
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A = shares.get_share_by_idx(share_count).sid
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@ -111,17 +115,16 @@ class unit_test(object):
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msg('OK')
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def collisions():
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ss_count,last_sid,collisions_chk = (65535,'B5CBCE0A',3)
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def collisions(seed_hex,ss_count,last_sid,collisions_chk,master_idx):
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msg_r('Testing Seed ID collisions ({} seed shares)...'.format(ss_count))
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msg_r('Testing Seed ID collisions ({} seed shares, master_idx={})...'.format(ss_count,master_idx))
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vmsg('')
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seed_bin = bytes.fromhex('1dabcdef' * 4)
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seed_bin = bytes.fromhex(seed_hex)
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seed = Seed(seed_bin)
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SeedShareIdx.max_val = ss_count
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shares = seed.split(ss_count)
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shares = seed.split(ss_count,use_master=bool(master_idx),master_idx=master_idx)
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A = shares.get_share_by_idx(ss_count).sid
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B = shares.get_share_by_seed_id(last_sid).sid
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assert A == last_sid, A
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@ -141,6 +144,7 @@ class unit_test(object):
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basic_ops(master_idx=1)
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basic_ops(master_idx=5)
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defaults_and_limits()
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collisions()
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collisions('1dabcdef'*4,65535,'B5CBCE0A',3,master_idx=None)
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collisions('18abcdef'*4,65535,'FF03CE82',3,master_idx=1)
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return True
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