1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
(*****************************************************************************)
(* *)
(* Open Source License *)
(* Copyright (c) 2018 Dynamic Ledger Solutions, Inc. <contact@tezos.com> *)
(* *)
(* Permission is hereby granted, free of charge, to any person obtaining a *)
(* copy of this software and associated documentation files (the "Software"),*)
(* to deal in the Software without restriction, including without limitation *)
(* the rights to use, copy, modify, merge, publish, distribute, sublicense, *)
(* and/or sell copies of the Software, and to permit persons to whom the *)
(* Software is furnished to do so, subject to the following conditions: *)
(* *)
(* The above copyright notice and this permission notice shall be included *)
(* in all copies or substantial portions of the Software. *)
(* *)
(* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR*)
(* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *)
(* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL *)
(* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER*)
(* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING *)
(* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER *)
(* DEALINGS IN THE SOFTWARE. *)
(* *)
(*****************************************************************************)
type t = Seed_repr.nonce
type nonce = t
let encoding = Seed_repr.nonce_encoding
type error +=
| Too_late_revelation
| Too_early_revelation
| Previously_revealed_nonce
| Unexpected_nonce
let () =
register_error_kind
`Branch
~id:"nonce.too_late_revelation"
~title:"Too late nonce revelation"
~description:"Nonce revelation happens too late"
~pp:(fun ppf () ->
Format.fprintf ppf "This nonce cannot be revealed anymore.")
Data_encoding.unit
(function Too_late_revelation -> Some () | _ -> None)
(fun () -> Too_late_revelation) ;
register_error_kind
`Temporary
~id:"nonce.too_early_revelation"
~title:"Too early nonce revelation"
~description:"Nonce revelation happens before cycle end"
~pp:(fun ppf () ->
Format.fprintf ppf "This nonce should not yet be revealed")
Data_encoding.unit
(function Too_early_revelation -> Some () | _ -> None)
(fun () -> Too_early_revelation) ;
register_error_kind
`Branch
~id:"nonce.previously_revealed"
~title:"Previously revealed nonce"
~description:"Duplicated revelation for a nonce."
~pp:(fun ppf () -> Format.fprintf ppf "This nonce was previously revealed")
Data_encoding.unit
(function Previously_revealed_nonce -> Some () | _ -> None)
(fun () -> Previously_revealed_nonce) ;
register_error_kind
`Branch
~id:"nonce.unexpected"
~title:"Unexpected nonce"
~description:
"The provided nonce is inconsistent with the committed nonce hash."
~pp:(fun ppf () ->
Format.fprintf
ppf
"This nonce revelation is invalid (inconsistent with the committed \
hash)")
Data_encoding.unit
(function Unexpected_nonce -> Some () | _ -> None)
(fun () -> Unexpected_nonce)
(* checks that the level of a revelation is not too early or too late wrt to the
current context and that a nonce has not been already revealed for that level *)
let get_unrevealed ctxt level =
let cur_level = Level_storage.current ctxt in
match Cycle_repr.pred cur_level.cycle with
| None ->
fail Too_early_revelation (* no revelations during cycle 0 *)
| Some revealed_cycle -> (
if Cycle_repr.(revealed_cycle < level.Level_repr.cycle) then
fail Too_early_revelation
else if Cycle_repr.(level.Level_repr.cycle < revealed_cycle) then
fail Too_late_revelation
else
Storage.Seed.Nonce.get ctxt level
>>=? function
| Revealed _ ->
fail Previously_revealed_nonce
| Unrevealed status ->
return status )
let record_hash ctxt unrevealed =
let level = Level_storage.current ctxt in
Storage.Seed.Nonce.init ctxt level (Unrevealed unrevealed)
let reveal ctxt level nonce =
get_unrevealed ctxt level
>>=? fun unrevealed ->
fail_unless
(Seed_repr.check_hash nonce unrevealed.nonce_hash)
Unexpected_nonce
>>=? fun () ->
Storage.Seed.Nonce.set ctxt level (Revealed nonce)
>>=? fun ctxt -> return ctxt
type unrevealed = Storage.Seed.unrevealed_nonce = {
nonce_hash : Nonce_hash.t;
delegate : Signature.Public_key_hash.t;
rewards : Tez_repr.t;
fees : Tez_repr.t;
}
type status = Storage.Seed.nonce_status =
| Unrevealed of unrevealed
| Revealed of Seed_repr.nonce
let get = Storage.Seed.Nonce.get
let of_bytes = Seed_repr.make_nonce
let hash = Seed_repr.hash
let check_hash = Seed_repr.check_hash