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Export verify_proof/4 and add get_target/2

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verify_proof/4 checks that a solution is a valid solution it doesn't check
it against any target.

get_target/2 returns the target of a solution in integer form
(not scientific).
This commit is contained in:
Juraj Hlista
2019-03-12 12:21:29 +07:00
parent 84f59998a2
commit 87ee39ffb0
3 changed files with 48 additions and 30 deletions
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src/aeminer_pow.erl
-6
View File
@@ -136,12 +136,6 @@ test_target(Bin, Target) ->
<<Val:32/big-unsigned-integer-unit:8>> = Bin,
Val < Threshold.
%% TODO: get target
%Bin = solution_to_binary(lists:sort(Soln), NodeSize * 8, <<>>),
%%Hash = aec_hash:hash(pow, Bin),
%%<<Val:32/big-unsigned-integer-unit:8>> = Hash,
%%Val
%%%=============================================================================
%%% Internal functions
%%%=============================================================================
src/aeminer_pow_cuckoo.erl
+28 -17
View File
@@ -25,7 +25,9 @@
]).
-export([generate/5,
verify/5
verify/5,
verify_proof/4,
get_target/2
]).
-export_type([hashable/0,
@@ -53,6 +55,8 @@
-type nonce() :: aeminer_pow:nonce().
-type int_target() :: aeminer_pow:int_target().
-type sci_target() :: aeminer_pow:sci_target().
-type instance() :: aeminer_pow:instance()
@@ -193,14 +197,35 @@ generate(Data, Target, Nonce, Config, Instance) when
boolean().
verify(Data, Nonce, Soln, Target, EdgeBits) when
is_list(Soln), Nonce >= 0, Nonce =< ?MAX_NONCE ->
Hash = aeminer_blake2b_256:hash(Data),
case test_target(Soln, Target, EdgeBits) of
true ->
verify_proof(Hash, Nonce, Soln, EdgeBits);
verify_proof(Data, Nonce, Soln, EdgeBits);
false ->
false
end.
%%------------------------------------------------------------------------------
%% @doc
%% Proof of Work verification
%% @end
%%------------------------------------------------------------------------------
-spec verify_proof(hashable(), nonce(), solution(), edge_bits()) -> boolean().
verify_proof(Data, Nonce, Solution, EdgeBits) ->
%% Cuckoo has an 80 byte header, we have to use that as well
%% packed Hash + Nonce = 56 bytes, add 24 bytes of 0:s
Hash = aeminer_blake2b_256:hash(Data),
Header0 = pack_header_and_nonce(Hash, Nonce),
Header = <<(list_to_binary(Header0))/binary, 0:(8*24)>>,
verify_proof_(Header, Solution, EdgeBits).
-spec get_target(solution(), edge_bits()) -> int_target().
get_target(Soln, EdgeBits) when is_list(Soln), length(Soln) =:= ?SOLUTION_SIZE ->
NodeSize = get_node_size(EdgeBits),
Bin = solution_to_binary(lists:sort(Soln), NodeSize * 8, <<>>),
Hash = aeminer_blake2b_256:hash(Bin),
<<Val:32/big-unsigned-integer-unit:8>> = Hash,
Val.
%% Internal functions.
generate_int(Hash, Nonce, Target,
@@ -270,20 +295,6 @@ exec_bin_dir(#config{exec_group = ExecGroup}) ->
-define(POW_DEAD_END, {error, cycle_dead_ends}).
-define(POW_SHORT_CYCLE, {error, cycle_too_short}).
%%------------------------------------------------------------------------------
%% @doc
%% Proof of Work verification (difficulty check should be done before calling
%% this function)
%% @end
%%------------------------------------------------------------------------------
verify_proof(Hash, Nonce, Solution, EdgeBits) ->
%% Cuckoo has an 80 byte header, we have to use that as well
%% packed Hash + Nonce = 56 bytes, add 24 bytes of 0:s
Header0 = pack_header_and_nonce(Hash, Nonce),
Header = <<(list_to_binary(Header0))/binary, 0:(8*24)>>,
verify_proof_(Header, Solution, EdgeBits).
verify_proof_(Header, Solution, EdgeBits) ->
{K0, K1, K2, K3} = aeminer_siphash24:create_keys(Header),