index on dev: f6440af4 Delete README.md

lib/block/validation/local/block_signature.ex

+defmodule Block.Validation.Local.BlockSignature do
+  require Logger
+
+  def invalid_g1_block() do
+    [
+      15144,
+      31202,
+      85448,
+      87566,
+      90830,
+      109_327,
+      189_835,
+      199_172,
+      221_274,
+      253_582
+    ]
+  end
+
+  def invalid_gt_blocks() do
+    [
+      24316,
+      62067,
+      62551,
+      93288,
+      173_118,
+      183_706,
+      196_196,
+      246_027,
+      247_211,
+      263_207,
+      307_038,
+      328_741,
+      335_914,
+      377_316,
+      395_714,
+      396_024,
+      407_913,
+      422_366,
+      496_751
+    ]
+  end
+
+  @doc """
+  check if block signature is valid
+  """
+  def valid(block) do
+    # Historically, Duniter used a buggy version of TweetNaCl (see duniter #1390)
+    # Starting with the v12 blocks, Duniter uses a fixed version of TweetNaCl.
+    signed_part = get_signed_part(block["inner_hash"], to_string(block["nonce"]))
+
+    cond do
+      Crypto.verify_digital_signature(block["signature"], signed_part, block["issuer"]) ->
+        true
+
+      (block["version"] < 12 and block["currency"] === "G1" and
+         Enum.member?(invalid_g1_block(), block["number"])) or
+          (block["version"] < 12 and block["currency"] === "GT" and
+             Enum.member?(invalid_gt_blocks(), block["number"])) ->
+        true
+
+      true ->
+        Logger.error("Block's signature must match")
+        false
+    end
+
+    # if Crypto.verify_digital_signature(block["signature"], signed_part, block["issuer"]) do
+    #   true
+    # else
+    #   # If DUBP < v12, block may have invalid signature
+    #   if (block["version"] < 12 and block["currency"] === "G1" and
+    #         Enum.member?(invalid_g1_block(), block["number"])) or
+    #        (block["version"] < 12 and block["currency"] === "GT" and
+    #           Enum.member?(invalid_gt_blocks(), block["number"])) do
+    #     true
+    #   else
+    #     Logger.error("Block's signature must match")
+    #     false
+    #   end
+    # end
+  end
+
+  defp get_signed_part(inner_hash, nonce) do
+    "InnerHash: " <> inner_hash <> "\n" <> "Nonce: " <> nonce <> "\n"
+  end
+end