lib: method for eip-1271

[q9f]

closes #44

[q9f]

paging @w4ll3 - could you please take a look if this would make sense for you?

c = Contract.create(file: "spec/fixtures/contracts/signer.sol", contract_index: 1)
# => #<Eth::Contract::Signer:0x0000556cd236ff30>
g = Eth::Client.create "/tmp/geth.ipc"
# => #<Eth::Client::Ipc:0x0000556cd23c34a0 @gas_limit=21000, @id=0, @max_fee_per_gas=0.2e11, @max_priority_fee_per_gas=0, @path="/tmp/geth.ipc">
m = "I am authentic!"
# => "I am authentic!"
p = Signature.prefix_message m
# => "\u0019Ethereum Signed Message:\n15I am authentic!"
h = Util.keccak256 p
# => "p\xFB\xC5w\xC8\xE0zo\xD0!r%\xD8\x7Fc\x8B~\xD2n/R\x12\x93\x1DI\xD3$\xDA\a\xF3\x1D\xF2"
s = Util.hex_to_bin "2166d149f4cddd5cf0e8f165366322a3fce0d05e82269371477199f12160c72c0de17dea759a80e# 2c40334903a2ec5b7d53ba47e0eb9d8dd996a921e811a58a61c"
=> "!f\xD1I\xF4\xCD\xDD\\\xF0\xE8\xF1e6c\"\xA3\xFC\xE0\xD0^\x82&\x93qGq\x99\xF1!`\xC7,\r\xE1}\xEAu\x9A\x80\xE2\xC4\x034\x90:.\xC5\xB7\xD5;\xA4~\x0E\xB9\xD8\xDD\x99j\x92\x1E\x81\x1AX\xA6\x1C"
_ = g.deploy_and_wait(c)
# => "0x967ce372d0f30ba9d466d1b047b0362f82e29ab9"
g.is_valid_signature c, h, s
# => true

[codecov-commenter]

Codecov Report

Merging #80 (3205de0) into main (07befbe) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #80   +/-   ##
=======================================
  Coverage   99.73%   99.73%           
=======================================
  Files          67       67           
  Lines        3754     3780   +26     
=======================================
+ Hits         3744     3770   +26     
  Misses         10       10           

Impacted Files	Coverage Δ
lib/eth/client.rb	100.00% <100.00%> (ø)
spec/eth/client_spec.rb	100.00% <100.00%> (ø)

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[kurotaky]

Great !