Finds the given recid which recovers the given signature for the message to the given Ethereum address. This is a very simple guess-check-revise since there are only four possible values, and we only accept two of those.

Examples

iex> use Signet.Hex iex> priv_key = ~h[0x800509fa3e80882ad0be77c27505bdc91380f800d51ed80897d22f9fcc75f4bf] iex> {:ok, sig} = Signet.Signer.Curvy.sign("test", priv_key) iex> {:ok, recid} = Signet.Recover.find_recid("test", sig, ~h[0x63CC7C25E0CDB121ABB0FE477A6B9901889F99A7]) iex> Signet.Recover.recover_eth("test", %{sig|recid: recid}) ...> |> to_hex() "0x63cc7c25e0cdb121abb0fe477a6b9901889f99a7"

Prefixes a message with "Etheruem Signed Message" prefix, as per EIP-191.

Examples

iex> Signet.Recover.prefix_eth("hello") "Ethereum Signed Message:\n5hello"

Recovers a signer's Ethereum address from a signed message. The message will be digested by keccak first. Note: the rec_id can be embeded in the signature or passed separately.

Examples

iex> use Signet.Hex iex> priv_key = ~h[0x800509fa3e80882ad0be77c27505bdc91380f800d51ed80897d22f9fcc75f4bf] iex> {:ok, sig} = Signet.Signer.Curvy.sign("test", priv_key) iex> {:ok, recid} = Signet.Recover.find_recid("test", sig, ~h[0x63CC7C25E0CDB121ABB0FE477A6B9901889F99A7]) iex> Signet.Recover.recover_eth("test", %{sig|recid: recid}) ...> |> to_hex() "0x63cc7c25e0cdb121abb0fe477a6b9901889f99a7"

Recovers a signer's public key from a signed message. The message will be digested by keccak first. Note: the rec_id can be embeded in the signature or passed separately.

Examples

iex> use Signet.Hex iex> # Decoded Signature iex> priv_key = ~h[0x800509fa3e80882ad0be77c27505bdc91380f800d51ed80897d22f9fcc75f4bf] iex> {:ok, sig} = Signet.Signer.Curvy.sign("test", priv_key) iex> {:ok, recid} = Signet.Recover.find_recid("test", sig, ~h[0x63CC7C25E0CDB121ABB0FE477A6B9901889F99A7]) iex> Signet.Recover.recover_public_key("test", %{sig|recid: recid}) |> to_hex() "0x0480076bfb96955526052b2676dfca87e0b7869ce85e00c5dbce29e76b8429d6dbf0f33b1a0095b2a9a4d9ea2a9746b122995a5b5874ee3161138c9d19f072b2d9"

iex> use Signet.Hex iex> # Binary Signature iex> priv_key = ~h[0x800509fa3e80882ad0be77c27505bdc91380f800d51ed80897d22f9fcc75f4bf] iex> {:ok, sig} = Signet.Signer.Curvy.sign("test", priv_key) iex> {:ok, recid} = Signet.Recover.find_recid("test", sig, ~h[0x63CC7C25E0CDB121ABB0FE477A6B9901889F99A7]) iex> signature = <<sig.r::256, sig.s::256, recid>> iex> Signet.Recover.recover_public_key("test", signature) |> to_hex() "0x0480076bfb96955526052b2676dfca87e0b7869ce85e00c5dbce29e76b8429d6dbf0f33b1a0095b2a9a4d9ea2a9746b122995a5b5874ee3161138c9d19f072b2d9"

iex> use Signet.Hex iex> # EIP-155 Signature iex> priv_key = ~h[0x800509fa3e80882ad0be77c27505bdc91380f800d51ed80897d22f9fcc75f4bf] iex> {:ok, sig} = Signet.Signer.Curvy.sign("test", priv_key) iex> {:ok, recid} = Signet.Recover.find_recid("test", sig, ~h[0x63CC7C25E0CDB121ABB0FE477A6B9901889F99A7]) iex> recovery_bit = 35 + 5 * 2 + recid iex> signature = <<sig.r::256, sig.s::256, recovery_bit::8>> iex> Signet.Recover.recover_public_key("test", signature) |> to_hex() "0x0480076bfb96955526052b2676dfca87e0b7869ce85e00c5dbce29e76b8429d6dbf0f33b1a0095b2a9a4d9ea2a9746b122995a5b5874ee3161138c9d19f072b2d9"