Signatures & Recovery

Manage keypairs to sign messages in EIP-191 (personal_sign) format or typed data in EIP-712 (sign_typed_data) format.

key = Eth::Key.new priv: "268be6f4a68c40f6862b7ac9aed8f701dc25a95ddb9a44d8b1f520b75f440a9a"
# => #<Eth::Key:0x00005574a699adc0 @private_key=#<Secp256k1::PrivateKey:0x00005574a6998200 @data="&\x8B\xE6\xF4\xA6\x8C@\xF6\x86+z\xC9\xAE\xD8\xF7\x01\xDC%\xA9]\xDB\x9AD\xD8\xB1\xF5 \xB7_D\n\x9A">, @public_key=#<Secp256k1::PublicKey:0x00005574a6998160>>
key.public_hex
# => "04b45200621c013a5fbab999ac33b0c836328a04afa0255ffbe6ea0f6fd97e187b02199886d942a9f50f7e279a2bc74c93b2afcbd7255489939f9b36a5eae5e281"
key.address.to_s
# => "0xD496b23D61F88A8C7758fca7560dCFac7b3b01F9"
key.personal_sign "Hello World!"
# => "ac6a59417d8688c8144f01a662384fa691636b48a071d4b7c13902bb87ca472b0bce1d7a758f39a5759ed5e937ce61f50dd1b83158371f8d0faeb9b7d81c194225"

Recover and verify personal signatures respecting EIPs 155, 191, and 712.

address = Eth::Address.new "0xd496b23d61f88a8c7758fca7560dcfac7b3b01f9"
# => #<Eth::Address:0x00005574a6bd4fc8 @address="0xd496b23d61f88a8c7758fca7560dcfac7b3b01f9">
signature = "ac6a59417d8688c8144f01a662384fa691636b48a071d4b7c13902bb87ca472b0bce1d7a758f39a5759ed5e937ce61f50dd1b83158371f8d0faeb9b7d81c19422d"
# => "ac6a59417d8688c8144f01a662384fa691636b48a071d4b7c13902bb87ca472b0bce1d7a758f39a5759ed5e937ce61f50dd1b83158371f8d0faeb9b7d81c19422d"
recovered_key = Eth::Signature.personal_recover "Hello World!", signature, Eth::Chain::GOERLI
# => "04b45200621c013a5fbab999ac33b0c836328a04afa0255ffbe6ea0f6fd97e187b02199886d942a9f50f7e279a2bc74c93b2afcbd7255489939f9b36a5eae5e281"
Eth::Util.public_key_to_address(recovered_key).to_s
# => "0xD496b23D61F88A8C7758fca7560dCFac7b3b01F9"
Eth::Signature.verify "Hello World!", signature, address, Eth::Chain::GOERLI
# => true

See /spec or Documentation for signing typed data as per EIP-712.