helpeth

Help (with) Ethereum. Purists' commandline tool for key and transaction management.

It uses ethereumjs-wallet and ethereumjs-tx.

Installation

Install it as a global package: npm install -g helpeth

It uses secp256k1 for the cryptography. Make sure to have either OpenSSL or GMP installed.

How to use

See the help output with helpeth --help:

Usage: helpeth [command]

Commands:
  signMessage <message>                     Sign a message
  verifySig <hash> <sig>                    Verify signature
  verifySigParams <hash> <r> <s> <v>        Verify signature parameters
  createTx <nonce> <to> <value> <data>      Sign a transaction
  <gasLimit> <gasPrice>
  assembleTx <nonce> <to> <value> <data>    Assemble a transaction from its
  <gasLimit> <gasPrice> <v> <r> <s>         components
  parseTx <tx>                              Parse raw transaction
  keyGenerate [format] [icapdirect]         Generate new key
  keyConvert                                Convert a key to V3 keystore format
  keyDetails                                Print key details
  bip32Details <path>                       Print key details for a given path
  addressDetails <address>                  Print details about an address
  unitConvert <value> <from> <to>           Convert between Ethereum units

Options:
  -p, --private      Private key as a hex string                        [string]
  --password         Password for the private key                       [string]
  --password-prompt  Prompt for the private key password               [boolean]
  -k, --keyfile      Encoded key file                                   [string]
  --show-private     Show private key details                          [boolean]
  --mnemonic         Mnemonic for HD key derivation                     [string]
  --version          Show version number                               [boolean]
  --help             Show help                                         [boolean]

Examples

Generate a new key

$ helpeth keyGenerate
Address: 0xe0defb92145fef3c3a945637705fafd3aa74a241
Address (checksum): 0xe0DefB92145FeF3c3a945637705fAfd3AA74a241
ICAP: XE82 Q9ML VOQY V5TD N4MF MK9U KKHS JU9N 9S1
Public key: 0x93e39cde5cdb3932e204cdd43b89578ad58d7489c31cbc30e61d167f67e3c8e76b9b2249377fa84f73b11c68f2f7a62f205f430f3a4370fd5dab6e3139d84977
Private key: 0xba1488fd638adc2e9f62fc70d41ff0ffc0e8d32ef6744d801987bc3ecb6a0953

Generate a new key and save as V3 keystore file

$ helpeth --password 'Use --password-prompt instead for security' keyGenerate v3
Address: 0x15f2f3e0f2d74ea7b185fc12f24cb4f402cc96d0
Address (checksum): 0x15F2f3e0F2D74eA7B185fC12F24cB4F402cC96D0
ICAP: XE53 2KAS Y050 UIFI VB1J 2636 IKXC 4QIP SK0
Public key: 0xf2a3a694026ed4abb16e18f0421a6e667803399dad2eae2ca8c3f95934fcb46e9440183fd278181deb501d2f0766d0f676d0cac84da3632590e2978cb6883bc4
Key saved as UTC--2016-03-17T19-06-57.064Z--15f2f3e0f2d74ea7b185fc12f24cb4f402cc96d0

Print details of an existing keyfile

$ helpeth --password 'Use --password-prompt instead for security' --keyfile UTC--2016-03-17T19-06-57.064Z--15f2f3e0f2d74ea7b185fc12f24cb4f402cc96d0 --show-private keyDetails
Address: 0x15f2f3e0f2d74ea7b185fc12f24cb4f402cc96d0
Address (checksum): 0x15F2f3e0F2D74eA7B185fC12F24cB4F402cC96D0
ICAP: XE53 2KAS Y050 UIFI VB1J 2636 IKXC 4QIP SK0
Public key: 0xf2a3a694026ed4abb16e18f0421a6e667803399dad2eae2ca8c3f95934fcb46e9440183fd278181deb501d2f0766d0f676d0cac84da3632590e2978cb6883bc4
Private key: 0x71a7f0e2ef1b7ff501b65a1650d48b8d5521fadc9539eec146d4faa6f5ca9aca

Sign a message

$ helpeth --password 'Use --password-prompt instead for security' --keyfile UTC--2016-03-17T19-06-57.064Z--15f2f3e0f2d74ea7b185fc12f24cb4f402cc96d0 signMessage 'Hello World'
Input message: Hello World
Message hash (Keccak): 0x592fa743889fc7f92ac2a37bb1f5ba1daf2a5c84741ca0e0061d243a2e6707ba
The signature: 0x167760997a69e225c0668e6761cd20cac70f3a6ace29fe2d287c3003daf6972b10d158a47e8f064cf982a3defdf236247c41249dbfb0fb81f0d126c26a94971d01

Sign a transaction

$ helpeth --password 'Use --password-prompt instead for security' --keyfile UTC--2016-03-17T19-06-57.064Z--15f2f3e0f2d74ea7b185fc12f24cb4f402cc96d0 createTx 0x1 0xe0defb92145fef3c3a945637705fafd3aa74a241 "1 eth" 0x0 21000 "20 Gwei"
Nonce: 0x1
To: 0xe0defb92145fef3c3a945637705fafd3aa74a241
Value: 0xde0b6b3a7640000
Data: 0x0
Gas limit: 0x5208
Gas price: 0x4a817c800
The signed transaction: 0xf86c018504a817c80082520894e0defb92145fef3c3a945637705fafd3aa74a241880de0b6b3a7640000001ba01893f2731799dc436da31e092f75bece7bfbdb4942b60b106d61ec06f143aed2a075548818010ccd7fd3e3dd6172f072d4dec19c8956c735bdd34b4aea809ff6be

Parse a transaction

$ ./helpeth parseTx 0xf86c018504a817c80082520894e0defb92145fef3c3a945637705fafd3aa74a241880de0b6b3a7640000001ba01893f2731799dc436da31e092f75bece7bfbdb4942b60b106d61ec06f143aed2a075548818010ccd7fd3e3dd6172f072d4dec19c8956c735bdd34b4aea809ff6be
Signed by: 0x15f2f3e0f2d74ea7b185fc12f24cb4f402cc96d0
Nonce: 0x01
To: 0xe0defb92145fef3c3a945637705fafd3aa74a241
Value: 1000000000000000000 (1 ETH)
Data: 0x00
Gas limit: 21000
Gas price: 20000000000 (20 Gwei)

License

MIT License

Copyright (C) 2016 Alex Beregszaszi