caiguanhao / SignTx

Sign ethereum transaction with private key. (Make raw transaction). A shared object for other application to use.

SignTx

Sign transaction with private key.

go build -buildmode=c-shared -v -ldflags="-s -w" -o SignTx.so

Funcs

SignTxWithPrivKey(txJson, privKey string) (rawTx string)

txJson

{
    "nonce": 16,
    "gasPrice": 20000000000,
    "gas": 4000000,
    "to": "0x0000000000000000000000000000000000000000",
    "value": 1000000000000000000,
    "input": "SGVsbG8gV29ybGQh",
    "chainId": 123456
}

privKey

b0e565021eb427c1f71b810de4c8916ba478b5f6c9d339824c3e8b98f61762cb

rawTx (can be used in eth.sendRawTransaction)

0xf87c108504a817c800833d0900940000000000000000000000000000000000000000880de0b6b3
a76400008c48656c6c6f20576f726c64218303c4a4a0d956a764f81866d9b16d744cd0d513daeac0
a5831215a2d34ed9a0163b292462a05d78bfeaed709951333506f5043fdcb3b75ebecb4d35d64841
6149da37273f84

SignTxWithFixedPrivKey(txJson string) (rawTx string)

Run ./fixed.py to build with a fixed private key with max value per transaction.

Example

Python:

./fixed.py
Private Key (not echoed): b0e565021eb427c1f71b810de4c8916ba478b5f6c9d339824c3e8b98f61762cb
Max value in ether (0 means no limit): 1

python
>>> from ctypes import *; x = cdll.LoadLibrary('./SignTx.so').SignTxWithFixedPrivKey; x.argtypes = [ c_char_p ]; x.restype = c_char_p
>>> x('''
... {
...     "nonce": 16,
...     "gasPrice": 20000000000,
...     "gas": 4000000,
...     "to": "0x0000000000000000000000000000000000000000",
...     "value": 1000000000000000000,
...     "input": "SGVsbG8gV29ybGQh",
...     "chainId": 123456
... }
... ''')
'0xf87c108504a817c800833d0900940000000000000000000000000000000000000000880de0b6b3a76400008c48656c6c6f20576f726c64218303c4a4a0d956a764f81866d9b16d744cd0d513daeac0a5831215a2d34ed9a0163b292462a05d78bfeaed709951333506f5043fdcb3b75ebecb4d35d648416149da37273f84'
>>> x('{"value":1000000000000000001}')
'ERROR: exceeds max value'
>>> ^D