[ethereum@netkiller web3.example]$ npm install keythereum
		
		

代码

		
var keyth=require('keythereum')
// Mac
// keystore = './Appdata/roaming/ethereum';
// Ubuntu 
// keystore = '~/.ethereum';
keystore = '../.ethereum';
var keyobj=keyth.importFromFile('0x372fda02e8a1eca513f2ee5901dc55b8b5dd7411',keystore)
var privateKey=keyth.recover('12345678',keyobj)
privateKey.toString('hex')
		
		

操作演示

		
> var keyth=require('keythereum')
undefined
> keystore = '../.ethereum';
'../.ethereum'
> var keyobj=keyth.importFromFile('0x372fda02e8a1eca513f2ee5901dc55b8b5dd7411',keystore)
undefined
> var privateKey=keyth.recover('12345678',keyobj)
undefined
> privateKey.toString('hex')
'f592b7bf06ca9fd7696ba95d6ed8e357de6a2379b6d5fe1ffd53c6b4b063cd4a'