var createHash = require('create-hash'); | |
module.exports = function (seed, len) { | |
var t = new Buffer(''); | |
var i = 0, c; | |
while (t.length < len) { | |
c = i2ops(i++); | |
t = Buffer.concat([t, createHash('sha1').update(seed).update(c).digest()]); | |
} | |
return t.slice(0, len); | |
}; | |
function i2ops(c) { | |
var out = new Buffer(4); | |
out.writeUInt32BE(c,0); | |
return out; | |
} |