aaac7fed
 liuqimichale
add
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var createHash = require('create-hash')
var Buffer = require('safe-buffer').Buffer
module.exports = function (seed, len) {
var t = Buffer.alloc(0)
var i = 0
var 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 = Buffer.allocUnsafe(4)
out.writeUInt32BE(c, 0)
return out
}
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