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