38 lines
864 B
JavaScript
38 lines
864 B
JavaScript
/* eslint-disable camelcase */
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const xsalsa20 = require('xsalsa20')
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if (new Uint16Array([1])[0] !== 1) throw new Error('Big endian architecture is not supported.')
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exports.crypto_stream_KEYBYTES = 32
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exports.crypto_stream_NONCEBYTES = 24
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exports.crypto_stream_PRIMITIVE = 'xsalsa20'
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exports.crypto_stream = function (c, nonce, key) {
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c.fill(0)
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exports.crypto_stream_xor(c, c, nonce, key)
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}
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exports.crypto_stream_xor = function (c, m, nonce, key) {
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const xor = xsalsa20(nonce, key)
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xor.update(m, c)
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xor.final()
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}
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exports.crypto_stream_xor_instance = function (nonce, key) {
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return new XOR(nonce, key)
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}
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function XOR (nonce, key) {
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this._instance = xsalsa20(nonce, key)
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}
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XOR.prototype.update = function (out, inp) {
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this._instance.update(inp, out)
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}
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XOR.prototype.final = function () {
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this._instance.finalize()
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this._instance = null
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}
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