91 lines
2.5 KiB
JavaScript
91 lines
2.5 KiB
JavaScript
importScripts('/static/deps/sjcl.min.js')
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function parametersfrombits(seed) {
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var out = sjcl.hash.sha512.hash(seed)
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return {
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'seed': seed,
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'key': sjcl.bitArray.bitSlice(out, 0, 256),
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'iv': sjcl.bitArray.bitSlice(out, 256, 384),
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'ident': sjcl.bitArray.bitSlice(out, 384, 512)
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}
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}
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function parameters(seed) {
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if (typeof seed == 'string') {
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seed = sjcl.codec.base64url.toBits(seed)
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} else {
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seed = sjcl.codec.bytes.toBits(seed)
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}
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return parametersfrombits(seed)
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}
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function encrypt(file, seed, id) {
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var params = parameters(seed)
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var uarr = new Uint8Array(file)
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var before = sjcl.codec.bytes.toBits(uarr)
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var prp = new sjcl.cipher.aes(params.key)
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var after = sjcl.mode.ccm.encrypt(prp, before, params.iv)
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var afterarray = new Uint8Array(sjcl.codec.bytes.fromBits(after))
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postMessage({
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'id': id,
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'seed': sjcl.codec.base64url.fromBits(params.seed),
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'ident': sjcl.codec.base64url.fromBits(params.ident),
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'encrypted': new Blob([afterarray], { type: 'application/octet-stream' })
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})
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}
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function decrypt(file, seed, id) {
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var params = parameters(seed)
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var uarr = new Uint8Array(file)
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var before = sjcl.codec.bytes.toBits(uarr);
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var prp = new sjcl.cipher.aes(params.key);
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var after = sjcl.mode.ccm.decrypt(prp, before, params.iv);
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var afterarray = new Uint8Array(sjcl.codec.bytes.fromBits(after));
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var header = ''
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var headerview = new DataView(afterarray.buffer)
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var i = 0;
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for (; ; i++) {
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var num = headerview.getUint16(i * 2, false)
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if (num == 0) {
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break;
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}
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header += String.fromCharCode(num);
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}
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var header = JSON.parse(header)
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var data = new Blob([afterarray])
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postMessage({
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'id': id,
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'ident': sjcl.codec.base64url.fromBits(params.ident),
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'header': header,
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'decrypted': data.slice((i * 2) + 2, data.size, header.mime)
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})
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}
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function ident(seed, id) {
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var params = parameters(seed)
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postMessage({
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'id': id,
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'ident': sjcl.codec.base64url.fromBits(params.ident)
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})
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}
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onmessage = function (e) {
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if (e.data.action == 'decrypt') {
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decrypt(e.data.data, e.data.seed, e.data.id)
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} else if (e.data.action == 'ident') {
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ident(e.data.seed, e.data.id);
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} else {
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sjcl.random.addEntropy(e.data.entropy, 2048, 'runtime')
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encrypt(e.data.data, e.data.seed, e.data.id)
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}
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}
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