272 lines
11 KiB
JavaScript
272 lines
11 KiB
JavaScript
/* eslint-disable camelcase */
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const assert = require('nanoassert')
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const { randombytes_buf } = require('./randombytes')
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const {
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crypto_stream_chacha20_ietf,
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crypto_stream_chacha20_ietf_xor,
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crypto_stream_chacha20_ietf_xor_ic,
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crypto_stream_chacha20_ietf_KEYBYTES
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} = require('./crypto_stream_chacha20')
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const { crypto_core_hchacha20, crypto_core_hchacha20_INPUTBYTES } = require('./internal/hchacha20')
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const Poly1305 = require('./internal/poly1305')
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const { sodium_increment, sodium_is_zero, sodium_memcmp } = require('./helpers')
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const crypto_onetimeauth_poly1305_BYTES = 16
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const crypto_secretstream_xchacha20poly1305_COUNTERBYTES = 4
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const crypto_secretstream_xchacha20poly1305_INONCEBYTES = 8
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const crypto_aead_xchacha20poly1305_ietf_KEYBYTES = 32
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const crypto_secretstream_xchacha20poly1305_KEYBYTES = crypto_aead_xchacha20poly1305_ietf_KEYBYTES
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const crypto_aead_xchacha20poly1305_ietf_NPUBBYTES = 24
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const crypto_secretstream_xchacha20poly1305_HEADERBYTES = crypto_aead_xchacha20poly1305_ietf_NPUBBYTES
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const crypto_aead_xchacha20poly1305_ietf_ABYTES = 16
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const crypto_secretstream_xchacha20poly1305_ABYTES = 1 + crypto_aead_xchacha20poly1305_ietf_ABYTES
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const crypto_secretstream_xchacha20poly1305_MESSAGEBYTES_MAX = Number.MAX_SAFE_INTEGER
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const crypto_aead_chacha20poly1305_ietf_MESSAGEBYTES_MAX = Number.MAX_SAFE_INTEGER
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const crypto_secretstream_xchacha20poly1305_TAGBYTES = 1
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const crypto_secretstream_xchacha20poly1305_TAG_MESSAGE = new Uint8Array([0])
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const crypto_secretstream_xchacha20poly1305_TAG_PUSH = new Uint8Array([1])
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const crypto_secretstream_xchacha20poly1305_TAG_REKEY = new Uint8Array([2])
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const crypto_secretstream_xchacha20poly1305_TAG_FINAL = new Uint8Array([crypto_secretstream_xchacha20poly1305_TAG_PUSH | crypto_secretstream_xchacha20poly1305_TAG_REKEY])
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const crypto_secretstream_xchacha20poly1305_STATEBYTES = crypto_secretstream_xchacha20poly1305_KEYBYTES +
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crypto_secretstream_xchacha20poly1305_INONCEBYTES + crypto_secretstream_xchacha20poly1305_COUNTERBYTES + 8
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const KEY_OFFSET = 0
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const NONCE_OFFSET = crypto_secretstream_xchacha20poly1305_KEYBYTES
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const PAD_OFFSET = NONCE_OFFSET + crypto_secretstream_xchacha20poly1305_INONCEBYTES + crypto_secretstream_xchacha20poly1305_COUNTERBYTES
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const _pad0 = new Uint8Array(16)
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function STORE64_LE (dest, int) {
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let mul = 1
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let i = 0
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dest[0] = int & 0xFF
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while (++i < 8 && (mul *= 0x100)) {
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dest[i] = (int / mul) & 0xFF
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}
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}
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function crypto_secretstream_xchacha20poly1305_counter_reset (state) {
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assert(state.byteLength === crypto_secretstream_xchacha20poly1305_STATEBYTES,
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'state is should be crypto_secretstream_xchacha20poly1305_STATEBYTES long')
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const nonce = state.subarray(NONCE_OFFSET, PAD_OFFSET)
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for (let i = 0; i < crypto_secretstream_xchacha20poly1305_COUNTERBYTES; i++) {
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nonce[i] = 0
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}
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nonce[0] = 1
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}
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function crypto_secretstream_xchacha20poly1305_keygen (k) {
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assert(k.length === crypto_secretstream_xchacha20poly1305_KEYBYTES)
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randombytes_buf(k)
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}
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function crypto_secretstream_xchacha20poly1305_init_push (state, out, key) {
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assert(state.byteLength === crypto_secretstream_xchacha20poly1305_STATEBYTES,
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'state is should be crypto_secretstream_xchacha20poly1305_STATEBYTES long')
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assert(out instanceof Uint8Array && out.length === crypto_secretstream_xchacha20poly1305_HEADERBYTES, 'out not byte array of length crypto_secretstream_xchacha20poly1305_HEADERBYTES')
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assert(key instanceof Uint8Array && key.length === crypto_secretstream_xchacha20poly1305_KEYBYTES, 'key not byte array of length crypto_secretstream_xchacha20poly1305_KEYBYTES')
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const k = state.subarray(KEY_OFFSET, NONCE_OFFSET)
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const nonce = state.subarray(NONCE_OFFSET, PAD_OFFSET)
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const pad = state.subarray(PAD_OFFSET)
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randombytes_buf(out, crypto_secretstream_xchacha20poly1305_HEADERBYTES)
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crypto_core_hchacha20(k, out, key, null)
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crypto_secretstream_xchacha20poly1305_counter_reset(state)
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for (let i = 0; i < crypto_secretstream_xchacha20poly1305_INONCEBYTES; i++) {
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nonce[i + crypto_secretstream_xchacha20poly1305_COUNTERBYTES] = out[i + crypto_core_hchacha20_INPUTBYTES]
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}
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pad.fill(0)
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}
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function crypto_secretstream_xchacha20poly1305_init_pull (state, _in, key) {
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assert(state.byteLength === crypto_secretstream_xchacha20poly1305_STATEBYTES,
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'state is should be crypto_secretstream_xchacha20poly1305_STATEBYTES long')
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assert(_in instanceof Uint8Array && _in.length === crypto_secretstream_xchacha20poly1305_HEADERBYTES,
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'_in not byte array of length crypto_secretstream_xchacha20poly1305_HEADERBYTES')
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assert(key instanceof Uint8Array && key.length === crypto_secretstream_xchacha20poly1305_KEYBYTES,
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'key not byte array of length crypto_secretstream_xchacha20poly1305_KEYBYTES')
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const k = state.subarray(KEY_OFFSET, NONCE_OFFSET)
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const nonce = state.subarray(NONCE_OFFSET, PAD_OFFSET)
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const pad = state.subarray(PAD_OFFSET)
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crypto_core_hchacha20(k, _in, key, null)
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crypto_secretstream_xchacha20poly1305_counter_reset(state)
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for (let i = 0; i < crypto_secretstream_xchacha20poly1305_INONCEBYTES; i++) {
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nonce[i + crypto_secretstream_xchacha20poly1305_COUNTERBYTES] = _in[i + crypto_core_hchacha20_INPUTBYTES]
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}
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pad.fill(0)
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}
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function crypto_secretstream_xchacha20poly1305_rekey (state) {
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assert(state.byteLength === crypto_secretstream_xchacha20poly1305_STATEBYTES,
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'state is should be crypto_secretstream_xchacha20poly1305_STATEBYTES long')
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const k = state.subarray(KEY_OFFSET, NONCE_OFFSET)
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const nonce = state.subarray(NONCE_OFFSET, PAD_OFFSET)
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const new_key_and_inonce = new Uint8Array(
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crypto_stream_chacha20_ietf_KEYBYTES + crypto_secretstream_xchacha20poly1305_INONCEBYTES)
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let i
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for (i = 0; i < crypto_stream_chacha20_ietf_KEYBYTES; i++) {
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new_key_and_inonce[i] = k[i]
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}
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for (i = 0; i < crypto_secretstream_xchacha20poly1305_INONCEBYTES; i++) {
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new_key_and_inonce[crypto_stream_chacha20_ietf_KEYBYTES + i] =
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nonce[crypto_secretstream_xchacha20poly1305_COUNTERBYTES + i]
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}
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crypto_stream_chacha20_ietf_xor(new_key_and_inonce, new_key_and_inonce, nonce, k)
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for (i = 0; i < crypto_stream_chacha20_ietf_KEYBYTES; i++) {
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k[i] = new_key_and_inonce[i]
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}
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for (i = 0; i < crypto_secretstream_xchacha20poly1305_INONCEBYTES; i++) {
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nonce[crypto_secretstream_xchacha20poly1305_COUNTERBYTES + i] =
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new_key_and_inonce[crypto_stream_chacha20_ietf_KEYBYTES + i]
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}
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crypto_secretstream_xchacha20poly1305_counter_reset(state)
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}
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function crypto_secretstream_xchacha20poly1305_push (state, out, m, ad, tag) {
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assert(state.byteLength === crypto_secretstream_xchacha20poly1305_STATEBYTES,
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'state is should be crypto_secretstream_xchacha20poly1305_STATEBYTES long')
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if (!ad) ad = new Uint8Array(0)
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const k = state.subarray(KEY_OFFSET, NONCE_OFFSET)
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const nonce = state.subarray(NONCE_OFFSET, PAD_OFFSET)
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const block = new Uint8Array(64)
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const slen = new Uint8Array(8)
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assert(crypto_secretstream_xchacha20poly1305_MESSAGEBYTES_MAX <=
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crypto_aead_chacha20poly1305_ietf_MESSAGEBYTES_MAX)
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crypto_stream_chacha20_ietf(block, nonce, k)
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const poly = new Poly1305(block)
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block.fill(0)
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poly.update(ad, 0, ad.byteLength)
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poly.update(_pad0, 0, (0x10 - ad.byteLength) & 0xf)
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block[0] = tag[0]
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crypto_stream_chacha20_ietf_xor_ic(block, block, nonce, 1, k)
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poly.update(block, 0, block.byteLength)
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out[0] = block[0]
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const c = out.subarray(1, out.byteLength)
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crypto_stream_chacha20_ietf_xor_ic(c, m, nonce, 2, k)
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poly.update(c, 0, m.byteLength)
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poly.update(_pad0, 0, (0x10 - block.byteLength + m.byteLength) & 0xf)
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STORE64_LE(slen, ad.byteLength)
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poly.update(slen, 0, slen.byteLength)
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STORE64_LE(slen, block.byteLength + m.byteLength)
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poly.update(slen, 0, slen.byteLength)
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const mac = out.subarray(1 + m.byteLength, out.byteLength)
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poly.finish(mac, 0)
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assert(crypto_onetimeauth_poly1305_BYTES >=
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crypto_secretstream_xchacha20poly1305_INONCEBYTES)
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xor_buf(nonce.subarray(crypto_secretstream_xchacha20poly1305_COUNTERBYTES, nonce.length),
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mac, crypto_secretstream_xchacha20poly1305_INONCEBYTES)
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sodium_increment(nonce)
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if ((tag[0] & crypto_secretstream_xchacha20poly1305_TAG_REKEY) !== 0 ||
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sodium_is_zero(nonce.subarray(0, crypto_secretstream_xchacha20poly1305_COUNTERBYTES))) {
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crypto_secretstream_xchacha20poly1305_rekey(state)
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}
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return crypto_secretstream_xchacha20poly1305_ABYTES + m.byteLength
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}
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function crypto_secretstream_xchacha20poly1305_pull (state, m, tag, _in, ad) {
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assert(state.byteLength === crypto_secretstream_xchacha20poly1305_STATEBYTES,
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'state is should be crypto_secretstream_xchacha20poly1305_STATEBYTES long')
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if (!ad) ad = new Uint8Array(0)
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const k = state.subarray(KEY_OFFSET, NONCE_OFFSET)
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const nonce = state.subarray(NONCE_OFFSET, PAD_OFFSET)
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const block = new Uint8Array(64)
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const slen = new Uint8Array(8)
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const mac = new Uint8Array(crypto_onetimeauth_poly1305_BYTES)
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assert(_in.byteLength >= crypto_secretstream_xchacha20poly1305_ABYTES,
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'ciphertext is too short.')
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const mlen = _in.byteLength - crypto_secretstream_xchacha20poly1305_ABYTES
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crypto_stream_chacha20_ietf(block, nonce, k)
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const poly = new Poly1305(block)
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block.fill(0) // sodium_memzero(block, sizeof block);
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poly.update(ad, 0, ad.byteLength)
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poly.update(_pad0, 0, (0x10 - ad.byteLength) & 0xf)
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block.fill(0) // memset(block, 0, sizeof block);
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block[0] = _in[0]
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crypto_stream_chacha20_ietf_xor_ic(block, block, nonce, 1, k)
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tag[0] = block[0]
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block[0] = _in[0]
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poly.update(block, 0, block.byteLength)
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const c = _in.subarray(1, _in.length)
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poly.update(c, 0, mlen)
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poly.update(_pad0, 0, (0x10 - block.byteLength + mlen) & 0xf)
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STORE64_LE(slen, ad.byteLength)
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poly.update(slen, 0, slen.byteLength)
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STORE64_LE(slen, block.byteLength + m.byteLength)
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poly.update(slen, 0, slen.byteLength)
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poly.finish(mac, 0)
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const stored_mac = _in.subarray(1 + mlen, _in.length)
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if (!sodium_memcmp(mac, stored_mac)) {
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mac.fill(0)
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throw new Error('MAC could not be verified.')
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}
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crypto_stream_chacha20_ietf_xor_ic(m, c.subarray(0, m.length), nonce, 2, k)
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xor_buf(nonce.subarray(crypto_secretstream_xchacha20poly1305_COUNTERBYTES, nonce.length),
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mac, crypto_secretstream_xchacha20poly1305_INONCEBYTES)
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sodium_increment(nonce)
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if ((tag & crypto_secretstream_xchacha20poly1305_TAG_REKEY) !== 0 ||
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sodium_is_zero(nonce.subarray(0, crypto_secretstream_xchacha20poly1305_COUNTERBYTES))) {
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crypto_secretstream_xchacha20poly1305_rekey(state)
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}
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return mlen
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}
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function xor_buf (out, _in, n) {
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for (let i = 0; i < n; i++) {
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out[i] ^= _in[i]
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}
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}
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module.exports = {
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crypto_secretstream_xchacha20poly1305_keygen,
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crypto_secretstream_xchacha20poly1305_init_push,
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crypto_secretstream_xchacha20poly1305_init_pull,
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crypto_secretstream_xchacha20poly1305_rekey,
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crypto_secretstream_xchacha20poly1305_push,
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crypto_secretstream_xchacha20poly1305_pull,
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crypto_secretstream_xchacha20poly1305_STATEBYTES,
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crypto_secretstream_xchacha20poly1305_ABYTES,
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crypto_secretstream_xchacha20poly1305_HEADERBYTES,
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crypto_secretstream_xchacha20poly1305_KEYBYTES,
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crypto_secretstream_xchacha20poly1305_MESSAGEBYTES_MAX,
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crypto_secretstream_xchacha20poly1305_TAGBYTES,
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crypto_secretstream_xchacha20poly1305_TAG_MESSAGE,
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crypto_secretstream_xchacha20poly1305_TAG_PUSH,
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crypto_secretstream_xchacha20poly1305_TAG_REKEY,
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crypto_secretstream_xchacha20poly1305_TAG_FINAL
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}
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