106 lines
3.2 KiB
JavaScript
106 lines
3.2 KiB
JavaScript
const { crypto_hash_sha512 } = require('./crypto_hash')
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const { crypto_scalarmult, crypto_scalarmult_base } = require('./crypto_scalarmult')
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const { randombytes } = require('./randombytes')
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const { crypto_generichash_batch } = require('./crypto_generichash')
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const { crypto_secretbox_open_easy, crypto_secretbox_easy } = require('./crypto_secretbox')
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const xsalsa20 = require('xsalsa20')
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const assert = require('nanoassert')
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var crypto_box_PUBLICKEYBYTES = 32,
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crypto_box_SECRETKEYBYTES = 32,
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crypto_box_BEFORENMBYTES = 32,
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crypto_box_NONCEBYTES = 24,
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crypto_box_ZEROBYTES = 32,
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crypto_box_BOXZEROBYTES = 16,
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crypto_box_SEALBYTES = 48,
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crypto_box_SEEDBYTES = 32,
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crypto_box_BEFORENMBYTES = 32
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module.exports = {
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crypto_box_keypair,
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crypto_box_seed_keypair,
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crypto_box_seal,
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crypto_box_seal_open,
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crypto_box_PUBLICKEYBYTES,
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crypto_box_SECRETKEYBYTES,
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crypto_box_BEFORENMBYTES,
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crypto_box_NONCEBYTES,
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crypto_box_ZEROBYTES,
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crypto_box_BOXZEROBYTES,
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crypto_box_SEALBYTES,
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crypto_box_SEEDBYTES,
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crypto_box_BEFORENMBYTES
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}
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function crypto_box_keypair(pk, sk) {
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check(pk, crypto_box_PUBLICKEYBYTES)
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check(sk, crypto_box_SECRETKEYBYTES)
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randombytes(sk, 32)
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return crypto_scalarmult_base(pk, sk)
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}
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function crypto_box_seed_keypair(pk, sk, seed) {
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assert(pk.byteLength === crypto_box_PUBLICKEYBYTES, "pk should be 'crypto_box_PUBLICKEYBYTES' bytes")
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assert(sk.byteLength === crypto_box_SECRETKEYBYTES, "sk should be 'crypto_box_SECRETKEYBYTES' bytes")
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assert(sk.byteLength === crypto_box_SEEDBYTES, "sk should be 'crypto_box_SEEDBYTES' bytes")
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const hash = new Uint8Array(64)
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crypto_hash_sha512(hash, seed, 32)
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sk.set(hash.subarray(0, 32))
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hash.fill(0)
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return crypto_scalarmult_base(pk, sk)
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}
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function crypto_box_seal(c, m, pk) {
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check(c, crypto_box_SEALBYTES + m.length)
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check(pk, crypto_box_PUBLICKEYBYTES)
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var epk = c.subarray(0, crypto_box_PUBLICKEYBYTES)
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var esk = new Uint8Array(crypto_box_SECRETKEYBYTES)
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crypto_box_keypair(epk, esk)
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var n = new Uint8Array(crypto_box_NONCEBYTES)
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crypto_generichash_batch(n, [ epk, pk ])
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var s = new Uint8Array(crypto_box_PUBLICKEYBYTES)
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crypto_scalarmult(s, esk, pk)
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var k = new Uint8Array(crypto_box_BEFORENMBYTES)
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var zero = new Uint8Array(16)
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xsalsa20.core_hsalsa20(k, zero, s, xsalsa20.SIGMA)
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crypto_secretbox_easy(c.subarray(epk.length), m, n, k)
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cleanup(esk)
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}
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function crypto_box_seal_open(m, c, pk, sk) {
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check(c, crypto_box_SEALBYTES)
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check(m, c.length - crypto_box_SEALBYTES)
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check(pk, crypto_box_PUBLICKEYBYTES)
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check(sk, crypto_box_SECRETKEYBYTES)
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var epk = c.subarray(0, crypto_box_PUBLICKEYBYTES)
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var n = new Uint8Array(crypto_box_NONCEBYTES)
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crypto_generichash_batch(n, [ epk, pk ])
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var s = new Uint8Array(crypto_box_PUBLICKEYBYTES)
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crypto_scalarmult(s, sk, epk)
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var k = new Uint8Array(crypto_box_BEFORENMBYTES)
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var zero = new Uint8Array(16)
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xsalsa20.core_hsalsa20(k, zero, s, xsalsa20.SIGMA)
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return crypto_secretbox_open_easy(m, c.subarray(epk.length), n, k)
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}
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function check (buf, len) {
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if (!buf || (len && buf.length < len)) throw new Error('Argument must be a buffer' + (len ? ' of length ' + len : ''))
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}
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function cleanup(arr) {
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for (var i = 0; i < arr.length; i++) arr[i] = 0;
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}
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