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module: crypto_box

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This commit is contained in:
Christophe Diederichs 2020-05-04 21:12:44 +02:00
parent 5dd22a0957
commit 6a9696c86f
2 changed files with 77 additions and 70 deletions
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77
crypto_box.js Normal file
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@ -0,0 +1,77 @@
module.exports = {
crypto_box_keypair,
crypto_box_seal,
crypto_box_seal_open,
crypto_box_PUBLICKEYBYTES,
crypto_box_SECRETKEYBYTES,
crypto_box_BEFORENMBYTES,
crypto_box_NONCEBYTES,
crypto_box_ZEROBYTES,
crypto_box_BOXZEROBYTES,
crypto_box_SEALBYTES,
crypto_box_BEFORENMBYTES
}
function crypto_box_keypair(pk, sk) {
check(pk, crypto_box_PUBLICKEYBYTES)
check(sk, crypto_box_SECRETKEYBYTES)
randombytes(sk, 32)
return crypto_scalarmult_base(pk, sk)
}
function crypto_box_seal(c, m, pk) {
check(c, crypto_box_SEALBYTES + m.length)
check(pk, crypto_box_PUBLICKEYBYTES)
var epk = c.subarray(0, crypto_box_PUBLICKEYBYTES)
var esk = new Uint8Array(crypto_box_SECRETKEYBYTES)
crypto_box_keypair(epk, esk)
var n = new Uint8Array(crypto_box_NONCEBYTES)
sodium.crypto_generichash_batch(n, [ epk, pk ])
var s = new Uint8Array(crypto_box_PUBLICKEYBYTES)
crypto_scalarmult(s, esk, pk)
var k = new Uint8Array(crypto_box_BEFORENMBYTES)
var zero = new Uint8Array(16)
xsalsa20.core_hsalsa20(k, zero, s, xsalsa20.SIGMA)
crypto_secretbox_easy(c.subarray(epk.length), m, n, k)
cleanup(esk)
}
function crypto_box_seal_open(m, c, pk, sk) {
check(c, crypto_box_SEALBYTES)
check(m, c.length - crypto_box_SEALBYTES)
check(pk, crypto_box_PUBLICKEYBYTES)
check(sk, crypto_box_SECRETKEYBYTES)
var epk = c.subarray(0, crypto_box_PUBLICKEYBYTES)
var n = new Uint8Array(crypto_box_NONCEBYTES)
sodium.crypto_generichash_batch(n, [ epk, pk ])
var s = new Uint8Array(crypto_box_PUBLICKEYBYTES)
crypto_scalarmult(s, sk, epk)
var k = new Uint8Array(crypto_box_BEFORENMBYTES)
var zero = new Uint8Array(16)
xsalsa20.core_hsalsa20(k, zero, s, xsalsa20.SIGMA)
return crypto_secretbox_open_easy(m, c.subarray(epk.length), n, k)
}
function check (buf, len) {
if (!buf || (len && buf.length < len)) throw new Error('Argument must be a buffer' + (len ? ' of length ' + len : ''))
}
var crypto_box_PUBLICKEYBYTES = 32,
crypto_box_SECRETKEYBYTES = 32,
crypto_box_BEFORENMBYTES = 32,
crypto_box_NONCEBYTES = 24,
crypto_box_ZEROBYTES = 32,
crypto_box_BOXZEROBYTES = 16,
crypto_box_SEALBYTES = 48,
crypto_box_BEFORENMBYTES = 32

70
index.js
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@ -13,68 +13,6 @@ var sodium = module.exports
// also forwarded at the bottom but randombytes is non-enumerable // also forwarded at the bottom but randombytes is non-enumerable
var randombytes = require('./randombytes').randombytes var randombytes = require('./randombytes').randombytes
function crypto_box_keypair(pk, sk) {
check(pk, crypto_box_PUBLICKEYBYTES)
check(sk, crypto_box_SECRETKEYBYTES)
randombytes(sk, 32)
return crypto_scalarmult_base(pk, sk)
}
function crypto_box_seal(c, m, pk) {
check(c, crypto_box_SEALBYTES + m.length)
check(pk, crypto_box_PUBLICKEYBYTES)
var epk = c.subarray(0, crypto_box_PUBLICKEYBYTES)
var esk = new Uint8Array(crypto_box_SECRETKEYBYTES)
crypto_box_keypair(epk, esk)
var n = new Uint8Array(crypto_box_NONCEBYTES)
sodium.crypto_generichash_batch(n, [ epk, pk ])
var s = new Uint8Array(crypto_box_PUBLICKEYBYTES)
crypto_scalarmult(s, esk, pk)
var k = new Uint8Array(crypto_box_BEFORENMBYTES)
var zero = new Uint8Array(16)
xsalsa20.core_hsalsa20(k, zero, s, xsalsa20.SIGMA)
crypto_secretbox_easy(c.subarray(epk.length), m, n, k)
cleanup(esk)
}
function crypto_box_seal_open(m, c, pk, sk) {
check(c, crypto_box_SEALBYTES)
check(m, c.length - crypto_box_SEALBYTES)
check(pk, crypto_box_PUBLICKEYBYTES)
check(sk, crypto_box_SECRETKEYBYTES)
var epk = c.subarray(0, crypto_box_PUBLICKEYBYTES)
var n = new Uint8Array(crypto_box_NONCEBYTES)
sodium.crypto_generichash_batch(n, [ epk, pk ])
var s = new Uint8Array(crypto_box_PUBLICKEYBYTES)
crypto_scalarmult(s, sk, epk)
var k = new Uint8Array(crypto_box_BEFORENMBYTES)
var zero = new Uint8Array(16)
xsalsa20.core_hsalsa20(k, zero, s, xsalsa20.SIGMA)
return crypto_secretbox_open_easy(m, c.subarray(epk.length), n, k)
}
crypto_box_PUBLICKEYBYTES = 32,
crypto_box_SECRETKEYBYTES = 32,
crypto_box_BEFORENMBYTES = 32,
crypto_box_NONCEBYTES = crypto_secretbox_NONCEBYTES,
crypto_box_ZEROBYTES = crypto_secretbox_ZEROBYTES,
crypto_box_BOXZEROBYTES = crypto_secretbox_BOXZEROBYTES,
crypto_box_SEALBYTES = 48,
crypto_box_BEFORENMBYTES = 32,
sodium.memzero = function (len, offset) { sodium.memzero = function (len, offset) {
for (var i = offset; i < len; i++) arr[i] = 0; for (var i = offset; i < len; i++) arr[i] = 0;
} }
@ -88,14 +26,6 @@ forward(require('./crypto_stream'))
sodium.crypto_box_PUBLICKEYBYTES = crypto_box_PUBLICKEYBYTES
sodium.crypto_box_SECRETKEYBYTES = crypto_box_SECRETKEYBYTES
sodium.crypto_box_SEALBYTES = crypto_box_SEALBYTES
sodium.crypto_box_BEFORENMBYTES = crypto_box_BEFORENMBYTES
sodium.crypto_box_keypair = crypto_box_keypair
sodium.crypto_box_seal = crypto_box_seal
sodium.crypto_box_seal_open = crypto_box_seal_open
sodium.sodium_malloc = function (n) { sodium.sodium_malloc = function (n) {
return new Uint8Array(n) return new Uint8Array(n)
} }