| 1 | const assert = require('nanoassert')
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| 2 | const Chacha20 = require('chacha20-universal')
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| 3 |
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| 4 | if (new Uint16Array([1])[0] !== 1) throw new Error('Big endian architecture is not supported.')
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| 5 |
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| 6 | exports.crypto_stream_chacha20_KEYBYTES = 32
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| 7 | exports.crypto_stream_chacha20_NONCEBYTES = 8
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| 8 | exports.crypto_stream_chacha20_MESSAGEBYTES_MAX = Number.MAX_SAFE_INTEGER
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| 9 |
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| 10 | exports.crypto_stream_chacha20_ietf_KEYBYTES = 32
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| 11 | exports.crypto_stream_chacha20_ietf_NONCEBYTES = 12
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| 12 | exports.crypto_stream_chacha20_ietf_MESSAGEBYTES_MAX = 2 ** 32
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| 13 |
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| 14 | exports.crypto_stream_chacha20 = function (c, n, k) {
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| 15 | c.fill(0)
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| 16 | exports.crypto_stream_chacha20_xor(c, c, n, k)
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| 17 | }
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| 18 |
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| 19 | exports.crypto_stream_chacha20_xor = function (c, m, n, k) {
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| 20 | assert(n.byteLength === exports.crypto_stream_chacha20_NONCEBYTES,
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| 21 | 'n should be crypto_stream_chacha20_NONCEBYTES')
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| 22 | assert(k.byteLength === exports.crypto_stream_chacha20_KEYBYTES,
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| 23 | 'k should be crypto_stream_chacha20_KEYBYTES')
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| 24 |
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| 25 | const xor = new Chacha20(n, k)
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| 26 | xor.update(c, m)
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| 27 | xor.final()
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| 28 | }
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| 29 |
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| 30 | exports.crypto_stream_chacha20_xor_ic = function (c, m, n, ic, k) {
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| 31 | assert(n.byteLength === exports.crypto_stream_chacha20_NONCEBYTES,
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| 32 | 'n should be crypto_stream_chacha20_NONCEBYTES')
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| 33 | assert(k.byteLength === exports.crypto_stream_chacha20_KEYBYTES,
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| 34 | 'k should be crypto_stream_chacha20_KEYBYTES')
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| 35 |
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| 36 | const xor = new Chacha20(n, k, ic)
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| 37 | xor.update(c, m)
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| 38 | xor.final()
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| 39 | }
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| 40 |
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| 41 | exports.crypto_stream_chacha20_xor_instance = function (n, k) {
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| 42 | assert(n.byteLength === exports.crypto_stream_chacha20_NONCEBYTES,
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| 43 | 'n should be crypto_stream_chacha20_NONCEBYTES')
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| 44 | assert(k.byteLength === exports.crypto_stream_chacha20_KEYBYTES,
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| 45 | 'k should be crypto_stream_chacha20_KEYBYTES')
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| 46 |
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| 47 | return new Chacha20(n, k)
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| 48 | }
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| 49 |
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| 50 | exports.crypto_stream_chacha20_ietf = function (c, n, k) {
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| 51 | c.fill(0)
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| 52 | exports.crypto_stream_chacha20_ietf_xor(c, c, n, k)
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| 53 | }
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| 54 |
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| 55 | exports.crypto_stream_chacha20_ietf_xor = function (c, m, n, k) {
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| 56 | assert(n.byteLength === exports.crypto_stream_chacha20_ietf_NONCEBYTES,
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| 57 | 'n should be crypto_stream_chacha20_ietf_NONCEBYTES')
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| 58 | assert(k.byteLength === exports.crypto_stream_chacha20_ietf_KEYBYTES,
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| 59 | 'k should be crypto_stream_chacha20_ietf_KEYBYTES')
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| 60 |
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| 61 | const xor = new Chacha20(n, k)
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| 62 | xor.update(c, m)
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| 63 | xor.final()
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| 64 | }
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| 65 |
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| 66 | exports.crypto_stream_chacha20_ietf_xor_ic = function (c, m, n, ic, k) {
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| 67 | assert(n.byteLength === exports.crypto_stream_chacha20_ietf_NONCEBYTES,
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| 68 | 'n should be crypto_stream_chacha20_ietf_NONCEBYTES')
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| 69 | assert(k.byteLength === exports.crypto_stream_chacha20_ietf_KEYBYTES,
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| 70 | 'k should be crypto_stream_chacha20_ietf_KEYBYTES')
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| 71 |
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| 72 | const xor = new Chacha20(n, k, ic)
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| 73 | xor.update(c, m)
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| 74 | xor.final()
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| 75 | }
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| 76 |
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| 77 | exports.crypto_stream_chacha20_ietf_xor_instance = function (n, k) {
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| 78 | assert(n.byteLength === exports.crypto_stream_chacha20_ietf_NONCEBYTES,
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| 79 | 'n should be crypto_stream_chacha20_ietf_NONCEBYTES')
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| 80 | assert(k.byteLength === exports.crypto_stream_chacha20_ietf_KEYBYTES,
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| 81 | 'k should be crypto_stream_chacha20_ietf_KEYBYTES')
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| 82 |
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| 83 | return new Chacha20(n, k)
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| 84 | }
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