anproto -- authenticated non-networked protocol or another proto
sha256 blobs signed with ed25519 keypairs
anproto.com
evbogue.com
ed25519
social
protocols
1// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
2// This module is browser compatible.
3
4const base64abc = [
5 "A",
6 "B",
7 "C",
8 "D",
9 "E",
10 "F",
11 "G",
12 "H",
13 "I",
14 "J",
15 "K",
16 "L",
17 "M",
18 "N",
19 "O",
20 "P",
21 "Q",
22 "R",
23 "S",
24 "T",
25 "U",
26 "V",
27 "W",
28 "X",
29 "Y",
30 "Z",
31 "a",
32 "b",
33 "c",
34 "d",
35 "e",
36 "f",
37 "g",
38 "h",
39 "i",
40 "j",
41 "k",
42 "l",
43 "m",
44 "n",
45 "o",
46 "p",
47 "q",
48 "r",
49 "s",
50 "t",
51 "u",
52 "v",
53 "w",
54 "x",
55 "y",
56 "z",
57 "0",
58 "1",
59 "2",
60 "3",
61 "4",
62 "5",
63 "6",
64 "7",
65 "8",
66 "9",
67 "+",
68 "/",
69];
70
71/**
72 * CREDIT: https://gist.github.com/enepomnyaschih/72c423f727d395eeaa09697058238727
73 * Encodes a given Uint8Array, ArrayBuffer or string into RFC4648 base64 representation
74 * @param data
75 */
76export function encode(data) {
77 const uint8 = typeof data === "string"
78 ? new TextEncoder().encode(data)
79 : data instanceof Uint8Array
80 ? data
81 : new Uint8Array(data);
82 let result = "",
83 i;
84 const l = uint8.length;
85 for (i = 2; i < l; i += 3) {
86 result += base64abc[uint8[i - 2] >> 2];
87 result += base64abc[((uint8[i - 2] & 0x03) << 4) | (uint8[i - 1] >> 4)];
88 result += base64abc[((uint8[i - 1] & 0x0f) << 2) | (uint8[i] >> 6)];
89 result += base64abc[uint8[i] & 0x3f];
90 }
91 if (i === l + 1) {
92 // 1 octet yet to write
93 result += base64abc[uint8[i - 2] >> 2];
94 result += base64abc[(uint8[i - 2] & 0x03) << 4];
95 result += "==";
96 }
97 if (i === l) {
98 // 2 octets yet to write
99 result += base64abc[uint8[i - 2] >> 2];
100 result += base64abc[((uint8[i - 2] & 0x03) << 4) | (uint8[i - 1] >> 4)];
101 result += base64abc[(uint8[i - 1] & 0x0f) << 2];
102 result += "=";
103 }
104 return result;
105}
106
107/**
108 * Decodes a given RFC4648 base64 encoded string
109 * @param b64
110 */
111export function decode(b64) {
112 const binString = atob(b64);
113 const size = binString.length;
114 const bytes = new Uint8Array(size);
115 for (let i = 0; i < size; i++) {
116 bytes[i] = binString.charCodeAt(i);
117 }
118 return bytes;
119}