1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.// This module is browser compatible.
/** * Utilities for * {@link https://datatracker.ietf.org/doc/html/draft-msporny-base58-03 | base58} * encoding and decoding. * * This module is browser compatible. * * ```ts * import { encodeBase58, decodeBase58 } from "https://deno.land/std@$STD_VERSION/encoding/base58.ts"; * * const encoded = encodeBase58("Hello World!"); // "2NEpo7TZRRrLZSi2U" * * decodeBase58(encoded); * // Uint8Array(12) [ 72, 101, 108, 108, 111, 32,  87, 111, 114, 108, 100, 33 ] * ``` * * @module */
import { validateBinaryLike } from "./_util.ts";
// deno-fmt-ignoreconst mapBase58: Record<string, number> = {  "1": 0, "2": 1, "3": 2, "4": 3, "5": 4, "6": 5, "7": 6, "8": 7, "9": 8, A: 9,  B: 10, C: 11, D: 12, E: 13, F: 14, G: 15, H: 16, J: 17, K: 18, L: 19, M: 20,  N: 21, P: 22, Q: 23, R: 24, S: 25, T: 26, U: 27, V: 28, W: 29, X: 30, Y: 31,  Z: 32, a: 33, b: 34, c: 35, d: 36, e: 37, f: 38, g: 39, h: 40, i: 41, j: 42,  k: 43, m: 44, n: 45, o: 46, p: 47, q: 48, r: 49, s: 50, t: 51, u: 52, v: 53,  w: 54, x: 55, y: 56, z: 57};
const base58alphabet =  "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz".split("");
/** * Converts data into a base58-encoded string. * * @see {@link https://datatracker.ietf.org/doc/html/draft-msporny-base58-03#section-3} * * @param data The data to encode. * @returns The base58-encoded string. * * @example * ```ts * import { encodeBase58 } from "https://deno.land/std@$STD_VERSION/encoding/base58.ts"; * * encodeBase58("Hello World!"); // "2NEpo7TZRRrLZSi2U" * ``` */export function encodeBase58(data: ArrayBuffer | Uint8Array | string): string {  const uint8tData = validateBinaryLike(data);
  let length = 0;  let zeroes = 0;
  // Counting leading zeroes  let index = 0;  while (uint8tData[index] === 0) {    zeroes++;    index++;  }
  const notZeroUint8Data = uint8tData.slice(index);
  const size = Math.round((uint8tData.length * 138) / 100 + 1);  const b58Encoding: number[] = [];
  notZeroUint8Data.forEach((byte) => {    let i = 0;    let carry = byte;
    for (      let reverseIterator = size - 1;      (carry > 0 || i < length) && reverseIterator !== -1;      reverseIterator--, i++    ) {      carry += (b58Encoding[reverseIterator] || 0) * 256;      b58Encoding[reverseIterator] = Math.round(carry % 58);      carry = Math.floor(carry / 58);    }
    length = i;  });
  const strResult: string[] = Array.from({    length: b58Encoding.length + zeroes,  });
  if (zeroes > 0) {    strResult.fill("1", 0, zeroes);  }
  b58Encoding.forEach((byteValue) =>    strResult.push(base58alphabet[byteValue]!)  );
  return strResult.join("");}
/** * Decodes a base58-encoded string. * * @see {@link https://datatracker.ietf.org/doc/html/draft-msporny-base58-03#section-4} * * @param b58 The base58-encoded string to decode. * @returns The decoded data. * * @example * ```ts * import { decodeBase58 } from "https://deno.land/std@$STD_VERSION/encoding/base58.ts"; * * decodeBase58("2NEpo7TZRRrLZSi2U"); * // Uint8Array(12) [ 72, 101, 108, 108, 111, 32,  87, 111, 114, 108, 100, 33 ] * ``` */export function decodeBase58(b58: string): Uint8Array {  const splitInput = b58.trim().split("");
  let length = 0;  let ones = 0;
  // Counting leading ones  let index = 0;  while (splitInput[index] === "1") {    ones++;    index++;  }
  const notZeroData = splitInput.slice(index);
  const size = Math.round((b58.length * 733) / 1000 + 1);  const output: number[] = [];
  notZeroData.forEach((char, idx) => {    let carry = mapBase58[char];    let i = 0;
    if (carry === undefined) {      throw new Error(`Invalid base58 char at index ${idx} with value ${char}`);    }
    for (      let reverseIterator = size - 1;      (carry > 0 || i < length) && reverseIterator !== -1;      reverseIterator--, i++    ) {      carry += 58 * (output[reverseIterator] || 0);      output[reverseIterator] = Math.round(carry % 256);      carry = Math.floor(carry / 256);    }
    length = i;  });
  const validOutput = output.filter((item) => item !== undefined);
  if (ones > 0) {    const onesResult = Array.from({ length: ones }).fill(0, 0, ones);
    return new Uint8Array([...onesResult, ...validOutput] as number[]);  }
  return new Uint8Array(validOutput);}