mirror of
https://github.com/sigmasternchen/axowall
synced 2025-03-15 08:38:55 +00:00
53 lines
1.5 KiB
JavaScript
53 lines
1.5 KiB
JavaScript
const hexCharset = "0123456789abcdef".split("");
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const suffixCharset = [
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"0123456789",
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"abcdefghijklmnopqrstuvwxyz",
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ",
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"+-",
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].flatMap(set => set.split(""));
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const suffixCharsetBits = 6;
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const sha256 = "SHA-256";
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Uint8Array.prototype.toHex = function() {
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return [...this].map(c => hexCharset[c >> 4] + hexCharset[c & 15]).join("");
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};
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Uint8Array.prototype.hasPrefix = function(array, bits) {
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for(let i = 0; i < array.length && i * 8 < bits; i++) {
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const bitsForByte = Math.min(8, bits - i * 8);
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const bitMask = ((1 << bitsForByte) - 1) << (8 - bitsForByte);
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if ((this[i] & bitMask) != (array[i] & bitMask)) {
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return false;
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}
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}
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return true;
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};
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async function digest(algo, input) {
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return new Uint8Array(await crypto.subtle.digest(algo, new TextEncoder().encode(input)));
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}
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function makeSuffix(index) {
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let result = "";
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while (index > 0) {
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result += suffixCharset[index & ((1 << suffixCharsetBits) - 1)];
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index >>= suffixCharsetBits;
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}
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return result;
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}
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async function findHashWithPrefix(hashPrefixBits, inputPrefix) {
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const hashPrefix = new Uint8Array(Array(Math.ceil(hashPrefixBits / 8)).map(c => 0));
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let iteration = 0;
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do {
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var message = inputPrefix + makeSuffix(iteration++)
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var hash = await digest(sha256, message);
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} while (!hash.hasPrefix(hashPrefix, hashPrefixBits));
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return message;
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}
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