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d6e10060fb
commit
626888fbd9
3 changed files with 43 additions and 41 deletions
18
src/content.js
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18
src/content.js
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@ -0,0 +1,18 @@
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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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export 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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23
src/hash.js
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23
src/hash.js
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const hexCharset = "0123456789abcdef".split("");
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export 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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export 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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43
src/main.js
43
src/main.js
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@ -1,44 +1,5 @@
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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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import {makeSuffix} from "./content";
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import {digest, sha256} from "./hash";
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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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