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Simple proof of work concept using javascript
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| // Proof or work | |
| const difficulty = 3 | |
| async function sha256(message) { | |
| const msgBuffer = new TextEncoder().encode(message); | |
| const hashBuffer = await crypto.subtle.digest('SHA-256', msgBuffer); | |
| const hashArray = Array.from(new Uint8Array(hashBuffer)); | |
| const hashHex = hashArray.map(b => b.toString(16).padStart(2, '0')).join(''); | |
| return hashHex; | |
| } | |
| function convertBase(value, to_range) { | |
| const from_base = 10; | |
| const to_base = to_range.length; | |
| var from_range = "0123456789"; | |
| var dec_value = value.toString().split('').reverse().reduce(function (carry, digit, index) { | |
| if (from_range.indexOf(digit) === -1) throw new Error('Invalid digit `'+digit+'` for base '+from_base+'.'); | |
| return carry += from_range.indexOf(digit) * (Math.pow(from_base, index)); | |
| }, 0); | |
| var new_value = ''; | |
| while (dec_value > 0) { | |
| new_value = to_range[dec_value % to_base] + new_value; | |
| dec_value = (dec_value - (dec_value % to_base)) / to_base; | |
| } | |
| return new_value || '0'; | |
| } | |
| async function bruteforce(name) { | |
| let salt = ""; | |
| // Loop through all possible words until sha256(name + salt) === hash000... | |
| let symbols = [] | |
| for (let i = 32; i < 127; i++) { | |
| symbols.push(String.fromCharCode(i)) | |
| } | |
| let i = 0 | |
| while (true) { | |
| salt = convertBase(i, symbols) | |
| add = false; | |
| i++; | |
| const test = await sha256(name + salt); | |
| if (test.endsWith("0".repeat(difficulty))) { | |
| return salt; | |
| } | |
| } | |
| } |
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