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transatoshi
266
scripts/base58.js
Executable file
266
scripts/base58.js
Executable file
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// Use strict
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"use strict";
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// Classes
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// Base58 class
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class Base58 {
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// Public
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// Encode
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static encode(byteArray) {
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// Go through all leading zeros in the byte array
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var numberOfLeadingZeros = 0;
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while(numberOfLeadingZeros < byteArray["length"] && byteArray[numberOfLeadingZeros] === 0) {
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// Increment number of leading zeros
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++numberOfLeadingZeros;
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}
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// Get buffer size
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var bufferSize = Math.ceil((byteArray["length"] - numberOfLeadingZeros) * Base58.BYTES_PER_LENGTH_IN_NEW_BASE);
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// Create buffer
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var buffer = (new Uint8Array(bufferSize)).fill(0);
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// Go through all bytes in the byte array after the leading zeros
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var length = 0;
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for(var i = numberOfLeadingZeros; i < byteArray["length"]; ++i) {
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// Get byte
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var byte = byteArray[i];
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// Go through all base 58 components of the byte
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for(var j = 0, k = bufferSize - 1; (byte !== 0 || j < length) && k >= 0; ++j, --k) {
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// Include the current buffer value in the byte
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byte += (Common.BYTE_MAX_VALUE + 1) * buffer[k];
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// Set value in the buffer
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buffer[k] = byte % Base58.NUMBER_BASE;
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// Update the byte
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byte = Math.floor(byte / Base58.NUMBER_BASE);
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}
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// Update length
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length = j;
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}
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// Go through all leading zeros in the buffer
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var bufferIndex = bufferSize - length;
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while(bufferIndex < buffer["length"] && buffer[bufferIndex] === 0) {
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// Increment buffer index
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++bufferIndex;
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}
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// Set result to start with the number of leading zeros in base58
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var result = Base58.CHARACTERS[0].repeat(numberOfLeadingZeros);
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// Go through all bytes in the buffer after the leading zeros
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for(; bufferIndex < buffer["length"]; ++bufferIndex) {
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// Append buffer's value in base58 to the result
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result += Base58.CHARACTERS[buffer[bufferIndex]];
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}
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// Return result
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return result;
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}
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// Encode with checksum
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static encodeWithChecksum(byteArray) {
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// Get the checksum of the byte array
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var checksum = Base58.getChecksum(byteArray);
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// Return encoding the byte array with the checksum
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return Base58.encode(Common.mergeArrays([
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// Byte array
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byteArray,
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// Checksum
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checksum
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]));
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}
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// Decode
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static decode(base58String) {
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// Go through all leading zeros in base58 in the string
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var numberOfLeadingZeros = 0;
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while(numberOfLeadingZeros < base58String["length"] && base58String[numberOfLeadingZeros] === Base58.CHARACTERS[0]) {
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// Increment number of leading zeros
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++numberOfLeadingZeros;
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}
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// Get buffer size
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var bufferSize = Math.ceil((base58String["length"] - numberOfLeadingZeros) * Base58.BYTES_PER_LENGTH_IN_OLD_BASE);
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// Crete buffer
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var buffer = (new Uint8Array(bufferSize)).fill(0);
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// Go through all characters in the string after the leading zeros in base58
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var length = 0;
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for(var i = numberOfLeadingZeros; i < base58String["length"]; ++i) {
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// Get character as byte
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var byte = Base58.CHARACTERS.indexOf(base58String[i]);
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// Check if byte is invalid
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if(byte === Common.INDEX_NOT_FOUND) {
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// Throw error
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throw "Invalid base58 string.";
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}
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// Go through all base 58 components of the byte
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for(var j = 0, k = bufferSize - 1; (byte !== 0 || j < length) && k >= 0; ++j, --k) {
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// Include the current buffer value in the byte
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byte += Base58.NUMBER_BASE * buffer[k];
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// Set value in the buffer
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buffer[k] = byte % (Common.BYTE_MAX_VALUE + 1);
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// Update the byte
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byte = Math.floor(byte / (Common.BYTE_MAX_VALUE + 1));
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}
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// Update length
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length = j;
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}
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// Go through all leading zeros in the buffer
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var bufferIndex = bufferSize - length;
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while(bufferIndex < buffer["length"] && buffer[bufferIndex] === 0) {
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// Increment buffer index
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++bufferIndex;
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}
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// Set result to start with the number of leading zeros
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var result = (new Uint8Array(numberOfLeadingZeros + bufferSize - bufferIndex)).fill(0);
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// Go through all bytes in the buffer after the leading zeros
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for(var i = 0; bufferIndex < buffer["length"]; ++i, ++bufferIndex) {
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// Append buffer's value to the result
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result[i + numberOfLeadingZeros] += buffer[bufferIndex];
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}
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// Return result
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return result;
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}
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// Decode with checksum
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static decodeWithChecksum(base58String) {
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// Try
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try {
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// Decode the string
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var byteArray = Base58.decode(base58String);
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}
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// Catch errors
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catch(error) {
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// Throw error
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throw error;
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}
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// Check if the byte array doesn't include a checksum
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if(byteArray["length"] < Base58.CHECKSUM_LENGTH) {
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// Throw error
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throw "No checksum exists.";
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}
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// Otherwise
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else {
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// Get the checksum of the byte array without its checksum
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var checksum = Base58.getChecksum(byteArray.subarray(0, byteArray["length"] - Base58.CHECKSUM_LENGTH));
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// Get the provided checksum from the byte array
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var providedChecksum = byteArray.subarray(byteArray["length"] - Base58.CHECKSUM_LENGTH);
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// Check if checksums don't match
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if(Common.arraysAreEqual(checksum, providedChecksum) === false) {
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// Throw error
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throw "Invalid checksum.";
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}
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// Otherwise
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else {
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// Return byte array without the checksum
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return byteArray.subarray(0, byteArray["length"] - Base58.CHECKSUM_LENGTH);
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}
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}
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}
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// Private
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// Get checksum
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static getChecksum(byteArray) {
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// Get a hash of the hash of the byte array
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var hash = new Uint8Array(sha256.arrayBuffer(new Uint8Array(sha256.arrayBuffer(byteArray))));
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// Get the checksum from the hash
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var checksum = hash.subarray(0, Base58.CHECKSUM_LENGTH);
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// Return checksum
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return checksum;
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}
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// Characters
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static get CHARACTERS() {
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// Return characters
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return "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";
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}
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// Number base
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static get NUMBER_BASE() {
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// Return number base
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return 58;
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}
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// Bytes per length in new base
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static get BYTES_PER_LENGTH_IN_NEW_BASE() {
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// Return bytes per length in new base
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return Math.log(Common.BYTE_MAX_VALUE + 1) / Math.log(Base58.NUMBER_BASE);
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}
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// Bytes per length in old base
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static get BYTES_PER_LENGTH_IN_OLD_BASE() {
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// Return bytes per length in old base
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return Math.log(Base58.NUMBER_BASE) / Math.log(Common.BYTE_MAX_VALUE + 1);
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}
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// Checksum length
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static get CHECKSUM_LENGTH() {
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// Return checksum length
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return 4;
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}
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}
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// Main function
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// Set global object's base58
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globalThis["Base58"] = Base58;
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