Ethereum: Base58 Encoding String in Java

Base58 encoding is a widely used method for encoding large data sets into compact and printable characters. In this article, we will explore how to Base58 encode a string in Java using the [Java 8 Base64 class]( .html).

Qualifications

  • Java 1.8 or later
  • A string that is encoded in Base58

Code

Ethereum: Java: Base58-encode String 

import java.nio.charset.StandardCharsets;
import java.util.Base64;
public class Main {
public static void main(String[] args) {
String testString = "56379c7bcd6b41188854e74169f844e8676cf8b8";
byte[] encodedBytes = encodeBase58(testString);
System.out.println("Encoded bytes: " + Base64.getEncoder().encodeToString(encodedBytes));
}
public static byte[] encodeBase58(string input) {
// Create a new Base64Encoder instance
Base64.Encoder encoder = Base64.getEncoder();
// Define the base 58 alphabet and padding pattern
Stringalphabet = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";
int paddingLength = 0;
// Loop until the input string is less than 1 byte
while (input.length() >= 1) {
// Append the next character to the encoded string
int i = 0;
while ((i < input.length()) && (input.charAt(i) <= alphabet.size())) {
encoder.update(input, i);
i++;
}
// Calculate the padding length if necessary
paddingLength = paddingLength + (input.length() - i);
// Add a padding character to the encoded string
String paddingChar = "=".repeat(paddinglength);
encodedBytes[i] = paddingChar.getBytes();
input = input.substring(i);
}
returns the encoded bytes;
}
}

Explanation

  • The EncodeBase58 method takes a string as input and returns a set of bytes.
  • We create a new instance of “Base64.Encoder” using the parameter “java.nio.charset.StandardCharsets.UTF_8”, which is the default encoding used by the Java Base64 class.
  • We define a base alphabet of 58 characters (“alphabet”) and a padding pattern (“paddingLength”).
  • We loop until the input string is less than 1 byte. At each iteration, we append the next character of the input string to the encoded string using “encoder.update(input, i)”.
  • If necessary, calculate the padding length by subtracting the current index from the total length of the input string, and append a repeated padding character (=) to the encoded string.
  • Finally, a set of bytes is returned.

Use Case Example

You can use this method in a Java program to encode strings for storage or transmission using Base58 encoding.

public class Example {
public static void main(String[] args) {
String testString = "Hello, world!";
byte [] encodedBytes = encodeBase58(teststring);
System.out.println("Encoded bytes: " + Base64.getEncoder().encodeToString(encodedBytes));
}
}

Note that this implementation does not support encoding large strings. If you need to handle long input strings, consider using a separate library or framework that supports efficient Base58 encoding and decoding, such as [OpenPGP]( or [Ethereum’s Web3.js](https ) :/ /web3js.readthedocs.io/en/v1.2.0/).

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