Understand the core principle of the BASE58 coding framework in the Java class library
Core principle:
The Base58 codec frame is a tool for encoding the data commonly used in Java. Among themEssence
The core principle of Base58 codec is as follows:
1. Define Base58 character set: base58 encoding uses 58 characters as encoding character sets.These character sets are usually composed of numbers, letters, and some special symbols. For example, the Base58 character set in Bitcoin is "123456789abcdefghjklmnpqrstuvwxyzabcdefghijkmnopqrstuvwxyz".
2. Convert the data to be encoded to a large integer: First, the data to be encoded is converted into a large integer.This can be implemented by converting data to binary representations, and then binary to integer.
3. Perform base58 coding on the large integer: Use the defined Base58 character set to convert the large integer into a base58 coding string.This is usually implemented by executing method and molding operations on the large integer, stitching the characters corresponding to the Base58 character set, and a string encoded by Base58.
4. Decoding the strings encoded by Base58: Convert the string of Base58 to a large integer.This can be reverse by each character in the base58 coding string, multiplied by the corresponding weight value of the corresponding character, and accumulated the result to achieve it.
5. Convert a large integer back to the original data: the large integer conversion obtained by decoding back to the original data format.This is usually implemented by converting large integers to binary representations, and then transforming binary into the required data types according to specific needs.
Example code:
The following is an example code related to core principles using Base58 coding in the Java library:
import java.math.BigInteger;
public class Base58Codec {
private static final String BASE58_CHARACTERS = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz";
public static String encode(byte[] data) {
BigInteger number = new BigInteger(1, data);
StringBuilder encoded = new StringBuilder();
while (number.compareTo(BigInteger.ZERO) > 0) {
BigInteger[] divmod = number.divideAndRemainder(BigInteger.valueOf(58));
encoded.append(BASE58_CHARACTERS.charAt(divmod[1].intValue()));
number = divmod[0];
}
// Handle leading zeros
for (byte b : data) {
if (b != 0x00) {
break;
}
encoded.append(BASE58_CHARACTERS.charAt(0));
}
return encoded.reverse().toString();
}
public static byte[] decode(String encoded) {
BigInteger number = BigInteger.ZERO;
for (int i = 0; i < encoded.length(); i++) {
number = number.multiply(BigInteger.valueOf(58));
int digitValue = BASE58_CHARACTERS.indexOf(encoded.charAt(i));
number = number.add(BigInteger.valueOf(digitValue));
}
return number.toByteArray();
}
public static void main(String[] args) {
String originalData = "Hello World!";
byte[] encodedData = encode(originalData.getBytes());
byte[] decodedData = decode(new String(encodedData));
System.out.println("Original Data: " + originalData);
System.out.println("Encoded Data: " + new String(encodedData));
System.out.println("Decoded Data: " + new String(decodedData));
}
}
This example code demonstrates the core principle of Base58 codec.It uses the Biginteger class to convert data and use Base58_CharaCters string for codec.During the encoding process, it will handle the front guide and restore the original data during the decoding process.By running the main method, you can see the conversion process between the original data, coding data and decoding data.
Note: Since the Base58 codec is not part of the Java standard library, it is possible to use additional libraries or dependencies to support Base58 codec.In the above sample code, we did not introduce additional dependencies, but manually implemented the Base58 compilation code algorithm.
