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2.4. Base58

什么是Base58?

2.4.1. php

		
<?php

$number = '123456789009876543211234567890';
$result = base58_encode($number);
echo('Encoded: ' . $result . '<br>');
echo('Decoded: ' . base58_decode($result) . '<br>');


function base58_encode($input)
{
    $alphabet = '123456789abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ';
    $base_count = strval(strlen($alphabet));
    $encoded = '';
    while (floatval($input) >= floatval($base_count))
    {
        $div = bcdiv($input, $base_count);
        $mod = bcmod($input, $base_count);
        $encoded = substr($alphabet, intval($mod), 1) . $encoded;
        $input = $div;
    }
    if (floatval($input) > 0)
    {
        $encoded = substr($alphabet, intval($input), 1) . $encoded;
    }
    return($encoded);
}

function base58_decode($input)
{
    $alphabet = '123456789abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ';
    $base_count = strval(strlen($alphabet));
    $decoded = strval(0);
    $multi = strval(1);
    while (strlen($input) > 0)
    {
        $digit = substr($input, strlen($input) - 1);
        $decoded = bcadd($decoded, bcmul($multi, strval(strpos($alphabet, $digit))));
        $multi = bcmul($multi, $base_count);
        $input = substr($input, 0, strlen($input) - 1);
    }
    return($decoded);
}		
		
		

2.4.2. Java Base58

Maven 文件添加下面代码

		
  <repositories>
    <repository>
        <id>jitpack.io</id>
        <url>https://jitpack.io</url>
    </repository>
  </repositories>

  <dependencies>
    <dependency>
      <groupId>com.github.multiformats</groupId>
      <artifactId>java-multihash</artifactId>
      <version>$LATEST_VERSION</version>
    </dependency>
  </dependencies>		
		
		
		
import io.ipfs.multibase.Base58;

Base58.encode(string);

Base58.decode(encrypted)


		
Multihash m = Multihash.fromBase58("QmatmE9msSfkKxoffpHwNLNKgwZG8eT9Bud6YoPab52vpy");