無料オンラインハッシュジェネレーターツール

JavaScript ハッシュ関数の実装

// Using built-in Web Crypto API for SHA-256 hash
async function sha256Hash(message) {
  // Convert string to ArrayBuffer
  const msgBuffer = new TextEncoder().encode(message);
  // Use SubtleCrypto API to calculate hash
  const hashBuffer = await crypto.subtle.digest('SHA-256', msgBuffer);
  // Convert ArrayBuffer to hexadecimal string
  const hashArray = Array.from(new Uint8Array(hashBuffer));
  const hashHex = hashArray.map(b => b.toString(16).padStart(2, '0')).join('');
  return hashHex;
}

// Usage example
sha256Hash('Hello, LightNode!').then(hash => console.log(hash));
// Output will be the SHA-256 hash of "Hello, LightNode!"

Python ハッシュ関数の実装

import hashlib

# MD5 hash
def generate_md5(text):
    # String must be encoded before hashing
    text_bytes = text.encode('utf-8')
    hash_obj = hashlib.md5()
    hash_obj.update(text_bytes)
    return hash_obj.hexdigest()

# SHA-256 hash
def generate_sha256(text):
    text_bytes = text.encode('utf-8')
    hash_obj = hashlib.sha256()
    hash_obj.update(text_bytes)
    return hash_obj.hexdigest()

# Usage example
print(generate_md5('Hello, LightNode!'))  
# Output: MD5 hash of "Hello, LightNode!"

print(generate_sha256('Hello, LightNode!'))
# Output: SHA-256 hash of "Hello, LightNode!"

Java ハッシュ関数の実装

import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class HashExample {
    
    public static String sha256(String input) throws NoSuchAlgorithmException {
        MessageDigest digest = MessageDigest.getInstance("SHA-256");
        byte[] hash = digest.digest(input.getBytes(StandardCharsets.UTF_8));
        
        // Convert byte array to hexadecimal string
        StringBuilder hexString = new StringBuilder();
        for (byte b : hash) {
            String hex = Integer.toHexString(0xff & b);
            if (hex.length() == 1) {
                hexString.append('0');
            }
            hexString.append(hex);
        }
        return hexString.toString();
    }
    
    public static String md5(String input) throws NoSuchAlgorithmException {
        MessageDigest digest = MessageDigest.getInstance("MD5");
        byte[] hash = digest.digest(input.getBytes(StandardCharsets.UTF_8));
        
        // Convert byte array to hexadecimal string
        StringBuilder hexString = new StringBuilder();
        for (byte b : hash) {
            String hex = Integer.toHexString(0xff & b);
            if (hex.length() == 1) {
                hexString.append('0');
            }
            hexString.append(hex);
        }
        return hexString.toString();
    }
    
    public static void main(String[] args) {
        try {
            System.out.println("MD5: " + md5("Hello, LightNode!"));
            System.out.println("SHA-256: " + sha256("Hello, LightNode!"));
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
    }
}