SHA256 Generator Hash generators

// Using Web Crypto API (modern browsers)
async function sha256(message) {
    const msgBuffer = new TextEncoder().encode(message);
    const hashBuffer = await crypto.subtle.digest('SHA-256', msgBuffer);
    const hashArray = Array.from(new Uint8Array(hashBuffer));
    const hashHex = hashArray.map(b => b.toString(16).padStart(2, '0')).join('');
    return hashHex;
}

// Usage
sha256('Hello World').then(hash => {
    console.log(hash); // a591a6d40bf420404a011733cfb7b190d62c65bf0bcda32b4f87e8ce45d5331a0
});

// Using crypto-js library
const CryptoJS = require('crypto-js');
const hash = CryptoJS.SHA256('Hello World').toString();

// Node.js built-in
const crypto = require('crypto');
const hash = crypto.createHash('sha256')
                  .update('Hello World')
                  .digest('hex');

import hashlib

# Hash a string
text = "Hello World"
hash_object = hashlib.sha256(text.encode())
hex_dig = hash_object.hexdigest()
print(hex_dig)  # a591a6d40bf420404a011733cfb7b190d62c65bf0bcda32b4f87e8ce45d5331a0

# Hash a file
def hash_file(filename):
    h = hashlib.sha256()
    with open(filename, 'rb') as file:
        while chunk := file.read(8192):
            h.update(chunk)
    return h.hexdigest()

# HMAC-SHA256
import hmac
key = b'secret_key'
message = b'Hello World'
hmac_hash = hmac.new(key, message, hashlib.sha256).hexdigest()

// Hash a string
$text = "Hello World";
$hash = hash('sha256', $text);
echo $hash; // a591a6d40bf420404a011733cfb7b190d62c65bf0bcda32b4f87e8ce45d5331a0

// Hash with binary output
$binaryHash = hash('sha256', $text, true);

// Hash a file
$fileHash = hash_file('sha256', 'file.txt');

// HMAC-SHA256
$key = 'secret_key';
$hmac = hash_hmac('sha256', $text, $key);

# Linux/Mac
echo -n "Hello World" | sha256sum
# a591a6d40bf420404a011733cfb7b190d62c65bf0bcda32b4f87e8ce45d5331a0  -

# Mac alternative
echo -n "Hello World" | shasum -a 256

# Hash a file
sha256sum file.txt

# Windows PowerShell
Get-FileHash file.txt -Algorithm SHA256

# OpenSSL
echo -n "Hello World" | openssl dgst -sha256

// Generate checksum for download verification
const fileBuffer = await fetch('https://example.com/file.zip').then(r => r.arrayBuffer());
const hashBuffer = await crypto.subtle.digest('SHA-256', fileBuffer);
const checksum = Array.from(new Uint8Array(hashBuffer))
    .map(b => b.toString(16).padStart(2, '0'))
    .join('');

// Verify against published checksum
if (checksum === publishedChecksum) {
    console.log('File integrity verified!');
}

import hashlib
import hmac
import time

# Create signed API request
api_key = "your_api_key"
api_secret = "your_api_secret"
timestamp = str(int(time.time()))
method = "POST"
path = "/api/v1/orders"
body = '{"symbol":"BTCUSD","size":100}'

# Create signature
message = timestamp + method + path + body
signature = hmac.new(
    api_secret.encode(),
    message.encode(),
    hashlib.sha256
).hexdigest()

# Add to request headers
headers = {
    'API-KEY': api_key,
    'API-TIMESTAMP': timestamp,
    'API-SIGNATURE': signature
}