SHA Hash Tools

Introduction

One input, four outputs — side by side. This tool generates SHA-1, SHA-256, SHA-384, and SHA-512 hashes simultaneously, letting you see exactly how each algorithm transforms the same data. Whether you're choosing an algorithm for a new project, migrating from SHA-1 to SHA-256, or debugging a hash mismatch between client and server, this comparison view eliminates the guesswork.

What This Tool Does

The SHA Hash Tools generate all four major SHA algorithm variants — SHA-1 (160-bit), SHA-256 (256-bit), SHA-384 (384-bit), and SHA-512 (512-bit) — from the same input text using the Web Crypto API. Each algorithm produces output of different length: SHA-1 outputs 40 hex characters, SHA-256 outputs 64, SHA-384 outputs 96, and SHA-512 outputs 128. This side-by-side comparison helps developers understand output size differences, security tradeoffs, and performance characteristics across the SHA family.

Why It Matters

How It Works

The tool calls crypto.subtle.digest() with four different algorithm identifiers: 'SHA-1', 'SHA-256', 'SHA-384', and 'SHA-512'. Each call processes the same UTF-8 encoded input buffer independently. The Web Crypto API returns an ArrayBuffer for each, which is converted to a hexadecimal string. SHA-1 uses the Merkle-Damgård construction with 80 rounds and produces 160 bits. SHA-256 uses 64 rounds and produces 256 bits. SHA-384 and SHA-512 are truncated variants of SHA-512, processing 1024-bit blocks with 80 rounds. The native implementation leverages hardware acceleration on modern CPUs.

Step-by-Step Examples

Code Examples

async function hashAllVariants(message) {
  const encoder = new TextEncoder();
  const data = encoder.encode(message);
  
  const algorithms = ['SHA-1', 'SHA-256', 'SHA-384', 'SHA-512'];
  const results = {};
  
  for (const algo of algorithms) {
    const hashBuffer = await crypto.subtle.digest(algo, data);
    const hashArray = Array.from(new Uint8Array(hashBuffer));
    results[algo] = hashArray.map(b => b.toString(16).padStart(2, '0')).join('');
  }
  
  return results;
}

// Usage
const hashes = await hashAllVariants('Hello, World!');
console.log(hashes['SHA-256']); // 64 chars
console.log(hashes['SHA-512']); // 128 chars

Benefits

• Compare all four SHA algorithms side by side from the same input text.
• Uses the native Web Crypto API for consistent, hardware-accelerated performance.
• Displays hash length differences to illustrate the tradeoff between output size and security.
• Real-time hash generation as you type for instant feedback.
• Educational comparison helps developers make informed algorithm choices.

Use Cases

Common Mistakes to Avoid

Security Implications

Security Information

All hashing runs in browser memory using the Web Crypto API. Input is never transmitted. SHA-1 is deprecated for security use but still valid for legacy checksums. SHA-256 is the current standard for most applications. SHA-384 and SHA-512 are used in high-security contexts requiring larger hash outputs. All algorithms are NIST-approved (FIPS 180-4) for their respective security levels.

Best Practices

• Use SHA-256 as the default for new applications — it offers the best balance of security and performance.
• Use SHA-384 or SHA-512 for high-security applications requiring larger hash outputs or compliance with specific regulations.
• Avoid SHA-1 for any new security-critical implementation — migrate existing uses to SHA-256.
• Remember that hash length alone does not determine security — the algorithm's cryptographic strength matters more.
• When migrating from SHA-1, support both algorithms during the transition period to avoid breaking existing integrations.