SHA-512 Hash Generator

Encrypt any text or file to SHA-512, or try to reverse a known SHA-512 hash with the built-in dictionary. 100% client-side via the Web Crypto API.

About SHA-512

SHA-512 is the largest member of the SHA-2 family, producing a 512-bit (128-character hexadecimal) digest. Although the output is twice the size of SHA-256, SHA-512 is often faster on 64-bit CPUs because it uses 64-bit internal operations. It is widely used for high-throughput integrity verification, large file checksums, and 64-bit-native security primitives. Like SHA-256, no practical attack is known.

How to Use

Encrypt: switch to the Text Input or File Input tab, type / paste text or drop a file, then click Generate SHA-512.
Reverse lookup: switch to the Decrypt (Dictionary) tab, paste the target SHA-512 hash, and start the dictionary attack. Only short / common plaintexts are feasible to recover.
Copy: click the copy icon to copy the 128-character hash to your clipboard.

FAQ

Can SHA-512 be decrypted?

SHA-512 is one-way. The dictionary attack here tries each candidate in your wordlist, hashes it with SHA-512, and compares. The 512-bit output space makes random matches astronomically unlikely, so only short / common plaintexts can be recovered.

How to verify a SHA-512 checksum?

Windows (PowerShell): Get-FileHash .\file.zip -Algorithm SHA512
macOS: shasum -a 512 file.zip
Linux: sha512sum file.zip

When should I use SHA-512 over SHA-256?

Use SHA-512 for very large files (multi-GB) where the 64-bit internal word gives higher throughput, or when you want the largest practical output for long-term integrity. For web / TLS / JWT / typical app code, SHA-256 is equally secure and more widely supported.

What is a 128-character SHA-512 hash?

SHA-512 produces a 512-bit digest, rendered as 128 hexadecimal characters. The SHA-512 of "hello" is

9b71d224bd62f3785d96d46ad3ea3d73319bfbc2890caadae2dff72519673ca72323c3d99ba5c11d7c7acc6e14b8c5da0c4663475c2e5c3adef46f73bcdec043

Is my data sent to a server?

No. SHA-512 and the dictionary attack run entirely in your browser via the Web Crypto API. Your text, files, hashes, and wordlist never leave your device.

AI AgentStructured Prompt

Use SHA-512 Hash Calculator in AI

Copy the schema, SOP, and reference script directly into your agent workflow.

1. Function Schema

Import directly into Dify, Coze, Cursor, or any tool-calling agent runtime.

Function Schema

{
  "name": "sha512_hash",
  "description": "Compute the SHA-512 hash of a UTF-8 string and return the 128-character lowercase hex digest. Cryptographically secure; faster than SHA-256 on 64-bit CPUs.",
  "parameters": {
    "type": "object",
    "properties": {
      "input_string": {
        "type": "string",
        "description": "The raw text to hash. Will be encoded as UTF-8 before hashing."
      }
    },
    "required": ["input_string"]
  }
}

2. System Prompt / SOP

Paste this into your system prompt to keep the generated tool implementation aligned with the contract.

System Prompt SOP

# Task Constraints: SHA-512 Module

SHA-512 produces a 512-bit (128 hex character) digest. It is the largest standard member of the SHA-2 family. It is FASTER than SHA-256 on 64-bit CPUs because the internal word size matches the architecture. Use it for: very large file integrity verification, 64-bit-native performance, or when you want the largest practical output.

## Core Prohibitions
- NEVER use raw SHA-512 alone for password storage. Combine with a salt and a slow KDF.
- NEVER compare SHA-512 against SHA-256 outputs — they are different algorithms.
- NEVER claim SHA-512 is "more secure" than SHA-256 in the cryptographic sense; both are equally secure. The difference is output size and 64-bit performance.

## Standard Implementation
1. Encode the input as UTF-8 bytes.
2. Apply SHA-512 per FIPS 180-4 (`crypto.subtle.digest('SHA-512', bytes)`).
3. Return the 128-character lowercase hex digest.
4. Wrap in try/catch and return `{ success, result, error }`.

3. Core Script

Works in any Web Crypto / Node 16+ environment. Returns the 128-char hex digest.

Core Script

async function main(args) {
  const { input_string } = args;
  if (typeof input_string !== "string") {
    return { success: false, result: "", error: "input_string must be a string" };
  }
  try {
    const bytes = new TextEncoder().encode(input_string);
    const buf = await crypto.subtle.digest("SHA-512", bytes);
    const result = Array.from(new Uint8Array(buf))
      .map((b) => b.toString(16).padStart(2, "0"))
      .join("");
    return { success: true, result, error: "" };
  } catch (error) {
    return {
      success: false,
      result: "",
      error: "SHA-512 failed: " + (error instanceof Error ? error.message : String(error)),
    };
  }
}

Full documentation at /hash-calculator/sha512/ai

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