ChaCha20-Poly1305 AEAD Tool
ChaCha20-Poly1305 AEAD Tool: Executes 20-round ChaCha stream cipher and computes one-time Poly1305 128-bit authentication tag.
About this chacha20-poly1305 aead tool
ChaCha20-Poly1305 AEAD Tool — browser-based utility.
How this tool works
Implements client-side ChaCha20-Poly1305 AEAD Tool operations. Executes 20-round ChaCha stream cipher and computes one-time Poly1305 128-bit authentication tag specifically designed for a cryptographer tests chacha20-poly1305 aead authenticated encryption (rfc 8439).
- Key Derivation & CSPRNG Nonce Generation: Derives cryptographic keys from passphrases via PBKDF2 with random salts and generates unique IV nonces.
- Authenticated Encryption (AEAD): Encrypts plaintext blocks and computes an authentication tag to protect against ciphertext tampering.
- Container Formatting: Packages salt, IV, ciphertext, and auth tag into standardized Base64 or JSON envelopes.
- Decryption & Tamper Verification: Verifies the authentication tag before decrypting; throws immediate integrity errors if data was modified.
Worked example
Scenario: Encrypt a short UTF-8 message with explicit all-zero test key and nonce values.
Sample input:
Processing: Validates 32-byte key and 12-byte nonce before performing authenticated ChaCha20-Poly1305 encryption.
Illustrative output:
Limits and verification
Never reuses an Initialization Vector (IV) with the same key (IV reuse in GCM mode destroys authenticity and leaks plaintext). Passphrases cannot be recovered if lost, as no backdoor or recovery key exists.
Examples demonstrate an expected workflow; they do not prove every input or every branch of an external specification. Check important results with an independent source before using them for money, security, compliance, safety, or irreversible file changes.
Browser processing boundary
Tool input is processed by code running in the browser and is not intentionally sent to a CZOA processing API. The page can still request ordinary site assets, analytics, or advertising when those services are enabled. Browser extensions and managed-device software remain outside this tool's control.
Relevant references
These references govern or help explain the format, protocol, or calculation used here. Listing a reference does not claim certification or complete implementation of every optional feature.
Content owner: CZOA Tools · Last reviewed: 2026-09-15 · Review methodology
How to use it
- Enter, paste, or select your input data into the ChaCha20-Poly1305 AEAD Tool workspace controls.
- Review available parameter fields, units, formats, or options configured for your task.
- Click the action button or observe immediate live calculations rendered in your browser runtime.
- Inspect the resulting output and any diagnostic messages, then copy or download the result if needed.
Frequently asked questions
Which fields does ChaCha20-Poly1305 Tool require?+
It reads a JSON object with operation, keyHex, nonceHex, optional aadHex, and plaintext or ciphertextHex. Key and nonce must decode to exactly 32 and 12 bytes.
What does encryption return?+
Encryption returns JSON with algorithm ChaCha20-Poly1305, operation encrypt, ciphertextHex, and the effective key, nonce, and optional AAD hex values.
What did the browser fixture verify?+
Using a zero 32-byte key, zero 12-byte nonce, and plaintext CZOA produced a 20-byte ciphertext-plus-tag hex value with the requested parameters preserved.
How does decryption handle invalid authentication data?+
It invokes authenticated decryption. A malformed key/nonce length or invalid ciphertext authentication tag results in an error rather than plaintext.