Ed25519 Signature Generator & Verifier
Ed25519 Signature Generator & Verifier: Computes Ed25519 Edwards-curve digital signature (RFC 8032) in browser memory.
About this ed25519 signature generator & verifier
Computes Ed25519 Edwards-curve digital signature (RFC 8032) in browser memory Runs entirely in-memory using Web Crypto primitives to keep sensitive tokens, certificates, and cryptographic keys secure from third-party interception.
Encoding & cryptographic principles
Performs symmetric encryption and asymmetric public-key operations adhering to NIST FIPS 197 (AES), RFC 7539 (ChaCha20-Poly1305), RFC 8032 (Ed25519 Digital Signatures), and PKCS#1 / RFC 3447 (RSA). AES-GCM provides authenticated symmetric encryption using 128-bit or 256-bit keys and 96-bit initialization vectors (IVs) to ensure confidentiality and cryptographic authentication. Key derivation employs PBKDF2 (RFC 2898) with HMAC-SHA256 and configurable salt iterations to thwart brute-force dictionary attacks.
Worked verification example
Scenario: Verify a published Ed25519 signature over a fixed UTF-8 test message.
Sample input:
Processing: Verifies the 64-byte signature against the exact message and 32-byte public key; a valid signature does not establish signer identity.
Illustrative output:
Security parameters & input constraints
The signing result exposes the private key, so do not treat the text area as secure storage. Verification proves that this signature matches this message and public key; it does not establish signer identity or trust. Invalid hex/key lengths may error.
Cryptographic digests, encoded strings, and signatures generated by Ed25519 Signature Generator & Verifier should be verified against target authentication systems before production use.
Client-side Web Crypto boundary
Key derivation, hashing, and encoding in Ed25519 Signature Generator & Verifier execute in local memory using Web Crypto APIs without remote socket transmission.
Cryptographic specifications & RFC standards
Technical specifications and cryptographic RFC standards governing algorithms and key representations:
Ed25519 Signature Generator & Verifier verification · Audit standards
How to use it
- Enter JSON with a message and optional privateKeyHex; without a key, signing generates a new random one.
- Run locally to sign with Ed25519, returning publicKeyHex, signatureHex and a local verification flag.
- For verification, enter operation verify, the same message, publicKeyHex and signatureHex; read valid.
Frequently asked questions
How does Ed25519 Signature Tool choose sign or verify mode?+
It parses JSON and defaults operation to sign. The supplied message is UTF-8 encoded; verify requires signatureHex and publicKeyHex.
What is returned in signing mode?+
Signing returns algorithm Ed25519, operation sign, privateKeyHex, publicKeyHex, signatureHex, and verified after locally checking that signature.
What example can I run locally?+
A sign request for CZOA returned verified true, a 32-byte private key, 32-byte public key, and a 64-byte signature represented as hex.
What does verify mode report?+
Verify returns JSON with algorithm, operation verify, and valid. It does not establish a signer identity, certificate chain, timestamp, or authorization.