Ed25519 / X25519 Keygen and Signature Verifier

Ed25519 / X25519 Keygen and Signature Verifier | Online Free Tool | Elysia Tools

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category: Security
Input types: select, textarea
Output type: json
Sample coverage: 4
API ready: Yes

Overview

The Ed25519 / X25519 Keygen and Signature Verifier allows you to generate secure cryptographic keypairs, sign messages, and verify signatures. You can generate Ed25519 keys for digital signatures or X25519 keys for Diffie-Hellman key agreement, using either random generation or a deterministic seed text, with output encoded in Base64 or Base58.

When to use

When you need to generate Ed25519 keypairs for signing API requests or SSH authentication.
When you need to generate X25519 keypairs for secure key agreement protocols.
When you need to sign a message or verify an existing Ed25519 signature using Base64 or Base58 encoded keys.

How it works

1Select the operation (Generate, Sign, or Verify) and choose the algorithm (Ed25519 or X25519).
2Choose your preferred encoding format, either Base64 or Base58.
3Provide optional seed text for deterministic key generation, or input the required keys, message, and signature for signing and verification operations.
4Run the tool to compute and output the cryptographic results in structured JSON format.

Use cases

Generating deterministic Ed25519 keypairs from a custom seed phrase for reproducible deployments.
Signing API payloads or configuration files using an Ed25519 secret key.
Verifying the authenticity of a received message against a public key and signature.

Examples

1. Generate Deterministic Ed25519 Keys

Security Engineer

Background

A security engineer needs to generate a reproducible Ed25519 keypair for a CI/CD pipeline without storing the private key permanently.

Problem

Generating the exact same keypair on demand using a secure seed phrase.

How to use

Set the operation to 'Generate', select 'Ed25519' as the algorithm, choose 'Base58' encoding, and enter the seed text.

Operation: Generate, Algorithm: Ed25519, Encoding: Base58, Seed Text: 'my team release signing seed 2026'

Outcome

The tool outputs the deterministic public and secret keys in Base58 format.

2. Verify an Ed25519 Signature

API Developer

Background

An API developer receives a webhook payload along with a Base64-encoded signature and needs to verify its authenticity.

Problem

Confirming that the payload was signed by the holder of the corresponding public key.

How to use

Set the operation to 'Verify', select 'Ed25519' and 'Base64' encoding, then input the public key, the payload message, and the signature.

FAQ

What is the difference between Ed25519 and X25519?

Ed25519 is optimized for digital signatures, while X25519 is designed for Diffie-Hellman key agreement.

Can I sign messages using X25519?

No, message signing and verification operations in this tool are supported for Ed25519 only.

What does deterministic key generation mean?

It means the tool will always generate the exact same keypair when you provide the same seed text.

Which encodings are supported for the keys and signatures?

The tool supports Base64 and Base58 encodings for inputting and outputting keys and signatures.

Does this tool support BIP39 mnemonic phrases?

No, the seed text option uses a custom hashed input for deterministic generation, not the BIP39 standard.

Operation: Verify, Algorithm: Ed25519, Encoding: Base64, Message: 'payload-data', Public Key: '...', Signature: '...'

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Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Generate Deterministic Ed25519 Keys

2. Verify an Ed25519 Signature

FAQ

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