Convert ED25519 private key from hexadecimal encoded string to DER

Question

Using JavaScript and Node.js, how can I reliably convert an ED25519 private key (used on Hedera Testnet) from hexadecimal encoded string format to DER encoded?

Example input value:

6c91776d90126ce548ac1a399cc174383483d54874297d0f8d083aaXXXXXXXX

The output should be something like this:

302e020100300506032b657004220420xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Please may you provide example expected output and your current approach as a text-based minimal reproducible example? — evolutionxbox
– evolutionxbox, Commented Aug 19, 2024 at 15:21
Yep, I added the expected output. The answer below works for me. — Giuseppe Bertone
– Giuseppe Bertone, Commented Aug 19, 2024 at 20:21

bguiz · Accepted Answer · 2024-08-20 03:06:07Z

Create a script: convert.js

#!/usr/bin/env node import {PrivateKey} from "@hashgraph/sdk"; let hex = process.argv[2]; console.log(hex); let x = PrivateKey.fromStringED25519(hex); let der = x.toBytesDer(); let derhex = Buffer.from(der).toString('hex'); console.log(derhex);

Run:

npm i

Set "type": "module" in package.json

Run:

./convert.js

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