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Add verify.js solution and update sign.js to match #20

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Add verify.js solution and update sign.js to match #20

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34 changes: 28 additions & 6 deletions problems/09.md
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Original file line number Diff line number Diff line change
Expand Up @@ -7,23 +7,45 @@
// sign.js
var sodium = require('sodium-native')

var args = process.argv

if (args.length !== 3) {
console.log(`Usage: node sign.js "<message>"`)
process.exit()
}

var message = Buffer.from(args[2])

var publicKey = Buffer.alloc(sodium.crypto_sign_PUBLICKEYBYTES)
var secretKey = Buffer.alloc(sodium.crypto_sign_SECRETKEYBYTES)
sodium.crypto_sign_keypair(publicKey, secretKey)

var message = Buffer.from('Hello world!')
var signature = Buffer.alloc(sodium.crypto_sign_BYTES)
sodium.crypto_sign_detached(signature, message, secretKey)

sodium.crypto_sign_detached(signature, message, privateKey)

console.log('Public key:': publicKey.toString('hex'))
console.log('Message:': message.toString())
console.log('Signature:': signature.toString('hex'))
console.log(`Message: ${message}`)
console.log(`Public key: ${publicKey.toString('hex')}`)
console.log(`Signature: ${signature.toString('hex')}`)
```

```js
// verify.js
var sodium = require('sodium-native')

var args = process.argv

if (args.length !== 5) {
console.log(`Usage: node verify.js "<message>" <publicKey (hex)> <signature (hex)>`)
process.exit()
}

var message = Buffer.from(args[2])
var publicKey = Buffer.from(args[3], 'hex')
var signature = Buffer.from(args[4], 'hex')

const isSignatureValid = sodium.crypto_sign_verify_detached(signature, message, publicKey)

console.log(`Signature is ${isSignatureValid ? 'valid' : 'invalid'}.`)
```

</details>
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