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## Scalar multiplication over Curve25519
> **See also**: [Libsodium's documentation on its scalar multiplication features](https://download.libsodium.org/doc/advanced/scalar_multiplication).
### crypto_scalarmult
Elliptic Curve Diffie-Hellman key exchange over Curve25519.
You probably don't want to ever use this directly.
**Parameters and their respective types**:
1. `{X25519SecretKey}` your secret key
2. `{X25519PublicKey}` their public key
Returns a `Promise` that resolves to a `CryptographyKey`.
### crypto_scalarmult_base
Generate an X25519PublicKey from an X25519SecretKey.
**Parameters and their respective types**:
1. `{X25519SecretKey}` your secret key
Returns a `Promise` that resolves to an `X25519PublicKey`.
### Example for crypto_scalarmult
```javascript
const { SodiumPlus } = require('sodium-plus');
let sodium;
(async function () {
if (!sodium) sodium = await SodiumPlus.auto();
let aliceKeypair = await sodium.crypto_box_keypair();
let aliceSecret = await sodium.crypto_box_secretkey(aliceKeypair);
let alicePublic = await sodium.crypto_box_publickey(aliceKeypair);
let bobKeypair = await sodium.crypto_box_keypair();
let bobSecret = await sodium.crypto_box_secretkey(bobKeypair);
let bobPublic = await sodium.crypto_scalarmult_base(bobSecret);
let aliceToBob = await sodium.crypto_scalarmult(aliceSecret, bobPublic);
let bobToAlice = await sodium.crypto_scalarmult(bobSecret, alicePublic);
console.log({
'alice-to-bob': aliceToBob.getBuffer().toString('hex'),
'bob-to-alice': bobToAlice.getBuffer().toString('hex')
});
})();
```
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