type alias DiffieHellmanGroup
Usage in Deno
```typescript import { type DiffieHellmanGroup } from "node:node__crypto.d.ts"; ```Omit<DiffieHellman, "setPublicKey" | "setPrivateKey">
variable DiffieHellmanGroup
The `DiffieHellmanGroup` class takes a well-known modp group as its argument.
It works the same as `DiffieHellman`, except that it does not allow changing its keys after creation.
In other words, it does not implement `setPublicKey()` or `setPrivateKey()` methods.
```js
const { createDiffieHellmanGroup } = await import('node:crypto');
const dh = createDiffieHellmanGroup('modp1');
```
The name (e.g. `'modp1'`) is taken from [RFC 2412](https://www.rfc-editor.org/rfc/rfc2412.txt) (modp1 and 2) and [RFC 3526](https://www.rfc-editor.org/rfc/rfc3526.txt):
```bash
$ perl -ne 'print "$1\n" if /"(modp\d+)"/' src/node_crypto_groups.h
modp1 # 768 bits
modp2 # 1024 bits
modp5 # 1536 bits
modp14 # 2048 bits
modp15 # etc.
modp16
modp17
modp18
```