Document dendrite server key format (#1520)

Co-authored-by: Kegsay <kegan@matrix.org>
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Adit Sachde 2020-10-22 07:21:31 -04:00 committed by GitHub
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@ -129,6 +129,10 @@ for federation and the server signing key:
./bin/generate-keys --private-key matrix_key.pem --tls-cert server.crt --tls-key server.key
```
If you have server keys from an older synapse instance,
[convert them](serverkeyformat.md#converting-synapse-keys) to Dendrite's PEM
format and configure them as `old_private_keys` in your config.
### Configuration file
Create config file, based on `dendrite-config.yaml`. Call it `dendrite.yaml`. Things that will need editing include *at least*:

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docs/serverkeyformat.md Normal file
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# Server Key Format
Dendrite stores the server signing key in the PEM format with the following structure.
```
-----BEGIN MATRIX PRIVATE KEY-----
Key-ID: ed25519:<Key Handle>
<Base64 Encoded Key Data>
-----END MATRIX PRIVATE KEY-----
```
## Converting Synapse Keys
If you have signing keys from a previous synapse server, you should ideally configure them as `old_private_keys` in your Dendrite config file. Synapse stores signing keys in the following format.
```
ed25519 <Key Handle> <Base64 Encoded Key Data>
```
To convert this key to Dendrite's PEM format, use the following template. **It is important to include the equals sign, as the key data needs to be padded to 32 bytes.**
```
-----BEGIN MATRIX PRIVATE KEY-----
Key-ID: ed25519:<Key Handle>
<Base64 Encoded Key Data>=
-----END MATRIX PRIVATE KEY-----
```