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dendrite/docs/serverkeyformat.md

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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-----