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A simple way to decode an SSH key from a seed and its type #37

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Nov 15, 2021
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A simple way to decode an SSH key from a seed and its type #37

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A simple way to decode an SSH key from a seed and its type
dinosaure Nov 14, 2021
9c8d61c
of_string takes Ed25519 key as is instead to use a seed and fortuna rng
dinosaure Nov 15, 2021
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13 changes: 13 additions & 0 deletions lib/keys.ml
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Original file line number Diff line number Diff line change
Expand Up @@ -91,3 +91,16 @@ let of_seed typ seed =
Log.info (fun m -> m "using ssh-ed25519 %s"
(Cstruct.to_string pubkey |> Base64.encode_string));
Hostkey.Ed25519_priv priv

let of_string str =
match String.split_on_char ':' str with
| [ typ; data; ] ->
( match typ_of_string typ, Base64.decode data with
| Ok `Rsa, Ok seed -> Ok (of_seed `Rsa seed)
| Ok `Ed25519, Ok key ->
( match Mirage_crypto_ec.Ed25519.priv_of_cstruct (Cstruct.of_string key) with
| Ok key -> Ok (Hostkey.Ed25519_priv key)
| Error err -> Error (`Msg (Fmt.str "%a" Mirage_crypto_ec.pp_error err)) )
| Error _, _ -> Error (`Msg "Invalid type of SSH key")
| _, Error _ -> Error (`Msg "Invalid b64 key seed") )
| _ -> Error (`Msg "Invalid SSH key format (type:b64-seed)")