I found a problem while implementing the "4. Server accepts" section on the documentation when computing detached_signature_B .
I think there is something wrong in the documentation.
To my understanding, server_longterm_sk is 32 bytes long and crypto_sign_detached expects a 64 bytes long key.
When I try to implement the secure handshake myself using the sodium-native package, I get the following error:
sodium.crypto_sign_detached(detached_signature_B, msg, server_longterm_sk);
^
Error: "sk" must be crypto_sign_SECRETKEYBYTES bytes long
at Socket.<anonymous> (~/index.ts:146:28)
at Socket.emit (node:events:369:20)
at Socket.emit (node:domain:470:12)
at addChunk (node:internal/streams/readable:313:12)
at readableAddChunk (node:internal/streams/readable:288:9)
at Socket.Readable.push (node:internal/streams/readable:227:10)
at TCP.onStreamRead (node:internal/stream_base_commons:190:23)
Where server_longterm_sk is 32 bytes long and sodium.crypto_sign_SECRETKEYBYTES's value is 64.
Link to documentation: https://ssbc.github.io/scuttlebutt-protocol-guide/#:~:text=key%3A%20server_longterm_sk
Links to libsodium definition of crypto_sign_SECRETKEYBYTES https://github.com/jedisct1/libsodium/blob/6d566070b48efd2fa099bbe9822914455150aba9/src/libsodium/include/sodium/crypto_sign.h#L40 and https://github.com/jedisct1/libsodium/blob/6d566070b48efd2fa099bbe9822914455150aba9/src/libsodium/include/sodium/crypto_sign_ed25519.h#L34
Is there something wrong with the documentation? Or have I misunderstood something?
I found a problem while implementing the "4. Server accepts" section on the documentation when computing
detached_signature_B.I think there is something wrong in the documentation.
To my understanding,
server_longterm_skis 32 bytes long andcrypto_sign_detachedexpects a 64 bytes long key.When I try to implement the secure handshake myself using the
sodium-nativepackage, I get the following error:Where
server_longterm_skis 32 bytes long andsodium.crypto_sign_SECRETKEYBYTES's value is 64.Link to documentation: https://ssbc.github.io/scuttlebutt-protocol-guide/#:~:text=key%3A%20server_longterm_sk
Links to libsodium definition of
crypto_sign_SECRETKEYBYTEShttps://github.com/jedisct1/libsodium/blob/6d566070b48efd2fa099bbe9822914455150aba9/src/libsodium/include/sodium/crypto_sign.h#L40 and https://github.com/jedisct1/libsodium/blob/6d566070b48efd2fa099bbe9822914455150aba9/src/libsodium/include/sodium/crypto_sign_ed25519.h#L34Is there something wrong with the documentation? Or have I misunderstood something?