Extract public/private key logic into separate module

nitro/keys.nim

@@ -0,0 +1,24 @@
+import pkg/secp256k1
+import pkg/nimcrypto
+import ./basics
+
+export basics
+export toPublicKey
+
+include questionable/errorban
+
+type
+  PrivateKey* = SkSecretKey
+  PublicKey* = SkPublicKey
+
+proc rng(data: var openArray[byte]): bool =
+  randomBytes(data) == data.len
+
+proc random*(_: type PrivateKey): PrivateKey =
+  PrivateKey.random(rng).get()
+
+proc `$`*(key: PrivateKey): string =
+  key.toHex()
+
+proc parse*(_: type PrivateKey, s: string): ?PrivateKey =
+  SkSecretKey.fromHex(s).toOption()

nitro/protocol/signature.nim

@@ -2,29 +2,15 @@ import pkg/secp256k1
 import pkg/nimcrypto
 import pkg/stew/byteutils
 import ../basics
+import ../keys
 import ./state
 
 include questionable/errorban
 
 export basics
-export toPublicKey
+export keys
 
-type
-  PrivateKey* = SkSecretKey
-  PublicKey* = SkPublicKey
-  Signature* = SkRecoverableSignature
-
-proc rng(data: var openArray[byte]): bool =
-  randomBytes(data) == data.len
-
-proc random*(_: type PrivateKey): PrivateKey =
-  PrivateKey.random(rng).get()
-
-proc `$`*(key: PrivateKey): string =
-  key.toHex()
-
-proc parse*(_: type PrivateKey, s: string): ?PrivateKey =
-  SkSecretKey.fromHex(s).toOption()
+type Signature* = SkRecoverableSignature
 
 proc sign(key: PrivateKey, data: openArray[byte]): Signature =
   let hash = keccak256.digest(data).data