Fix Crystal 0.31 warnings.

shard.yml

@@ -4,7 +4,7 @@ version: 1.1.0
 authors:
 - Andrew Hamon <andrew@hamon.cc>
 - Didactic Drunk <1479616+didactic-drunk@users.noreply.github.com>
-crystal: 0.29.0
+crystal: 0.31.1
 targets:
   pwhash_selector:
     main: examples/pwhash_selector.cr

src/sodium/cipher/chalsa.cr

@@ -72,8 +72,8 @@ module Sodium::Cipher
     end
 
     abstract def update(src : Bytes, dst : Bytes)
-    abstract def key_size
+    abstract def key_size : Int32
-    abstract def nonce_size
+    abstract def nonce_size : Int32
   end
 
   {% for key, val in {"XSalsa20" => "xsalsa20", "Salsa20" => "salsa20", "XChaCha20" => "xchacha20", "ChaCha20Ietf" => "chacha20_ietf", "ChaCha20" => "chacha20"} %}

src/sodium/crypto_box/public_key.cr

@@ -7,7 +7,7 @@ class Sodium::CryptoBox
     SEAL_SIZE = LibSodium.crypto_box_sealbytes
 
     # Returns key
-    delegate to_slice, to: @bytes
+    delegate_to_slice to: @bytes
 
     # :nodoc:
     # Only used by SecretKey

src/sodium/crypto_box/secret_key.cr

@@ -42,7 +42,7 @@ class Sodium::CryptoBox
     getter public_key : PublicKey
 
     # Returns key
-    delegate to_slice, to: @sbuf
+    delegate_to_slice to: @sbuf
 
     @seed : SecureBuffer?
 

src/sodium/kdf.cr

@@ -23,7 +23,7 @@ module Sodium
     CONTEXT_SIZE = LibSodium.crypto_kdf_contextbytes
 
     # Returns key
-    delegate to_slice, to: @sbuf
+    delegate_to_slice to: @sbuf
 
     # Use an existing KDF key.
     #

src/sodium/lib_sodium.cr

@@ -1,6 +1,12 @@
 require "random/secure"
 require "./error"
 
+macro delegate_to_slice(to object)
+  def to_slice() : Bytes
+    {{object.id}}.to_slice
+  end
+end
+
 module Sodium
   @[Link(ldflags: "`#{__DIR__}/../../build/pkg-libs.sh #{__DIR__}/../..`")]
   lib LibSodium

src/sodium/nonce.cr

@@ -16,7 +16,7 @@ module Sodium
     property? reusable = false
 
     # Returns bytes
-    delegate to_slice, to: @bytes
+    delegate_to_slice to: @bytes
 
     delegate bytesize, to: @bytes
 

src/sodium/secret_box.cr

@@ -20,7 +20,7 @@ module Sodium
     MAC_SIZE   = LibSodium.crypto_secretbox_macbytes.to_i
 
     # Returns key
-    delegate to_slice, to: @key
+    delegate_to_slice to: @key
 
     # Encryption key
     getter key : SecureBuffer

src/sodium/sign/public_key.cr

@@ -6,7 +6,7 @@ module Sodium
     SIG_SIZE = LibSodium.crypto_sign_bytes.to_i
 
     # Returns key
-    delegate to_slice, to: @bytes
+    delegate_to_slice to: @bytes
 
     # :nodoc:
     # Only used by SecretKey

src/sodium/sign/secret_key.cr

@@ -21,7 +21,7 @@ module Sodium
     getter public_key : PublicKey
 
     # Returns key
-    delegate to_slice, to: @sbuf
+    delegate_to_slice to: @sbuf
 
     @seed : SecureBuffer?