tink-proto: move to core+alloc

The "json" feature requires the base64 and serde dependencies to have
their "alloc" feature enabled.

Author: daviddrysdale

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "tink-proto"
-version = "0.2.0"
+version = "0.3.0"
 authors = ["David Drysdale <[email protected]>"]
 edition = "2018"
 license = "Apache-2.0"
@@ -14,9 +14,9 @@ default = []
 json = ["base64", "serde"]
 
 [dependencies]
-base64 = { version = "^0.13", optional = true }
-prost = "^0.8"
-serde = { version = "^1.0.126", features = ["derive"], optional = true }
+base64 = { version = "^0.13", default-features = false, features = ["alloc"], optional = true }
+prost = { version = "^0.8", default-features = false }
+serde = { version = "^1.0.126", default-features = false, features = ["alloc", "derive"], optional = true }
 
 [build-dependencies]
 prost-build = "^0.8"

proto/Cargo.toml

@@ -16,8 +16,12 @@
 
 //! Protocol buffer message definitions for Tink.
 
+#![no_std]
 #![deny(broken_intra_doc_links)]
 
+#[cfg(feature = "json")]
+extern crate alloc;
+
 #[cfg(not(feature = "json"))]
 include!("codegen/google.crypto.tink.rs");
 #[cfg(feature = "json")]
@@ -30,6 +34,7 @@ pub mod json {
     //! the `i32` values used by prost.
     pub mod key_status_type {
         //! Manual JSON serialization for [`KeyStatusType`](crate::KeyStatusType) enums.
+        use alloc::string::String;
         use serde::Deserialize;
         pub fn serialize<S: serde::Serializer>(
             val: &i32,
@@ -56,6 +61,7 @@ pub mod json {
     }
     pub mod output_prefix_type {
         //! Manual JSON serialization for [`OutputPrefixType`](crate::OutputPrefixType) enums.
+        use alloc::string::String;
         use serde::Deserialize;
         pub fn serialize<S: serde::Serializer>(
             val: &i32,
@@ -85,6 +91,7 @@ pub mod json {
     pub mod key_material_type {
         //! Manual JSON serialization for [`KeyMaterialType`](crate::key_data::KeyMaterialType)
         //! enums.
+        use alloc::string::String;
         use serde::Deserialize;
         pub fn serialize<S: serde::Serializer>(
             val: &i32,
@@ -113,6 +120,7 @@ pub mod json {
     }
     pub mod b64 {
         //! Manual serialization implementations for base64-encoded binary data.
+        use alloc::{string::String, vec::Vec};
         use serde::Deserialize;
         pub fn serialize<S: serde::Serializer>(
             val: &[u8],