Fix compile-error on WASM

Author: aumetra

Cargo.lock

@@ -29,6 +29,7 @@ ark-bls12-381 = { version = "0.4.0", optional = true }
 ark-ec = { version = "0.4.2", features = ["parallel"], optional = true }
 ark-ff = { version = "0.4.2", features = ["asm", "parallel"], optional = true }
 ark-serialize = { version = "0.4.2", optional = true }
+cfg-if = "1.0.0"
 derive_more = { version = "1.0.0-beta.6", default-features = false, features = ["display", "from"] }
 digest = "0.10"
 ecdsa = "0.16.2" # Not used directly, but needed to bump transitive dependency, see: https://github.com/CosmWasm/cosmwasm/pull/1899 for details.

packages/crypto/Cargo.toml

@@ -1,22 +1,22 @@
 //!
 //! Note about the usage of `.unwrap()` here:
-//! 
+//!
 //! Since the underlying curve implementation, when implemented sanely, should never request 255 curve elements at the same time,
 //! the expansion will always finish without exiting with an error (since that is the only "ABORT" condition).
 //!
 //! Therefore we can conclude, if the implementation is done as defined in the IETF publication, won't ever error out.
-//! 
+//!
 //! IETF doc in question: <https://datatracker.ietf.org/doc/html/draft-irtf-cfrg-hash-to-curve-12#section-5.4.1>
-//! 
+//!
 //! In addition to that I (@aumetra) skimmed through the tree of traits making up our hash-to-curve configuration,
 //! and I have not found a condition where an error is returned.
-//! 
+//!
 //! ark crate versions that I looked at:
-//! 
+//!
 //! - ark-bls12-381 v0.4.0
 //! - ark-ec v0.4.2
 //! - ark-ff v0.4.2
-//! 
+//!
 
 use ark_bls12_381::{g1, g2};
 use ark_ec::{

packages/crypto/src/bls12_318/hash.rs

@@ -1,13 +1,17 @@
-mod aggregate;
-mod constants;
-mod hash;
-mod pairing;
-mod points;
+cfg_if::cfg_if! {
+    if #[cfg(feature = "std")] {
+        mod aggregate;
+        mod constants;
+        mod hash;
+        mod pairing;
+        mod points;
 
-pub use aggregate::{bls12_381_aggregate_g1, bls12_381_aggregate_g2};
-pub use hash::{bls12_381_hash_to_g1, bls12_381_hash_to_g2, HashFunction};
-pub use pairing::bls12_381_pairing_equality;
-pub use points::{bls12_381_g1_is_identity, bls12_381_g2_is_identity};
+        pub use self::aggregate::{bls12_381_aggregate_g1, bls12_381_aggregate_g2};
+        pub use self::hash::{bls12_381_hash_to_g1, bls12_381_hash_to_g2, HashFunction};
+        pub use self::pairing::bls12_381_pairing_equality;
+        pub use self::points::{bls12_381_g1_is_identity, bls12_381_g2_is_identity};
+    }
+}
 
 pub const BLS12_381_G1_POINT_LEN: usize = 48;
 pub const BLS12_381_G2_POINT_LEN: usize = 96;

packages/crypto/src/bls12_318/mod.rs

@@ -11,7 +11,6 @@ extern crate alloc;
 extern crate std; // allow for file I/O during tests
 
 mod backtrace;
-#[cfg(feature = "std")]
 mod bls12_318;
 mod ecdsa;
 mod ed25519;
@@ -25,8 +24,13 @@ mod secp256r1;
 pub use crate::bls12_318::{
     bls12_381_aggregate_g1, bls12_381_aggregate_g2, bls12_381_g1_is_identity,
     bls12_381_g2_is_identity, bls12_381_hash_to_g1, bls12_381_hash_to_g2,
-    bls12_381_pairing_equality, HashFunction, BLS12_381_G1_GENERATOR_COMPRESSED,
-    BLS12_381_G1_POINT_LEN, BLS12_381_G2_GENERATOR_COMPRESSED, BLS12_381_G2_POINT_LEN,
+    bls12_381_pairing_equality, HashFunction,
+};
+
+#[doc(hidden)]
+pub use crate::bls12_318::{
+    BLS12_381_G1_GENERATOR_COMPRESSED, BLS12_381_G1_POINT_LEN, BLS12_381_G2_GENERATOR_COMPRESSED,
+    BLS12_381_G2_POINT_LEN,
 };
 #[doc(hidden)]
 pub use crate::ecdsa::{ECDSA_PUBKEY_MAX_LEN, ECDSA_SIGNATURE_LEN, MESSAGE_HASH_MAX_LEN};