feat: support wasm32 target

Cargo.toml

@@ -14,18 +14,25 @@ description = "Fuel cryptographic primitives."
 borrown = "0.1"
 fuel-types = { version = "0.5", default-features = false }
 lazy_static = { version = "1.4", optional = true }
+serde = { version = "1.0", default-features = false, features = ["derive"], optional = true }
+sha2 = { version = "0.9", default-features = false }
+
+[target.'cfg(target_arch = "wasm32")'.dependencies]
+# the deterministic arguments of the signature (key, nonce, message), as defined in the RFC-6979
+rand = { version = "0.8", default-features = false, features = ["alloc"], optional = true }
+secp256k1 = { version = "0.20", default-features = false, features = [ "alloc", "rand", "recovery" ], optional = true }
+
+[target.'cfg(not(target_arch = "wasm32"))'.dependencies]
 rand = { version = "0.8", default-features = false, features = ["std_rng"], optional = true }
 # `rand-std` is used to further protect the blinders from side-channel attacks and won't compromise
 # the deterministic arguments of the signature (key, nonce, message), as defined in the RFC-6979
 secp256k1 = { version = "0.20", features = [ "rand-std", "recovery" ], optional = true }
-serde = { version = "1.0", default-features = false, features = ["derive"], optional = true }
-sha2 = { version = "0.9", default-features = false }
 
 [dev-dependencies]
 bincode = { version = "1.3", default-features = false }
 criterion = "0.3"
 fuel-crypto = { path = ".", default-features = false, features = ["random"] }
-k256 = { version = "0.10", features = [ "ecdsa" ] }
+k256 = { version = "0.10", default-features = false, features = [ "ecdsa" ] }
 rand = { version = "0.8", default-features = false, features = ["std_rng"] }
 sha2 = "0.9"