convert dependencies and get working build

Cargo.toml

@@ -26,9 +26,6 @@ counters = []
 # debugging and tracing of programs.
 pre-eval = []
 
-# On UNIX-based platforms, you may get a speed boost on `sha256` operations by building
-# with OpenSSL.when enabled
-openssl = ["dep:openssl"]
 
 [profile.release]
 lto = "thin"
@@ -39,13 +36,18 @@ num-bigint = "0.4.3"
 num-traits = "0.2.15"
 num-integer = "0.1.45"
 chia-bls = "0.4.0"
-sha2 = "0.10.8"
-openssl = { version = "=0.10.55", features = ["vendored"], optional = true }
 hex-literal = "=0.4.1"
 # for secp sigs
 k256 = { version = "0.13.1", features = ["ecdsa"] }
 p256 = { version = "0.13.2", features = ["ecdsa"] }
 
+
+[target.'cfg(windows)'.dependencies]
+sha2 = "0.10.8"
+
+[target.'cfg(unix)'.dependencies]
+openssl = { version = "=0.10.55", features = ["vendored"] }
+
 [dev-dependencies]
 rstest = "0.17.0"
 criterion = "0.5.1"

src/sha2.rs

@@ -1,15 +1,15 @@
-#[cfg(feature = "openssl")]
-use openssl;
-
-#[cfg(not(feature = "openssl"))]
+#[cfg(target_family = "windows")]
 use sha2::Digest;
 
+#[cfg(target_family = "unix")]
+use openssl;
+
 #[derive(Default, Clone)]
 pub struct Sha256 {
-    #[cfg(feature = "openssl")]
+    #[cfg(target_family = "unix")]
     ctx: openssl::sha::Sha256,
 
-    #[cfg(not(feature = "openssl"))]
+    #[cfg(target_family = "windows")]
     ctx: sha2::Sha256,
 }
 
@@ -21,11 +21,11 @@ impl Sha256 {
         self.ctx.update(buf.as_ref());
     }
     pub fn finalize(self) -> [u8; 32] {
-        #[cfg(feature = "openssl")]
+        #[cfg(target_family = "unix")]
         {
             self.ctx.finish()
         }
-        #[cfg(not(feature = "openssl"))]
+        #[cfg(target_family = "windows")]
         {
             self.ctx.finalize().into()
         }

wheel/Cargo.toml

@@ -19,4 +19,3 @@ clvmr = { path = ".." }
 pyo3 = { version = "=0.18.3", features = ["abi3-py38", "extension-module"] }
 
 [features]
-openssl = ["clvmr/openssl"]

wheel/README.md

@@ -15,22 +15,8 @@ While in the `wheel` directory, build `clvm_rs` into the current virtualenv with
 $ maturin develop --release
 ```
 
-On UNIX-based platforms, you may get a speed boost on `sha256` operations by building
-with OpenSSL.
-
-```
-$ maturin develop --release --features=openssl
-```
-
-
 To build the wheel, do
 
 ```
 $ maturin build --release
 ````
-
-or
-
-```
-$ maturin build --release --features=openssl
-```