Remove the legacy RSA implementation

To avoid code duplication, use the superboring emulation layer instead.

This will allow us to easily move other cryptographic primitives
to using BoringSSL.

Cargo.toml

@@ -34,8 +34,7 @@ zeroize = "1.7.0"
 boring = "4.2.0"
 
 [target.'cfg(any(target_arch = "wasm32", target_arch = "wasm64"))'.dependencies]
-rsa = "0.8.2"
-spki = "0.6.0"
+superboring = "0.1.0"
 
 [dev-dependencies]
 benchmark-simple = "0.1.8"

src/algorithms/mod.rs

@@ -3,19 +3,11 @@ mod es256;
 mod es256k;
 mod es384;
 mod hmac;
-
-#[cfg(not(any(feature = "pure-rust", target_arch = "wasm32", target_arch = "wasm64")))]
 mod rsa;
-#[cfg(any(feature = "pure-rust", target_arch = "wasm32", target_arch = "wasm64"))]
-mod rsa_legacy;
 
 pub use self::eddsa::*;
 pub use self::es256::*;
 pub use self::es256k::*;
 pub use self::es384::*;
 pub use self::hmac::*;
-
-#[cfg(not(any(feature = "pure-rust", target_arch = "wasm32", target_arch = "wasm64")))]
 pub use self::rsa::*;
-#[cfg(any(feature = "pure-rust", target_arch = "wasm32", target_arch = "wasm64"))]
-pub use self::rsa_legacy::*;

src/algorithms/rsa.rs

@@ -1,3 +1,6 @@
+#[cfg(any(feature = "pure-rust", target_arch = "wasm32", target_arch = "wasm64"))]
+use superboring as boring;
+
 use boring::bn::BigNum;
 use boring::hash::MessageDigest;
 use boring::pkey::{PKey, Private, Public};