remove digital signature implementation

Author: WingZer0o

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "cas-lib"
-version = "0.2.76"
+version = "0.2.77"
 edition = "2021"
 description = "A function wrapper layer for RustCrypto and Dalek-Cryptography. Intended to be used in FFI situations with a global heap deallactor at the top level project."
 license = "Apache-2.0"

Cargo.toml

@@ -28,12 +28,6 @@ pub mod asymmetric {
     pub mod types;
 }
 
-pub mod digital_signature {
-    pub mod cas_digital_signature_rsa;
-    pub mod sha_512_rsa;
-    pub mod sha_256_rsa;
-}
-
 pub mod sponges {
     pub mod cas_ascon_aead;
     pub mod ascon_aead;