feature: initial interface draft and basic RSA implementation

src/RSA.jl

@@ -0,0 +1,18 @@
+struct RSAKey
+    key_module::BigInt
+    key_component::BigInt
+    type:: AsymetricKeyType
+end
+
+function RSAStep(m::BigInt, e::BigInt, n::BigInt)
+    return (m ^ e) % n
+end
+
+function encrypt(msg, key::RSAKey)
+    return RSAStep(msg, key.key_component, key.key_module)
+end
+
+# Decryption using the private key
+function decrypt(msg, key::RSAKey)
+    return RSAStep(msg, key.key_component, key.key_module)
+end

src/ToyPublicKeys.jl

@@ -1,5 +1,7 @@
 module ToyPublicKeys
 
-# Write your package code here.
+@enum AsymetricKeyType public_key private_key
 
+include("RSA.jl")
+export RSAKey, encrypt, decrypt
 end

test/runtests.jl

@@ -2,5 +2,18 @@ using ToyPublicKeys
 using Test
 
 @testset "ToyPublicKeys.jl" begin
-    # Write your tests here.
+    n = big"3233"       # Example modulus
+    e = big"17"         # Example public exponent
+    d = big"2753"       # Example private exponent
+
+    public_key = ToyPublicKeys.RSAKey(n, e, ToyPublicKeys.public_key)
+    private_key = ToyPublicKeys.RSAKey(n, d, ToyPublicKeys.private_key)
+    msg = big"123"
+
+    encrypted = ToyPublicKeys.encrypt(msg, public_key)
+    println("Encrypted Message: $encrypted")
+
+    decrypted = ToyPublicKeys.decrypt(encrypted, private_key)
+    println("Decrypted Message: $decrypted")
+    encrypted == msg
 end