RSA constructor
      
      RSA({ 
    
    
- RSAPublicKey? publicKey,
- RSAPrivateKey? privateKey,
- RSAEncoding encoding = RSAEncoding.PKCS1,
- RSADigest digest = RSADigest.SHA1,
Implementation
RSA(
    {RSAPublicKey? publicKey,
    RSAPrivateKey? privateKey,
    RSAEncoding encoding = RSAEncoding.PKCS1,
    RSADigest digest = RSADigest.SHA1})
    : super(
        publicKey: publicKey,
        privateKey: privateKey,
        encoding: encoding,
        digest: digest,
      );