Add systemverilog class

SystemVerilog/README.md

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+# Advanced encryption standard (AES128, AES192, AES256) in SystemVerilog
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+# Purpose
+
+This directory migrating AES verilog code. Benefit for those who would like to integrate AES algorithm into UVM testbench or even higher level implementation on either ASIC design or design verification purpose
+
+# Methodology
+
+Since AES encryption and decryption are sharing some fundamental functions such as "Sbox" and "KeyExpension"
+All of the basic feature should be found under `aes_base.sv` file for further operation toward AES process
+Both `aes_encrypt.sv` and `aes_decrypt.sv` extends from `aes_base.sv`
+
+Note: This is not a IEEE SVUVM class/component
+Note: Default AES change from AES-128 to AES-256 for improvement
+
+# File structure
+
+AES files are wrapped with `aes_pkg.sv` package file, contains all files required in order.
+
+
+# Contribution
+
+Based on well established AES algorithm writing by @Michael Ehab and @Ibraam-Nashaat
+Just a miner improvement on this repo whatsoever.
+
+# Explanation:
+The Advanced Encryption Standard (AES) specifies a FIPS-approved
+cryptographic algorithm that can be used to protect electronic data. The AES algorithm is a
+symmetric block cipher that can encrypt (encipher) and decrypt (decipher) information.
+Encryption converts data to an unintelligible form called ciphertext; decrypting the ciphertext
+converts the data back into its original form, called plaintext.
+The AES algorithm is capable of using cryptographic keys of 128, 192, and 256 bits to encrypt
+and decrypt data in blocks of 128 bits
+
+
+# Usage
+
+**🔐Encryption: (AES_Encrypt module)**
+```SystemVerilog
+
+```
+
+**🔓Decryption: (AES_Decrypt module)**
+```SystemVerilog
+```
+
+**Testing: (AES wrapper module)**
+```SystemVerilog
+
+```
+
+# Verification Phase

SystemVerilog/aes.sv

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+`ifndef AES_SV
+`define AES_SV
+class aes;
+
+  string      name;
+  aes_base    ab;
+  AES_Encrypt ae;
+  AES_Decrypt ad;
+  int         aes_mode; // 3 : AES-256, 2 : AES-196, 1 : AES-128
+
+  function new(string name = "aes");
+    this.name = name;
+  endfunction
+
+  extern function void init_aes(int mode);
+endclass
+
+function void aes::init_aes(int mode);
+  aes_mode = mode;
+  ab       = new("aes_base");
+  ae       = new("aes_encrypt");
+  ad       = new("aes_decrypt");
+  ae.init_aes(mode);  // Encryption
+  ad.init_aes(mode);  // Decryption
+endfunction
+`endif // AES_SV