diff --git a/SystemVerilog/README.md b/SystemVerilog/README.md
new file mode 100644
index 0000000..d1bd8fe
--- /dev/null
+++ b/SystemVerilog/README.md
@@ -0,0 +1,60 @@
+# Advanced encryption standard (AES128, AES192, AES256) in SystemVerilog
+<!-- ![aes from Kekayan, Medium](https://user-images.githubusercontent.com/29122581/169694136-ca48f098-d5f5-448f-8016-4cb9a9b0e300.png)
+<div align="center">
+  
+  ![GitHub stars](https://img.shields.io/github/stars/michaelehab/AES-Verilog?style=plastic)
+  ![GitHub forks](https://img.shields.io/github/forks/michaelehab/AES-Verilog?style=plastic)
+  ![GitHub repo size](https://img.shields.io/github/repo-size/michaelehab/AES-Verilog?style=plastic)
+  ![GitHub top language](https://img.shields.io/github/languages/top/michaelehab/AES-Verilog?style=plastic)
+  
+</div> -->
+# 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
diff --git a/SystemVerilog/aes.sv b/SystemVerilog/aes.sv
new file mode 100644
index 0000000..a81887a
--- /dev/null
+++ b/SystemVerilog/aes.sv
@@ -0,0 +1,26 @@
+`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
\ No newline at end of file
diff --git a/SystemVerilog/aes_base.sv b/SystemVerilog/aes_base.sv
new file mode 100644
index 0000000..b8a8454
--- /dev/null
+++ b/SystemVerilog/aes_base.sv
@@ -0,0 +1,738 @@
+`ifndef AES_BASE_SV
+`define AES_BASE_SV
+class aes_base;
+
+  string name;
+  int    aes_key_length;
+  int    nk, nr;
+
+  function new(string name = "aes_base");
+    this.name = name;
+  endfunction
+  
+  extern function void init_aes(int mode);
+  extern function bit[0:31] rotword(bit[0:31] x);
+  extern function bit[0:31] subwordx(bit[0:31] a);
+  extern function void addRoundKey(bit[127:0] data, bit[127:0] key, ref bit[127:0] out);
+  // Encryption
+  extern function void subBytes(bit[127:0] in, ref bit[127:0] out);
+  extern function void shiftRows(bit[127:0] in, ref bit[127:0] out);
+  extern function void mixColumns(bit[127:0] in, ref bit[127:0] out);
+  // Decryption
+  extern function void inverseSubBytes(bit[127:0] in, ref bit[127:0] out);
+  extern function void inverseShiftRows(bit[127:0] in, ref bit[127:0] out);
+  extern function void inverseMixColumns(bit[127:0] in, ref bit[127:0] out);
+  // Common ground
+  extern function bit[7:0] multiply(bit[7:0] x, int n);
+  extern function bit[7:0] mb2(bit[7:0] x);
+  extern function bit[7:0] mb3(bit[7:0] x);
+  extern function bit[7:0] mb0e(bit[7:0] x);
+  extern function bit[7:0] mb0d(bit[7:0] x);
+  extern function bit[7:0] mb0b(bit[7:0] x);
+  extern function bit[7:0] mb09(bit[7:0] x);
+  extern function bit[0:31] rconx(bit[0:3] in);
+  extern function bit[0:7] sbox(bit[0:7] C);
+  extern function bit[0:7] inverseSbox(bit[0:7] C);
+  extern function bit[1919: 0] keyExpansion( bit[255:0] key );
+
+endclass
+
+function void aes_base::init_aes(int mode);
+  case(mode)
+    1: aes_key_length = 128;
+    2: aes_key_length = 196;
+    3: aes_key_length = 256;
+  endcase
+endfunction
+
+function bit[0:31] aes_base::rotword(bit[0:31] x);
+  rotword={x[8:31],x[0:7]};
+endfunction
+
+function bit[0:31] aes_base::subwordx(bit[0:31] a);
+  subwordx[0:7]   = sbox(a[0:7]);
+  subwordx[8:15]  = sbox(a[8:15]);
+  subwordx[16:23]  = sbox(a[16:23]);
+  subwordx[24:31]  = sbox(a[24:31]);
+endfunction
+
+function void aes_base::addRoundKey(bit[127:0] data, bit[127:0] key, ref bit[127:0] out);
+  out = key ^ data;
+endfunction
+
+function void aes_base::subBytes(bit[127:0] in, ref bit[127:0] out);
+  for(int ii = 0; ii < 128; ii += 8)
+  begin
+    out[ii +: 8] = sbox(in[ii +: 8]);
+  end
+endfunction
+
+function void aes_base::shiftRows(bit[127:0] in, ref bit[127:0] out);
+  // First row (r = 0) is not shifted
+  out[0+:8]  = in[0+:8];
+  out[32+:8] = in[32+:8];
+  out[64+:8] = in[64+:8];
+  out[96+:8] = in[96+:8];
+  
+  // Second row (r = 1) is cyclically left shifted by 1 offset
+  out[8+:8]   = in[40+:8];
+  out[40+:8]  = in[72+:8];
+  out[72+:8]  = in[104+:8];
+  out[104+:8] = in[8+:8];
+  
+  // Third row (r = 2) is cyclically left shifted by 2 offsets
+  out[16+:8]  = in[80+:8];
+  out[48+:8]  = in[112+:8];
+  out[80+:8]  = in[16+:8];
+  out[112+:8] = in[48+:8];
+  
+  // Fourth row (r = 3) is cyclically left shifted by 3 offsets
+  out[24+:8]  = in[120+:8];
+  out[56+:8]  = in[24+:8];
+  out[88+:8]  = in[56+:8];
+  out[120+:8] = in[88+:8];
+endfunction
+
+function void aes_base::mixColumns(bit[127:0] in, ref bit[127:0] out);
+  for(int ii = 0; ii < 4; ii += 1) begin
+    out[(ii*32 + 24)+:8]  = mb2(in[(ii*32 + 24)+:8]) ^ mb3(in[(ii*32 + 16)+:8]) ^ in[(ii*32 + 8)+:8] ^ in[ii*32+:8];
+    out[(ii*32 + 16)+:8]  = in[(ii*32 + 24)+:8] ^ mb2(in[(ii*32 + 16)+:8]) ^ mb3(in[(ii*32 + 8)+:8]) ^ in[ii*32+:8];
+    out[(ii*32 + 8) +:24] = in[(ii*32 + 24)+:8] ^ in[(ii*32 + 16)+:8] ^ mb2(in[(ii*32 + 8)+:8]) ^ mb3(in[ii*32+:8]);
+    out[ ii*32      +:8]  = mb3(in[(ii*32 + 24)+:8]) ^ in[(ii*32 + 16)+:8] ^ in[(ii*32 + 8)+:8] ^ mb2(in[ii*32+:8]);
+  end
+endfunction
+
+function void aes_base::inverseSubBytes(bit[127:0] in, ref bit[127:0] out);
+  for(int ii = 0; ii < 128; ii+=8) begin
+    out[ii +: 8] = inverseSbox(in[ii +: 8]);
+  end
+endfunction
+
+function void aes_base::inverseShiftRows(bit[127:0] in, ref bit[127:0] out);
+  // First row (r = 0) is not shifted
+  out[0+:8]  = in[0+:8];
+  out[32+:8] = in[32+:8];
+  out[64+:8] = in[64+:8];
+  out[96+:8] = in[96+:8];
+  
+  // Second row (r = 1) is cyclically left shifted by 1 offset
+  out[8+:8]   = in[104+:8];
+  out[40+:8]  = in[8+:8];
+  out[72+:8]  = in[40+:8];
+  out[104+:8] = in[72+:8];
+  
+  // Third row (r = 2) is cyclically left shifted by 2 offsets
+  out[16+:8]  = in[80+:8];
+  out[48+:8]  = in[112+:8];
+  out[80+:8]  = in[16+:8];
+  out[112+:8] = in[48+:8];
+  
+  // Fourth row (r = 3) is cyclically left shifted by 3 offsets
+  out[24+:8]  = in[56+:8];
+  out[56+:8]  = in[88+:8];
+  out[88+:8]  = in[120+:8];
+  out[120+:8] = in[24+:8];
+endfunction
+
+function void aes_base::inverseMixColumns(bit[127:0] in, ref bit[127:0] out);
+  for(int ii = 0; ii < 4; ii += 1) begin
+    out[(ii*32 + 24)+:8] = mb0e(in[(ii*32 + 24)+:8]) ^ mb0b(in[(ii*32 + 16)+:8]) ^ mb0d(in[(ii*32 + 8)+:8]) ^ mb09(in[ii*32+:8]);
+    out[(ii*32 + 16)+:8] = mb09(in[(ii*32 + 24)+:8]) ^ mb0e(in[(ii*32 + 16)+:8]) ^ mb0b(in[(ii*32 + 8)+:8]) ^ mb0d(in[ii*32+:8]);
+    out[(ii*32 + 8) +:8] = mb0d(in[(ii*32 + 24)+:8]) ^ mb09(in[(ii*32 + 16)+:8]) ^ mb0e(in[(ii*32 + 8)+:8]) ^ mb0b(in[ii*32+:8]);
+    out[ ii*32      +:8] = mb0b(in[(ii*32 + 24)+:8]) ^ mb0d(in[(ii*32 + 16)+:8]) ^ mb09(in[(ii*32 + 8)+:8]) ^ mb0e(in[ii*32+:8]);
+  end
+endfunction
+
+function bit[7:0] aes_base::multiply(bit[7:0] x, int n);
+  for(int ii = 0; ii < n; ii += 1) begin
+    if(x[7]) x = ((x << 1) ^ 8'h1b);
+    else x = x << 1;
+  end
+  multiply = x;
+endfunction
+
+function bit[7:0] aes_base::mb2(bit[7:0] x);
+  if(x[7]) mb2 = ((x << 1) ^ 8'h1b);
+  else mb2 = x << 1;
+endfunction
+
+function bit[7:0] aes_base::mb3(bit[7:0] x);
+   mb3 = mb2(x) ^ x;
+endfunction
+
+function bit[7:0] aes_base::mb0e(bit[7:0] x); mb0e = multiply(x,3) ^ multiply(x,2) ^ multiply(x,1); endfunction
+function bit[7:0] aes_base::mb0d(bit[7:0] x); mb0d = multiply(x,3) ^ multiply(x,2) ^ x;             endfunction
+function bit[7:0] aes_base::mb0b(bit[7:0] x); mb0b = multiply(x,3) ^ multiply(x,1) ^ x;             endfunction
+function bit[7:0] aes_base::mb09(bit[7:0] x); mb09 = multiply(x,3) ^ x;                             endfunction
+
+function bit[0:31] aes_base::rconx(bit[0:3] in);
+  case(in)
+    4'h1:     rconx=32'h01000000;
+    4'h2:     rconx=32'h02000000;
+    4'h3:     rconx=32'h04000000;
+    4'h4:     rconx=32'h08000000;
+    4'h5:     rconx=32'h10000000;
+    4'h6:     rconx=32'h20000000;
+    4'h7:     rconx=32'h40000000;
+    4'h8:     rconx=32'h80000000;
+    4'h9:     rconx=32'h1b000000;
+    4'ha:     rconx=32'h36000000;
+    default:  rconx=32'h00000000;
+  endcase
+endfunction
+
+function bit[0:7] aes_base::sbox(bit[0:7] C);
+  case (C)
+    8'h00: sbox=8'h63;
+    8'h01: sbox=8'h7c;
+    8'h02: sbox=8'h77;
+    8'h03: sbox=8'h7b;
+    8'h04: sbox=8'hf2;
+    8'h05: sbox=8'h6b;
+    8'h06: sbox=8'h6f;
+    8'h07: sbox=8'hc5;
+    8'h08: sbox=8'h30;
+    8'h09: sbox=8'h01;
+    8'h0a: sbox=8'h67;
+    8'h0b: sbox=8'h2b;
+    8'h0c: sbox=8'hfe;
+    8'h0d: sbox=8'hd7;
+    8'h0e: sbox=8'hab;
+    8'h0f: sbox=8'h76;
+    8'h10: sbox=8'hca;
+    8'h11: sbox=8'h82;
+    8'h12: sbox=8'hc9;
+    8'h13: sbox=8'h7d;
+    8'h14: sbox=8'hfa;
+    8'h15: sbox=8'h59;
+    8'h16: sbox=8'h47;
+    8'h17: sbox=8'hf0;
+    8'h18: sbox=8'had;
+    8'h19: sbox=8'hd4;
+    8'h1a: sbox=8'ha2;
+    8'h1b: sbox=8'haf;
+    8'h1c: sbox=8'h9c;
+    8'h1d: sbox=8'ha4;
+    8'h1e: sbox=8'h72;
+    8'h1f: sbox=8'hc0;
+    8'h20: sbox=8'hb7;
+    8'h21: sbox=8'hfd;
+    8'h22: sbox=8'h93;
+    8'h23: sbox=8'h26;
+    8'h24: sbox=8'h36;
+    8'h25: sbox=8'h3f;
+    8'h26: sbox=8'hf7;
+    8'h27: sbox=8'hcc;
+    8'h28: sbox=8'h34;
+    8'h29: sbox=8'ha5;
+    8'h2a: sbox=8'he5;
+    8'h2b: sbox=8'hf1;
+    8'h2c: sbox=8'h71;
+    8'h2d: sbox=8'hd8;
+    8'h2e: sbox=8'h31;
+    8'h2f: sbox=8'h15;
+    8'h30: sbox=8'h04;
+    8'h31: sbox=8'hc7;
+    8'h32: sbox=8'h23;
+    8'h33: sbox=8'hc3;
+    8'h34: sbox=8'h18;
+    8'h35: sbox=8'h96;
+    8'h36: sbox=8'h05;
+    8'h37: sbox=8'h9a;
+    8'h38: sbox=8'h07;
+    8'h39: sbox=8'h12;
+    8'h3a: sbox=8'h80;
+    8'h3b: sbox=8'he2;
+    8'h3c: sbox=8'heb;
+    8'h3d: sbox=8'h27;
+    8'h3e: sbox=8'hb2;
+    8'h3f: sbox=8'h75;
+    8'h40: sbox=8'h09;
+    8'h41: sbox=8'h83;
+    8'h42: sbox=8'h2c;
+    8'h43: sbox=8'h1a;
+    8'h44: sbox=8'h1b;
+    8'h45: sbox=8'h6e;
+    8'h46: sbox=8'h5a;
+    8'h47: sbox=8'ha0;
+    8'h48: sbox=8'h52;
+    8'h49: sbox=8'h3b;
+    8'h4a: sbox=8'hd6;
+    8'h4b: sbox=8'hb3;
+    8'h4c: sbox=8'h29;
+    8'h4d: sbox=8'he3;
+    8'h4e: sbox=8'h2f;
+    8'h4f: sbox=8'h84;
+    8'h50: sbox=8'h53;
+    8'h51: sbox=8'hd1;
+    8'h52: sbox=8'h00;
+    8'h53: sbox=8'hed;
+    8'h54: sbox=8'h20;
+    8'h55: sbox=8'hfc;
+    8'h56: sbox=8'hb1;
+    8'h57: sbox=8'h5b;
+    8'h58: sbox=8'h6a;
+    8'h59: sbox=8'hcb;
+    8'h5a: sbox=8'hbe;
+    8'h5b: sbox=8'h39;
+    8'h5c: sbox=8'h4a;
+    8'h5d: sbox=8'h4c;
+    8'h5e: sbox=8'h58;
+    8'h5f: sbox=8'hcf;
+    8'h60: sbox=8'hd0;
+    8'h61: sbox=8'hef;
+    8'h62: sbox=8'haa;
+    8'h63: sbox=8'hfb;
+    8'h64: sbox=8'h43;
+    8'h65: sbox=8'h4d;
+    8'h66: sbox=8'h33;
+    8'h67: sbox=8'h85;
+    8'h68: sbox=8'h45;
+    8'h69: sbox=8'hf9;
+    8'h6a: sbox=8'h02;
+    8'h6b: sbox=8'h7f;
+    8'h6c: sbox=8'h50;
+    8'h6d: sbox=8'h3c;
+    8'h6e: sbox=8'h9f;
+    8'h6f: sbox=8'ha8;
+    8'h70: sbox=8'h51;
+    8'h71: sbox=8'ha3;
+    8'h72: sbox=8'h40;
+    8'h73: sbox=8'h8f;
+    8'h74: sbox=8'h92;
+    8'h75: sbox=8'h9d;
+    8'h76: sbox=8'h38;
+    8'h77: sbox=8'hf5;
+    8'h78: sbox=8'hbc;
+    8'h79: sbox=8'hb6;
+    8'h7a: sbox=8'hda;
+    8'h7b: sbox=8'h21;
+    8'h7c: sbox=8'h10;
+    8'h7d: sbox=8'hff;
+    8'h7e: sbox=8'hf3;
+    8'h7f: sbox=8'hd2;
+    8'h80: sbox=8'hcd;
+    8'h81: sbox=8'h0c;
+    8'h82: sbox=8'h13;
+    8'h83: sbox=8'hec;
+    8'h84: sbox=8'h5f;
+    8'h85: sbox=8'h97;
+    8'h86: sbox=8'h44;
+    8'h87: sbox=8'h17;
+    8'h88: sbox=8'hc4;
+    8'h89: sbox=8'ha7;
+    8'h8a: sbox=8'h7e;
+    8'h8b: sbox=8'h3d;
+    8'h8c: sbox=8'h64;
+    8'h8d: sbox=8'h5d;
+    8'h8e: sbox=8'h19;
+    8'h8f: sbox=8'h73;
+    8'h90: sbox=8'h60;
+    8'h91: sbox=8'h81;
+    8'h92: sbox=8'h4f;
+    8'h93: sbox=8'hdc;
+    8'h94: sbox=8'h22;
+    8'h95: sbox=8'h2a;
+    8'h96: sbox=8'h90;
+    8'h97: sbox=8'h88;
+    8'h98: sbox=8'h46;
+    8'h99: sbox=8'hee;
+    8'h9a: sbox=8'hb8;
+    8'h9b: sbox=8'h14;
+    8'h9c: sbox=8'hde;
+    8'h9d: sbox=8'h5e;
+    8'h9e: sbox=8'h0b;
+    8'h9f: sbox=8'hdb;
+    8'ha0: sbox=8'he0;
+    8'ha1: sbox=8'h32;
+    8'ha2: sbox=8'h3a;
+    8'ha3: sbox=8'h0a;
+    8'ha4: sbox=8'h49;
+    8'ha5: sbox=8'h06;
+    8'ha6: sbox=8'h24;
+    8'ha7: sbox=8'h5c;
+    8'ha8: sbox=8'hc2;
+    8'ha9: sbox=8'hd3;
+    8'haa: sbox=8'hac;
+    8'hab: sbox=8'h62;
+    8'hac: sbox=8'h91;
+    8'had: sbox=8'h95;
+    8'hae: sbox=8'he4;
+    8'haf: sbox=8'h79;
+    8'hb0: sbox=8'he7;
+    8'hb1: sbox=8'hc8;
+    8'hb2: sbox=8'h37;
+    8'hb3: sbox=8'h6d;
+    8'hb4: sbox=8'h8d;
+    8'hb5: sbox=8'hd5;
+    8'hb6: sbox=8'h4e;
+    8'hb7: sbox=8'ha9;
+    8'hb8: sbox=8'h6c;
+    8'hb9: sbox=8'h56;
+    8'hba: sbox=8'hf4;
+    8'hbb: sbox=8'hea;
+    8'hbc: sbox=8'h65;
+    8'hbd: sbox=8'h7a;
+    8'hbe: sbox=8'hae;
+    8'hbf: sbox=8'h08;
+    8'hc0: sbox=8'hba;
+    8'hc1: sbox=8'h78;
+    8'hc2: sbox=8'h25;
+    8'hc3: sbox=8'h2e;
+    8'hc4: sbox=8'h1c;
+    8'hc5: sbox=8'ha6;
+    8'hc6: sbox=8'hb4;
+    8'hc7: sbox=8'hc6;
+    8'hc8: sbox=8'he8;
+    8'hc9: sbox=8'hdd;
+    8'hca: sbox=8'h74;
+    8'hcb: sbox=8'h1f;
+    8'hcc: sbox=8'h4b;
+    8'hcd: sbox=8'hbd;
+    8'hce: sbox=8'h8b;
+    8'hcf: sbox=8'h8a;
+    8'hd0: sbox=8'h70;
+    8'hd1: sbox=8'h3e;
+    8'hd2: sbox=8'hb5;
+    8'hd3: sbox=8'h66;
+    8'hd4: sbox=8'h48;
+    8'hd5: sbox=8'h03;
+    8'hd6: sbox=8'hf6;
+    8'hd7: sbox=8'h0e;
+    8'hd8: sbox=8'h61;
+    8'hd9: sbox=8'h35;
+    8'hda: sbox=8'h57;
+    8'hdb: sbox=8'hb9;
+    8'hdc: sbox=8'h86;
+    8'hdd: sbox=8'hc1;
+    8'hde: sbox=8'h1d;
+    8'hdf: sbox=8'h9e;
+    8'he0: sbox=8'he1;
+    8'he1: sbox=8'hf8;
+    8'he2: sbox=8'h98;
+    8'he3: sbox=8'h11;
+    8'he4: sbox=8'h69;
+    8'he5: sbox=8'hd9;
+    8'he6: sbox=8'h8e;
+    8'he7: sbox=8'h94;
+    8'he8: sbox=8'h9b;
+    8'he9: sbox=8'h1e;
+    8'hea: sbox=8'h87;
+    8'heb: sbox=8'he9;
+    8'hec: sbox=8'hce;
+    8'hed: sbox=8'h55;
+    8'hee: sbox=8'h28;
+    8'hef: sbox=8'hdf;
+    8'hf0: sbox=8'h8c;
+    8'hf1: sbox=8'ha1;
+    8'hf2: sbox=8'h89;
+    8'hf3: sbox=8'h0d;
+    8'hf4: sbox=8'hbf;
+    8'hf5: sbox=8'he6;
+    8'hf6: sbox=8'h42;
+    8'hf7: sbox=8'h68;
+    8'hf8: sbox=8'h41;
+    8'hf9: sbox=8'h99;
+    8'hfa: sbox=8'h2d;
+    8'hfb: sbox=8'h0f;
+    8'hfc: sbox=8'hb0;
+    8'hfd: sbox=8'h54;
+    8'hfe: sbox=8'hbb;
+    8'hff: sbox=8'h16;
+  endcase
+endfunction
+
+function bit[0:7] aes_base::inverseSbox(bit[0:7] C);
+  case(C)
+    8'h00: inverseSbox = 8'h52;
+    8'h01: inverseSbox = 8'h09;
+    8'h02: inverseSbox = 8'h6a;
+    8'h03: inverseSbox = 8'hd5;
+    8'h04: inverseSbox = 8'h30;
+    8'h05: inverseSbox = 8'h36;
+    8'h06: inverseSbox = 8'ha5;
+    8'h07: inverseSbox = 8'h38;
+    8'h08: inverseSbox = 8'hbf;
+    8'h09: inverseSbox = 8'h40;
+    8'h0a: inverseSbox = 8'ha3;
+    8'h0b: inverseSbox = 8'h9e;
+    8'h0c: inverseSbox = 8'h81;
+    8'h0d: inverseSbox = 8'hf3;
+    8'h0e: inverseSbox = 8'hd7;
+    8'h0f: inverseSbox = 8'hfb;
+    8'h10: inverseSbox = 8'h7c;
+    8'h11: inverseSbox = 8'he3;
+    8'h12: inverseSbox = 8'h39;
+    8'h13: inverseSbox = 8'h82;
+    8'h14: inverseSbox = 8'h9b;
+    8'h15: inverseSbox = 8'h2f;
+    8'h16: inverseSbox = 8'hff;
+    8'h17: inverseSbox = 8'h87;
+    8'h18: inverseSbox = 8'h34;
+    8'h19: inverseSbox = 8'h8e;
+    8'h1a: inverseSbox = 8'h43;
+    8'h1b: inverseSbox = 8'h44;
+    8'h1c: inverseSbox = 8'hc4;
+    8'h1d: inverseSbox = 8'hde;
+    8'h1e: inverseSbox = 8'he9;
+    8'h1f: inverseSbox = 8'hcb;
+    8'h20: inverseSbox = 8'h54;
+    8'h21: inverseSbox = 8'h7b;
+    8'h22: inverseSbox = 8'h94;
+    8'h23: inverseSbox = 8'h32;
+    8'h24: inverseSbox = 8'ha6;
+    8'h25: inverseSbox = 8'hc2;
+    8'h26: inverseSbox = 8'h23;
+    8'h27: inverseSbox = 8'h3d;
+    8'h28: inverseSbox = 8'hee;
+    8'h29: inverseSbox = 8'h4c;
+    8'h2a: inverseSbox = 8'h95;
+    8'h2b: inverseSbox = 8'h0b;
+    8'h2c: inverseSbox = 8'h42;
+    8'h2d: inverseSbox = 8'hfa;
+    8'h2e: inverseSbox = 8'hc3;
+    8'h2f: inverseSbox = 8'h4e;
+    8'h30: inverseSbox = 8'h08;
+    8'h31: inverseSbox = 8'h2e;
+    8'h32: inverseSbox = 8'ha1;
+    8'h33: inverseSbox = 8'h66;
+    8'h34: inverseSbox = 8'h28;
+    8'h35: inverseSbox = 8'hd9;
+    8'h36: inverseSbox = 8'h24;
+    8'h37: inverseSbox = 8'hb2;
+    8'h38: inverseSbox = 8'h76;
+    8'h39: inverseSbox = 8'h5b;
+    8'h3a: inverseSbox = 8'ha2;
+    8'h3b: inverseSbox = 8'h49;
+    8'h3c: inverseSbox = 8'h6d;
+    8'h3d: inverseSbox = 8'h8b;
+    8'h3e: inverseSbox = 8'hd1;
+    8'h3f: inverseSbox = 8'h25;
+    8'h40: inverseSbox = 8'h72;
+    8'h41: inverseSbox = 8'hf8;
+    8'h42: inverseSbox = 8'hf6;
+    8'h43: inverseSbox = 8'h64;
+    8'h44: inverseSbox = 8'h86;
+    8'h45: inverseSbox = 8'h68;
+    8'h46: inverseSbox = 8'h98;
+    8'h47: inverseSbox = 8'h16;
+    8'h48: inverseSbox = 8'hd4;
+    8'h49: inverseSbox = 8'ha4;
+    8'h4a: inverseSbox = 8'h5c;
+    8'h4b: inverseSbox = 8'hcc;
+    8'h4c: inverseSbox = 8'h5d;
+    8'h4d: inverseSbox = 8'h65;
+    8'h4e: inverseSbox = 8'hb6;
+    8'h4f: inverseSbox = 8'h92;
+    8'h50: inverseSbox = 8'h6c;
+    8'h51: inverseSbox = 8'h70;
+    8'h52: inverseSbox = 8'h48;
+    8'h53: inverseSbox = 8'h50;
+    8'h54: inverseSbox = 8'hfd;
+    8'h55: inverseSbox = 8'hed;
+    8'h56: inverseSbox = 8'hb9;
+    8'h57: inverseSbox = 8'hda;
+    8'h58: inverseSbox = 8'h5e;
+    8'h59: inverseSbox = 8'h15;
+    8'h5a: inverseSbox = 8'h46;
+    8'h5b: inverseSbox = 8'h57;
+    8'h5c: inverseSbox = 8'ha7;
+    8'h5d: inverseSbox = 8'h8d;
+    8'h5e: inverseSbox = 8'h9d;
+    8'h5f: inverseSbox = 8'h84;
+    8'h60: inverseSbox = 8'h90;
+    8'h61: inverseSbox = 8'hd8;
+    8'h62: inverseSbox = 8'hab;
+    8'h63: inverseSbox = 8'h00;
+    8'h64: inverseSbox = 8'h8c;
+    8'h65: inverseSbox = 8'hbc;
+    8'h66: inverseSbox = 8'hd3;
+    8'h67: inverseSbox = 8'h0a;
+    8'h68: inverseSbox = 8'hf7;
+    8'h69: inverseSbox = 8'he4;
+    8'h6a: inverseSbox = 8'h58;
+    8'h6b: inverseSbox = 8'h05;
+    8'h6c: inverseSbox = 8'hb8;
+    8'h6d: inverseSbox = 8'hb3;
+    8'h6e: inverseSbox = 8'h45;
+    8'h6f: inverseSbox = 8'h06;
+    8'h70: inverseSbox = 8'hd0;
+    8'h71: inverseSbox = 8'h2c;
+    8'h72: inverseSbox = 8'h1e;
+    8'h73: inverseSbox = 8'h8f;
+    8'h74: inverseSbox = 8'hca;
+    8'h75: inverseSbox = 8'h3f;
+    8'h76: inverseSbox = 8'h0f;
+    8'h77: inverseSbox = 8'h02;
+    8'h78: inverseSbox = 8'hc1;
+    8'h79: inverseSbox = 8'haf;
+    8'h7a: inverseSbox = 8'hbd;
+    8'h7b: inverseSbox = 8'h03;
+    8'h7c: inverseSbox = 8'h01;
+    8'h7d: inverseSbox = 8'h13;
+    8'h7e: inverseSbox = 8'h8a;
+    8'h7f: inverseSbox = 8'h6b;
+    8'h80: inverseSbox = 8'h3a;
+    8'h81: inverseSbox = 8'h91;
+    8'h82: inverseSbox = 8'h11;
+    8'h83: inverseSbox = 8'h41;
+    8'h84: inverseSbox = 8'h4f;
+    8'h85: inverseSbox = 8'h67;
+    8'h86: inverseSbox = 8'hdc;
+    8'h87: inverseSbox = 8'hea;
+    8'h88: inverseSbox = 8'h97;
+    8'h89: inverseSbox = 8'hf2;
+    8'h8a: inverseSbox = 8'hcf;
+    8'h8b: inverseSbox = 8'hce;
+    8'h8c: inverseSbox = 8'hf0;
+    8'h8d: inverseSbox = 8'hb4;
+    8'h8e: inverseSbox = 8'he6;
+    8'h8f: inverseSbox = 8'h73;
+    8'h90: inverseSbox = 8'h96;
+    8'h91: inverseSbox = 8'hac;
+    8'h92: inverseSbox = 8'h74;
+    8'h93: inverseSbox = 8'h22;
+    8'h94: inverseSbox = 8'he7;
+    8'h95: inverseSbox = 8'had;
+    8'h96: inverseSbox = 8'h35;
+    8'h97: inverseSbox = 8'h85;
+    8'h98: inverseSbox = 8'he2;
+    8'h99: inverseSbox = 8'hf9;
+    8'h9a: inverseSbox = 8'h37;
+    8'h9b: inverseSbox = 8'he8;
+    8'h9c: inverseSbox = 8'h1c;
+    8'h9d: inverseSbox = 8'h75;
+    8'h9e: inverseSbox = 8'hdf;
+    8'h9f: inverseSbox = 8'h6e;
+    8'ha0: inverseSbox = 8'h47;
+    8'ha1: inverseSbox = 8'hf1;
+    8'ha2: inverseSbox = 8'h1a;
+    8'ha3: inverseSbox = 8'h71;
+    8'ha4: inverseSbox = 8'h1d;
+    8'ha5: inverseSbox = 8'h29;
+    8'ha6: inverseSbox = 8'hc5;
+    8'ha7: inverseSbox = 8'h89;
+    8'ha8: inverseSbox = 8'h6f;
+    8'ha9: inverseSbox = 8'hb7;
+    8'haa: inverseSbox = 8'h62;
+    8'hab: inverseSbox = 8'h0e;
+    8'hac: inverseSbox = 8'haa;
+    8'had: inverseSbox = 8'h18;
+    8'hae: inverseSbox = 8'hbe;
+    8'haf: inverseSbox = 8'h1b;
+    8'hb0: inverseSbox = 8'hfc;
+    8'hb1: inverseSbox = 8'h56;
+    8'hb2: inverseSbox = 8'h3e;
+    8'hb3: inverseSbox = 8'h4b;
+    8'hb4: inverseSbox = 8'hc6;
+    8'hb5: inverseSbox = 8'hd2;
+    8'hb6: inverseSbox = 8'h79;
+    8'hb7: inverseSbox = 8'h20;
+    8'hb8: inverseSbox = 8'h9a;
+    8'hb9: inverseSbox = 8'hdb;
+    8'hba: inverseSbox = 8'hc0;
+    8'hbb: inverseSbox = 8'hfe;
+    8'hbc: inverseSbox = 8'h78;
+    8'hbd: inverseSbox = 8'hcd;
+    8'hbe: inverseSbox = 8'h5a;
+    8'hbf: inverseSbox = 8'hf4;
+    8'hc0: inverseSbox = 8'h1f;
+    8'hc1: inverseSbox = 8'hdd;
+    8'hc2: inverseSbox = 8'ha8;
+    8'hc3: inverseSbox = 8'h33;
+    8'hc4: inverseSbox = 8'h88;
+    8'hc5: inverseSbox = 8'h07;
+    8'hc6: inverseSbox = 8'hc7;
+    8'hc7: inverseSbox = 8'h31;
+    8'hc8: inverseSbox = 8'hb1;
+    8'hc9: inverseSbox = 8'h12;
+    8'hca: inverseSbox = 8'h10;
+    8'hcb: inverseSbox = 8'h59;
+    8'hcc: inverseSbox = 8'h27;
+    8'hcd: inverseSbox = 8'h80;
+    8'hce: inverseSbox = 8'hec;
+    8'hcf: inverseSbox = 8'h5f;
+    8'hd0: inverseSbox = 8'h60;
+    8'hd1: inverseSbox = 8'h51;
+    8'hd2: inverseSbox = 8'h7f;
+    8'hd3: inverseSbox = 8'ha9;
+    8'hd4: inverseSbox = 8'h19;
+    8'hd5: inverseSbox = 8'hb5;
+    8'hd6: inverseSbox = 8'h4a;
+    8'hd7: inverseSbox = 8'h0d;
+    8'hd8: inverseSbox = 8'h2d;
+    8'hd9: inverseSbox = 8'he5;
+    8'hda: inverseSbox = 8'h7a;
+    8'hdb: inverseSbox = 8'h9f;
+    8'hdc: inverseSbox = 8'h93;
+    8'hdd: inverseSbox = 8'hc9;
+    8'hde: inverseSbox = 8'h9c;
+    8'hdf: inverseSbox = 8'hef;
+    8'he0: inverseSbox = 8'ha0;
+    8'he1: inverseSbox = 8'he0;
+    8'he2: inverseSbox = 8'h3b;
+    8'he3: inverseSbox = 8'h4d;
+    8'he4: inverseSbox = 8'hae;
+    8'he5: inverseSbox = 8'h2a;
+    8'he6: inverseSbox = 8'hf5;
+    8'he7: inverseSbox = 8'hb0;
+    8'he8: inverseSbox = 8'hc8;
+    8'he9: inverseSbox = 8'heb;
+    8'hea: inverseSbox = 8'hbb;
+    8'heb: inverseSbox = 8'h3c;
+    8'hec: inverseSbox = 8'h83;
+    8'hed: inverseSbox = 8'h53;
+    8'hee: inverseSbox = 8'h99;
+    8'hef: inverseSbox = 8'h61;
+    8'hf0: inverseSbox = 8'h17;
+    8'hf1: inverseSbox = 8'h2b;
+    8'hf2: inverseSbox = 8'h04;
+    8'hf3: inverseSbox = 8'h7e;
+    8'hf4: inverseSbox = 8'hba;
+    8'hf5: inverseSbox = 8'h77;
+    8'hf6: inverseSbox = 8'hd6;
+    8'hf7: inverseSbox = 8'h26;
+    8'hf8: inverseSbox = 8'he1;
+    8'hf9: inverseSbox = 8'h69;
+    8'hfa: inverseSbox = 8'h14;
+    8'hfb: inverseSbox = 8'h63;
+    8'hfc: inverseSbox = 8'h55;
+    8'hfd: inverseSbox = 8'h21;
+    8'hfe: inverseSbox = 8'h0c;
+    8'hff: inverseSbox = 8'h7d;
+  endcase
+endfunction
+
+function bit[1919: 0] aes_base::keyExpansion( bit[255:0] key );
+
+  bit[1919: 0] w; // Word array for the key schedule
+  bit[  31: 0] temp;
+  bit[  31: 0] r;
+  bit[  31: 0] rot; // It stores the returned value from the function rotword().
+  bit[  31: 0] x;  //It stores the returned value from the function subwordx().
+  bit[  31: 0] rconv; //It stores the returned value from the function rconx().
+  bit[  31: 0] newKey;
+
+  //The first [(nk*32)-1 ]-bit key is stored in W.
+  w = key;    
+
+  for(int i = nk; i < 4*(nr + 1); i = i + 1) begin
+    temp = w[(128 * (nr + 1) - 32) +: 32]; // Start from w[1919:1888]
+    if(i % nk == 0) begin
+      rot = rotword(temp); // A call to the function rotword() is done and the returned value is stored in rot.
+      x = subwordx (rot);  //A call to the function subwordx() is done and the returned value is stored in x.
+      rconv = rconx (i/nk); //A call to the function rconx() is done and the returned value is stored in rconv.
+      temp = x ^ rconv;   
+    end
+    else if(nk >6 && i % nk == 4) begin
+      temp = subwordx(temp);
+    end
+    newKey = (w[(128 * (nr + 1) - (nk*32) ) +: 32] ^ temp);
+    // We would shift W by 32 bit to the left to add the new generated key word (new) at its end.
+    w = w << 32;
+    w = {w[1919 : 32], newKey};
+  end
+  keyExpansion = w;
+endfunction
+
+`endif // AES_BASE_SV
\ No newline at end of file
diff --git a/SystemVerilog/aes_decrypt.sv b/SystemVerilog/aes_decrypt.sv
new file mode 100644
index 0000000..a20d0e1
--- /dev/null
+++ b/SystemVerilog/aes_decrypt.sv
@@ -0,0 +1,45 @@
+`ifndef AES_DECRYPT_SV
+`define AES_DECRYPT_SV
+class AES_Decrypt #(parameter N=256,parameter Nr=14,parameter Nk=8) extends aes_base;
+
+  string                 name;
+  bit [(128*(Nr+1))-1:0] fullkeys;
+  bit [127:0]            states [Nr+1:0] ;
+  bit [127:0]            afterSubBytes;
+  bit [127:0]            afterShiftRows;
+
+  function new(string name="aes_decrypt");
+    this.name = name;
+    this.nk   = Nk;
+    this.nr   = Nr;
+  endfunction
+
+  extern function void decrypt(bit[N-1 : 0] key, bit[127 : 0] in, bit[127 : 0] out);
+  extern function decryptRound(bit[127:0] in, bit[127:0] key, ref bit[127:0] out);
+
+endclass
+
+function void AES_Decrypt::decrypt(bit[N-1 : 0] key, bit[127 : 0] in, bit[127 : 0] out);
+  fullkeys = keyExpansion(key);
+
+  for(int ii=1; ii<Nr ;ii=ii+1)begin
+    decryptRound(states[ii-1],fullkeys[ii*128+:128],states[ii]);
+  end
+  inverseShiftRows(states[Nr-1],afterShiftRows);
+  inverseSubBytes(afterShiftRows,afterSubBytes);
+  addRoundKey(afterSubBytes,fullkeys[((128*(Nr+1))-1)-:128],states[Nr]);
+endfunction
+
+function AES_Decrypt::decryptRound(bit[127:0] in, bit[127:0] key, ref bit[127:0] out);
+  bit [127:0] afterSubBytes;
+  bit [127:0] afterShiftRows;
+  bit [127:0] afterMixColumns;
+  bit [127:0] afterAddroundKey;
+
+  inverseShiftRows(in,afterShiftRows);
+  inverseSubBytes(afterShiftRows,afterSubBytes);
+  addRoundKey(afterSubBytes,key,afterAddroundKey);
+  inverseMixColumns(afterAddroundKey,out);
+
+endfunction
+`endif // AES_DECRYPT_SV
\ No newline at end of file
diff --git a/SystemVerilog/aes_define.sv b/SystemVerilog/aes_define.sv
new file mode 100644
index 0000000..1357520
--- /dev/null
+++ b/SystemVerilog/aes_define.sv
@@ -0,0 +1,4 @@
+// For mode selection
+`define AES256  3
+`define AES196  2
+`define AES128  1
\ No newline at end of file
diff --git a/SystemVerilog/aes_encrypt.sv b/SystemVerilog/aes_encrypt.sv
new file mode 100644
index 0000000..f2edbcf
--- /dev/null
+++ b/SystemVerilog/aes_encrypt.sv
@@ -0,0 +1,46 @@
+`ifndef AES_ENCRYPT_SV
+`define AES_ENCRYPT_SV
+class AES_Encrypt #(parameter N=256,parameter Nr=14,parameter Nk=8) extends aes_base;
+
+  string                 name;
+  bit [(128*(Nr+1))-1:0] fullkeys;
+  bit [127:0]            states [Nr+1:0] ;
+  bit [127:0]            afterSubBytes;
+  bit [127:0]            afterShiftRows;
+
+  function new(string name="aes_encrypt");
+    this.name = name;
+    this.nk   = Nk;
+    this.nr   = Nr;
+  endfunction
+
+  extern function void encrypt(bit[N-1 : 0] key, bit[127 : 0] in, bit[127 : 0] out);
+  extern function encryptRound(bit[127:0] in, bit[127:0] key, ref bit[127:0] out);
+
+endclass
+
+function void AES_Encrypt::encrypt(bit[N-1 : 0] key, bit[127 : 0] in, bit[127 : 0] out);
+  fullkeys = keyExpansion(key);
+  addRoundKey(in,fullkeys[((N*(Nr+1))-1)-:N],states[0]); // bit[127:0] data, bit[127:0] key, ref bit[127:0] out
+  for(int ii=1; ii<Nr ;ii=ii+1) begin
+    encryptRound(states[ii-1],fullkeys[(((N*(Nr+1))-1)-N*ii)-:N],states[ii]);
+  end
+  subBytes(states[Nr-1],afterSubBytes);
+  shiftRows(afterSubBytes,afterShiftRows);
+  addRoundKey(afterShiftRows,fullkeys[N-1:0],states[Nr]);
+endfunction
+
+function AES_Encrypt::encryptRound(bit[127:0] in, bit[127:0] key, ref bit[127:0] out);
+  bit[127:0] afterSubBytes;
+  bit[127:0] afterShiftRows;
+  bit[127:0] afterMixColumns;
+  bit[127:0] afterAddroundKey;
+
+  subBytes(in,afterSubBytes);
+  shiftRows(afterSubBytes,afterShiftRows);
+  mixColumns(afterShiftRows,afterMixColumns);
+  addRoundKey(afterMixColumns,key,out);
+		
+endfunction
+
+`endif // AES_ENCRYPT_SV
\ No newline at end of file
diff --git a/SystemVerilog/aes_pkg.sv b/SystemVerilog/aes_pkg.sv
new file mode 100644
index 0000000..3babb50
--- /dev/null
+++ b/SystemVerilog/aes_pkg.sv
@@ -0,0 +1,12 @@
+`ifndef AES_PKG_SV
+`define AES_PKG_SV
+package aes_pkg;
+    `include "aes_define.sv"
+
+    `include "aes_base.sv"
+    `include "aes_encrypt.sv"
+    `include "aes_decrypt.sv"
+
+    `include "aes.sv"
+endpackage
+`endif // AES_PKG_SV
\ No newline at end of file