AES 加密算法，sv实现
本文摘抄自：https://blog.csdn.net/gulang03/article/details/81175854
代码是根据参考的博客中的算法自己手撸的。
1 typedef bit[3:0][7:0] Matrix[4]; 2 class aes_encrypt; 3 bit[15:0][7:0] SBLOCK[16] ='{'{8'h76, 4 local Matrix key; 5 local Matrix big_key[11]; 6 function new(); 7 key='{default:0}; 8 big_key='{default:0}; 9 endfunction 10 extern local function Matrix key_xor(input Matrix tkey,input Matrix data); 11 extern local function Matrix byte_transfer(input Matrix data); 12 extern local function Matrix row_shift(input Matrix data); 13 extern local function Matrix col_mix(Matrix data); 14 extern local function bit[7:0] field_multi(input bit[7:0] val,input bit[7:0] m); 15 extern local function bit[7:0] field_multi2(input bit[7:0] val); 16 extern local function void extend_key(); 17 extern local function bit[3:0][7:0] T(input bit[3:0][7:0] W, input bit[7:0] t); 18 extern local function Matrix get_ciphertext(input Matrix text); 19 //extern function bit[127:0] get_ciphertext_array(input bit[127:0] text); 20 extern function void get_key(bit[127:0] val); 21 //extern function void print(Matrix val,string str); 22 endclass 23 function Matrix aes_encrypt::byte_transfer(input Matrix data); 24 Matrix ret; 25 for(int i=0; i<4;i++) begin 26 for(int j=0;j<4;j++) begin 27 ret[i][j]=SBLOCK[data[i][j][7:4]][data[i][j][3:0]]; 28 end 29 end 30 return ret; 31 endfunction 32 33 function Matrix aes_encrypt::row_shift(input Matrix data); 34 Matrix ret; 35 ret[0]=data[0]; 36 ret[1]={data[1][0],data[1][3],data[1][2],data[1][1]}; 37 ret[2]={data[2][1],data[2][0],data[2][3],data[2][2]}; 38 ret[3]={data[3][2],data[3][1],data[3][0],data[3][3]}; 39 return ret; 40 endfunction 41 function Matrix aes_encrypt::col_mix(Matrix data); 42 Matrix ret; 43 Matrix const_array='{'{8'h01,8'h01,8'h03,8'h02}, 44 '{8'h01,8'h03,8'h02,8'h01}, 45 '{8'h03,8'h02,8'h01,8'h01), 46 '{8'h02,8'h01,8'h01,8'h03}}; 47 for(int i=0;i<4;i++)begin 48 for(int j=0;j<4;j++) begin 49 for(int m=0;m<4;m++) begin 50 ret[i][j]=ret[i][j]^field_multi(data[m][j],const_array[i][m]); 51 end 52 end 53 end 54 return ret; 55 enfunction 56 57 function bit[7:0] aes_encrypt::field_multi(input bit[7:0] val, input bit[7:0] m); 58 bit[7:0] result=8'h0; 59 result=m[0]?val:8'd0; 60 for(int i=1;i<8;i++) begin 61 if(m[i]==1) begin 62 for(int t=0;t<i;t++) begin 63 result=result^field_multi2(val); 64 end 65 end 66 end 67 return result; 68 endfunction 69 70 function bit[7:0] aes_encrypt::field_multi2(input bit[7:0] val); 71 return (val[7]!=1)?(val<<1):((val<<1)^8'h1b); 72 endfunction 73 74 function aes_encrypt::extend_key(); 75 bit[3:0][7:0] ww; 76 big_key[0]=key; 77 for(int m=1;m<11;m++) begin 78 for(int j=0;j<4;j++) begin 79 for(int i=0;i<4;i++) begin 80 if(j==0) begin 81 ww={big_key[m-1][0][3],big_key[m-1][1][3],big_key[m-1][2][3],big_key[m-1][3][3]}; 82 ww=T(ww,m); 83 big_key[m][i][j]=big_key[m-1][i][j]^ww[3-i]; 84 end else begin 85 big_key[m][i][j]=big_key[m-1][i][j]^big_key[m][i][j-1]; 86 end 87 end 88 end 89 end 90 endfunction 91 function bit[3:0][7:0] aes_encrypt::T(input bit[3:0][7:0] W, input bit[7:0] t); 92 bit[3:0][7:0] ret; 93 ret={W[2],W[1],W[0],W[3]}; 94 for(int i=0;i<4;i++) begin 95 ret[i]=SBLOCK[ret[i][7:4]][ret[i][3:0]]; 96 end 97 case(t) 98 8'd1: ret=ret^32'h01000000; 99 8'd2: ret=ret^32'h02000000; 100 8'd3: ret=ret^32'h04000000; 101 8'd4: ret=ret^32'h08000000; 102 8'd5: ret=ret^32'h10000000; 103 8'd6: ret=ret^32'h20000000; 104 8'd7: ret=ret^32'h40000000; 105 8'd8: ret=ret^32'h80000000; 106 8'd9: ret=ret^32'h1b000000; 107 8'd10: ret=ret^32'h36000000; 108 endcase 109 return ret; 110 endfunction 111 function Matrix aes_encrypt::get_ciphertext(input Matrix text); 112 Matrix ret; 113 extend_key(); 114 ret=key_xor(key,text); 115 for(int i=1;i<11;i++) begin 116 ret=byte_transfer(ret); 117 ret=row_shift(ret); 118 if(i!=10)begin 119 ret=col_mix(ret); 120 end 121 ret=key_xor(big_key[i],ret); 122 end 123 return ret; 124 endfunction 125 function aes_encrypt:;get_key(bit[127:0] val) 126 //这个只能根据需要自己写了 127 endfunction
