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input kload; // load cipher key
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input kload; // load cipher key
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input [255:0] key; // cipher key input
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input [255:0] key; // cipher key input
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input [63:0] pdata; // plain text input
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input [63:0] pdata; // plain text input
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output [63:0] cdata; // cipher text output
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output [63:0] cdata; // cipher text output
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`ifdef GOST_R_3411_TESTPARAM
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`include "gost-sbox.vh"
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// Using the GOST R 34.11-94 TestParameter S-boxes
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const logic [3:0] S1 [0:15] = { 4, 10, 9, 2, 13, 8, 0, 14, 6, 11, 1, 12, 7, 15, 5, 3};
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const logic [3:0] S2 [0:15] = { 14, 11, 4, 12, 6, 13, 15, 10, 2, 3, 8, 1, 0, 7, 5, 9};
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const logic [3:0] S3 [0:15] = { 5, 8, 1, 13, 10, 3, 4, 2, 14, 15, 12, 7, 6, 0, 9, 11};
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const logic [3:0] S4 [0:15] = { 7, 13, 10, 1, 0, 8, 9, 15, 14, 4, 6, 12, 11, 2, 5, 3};
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const logic [3:0] S5 [0:15] = { 6, 12, 7, 1, 5, 15, 13, 8, 4, 10, 9, 14, 0, 3, 11, 2};
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const logic [3:0] S6 [0:15] = { 4, 11, 10, 0, 7, 2, 1, 13, 3, 6, 8, 5, 9, 12, 15, 14};
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const logic [3:0] S7 [0:15] = { 13, 11, 4, 1, 3, 15, 5, 9, 0, 10, 14, 7, 6, 8, 2, 12};
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const logic [3:0] S8 [0:15] = { 1, 15, 13, 0, 5, 7, 10, 4, 9, 2, 3, 14, 6, 11, 8, 12};
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`endif
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`ifdef GOST_R_3411_CRYPTOPRO
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// Using the CryptoPro S-boxes
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const logic [3:0] S1 [0:15] = { 10, 4, 5, 6, 8, 1, 3, 7, 13, 12, 14, 0, 9, 2, 11, 15};
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const logic [3:0] S2 [0:15] = { 5, 15, 4, 0, 2, 13, 11, 9, 1, 7, 6, 3, 12, 14, 10, 8};
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const logic [3:0] S3 [0:15] = { 7, 15, 12, 14, 9, 4, 1, 0, 3, 11, 5, 2, 6, 10, 8, 13};
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const logic [3:0] S4 [0:15] = { 4, 10, 7, 12, 0, 15, 2, 8, 14, 1, 6, 5, 13, 11, 9, 3};
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const logic [3:0] S5 [0:15] = { 7, 6, 4, 11, 9, 12, 2, 10, 1, 8, 0, 14, 15, 13, 3, 5};
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const logic [3:0] S6 [0:15] = { 7, 6, 2, 4, 13, 9, 15, 0, 10, 1, 5, 11, 8, 14, 12, 3};
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const logic [3:0] S7 [0:15] = { 13, 14, 4, 1, 7, 0, 5, 10, 3, 12, 8, 15, 6, 2, 9, 11};
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const logic [3:0] S8 [0:15] = { 1, 3, 10, 9, 5, 11, 4, 15, 8, 6, 7, 14, 13, 0, 2, 12};
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`endif
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`ifdef GOST_R_3411_BOTH
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// Using both parameter's Set S-Boxes: GOST R 34.11-94 TestParameter and CryptoPro
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// GOST R 34.11-94 TestParameter S-boxes
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const logic [3:0] S1_TESTPARAM [0:15] = { 4, 10, 9, 2, 13, 8, 0, 14, 6, 11, 1, 12, 7, 15, 5, 3};
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const logic [3:0] S2_TESTPARAM [0:15] = { 14, 11, 4, 12, 6, 13, 15, 10, 2, 3, 8, 1, 0, 7, 5, 9};
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const logic [3:0] S3_TESTPARAM [0:15] = { 5, 8, 1, 13, 10, 3, 4, 2, 14, 15, 12, 7, 6, 0, 9, 11};
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const logic [3:0] S4_TESTPARAM [0:15] = { 7, 13, 10, 1, 0, 8, 9, 15, 14, 4, 6, 12, 11, 2, 5, 3};
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const logic [3:0] S5_TESTPARAM [0:15] = { 6, 12, 7, 1, 5, 15, 13, 8, 4, 10, 9, 14, 0, 3, 11, 2};
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const logic [3:0] S6_TESTPARAM [0:15] = { 4, 11, 10, 0, 7, 2, 1, 13, 3, 6, 8, 5, 9, 12, 15, 14};
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const logic [3:0] S7_TESTPARAM [0:15] = { 13, 11, 4, 1, 3, 15, 5, 9, 0, 10, 14, 7, 6, 8, 2, 12};
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const logic [3:0] S8_TESTPARAM [0:15] = { 1, 15, 13, 0, 5, 7, 10, 4, 9, 2, 3, 14, 6, 11, 8, 12};
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// CryptoPro S-boxes
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const logic [3:0] S1_CRYPTOPRO [0:15] = { 10, 4, 5, 6, 8, 1, 3, 7, 13, 12, 14, 0, 9, 2, 11, 15};
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const logic [3:0] S2_CRYPTOPRO [0:15] = { 5, 15, 4, 0, 2, 13, 11, 9, 1, 7, 6, 3, 12, 14, 10, 8};
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const logic [3:0] S3_CRYPTOPRO [0:15] = { 7, 15, 12, 14, 9, 4, 1, 0, 3, 11, 5, 2, 6, 10, 8, 13};
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const logic [3:0] S4_CRYPTOPRO [0:15] = { 4, 10, 7, 12, 0, 15, 2, 8, 14, 1, 6, 5, 13, 11, 9, 3};
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const logic [3:0] S5_CRYPTOPRO [0:15] = { 7, 6, 4, 11, 9, 12, 2, 10, 1, 8, 0, 14, 15, 13, 3, 5};
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const logic [3:0] S6_CRYPTOPRO [0:15] = { 7, 6, 2, 4, 13, 9, 15, 0, 10, 1, 5, 11, 8, 14, 12, 3};
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const logic [3:0] S7_CRYPTOPRO [0:15] = { 13, 14, 4, 1, 7, 0, 5, 10, 3, 12, 8, 15, 6, 2, 9, 11};
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const logic [3:0] S8_CRYPTOPRO [0:15] = { 1, 3, 10, 9, 5, 11, 4, 15, 8, 6, 7, 14, 13, 0, 2, 12};
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// define Sbox() function
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`define Sbox(x,sel) ( sel ? {S8_CRYPTOPRO[x[31:28]],S7_CRYPTOPRO[x[27:24]],S6_CRYPTOPRO[x[23:20]],S5_CRYPTOPRO[x[19:16]], \
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S4_CRYPTOPRO[x[15:12]],S3_CRYPTOPRO[x[11:8]],S2_CRYPTOPRO[x[7:4]],S1_CRYPTOPRO[x[3:0]]} : \
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{S8_TESTPARAM[x[31:28]],S7_TESTPARAM[x[27:24]],S6_TESTPARAM[x[23:20]],S5_TESTPARAM[x[19:16]], \
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S4_TESTPARAM[x[15:12]],S3_TESTPARAM[x[11:8]],S2_TESTPARAM[x[7:4]],S1_TESTPARAM[x[3:0]]})
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`endif
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`ifndef GOST_R_3411_BOTH
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// define Sbox() function
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`define Sbox(x,sel) {S8[x[31:28]],S7[x[27:24]],S6[x[23:20]],S5[x[19:16]],S4[x[15:12]],S3[x[11:8]],S2[x[7:4]],S1[x[3:0]]}
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`endif
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reg [4:0] i; // cipher cycles counter: 0..31;
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reg [4:0] i; // cipher cycles counter: 0..31;
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always_ff @(posedge clk)
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always_ff @(posedge clk)
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if(rst || load)
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if(rst || load)
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