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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace ConsoleApp1
{
public class SM4
{
public static int SM4_ENCRYPT = 1;
public static int SM4_DECRYPT = 0;
private long GET_ULONG_BE(byte[] b, int i)
{
long n = (long)(b[i] & 0xff) << 24 | (long)((b[i + 1] & 0xff) << 16) | (long)((b[i + 2] & 0xff) << 8)
| (long)(b[i + 3] & 0xff) & 0xffffffffL;
return n;
}
private void PUT_ULONG_BE(long n, byte[] b, int i)
{
b[i] = (byte)(int)(0xFF & n >> 24);
b[i + 1] = (byte)(int)(0xFF & n >> 16);
b[i + 2] = (byte)(int)(0xFF & n >> 8);
b[i + 3] = (byte)(int)(0xFF & n);
}
private long SHL(long x, int n)
{
return (x & 0xFFFFFFFF) << n;
}
private long ROTL(long x, int n)
{
return SHL(x, n) | x >> (32 - n);
}
private void SWAP(long[] sk, int i)
{
long t = sk[i];
sk[i] = sk[(31 - i)];
sk[(31 - i)] = t;
}
public static byte[] SboxTable = { (byte) 0xd6, (byte) 0x90, (byte) 0xe9, (byte) 0xfe, (byte) 0xcc,
(byte) 0xe1, 0x3d, (byte) 0xb7, 0x16, (byte) 0xb6, 0x14, (byte) 0xc2, 0x28, (byte) 0xfb, 0x2c, 0x05, 0x2b,
0x67, (byte) 0x9a, 0x76, 0x2a, (byte) 0xbe, 0x04, (byte) 0xc3, (byte) 0xaa, 0x44, 0x13, 0x26, 0x49,
(byte) 0x86, 0x06, (byte) 0x99, (byte) 0x9c, 0x42, 0x50, (byte) 0xf4, (byte) 0x91, (byte) 0xef, (byte) 0x98,
0x7a, 0x33, 0x54, 0x0b, 0x43, (byte) 0xed, (byte) 0xcf, (byte) 0xac, 0x62, (byte) 0xe4, (byte) 0xb3, 0x1c,
(byte) 0xa9, (byte) 0xc9, 0x08, (byte) 0xe8, (byte) 0x95, (byte) 0x80, (byte) 0xdf, (byte) 0x94,
(byte) 0xfa, 0x75, (byte) 0x8f, 0x3f, (byte) 0xa6, 0x47, 0x07, (byte) 0xa7, (byte) 0xfc, (byte) 0xf3, 0x73,
0x17, (byte) 0xba, (byte) 0x83, 0x59, 0x3c, 0x19, (byte) 0xe6, (byte) 0x85, 0x4f, (byte) 0xa8, 0x68, 0x6b,
(byte) 0x81, (byte) 0xb2, 0x71, 0x64, (byte) 0xda, (byte) 0x8b, (byte) 0xf8, (byte) 0xeb, 0x0f, 0x4b, 0x70,
0x56, (byte) 0x9d, 0x35, 0x1e, 0x24, 0x0e, 0x5e, 0x63, 0x58, (byte) 0xd1, (byte) 0xa2, 0x25, 0x22, 0x7c,
0x3b, 0x01, 0x21, 0x78, (byte) 0x87, (byte) 0xd4, 0x00, 0x46, 0x57, (byte) 0x9f, (byte) 0xd3, 0x27, 0x52,
0x4c, 0x36, 0x02, (byte) 0xe7, (byte) 0xa0, (byte) 0xc4, (byte) 0xc8, (byte) 0x9e, (byte) 0xea, (byte) 0xbf,
(byte) 0x8a, (byte) 0xd2, 0x40, (byte) 0xc7, 0x38, (byte) 0xb5, (byte) 0xa3, (byte) 0xf7, (byte) 0xf2,
(byte) 0xce, (byte) 0xf9, 0x61, 0x15, (byte) 0xa1, (byte) 0xe0, (byte) 0xae, 0x5d, (byte) 0xa4, (byte) 0x9b,
0x34, 0x1a, 0x55, (byte) 0xad, (byte) 0x93, 0x32, 0x30, (byte) 0xf5, (byte) 0x8c, (byte) 0xb1, (byte) 0xe3,
0x1d, (byte) 0xf6, (byte) 0xe2, 0x2e, (byte) 0x82, 0x66, (byte) 0xca, 0x60, (byte) 0xc0, 0x29, 0x23,
(byte) 0xab, 0x0d, 0x53, 0x4e, 0x6f, (byte) 0xd5, (byte) 0xdb, 0x37, 0x45, (byte) 0xde, (byte) 0xfd,
(byte) 0x8e, 0x2f, 0x03, (byte) 0xff, 0x6a, 0x72, 0x6d, 0x6c, 0x5b, 0x51, (byte) 0x8d, 0x1b, (byte) 0xaf,
(byte) 0x92, (byte) 0xbb, (byte) 0xdd, (byte) 0xbc, 0x7f, 0x11, (byte) 0xd9, 0x5c, 0x41, 0x1f, 0x10, 0x5a,
(byte) 0xd8, 0x0a, (byte) 0xc1, 0x31, (byte) 0x88, (byte) 0xa5, (byte) 0xcd, 0x7b, (byte) 0xbd, 0x2d, 0x74,
(byte) 0xd0, 0x12, (byte) 0xb8, (byte) 0xe5, (byte) 0xb4, (byte) 0xb0, (byte) 0x89, 0x69, (byte) 0x97, 0x4a,
0x0c, (byte) 0x96, 0x77, 0x7e, 0x65, (byte) 0xb9, (byte) 0xf1, 0x09, (byte) 0xc5, 0x6e, (byte) 0xc6,
(byte) 0x84, 0x18, (byte) 0xf0, 0x7d, (byte) 0xec, 0x3a, (byte) 0xdc, 0x4d, 0x20, 0x79, (byte) 0xee, 0x5f,
0x3e, (byte) 0xd7, (byte) 0xcb, 0x39, 0x48 };
public static int[] FK = { -1548633402, 0x56aa3350, 0x677d9197, -1301273892 };
public static int[] CK = { 462357, 472066609, 943670861, 1415275113, 1886879365, -1936483679,
-1464879427, -993275175, -521670923, -66909679, 404694573, 876298825, 1347903077, 1819507329,
-2003855715, -1532251463, -1060647211, -589042959, -117504499, 337322537, 808926789, 1280531041,
1752135293, -2071227751, -1599623499, -1128019247, -656414995, -184876535, 269950501, 741554753, 1213159005, 1684763257 };
private byte sm4Sbox(byte inch)
{
int i = inch & 0xFF;
byte retVal = SboxTable[i];
return retVal;
}
private long sm4Lt(long ka)
{
long bb = 0L;
long c = 0L;
byte[] a = new byte[4];
byte[] b = new byte[4];
PUT_ULONG_BE(ka, a, 0);
b[0] = sm4Sbox(a[0]);
b[1] = sm4Sbox(a[1]);
b[2] = sm4Sbox(a[2]);
b[3] = sm4Sbox(a[3]);
bb = GET_ULONG_BE(b, 0);
c = bb ^ ROTL(bb, 2) ^ ROTL(bb, 10) ^ ROTL(bb, 18) ^ ROTL(bb, 24);
return c;
}
private long sm4F(long x0, long x1, long x2, long x3, long rk)
{
return x0 ^ sm4Lt(x1 ^ x2 ^ x3 ^ rk);
}
private long sm4CalciRK(long ka)
{
long bb = 0L;
long rk = 0L;
byte[] a = new byte[4];
byte[] b = new byte[4];
PUT_ULONG_BE(ka, a, 0);
b[0] = sm4Sbox(a[0]);
b[1] = sm4Sbox(a[1]);
b[2] = sm4Sbox(a[2]);
b[3] = sm4Sbox(a[3]);
bb = GET_ULONG_BE(b, 0);
rk = bb ^ ROTL(bb, 13) ^ ROTL(bb, 23);
return rk;
}
private void sm4_setkey(long[] SK, byte[] key)
{
long[] MK = new long[4];
long[] k = new long[36];
int i = 0;
MK[0] = GET_ULONG_BE(key, 0);
MK[1] = GET_ULONG_BE(key, 4);
MK[2] = GET_ULONG_BE(key, 8);
MK[3] = GET_ULONG_BE(key, 12);
k[0] = MK[0] ^ (long)FK[0];
k[1] = MK[1] ^ (long)FK[1];
k[2] = MK[2] ^ (long)FK[2];
k[3] = MK[3] ^ (long)FK[3];
for (; i < 32; i++)
{
k[(i + 4)] = (k[i] ^ sm4CalciRK(k[(i + 1)] ^ k[(i + 2)] ^ k[(i + 3)] ^ (long)CK[i]));
SK[i] = k[(i + 4)];
}
}
private void sm4_one_round(long[] sk, byte[] input, byte[] output)
{
int i = 0;
long[] ulbuf = new long[36];
ulbuf[0] = GET_ULONG_BE(input, 0);
ulbuf[1] = GET_ULONG_BE(input, 4);
ulbuf[2] = GET_ULONG_BE(input, 8);
ulbuf[3] = GET_ULONG_BE(input, 12);
while (i < 32)
{
ulbuf[(i + 4)] = sm4F(ulbuf[i], ulbuf[(i + 1)], ulbuf[(i + 2)], ulbuf[(i + 3)], sk[i]);
i++;
}
PUT_ULONG_BE(ulbuf[35], output, 0);
PUT_ULONG_BE(ulbuf[34], output, 4);
PUT_ULONG_BE(ulbuf[33], output, 8);
PUT_ULONG_BE(ulbuf[32], output, 12);
}
private byte[] padding(byte[] input, int mode)
{
if (input == null)
{
return null;
}
byte[] ret = (byte[])null;
if (mode == SM4_ENCRYPT)
{
int p = 16 - input.Length % 16;
ret = new byte[input.Length + p];
Array.Copy(input, 0, ret, 0, input.Length);
for (int i = 0; i < p; i++)
{
ret[input.Length + i] = (byte)p;
}
}
else
{
int p = input[input.Length - 1];
ret = new byte[input.Length - p];
Array.Copy(input, 0, ret, 0, input.Length - p);
}
return ret;
}
public void sm4_setkey_enc(SM4_Context ctx, byte[] key)
{
if (ctx == null)
{
throw new Exception("ctx is null!");
}
/*if (key == null || key.length != 16) {
throw new Exception("key error!");
}*/
if (key == null || key.Length != 32)
{
throw new Exception("key error!");
}
ctx.mode = SM4_ENCRYPT;
sm4_setkey(ctx.sk, key);
}
public void sm4_setkey_dec(SM4_Context ctx, byte[] key)
{
if (ctx == null)
{
throw new Exception("ctx is null!");
}
/*if (key == null || key.length != 16) {
throw new Exception("key error!");
}*/
if (key == null || key.Length != 32)
{
throw new Exception("key error!");
}
int i = 0;
ctx.mode = SM4_DECRYPT;
sm4_setkey(ctx.sk, key);
for (i = 0; i < 16; i++)
{
SWAP(ctx.sk, i);
}
}
public byte[] sm4_crypt_ecb(SM4_Context ctx, byte[] input)
{
if (input == null)
{
throw new Exception("input is null!");
}
if ((ctx.isPadding) && (ctx.mode == SM4_ENCRYPT))
{
input = padding(input, SM4_ENCRYPT);
}
int length = input.Length;
MemoryStream bins = new MemoryStream(input);
MemoryStream bous = new MemoryStream();
for (; length > 0; length -= 16)
{
byte[] inByte = new byte[16];
byte[] outByte = new byte[16];
bins.Read(inByte, 0, inByte.Length);
sm4_one_round(ctx.sk, inByte, outByte);
bous.Write(outByte, 0, outByte.Length);
}
byte[] output = bous.ToArray();
if (ctx.isPadding && ctx.mode == SM4_DECRYPT)
{
output = padding(output, SM4_DECRYPT);
}
bins.Dispose();
bous.Dispose();
return output;
}
public byte[] sm4_crypt_cbc(SM4_Context ctx, byte[] iv, byte[] input)
{
if (iv == null || iv.Length != 16)
{
throw new Exception("iv error!");
}
if (input == null)
{
throw new Exception("input is null!");
}
if (ctx.isPadding && ctx.mode == SM4_ENCRYPT)
{
input = padding(input, SM4_ENCRYPT);
}
int i = 0;
int length = input.Length;
MemoryStream bins = new MemoryStream(input);
MemoryStream bous = new MemoryStream();
if (ctx.mode == SM4_ENCRYPT)
{
for (; length > 0; length -= 16)
{
byte[] inByte = new byte[16];
byte[] outByte = new byte[16];
byte[] out1 = new byte[16];
bins.Read(inByte, 0, inByte.Length);
for (i = 0; i < 16; i++)
{
outByte[i] = ((byte)(inByte[i] ^ iv[i]));
}
sm4_one_round(ctx.sk, outByte, out1);
Array.Copy(out1, 0, iv, 0, 16);
bous.Write(out1, 0, out1.Length);
}
}
else
{
byte[] temp = new byte[16];
for (; length > 0; length -= 16)
{
byte[] inByte = new byte[16];
byte[] outByte = new byte[16];
byte[] out1 = new byte[16];
bins.Read(inByte, 0, inByte.Length);
Array.Copy(inByte, 0, temp, 0, 16);
sm4_one_round(ctx.sk, inByte, outByte);
for (i = 0; i < 16; i++)
{
out1[i] = ((byte)(outByte[i] ^ iv[i]));
}
Array.Copy(temp, 0, iv, 0, 16);
bous.Write(out1,0,out1.Length);
}
}
byte[] output = bous.ToArray();
if (ctx.isPadding && ctx.mode == SM4_DECRYPT)
{
output = padding(output, SM4_DECRYPT);
}
bins.Dispose();
bous.Dispose();
return output;
}
}
}
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