Maven依赖
<dependency>
<groupId>org.bouncycastle</groupId>
<artifactId>bcprov-jdk15on</artifactId>
<version>1.56</version>
</dependency>
SM4
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
public class SM4 {
protected static final int SM4_ENCRYPT = 1;
protected static final int SM4_DECRYPT = 0;
protected static final byte[] SboxTable = new byte[]{-42, -112, -23, -2, -52, -31, 61, -73, 22, -74, 20, -62, 40, -5, 44, 5, 43, 103, -102, 118, 42, -66, 4, -61, -86, 68, 19, 38, 73, -122, 6, -103, -100, 66, 80, -12, -111, -17, -104, 122, 51, 84, 11, 67, -19, -49, -84, 98, -28, -77, 28, -87, -55, 8, -24, -107, -128, -33, -108, -6, 117, -113, 63, -90, 71, 7, -89, -4, -13, 115, 23, -70, -125, 89, 60, 25, -26, -123, 79, -88, 104, 107, -127, -78, 113, 100, -38, -117, -8, -21, 15, 75, 112, 86, -99, 53, 30, 36, 14, 94, 99, 88, -47, -94, 37, 34, 124, 59, 1, 33, 120, -121, -44, 0, 70, 87, -97, -45, 39, 82, 76, 54, 2, -25, -96, -60, -56, -98, -22, -65, -118, -46, 64, -57, 56, -75, -93, -9, -14, -50, -7, 97, 21, -95, -32, -82, 93, -92, -101, 52, 26, 85, -83, -109, 50, 48, -11, -116, -79, -29, 29, -10, -30, 46, -126, 102, -54, 96, -64, 41, 35, -85, 13, 83, 78, 111, -43, -37, 55, 69, -34, -3, -114, 47, 3, -1, 106, 114, 109, 108, 91, 81, -115, 27, -81, -110, -69, -35, -68, 127, 17, -39, 92, 65, 31, 16, 90, -40, 10, -63, 49, -120, -91, -51, 123, -67, 45, 116, -48, 18, -72, -27, -76, -80, -119, 105, -105, 74, 12, -106, 119, 126, 101, -71, -15, 9, -59, 110, -58, -124, 24, -16, 125, -20, 58, -36, 77, 32, 121, -18, 95, 62, -41, -53, 57, 72};
protected static final int[] FK = new int[]{-1548633402, 1453994832, 1736282519, -1301273892};
protected static final int[] CK = new int[]{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};
public SM4() {
}
private long GET_ULONG_BE(byte[] b, int i) {
long n = (long)(b[i] & 255) << 24 | (long)((b[i + 1] & 255) << 16) | (long)((b[i + 2] & 255) << 8) | (long)(b[i + 3] & 255) & 4294967295L;
return n;
}
private void PUT_ULONG_BE(long n, byte[] b, int i) {
b[i] = (byte)((int)(255L & n >> 24));
b[i + 1] = (byte)((int)(255L & n >> 16));
b[i + 2] = (byte)((int)(255L & n >> 8));
b[i + 3] = (byte)((int)(255L & n));
}
private long SHL(long x, int n) {
return (x & -1L) << n;
}
private long ROTL(long x, int n) {
return this.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;
}
private byte sm4Sbox(byte inch) {
int i = inch & 255;
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];
this.PUT_ULONG_BE(ka, a, 0);
b[0] = this.sm4Sbox(a[0]);
b[1] = this.sm4Sbox(a[1]);
b[2] = this.sm4Sbox(a[2]);
b[3] = this.sm4Sbox(a[3]);
bb = this.GET_ULONG_BE(b, 0);
c = bb ^ this.ROTL(bb, 2) ^ this.ROTL(bb, 10) ^ this.ROTL(bb, 18) ^ this.ROTL(bb, 24);
return c;
}
private long sm4F(long x0, long x1, long x2, long x3, long rk) {
return x0 ^ this.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];
this.PUT_ULONG_BE(ka, a, 0);
b[0] = this.sm4Sbox(a[0]);
b[1] = this.sm4Sbox(a[1]);
b[2] = this.sm4Sbox(a[2]);
b[3] = this.sm4Sbox(a[3]);
bb = this.GET_ULONG_BE(b, 0);
rk = bb ^ this.ROTL(bb, 13) ^ this.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] = this.GET_ULONG_BE(key, 0);
MK[1] = this.GET_ULONG_BE(key, 4);
MK[2] = this.GET_ULONG_BE(key, 8);
MK[3] = this.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];
for(k[3] = MK[3] ^ (long)FK[3]; i < 32; ++i) {
k[i + 4] = k[i] ^ this.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] = this.GET_ULONG_BE(input, 0);
ulbuf[1] = this.GET_ULONG_BE(input, 4);
ulbuf[2] = this.GET_ULONG_BE(input, 8);
for(ulbuf[3] = this.GET_ULONG_BE(input, 12); i < 32; ++i) {
ulbuf[i + 4] = this.sm4F(ulbuf[i], ulbuf[i + 1], ulbuf[i + 2], ulbuf[i + 3], sk[i]);
}
this.PUT_ULONG_BE(ulbuf[35], output, 0);
this.PUT_ULONG_BE(ulbuf[34], output, 4);
this.PUT_ULONG_BE(ulbuf[33], output, 8);
this.PUT_ULONG_BE(ulbuf[32], output, 12);
}
private byte[] padding(byte[] input, int mode) {
if (input == null) {
return null;
} else if (input.length % 16 == 0) {
return input;
} else {
byte[] ret = (byte[])null;
if (mode == 1) {
int p = 16 - input.length % 16;
ret = new byte[input.length + p];
System.arraycopy(input, 0, ret, 0, input.length);
for(int i = 0; i < p; ++i) {
ret[input.length + i] = 0;
}
} else {
int p = input[input.length - 1];
ret = new byte[input.length - p];
System.arraycopy(input, 0, ret, 0, input.length - p);
}
return ret;
}
}
protected void sm4_setkey_enc(SM4_Context ctx, byte[] key) throws Exception {
if (ctx == null) {
throw new Exception("ctx is null!");
} else if (key != null && key.length == 16) {
ctx.mode = 1;
this.sm4_setkey(ctx.sk, key);
} else {
throw new Exception("key error!");
}
}
protected void sm4_setkey_dec(SM4_Context ctx, byte[] key) throws Exception {
if (ctx == null) {
throw new Exception("ctx is null!");
} else if (key != null && key.length == 16) {
ctx.mode = 0;
this.sm4_setkey(ctx.sk, key);
for(int i = 0; i < 16; ++i) {
this.SWAP(ctx.sk, i);
}
} else {
throw new Exception("key error!");
}
}
protected byte[] sm4_crypt_ecb(SM4_Context ctx, byte[] input) throws Exception {
if (input == null) {
throw new Exception("input is null!");
} else {
if (ctx.isPadding && ctx.mode == 1) {
input = this.padding(input, 1);
}
int length = input.length;
ByteArrayInputStream bins = new ByteArrayInputStream(input);
ByteArrayOutputStream bous;
byte[] output;
for(bous = new ByteArrayOutputStream(); length > 0; length -= 16) {
output = new byte[16];
byte[] out = new byte[16];
bins.read(output);
this.sm4_one_round(ctx.sk, output, out);
bous.write(out);
}
output = bous.toByteArray();
if (ctx.isPadding && ctx.mode == 0) {
output = this.padding(output, 0);
}
bins.close();
bous.close();
return output;
}
}
protected byte[] sm4_crypt_cbc(SM4_Context ctx, byte[] iv, byte[] input) throws Exception {
if (iv != null && iv.length == 16) {
if (input == null) {
throw new Exception("input is null!");
} else {
if (ctx.isPadding && ctx.mode == 1) {
input = this.padding(input, 1);
}
int length = input.length;
ByteArrayInputStream bins = new ByteArrayInputStream(input);
ByteArrayOutputStream bous = new ByteArrayOutputStream();
byte[] temp;
byte[] out;
int i;
if (ctx.mode != 1) {
for(temp = new byte[16]; length > 0; length -= 16) {
out = new byte[16];
out = new byte[16];
byte[] out1 = new byte[16];
bins.read(out);
System.arraycopy(out, 0, temp, 0, 16);
this.sm4_one_round(ctx.sk, out, out);
for(i = 0; i < 16; ++i) {
out1[i] = (byte)(out[i] ^ iv[i]);
}
System.arraycopy(temp, 0, iv, 0, 16);
bous.write(out1);
}
} else {
while(length > 0) {
temp = new byte[16];
out = new byte[16];
out = new byte[16];
bins.read(temp);
for(i = 0; i < 16; ++i) {
out[i] = (byte)(temp[i] ^ iv[i]);
}
this.sm4_one_round(ctx.sk, out, out);
System.arraycopy(out, 0, iv, 0, 16);
bous.write(out);
length -= 16;
}
}
temp = bous.toByteArray();
if (ctx.isPadding) {
int var10000 = ctx.mode;
}
bins.close();
bous.close();
return temp;
}
} else {
throw new Exception("iv error!");
}
}
}
SM4_Context
public class SM4_Context {
public int mode = 1;
public long[] sk = new long[32];
public boolean isPadding = true;
protected SM4_Context() {
}
/**
* 加密
* @param plainText 参数
* @param keyBytes 随机码
* @return
*/
public byte[] EncryptByte(byte[] plainText,byte[] keyBytes) {
if (keyBytes != null && keyBytes.length == 16) {
if (plainText != null && plainText.length > 0) {
try {
SM4_Context ctx = new SM4_Context();
ctx.isPadding = true;
ctx.mode = 1;
SM4 sm4 = new SM4();
sm4.sm4_setkey_enc(ctx, keyBytes);
byte[] encrypted = sm4.sm4_crypt_ecb(ctx, plainText);
return encrypted;
} catch (Exception var6) {
var6.printStackTrace();
return null;
}
} else {
return null;
}
} else {
return null;
}
}
/**
* 解密
* @param cipherText 密文
* @param keyBytes 随机码
* @return
*/
public byte[] DecryptStrByte(byte[] cipherText,byte[] keyBytes) {
if (keyBytes != null && keyBytes.length == 16) {
if (cipherText != null && cipherText.length > 0 && cipherText.length % 16 == 0) {
try {
SM4_Context ctx = new SM4_Context();
ctx.isPadding = true;
ctx.mode = 0;
SM4 sm4 = new SM4();
sm4.sm4_setkey_dec(ctx, keyBytes);
byte[] decrypted = sm4.sm4_crypt_ecb(ctx, cipherText);
int decryptedLen = decrypted.length;
for (int i = decrypted.length - 1; i >= 0 && decrypted[i] == 0; --decryptedLen) {
--i;
}
byte[] temp = new byte[decryptedLen];
System.arraycopy(decrypted, 0, temp, 0, decryptedLen);
return temp;
} catch (Exception var8) {
var8.printStackTrace();
return null;
}
} else {
return null;
}
} else {
return null;
}
}
protected byte[] encryptData_CBC(byte[] ivBytes, byte[] keyBytes, byte[] plainText) {
if (keyBytes != null && keyBytes.length != 0 && keyBytes.length % 16 == 0) {
if (plainText != null && plainText.length > 0) {
if (ivBytes != null && ivBytes.length > 0) {
try {
SM4_Context ctx = new SM4_Context();
ctx.isPadding = true;
ctx.mode = 1;
SM4 sm4 = new SM4();
sm4.sm4_setkey_enc(ctx, keyBytes);
byte[] encrypted = sm4.sm4_crypt_cbc(ctx, ivBytes, plainText);
return encrypted;
} catch (Exception var7) {
var7.printStackTrace();
return null;
}
} else {
return null;
}
} else {
return null;
}
} else {
return null;
}
}
protected byte[] decryptData_CBC(byte[] ivBytes, byte[] keyBytes, byte[] cipherText) {
if (keyBytes != null && keyBytes.length != 0 && keyBytes.length % 16 == 0) {
if (cipherText != null && cipherText.length > 0) {
if (ivBytes != null && ivBytes.length > 0) {
try {
SM4_Context ctx = new SM4_Context();
ctx.isPadding = true;
ctx.mode = 0;
SM4 sm4 = new SM4();
sm4.sm4_setkey_dec(ctx, keyBytes);
byte[] decrypted = sm4.sm4_crypt_cbc(ctx, ivBytes, cipherText);
return decrypted;
} catch (Exception var7) {
var7.printStackTrace();
return null;
}
} else {
return null;
}
} else {
return null;
}
} else {
return null;
}
}
}
SM4Utils
import org.bouncycastle.util.encoders.Hex;
import javax.xml.bind.DatatypeConverter;
public class SM4Utils {
/**
* SM4加密
* @param str 参数
* @param key 随机码
* @return
*/
public static String EncryptStr(String str,String key) {
return DatatypeConverter.printHexBinary(new SM4_Context().EncryptByte(str.getBytes(),key.getBytes()));
}
/**
* 解密
* @param cipherStrings 密文
* @param keyStr 随机码
* @return
*/
public static String DecryptStr(String cipherStrings,String keyStr) {
String result = "";
SM4_Context aa=new SM4_Context();
byte[] cc="00".getBytes();
byte[] dd="00".getBytes();
byte[] cipherText = Hex.decode(cipherStrings);
byte[] keyBytes = keyStr.getBytes();
try {
dd= aa.DecryptStrByte(cipherText,keyBytes);
result = new String(dd);
} catch (Exception e) {
}
return result;
}
public static void main(String[] args) {
//参数
String str = "{\"test\":\"001\"}";
System.out.println("参数:" + str);
//key必须是16位
String key ="LSxH5p1vs3ePYJfM";
String ncECBData = EncryptStr(str, key);
System.out.println("加密:"+ncECBData);
String plainTextEncripted = DecryptStr(ncECBData,key);
System.out.println("解密:"+plainTextEncripted);
}
}
转载：https://blog.csdn.net/yao583224426/article/details/121746919
标签：java,SM4,ctx,long,length,国密,new,byte,null From： https://www.cnblogs.com/fuanyu/p/18182248