icu.xuyijie.sm4utils.util.SM4 Maven / Gradle / Ivy
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package icu.xuyijie.sm4utils.util;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* @author 徐一杰
* @date 2022/10/11
*/
class SM4 {
private static final Logger logger = Logger.getLogger(SM4.class.getPackage().getName());
public static final int SM4_ENCRYPT = 1;
public static final int SM4_DECRYPT = 0;
private int getUlongBe(byte[] b, int i) {
return (b[i] & 0xff) << 24 | ((b[i + 1] & 0xff) << 16) | ((b[i + 2] & 0xff) << 8)
| b[i + 3] & 0xff & 0xffffffff;
}
private void putUlongBe(int n, byte[] b, int i) {
b[i] = (byte) (0xFF & n >> 24);
b[i + 1] = (byte) (0xFF & n >> 16);
b[i + 2] = (byte) (0xFF & n >> 8);
b[i + 3] = (byte) (0xFF & n);
}
private int shl(int x, int n) {
return (x & 0xFFFFFFFF) << n;
}
private int rotl(int x, int n) {
return shl(x, n) | x >> (32 - n);
}
protected static final byte[] SBOX_TABLE = {(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};
protected static final int[] FK = {0xa3b1bac6, 0x56aa3350, 0x677d9197, 0xb27022dc};
protected static final int[] CK = {0x00070e15, 0x1c232a31, 0x383f464d, 0x545b6269, 0x70777e85, 0x8c939aa1, 0xa8afb6bd,
0xc4cbd2d9, 0xe0e7eef5, 0xfc030a11, 0x181f262d, 0x343b4249, 0x50575e65, 0x6c737a81, 0x888f969d, 0xa4abb2b9,
0xc0c7ced5, 0xdce3eaf1, 0xf8ff060d, 0x141b2229, 0x30373e45, 0x4c535a61, 0x686f767d, 0x848b9299, 0xa0a7aeb5,
0xbcc3cad1, 0xd8dfe6ed, 0xf4fb0209, 0x10171e25, 0x2c333a41, 0x484f565d, 0x646b7279};
private byte sm4Sbox(byte inch) {
int i = inch & 0xFF;
return SBOX_TABLE[i];
}
private int sm4Lt(int ka) {
int bb;
int c;
byte[] a = new byte[4];
byte[] b = new byte[4];
putUlongBe(ka, a, 0);
b[0] = sm4Sbox(a[0]);
b[1] = sm4Sbox(a[1]);
b[2] = sm4Sbox(a[2]);
b[3] = sm4Sbox(a[3]);
bb = getUlongBe(b, 0);
c = bb ^ rotl(bb, 2) ^ rotl(bb, 10) ^ rotl(bb, 18) ^ rotl(bb, 24);
return c;
}
private int sm4F(int x0, int x1, int x2, int x3, int rk) {
return x0 ^ sm4Lt(x1 ^ x2 ^ x3 ^ rk);
}
private int sm4CalciRk(int ka) {
int bb;
int rk;
byte[] a = new byte[4];
byte[] b = new byte[4];
putUlongBe(ka, a, 0);
b[0] = sm4Sbox(a[0]);
b[1] = sm4Sbox(a[1]);
b[2] = sm4Sbox(a[2]);
b[3] = sm4Sbox(a[3]);
bb = getUlongBe(b, 0);
rk = bb ^ rotl(bb, 13) ^ rotl(bb, 23);
return rk;
}
private void sm4SetKey(int[] sk, byte[] key) {
int[] mK = new int[4];
int[] k = new int[36];
int i = 0;
mK[0] = getUlongBe(key, 0);
mK[1] = getUlongBe(key, 4);
mK[2] = getUlongBe(key, 8);
mK[3] = getUlongBe(key, 12);
k[0] = mK[0] ^ FK[0];
k[1] = mK[1] ^ FK[1];
k[2] = mK[2] ^ FK[2];
k[3] = mK[3] ^ FK[3];
for (; i < 32; i++) {
k[(i + 4)] = (k[i] ^ sm4CalciRk(k[(i + 1)] ^ k[(i + 2)] ^ k[(i + 3)] ^ CK[i]));
sk[i] = k[(i + 4)];
}
}
private void sm4OneRound(int[] sk, byte[] input, byte[] output) {
int i = 0;
int[] ulbuf = new int[36];
ulbuf[0] = getUlongBe(input, 0);
ulbuf[1] = getUlongBe(input, 4);
ulbuf[2] = getUlongBe(input, 8);
ulbuf[3] = getUlongBe(input, 12);
while (i < 32) {
ulbuf[(i + 4)] = sm4F(ulbuf[i], ulbuf[(i + 1)], ulbuf[(i + 2)], ulbuf[(i + 3)], sk[i]);
i++;
}
putUlongBe(ulbuf[35], output, 0);
putUlongBe(ulbuf[34], output, 4);
putUlongBe(ulbuf[33], output, 8);
putUlongBe(ulbuf[32], output, 12);
}
private byte[] padding(byte[] input, int mode) {
byte[] ret;
if (mode == SM4_ENCRYPT) {
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] = (byte) p;
}
} else {
int p = input[input.length - 1];
ret = new byte[input.length - p];
System.arraycopy(input, 0, ret, 0, input.length - p);
}
return ret;
}
private void validateDecrypt(SM4Context ctx, byte[] key) throws NullPointerException {
if (ctx == null) {
logger.log(Level.WARNING, "ctx is null");
throw new NullPointerException("ctx is null!");
}
if (key == null || key.length != 16) {
logger.log(Level.WARNING, "secretKey必须为 16 位，可包含字母、数字、标点");
throw new NullPointerException("secretKey必须为 16 位，可包含字母、数字、标点");
}
}
private void validateEncrypt(String type, byte[] iv, byte[] input) throws IllegalArgumentException {
if (SM4Utils.CBC.equals(type) && (iv == null || iv.length != 16)) {
logger.log(Level.WARNING, "iv必须为 16 位，可包含字母、数字、标点");
throw new IllegalArgumentException("iv必须为 16 位，可包含字母、数字、标点");
}
if (input == null) {
logger.log(Level.WARNING, "要加解密的数据为null");
throw new IllegalArgumentException("要加解密的数据为null");
}
}
public void sm4SetKeyEnc(SM4Context ctx, byte[] key) {
validateDecrypt(ctx, key);
ctx.mode = SM4_ENCRYPT;
sm4SetKey(ctx.sk, key);
}
public byte[] sm4CryptEcb(SM4Context ctx, byte[] input) throws IOException {
validateEncrypt(SM4Utils.ECB, null, input);
if ((ctx.isPadding) && (ctx.mode == SM4_ENCRYPT)) {
input = padding(input, SM4_ENCRYPT);
}
int length = input.length;
ByteArrayInputStream bins = new ByteArrayInputStream(input);
ByteArrayOutputStream bous = new ByteArrayOutputStream();
for (; length > 0; length -= 16) {
byte[] in = new byte[16];
byte[] out = new byte[16];
bins.read(in);
sm4OneRound(ctx.sk, in, out);
bous.write(out);
}
byte[] output = bous.toByteArray();
if (ctx.isPadding && ctx.mode == SM4_DECRYPT) {
output = padding(output, SM4_DECRYPT);
}
bins.close();
bous.close();
return output;
}
public void sm4SetKeyDec(SM4Context ctx, byte[] key) {
validateDecrypt(ctx, key);
int i;
ctx.mode = SM4_DECRYPT;
sm4SetKey(ctx.sk, key);
for (i = 0; i < 16; i++) {
swap(ctx.sk, i);
}
}
private void swap(int[] sk, int i) {
int t = sk[i];
sk[i] = sk[(31 - i)];
sk[(31 - i)] = t;
}
public byte[] sm4CryptCbc(SM4Context ctx, byte[] iv, byte[] input) throws IOException {
validateEncrypt(SM4Utils.CBC, iv, input);
if (ctx.isPadding && ctx.mode == SM4_ENCRYPT) {
input = padding(input, SM4_ENCRYPT);
}
int i;
int length = input.length;
ByteArrayInputStream bins = new ByteArrayInputStream(input);
ByteArrayOutputStream bous = new ByteArrayOutputStream();
if (ctx.mode == SM4_ENCRYPT) {
for (; length > 0; length -= 16) {
byte[] in = new byte[16];
byte[] out = new byte[16];
byte[] out1 = new byte[16];
bins.read(in);
for (i = 0; i < 16; i++) {
out[i] = ((byte) (in[i] ^ iv[i]));
}
sm4OneRound(ctx.sk, out, out1);
System.arraycopy(out1, 0, iv, 0, 16);
bous.write(out1);
}
} else {
byte[] temp = new byte[16];
for (; length > 0; length -= 16) {
byte[] in = new byte[16];
byte[] out = new byte[16];
byte[] out1 = new byte[16];
bins.read(in);
System.arraycopy(in, 0, temp, 0, 16);
sm4OneRound(ctx.sk, in, out);
for (i = 0; i < 16; i++) {
out1[i] = ((byte) (out[i] ^ iv[i]));
}
System.arraycopy(temp, 0, iv, 0, 16);
bous.write(out1);
}
}
byte[] output = bous.toByteArray();
if (ctx.isPadding && ctx.mode == SM4_DECRYPT) {
output = padding(output, SM4_DECRYPT);
}
bins.close();
bous.close();
return output;
}
}
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