SM4加密 & 解密

加密

org.bouncycastle.jce.provider.BouncyCastleProvider;
org.bouncycastle.pqc.math.linearalgebra.ByteUtils;
javax.crypto.Cipher;
javax.crypto.spec.SecretKeySpec;
java.security.Key;
java.security.Security;
/*入参：
str:
EPIDEMIC_KEY
 
*/
String ENCODING = "UTF-8";
String ALGORITHM_NAME = "SM4";
String ALGORITHM_NAME_ECB_PADDING = "SM4/ECB/PKCS5Padding";
Security.addProvider(new BouncyCastleProvider());
try {
    if (str != null && !"".equals(str)) {
        String cipherText = "";
        // 16进制字符串-->byte[]
        byte[] keyData = ByteUtils.fromHexString(EPIDEMIC_KEY);
        // String-->byte[]
        byte[] srcData = str.getBytes(ENCODING);
        // 加密后的数组
        Cipher cipher = Cipher.getInstance(ALGORITHM_NAME_ECB_PADDING, BouncyCastleProvider.PROVIDER_NAME);
        Key sm4Key = new SecretKeySpec(keyData, ALGORITHM_NAME);
        cipher.init(Cipher.ENCRYPT_MODE, sm4Key);
        byte[] cipherArray = cipher.doFinal(srcData);
        // byte[]-->hexString
        cipherText = ByteUtils.toHexString(cipherArray);
        System.out.println("cipherText:" + cipherText);
        return cipherText;
    } else {
        return str;
    }
} catch (Exception e) {
    return str;
}

解密

import sun.misc.BASE64Decoder;
 
public static void main(String[] args) {
        String cipherText=""; 
        String secretKey="";
        try {
            SM4Context ctx = new SM4Context();
            ctx.isPadding = true;
            ctx.mode = 0;
            byte[] keyBytes = secretKey.getBytes();
            SM4 sm4 = new SM4();
            sm4.sm4_setkey_dec(ctx, keyBytes);
            byte[] decrypted = sm4.sm4_crypt_ecb(ctx, (new BASE64Decoder()).decodeBuffer(cipherText));
            return new String(decrypted, StandardCharsets.UTF_8);
        } catch (Exception var6) {
            return null;
        }
    }

SM4Context.class

​
public class SM4Context {
    public int mode = 1;
 
    public long[] sk = new long[32];
 
    public boolean isPadding = true;
 
    public SM4Context() {}
}
 
​

sm4.class

​
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
 
public class SM4 {
    public static final int SM4_ENCRYPT = 1;
 
    public static final 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) << 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 final 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 final int[] FK = { 0xa3b1bac6, 0x56aa3350, 0x677d9197, 0xb27022dc };
 
    public 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;
        byte retVal = SboxTable[i];
        return retVal;
    }
 
    private long sm4Lt(long ka) {
        long bb;
        long c;
        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];
            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;
    }
 
    public void sm4_setkey_enc(SM4Context ctx, byte[] key) throws Exception {
        if (ctx == null) {
            throw new Exception("ctx is null!");
        }
 
        if (key == null || key.length != 16) {
            throw new Exception("key error!");
        }
 
        ctx.mode = SM4_ENCRYPT;
        sm4_setkey(ctx.sk, key);
    }
 
    public void sm4_setkey_dec(SM4Context ctx, byte[] key) throws Exception {
        if (ctx == null) {
            throw new Exception("ctx is null!");
        }
 
        if (key == null || key.length != 16) {
            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(SM4Context ctx, byte[] input) throws Exception {
        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;
        ByteArrayInputStream bins = new ByteArrayInputStream(input);
        ByteArrayOutputStream bous = new ByteArrayOutputStream();
        for (; length > 0; length -= 16) {
            byte[] in = new byte[16];
            byte[] out = new byte[16];
            int read = bins.read(in);
            sm4_one_round(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 byte[] sm4_crypt_cbc(SM4Context ctx, byte[] iv, byte[] input) throws Exception {
        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;
        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];
 
                int read = bins.read(in);
                for (i = 0; i < 16; i++) {
                    out[i] = ((byte) (in[i] ^ iv[i]));
                }
                sm4_one_round(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];
 
                int read = bins.read(in);
                System.arraycopy(in, 0, temp, 0, 16);
                sm4_one_round(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;
    }
}
 
​