sm4 前后端 加密_sm4加密[通俗易懂]

前言

项目里需要用到sm4加密，在这里记录一下(springboot)。

依赖

bouncycastle

org.bouncycastle

bcmail-jdk15on

1.66

cn.hutool

hutool-all

5.4.1

代码

直接贴代码，可以根据自己的需要封装相对应的代码逻辑。

//需要注意的是，使用KeyGenerator生成密钥种子的时候，windows和linux上会产生不一致。

//例如：

KeyGenerator kg = KeyGenerator.getInstance(ALGORITHM_NAME, PROVIDER_NAME);

SecureRandom random = new SecureRandom();

if(null != seed && !””.equals(seed)){

random.setSeed(seed.getBytes());

}

kg.init(keySize, random);

//解决办法

SecureRandom random = SecureRandom.getInstance(“SHA1PRNG”);

import cn.hutool.core.util.HexUtil;

import com.spinfo.common.constants.UserConstants;

import com.spinfo.controller.UserController;

import org.bouncycastle.jce.provider.BouncyCastleProvider;

import org.bouncycastle.util.encoders.Base64;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.springframework.util.DigestUtils;

import javax.crypto.*;

import javax.crypto.spec.IvParameterSpec;

import javax.crypto.spec.SecretKeySpec;

import java.security.*;

import java.util.Arrays;

public class SM4Util {

private static Logger logger = LoggerFactory.getLogger(SM4Util.class);

private static final String PROVIDER_NAME = “BC”;

public static final String ALGORITHM_NAME = “SM4”;

public static final String ALGORITHM_NAME_ECB_PADDING = “SM4/ECB/PKCS5Padding”;

public static final String ALGORITHM_NAME_CBC_PADDING = “SM4/CBC/PKCS5Padding”;

public static final String DEFAULT_KEY = “random_seed”;

public static final int DEFAULT_KEY_SIZE = 128;

private static final int ENCRYPT_MODE = 1;

private static final int DECRYPT_MODE = 2;

static {

Security.addProvider(new BouncyCastleProvider());

}

public static byte[] generateKey() throws NoSuchAlgorithmException, NoSuchProviderException {

return generateKey(DEFAULT_KEY, DEFAULT_KEY_SIZE);

}

public static byte[] generateKey(String seed) throws NoSuchAlgorithmException, NoSuchProviderException {

return generateKey(seed, DEFAULT_KEY_SIZE);

}

public static byte[] generateKey(String seed, int keySize) throws NoSuchAlgorithmException, NoSuchProviderException {

KeyGenerator kg = KeyGenerator.getInstance(ALGORITHM_NAME, PROVIDER_NAME);

SecureRandom random = SecureRandom.getInstance(“SHA1PRNG”);

if(null != seed && !””.equals(seed)){

random.setSeed(seed.getBytes());

}

kg.init(keySize, random);

return kg.generateKey().getEncoded();

}

/**

* ecb 加密

* @param key

* @param data

*/

public static byte[] encryptEcbPadding(byte[] key, byte[] data) throws InvalidKeyException, NoSuchAlgorithmException, NoSuchProviderException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException {

Cipher cipher = generateEcbCipher(ENCRYPT_MODE, key);

return cipher.doFinal(data);

}

/**

* ecb 解密

* @param key

* @param cipherText

*/

public static byte[] decryptEcbPadding(byte[] key, byte[] cipherText) throws IllegalBlockSizeException, BadPaddingException, InvalidKeyException, NoSuchAlgorithmException, NoSuchProviderException, NoSuchPaddingException {

Cipher cipher = generateEcbCipher(DECRYPT_MODE, key);

return cipher.doFinal(cipherText);

}

/**

* cbc 加密

* @param key

* @param data

*/

public static byte[] encryptCbcPadding(byte[] key, byte[] iv, byte[] data) throws InvalidKeyException, NoSuchAlgorithmException, NoSuchProviderException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException, InvalidAlgorithmParameterException {

Cipher cipher = generateCbcCipher(ENCRYPT_MODE, key, iv);

return cipher.doFinal(data);

}

public static String encryptCbcPaddingString(byte[] key, byte[] iv, byte[] data) throws InvalidKeyException, NoSuchAlgorithmException, NoSuchProviderException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException, InvalidAlgorithmParameterException {

Cipher cipher = generateCbcCipher(ENCRYPT_MODE, key, iv);

byte[] result = cipher.doFinal(data);

return Base64.toBase64String(result);

}

/**

* cbc 解密

* @param key

* @param iv

* @param cipherText

*/

public static byte[] decryptCbcPadding(byte[] key, byte[] iv, String cipherText) throws IllegalBlockSizeException, BadPaddingException, InvalidKeyException, NoSuchAlgorithmException, NoSuchProviderException, NoSuchPaddingException, InvalidAlgorithmParameterException {

byte[] cipherBytes = Base64.decode(cipherText);

Cipher cipher = generateCbcCipher(DECRYPT_MODE, key, iv);

return cipher.doFinal(cipherBytes);

}

public static byte[] decryptCbcPadding(byte[] key, byte[] iv, byte[] cipherText) throws IllegalBlockSizeException, BadPaddingException, InvalidKeyException, NoSuchAlgorithmException, NoSuchProviderException, NoSuchPaddingException, InvalidAlgorithmParameterException {

Cipher cipher = generateCbcCipher(DECRYPT_MODE, key, iv);

return cipher.doFinal(cipherText);

}

/**

* ecb cipher

* @param mode

* @param key

* @return

*/

private static Cipher generateEcbCipher(int mode, byte[] key) throws NoSuchAlgorithmException, NoSuchProviderException, NoSuchPaddingException, InvalidKeyException {

Cipher cipher = Cipher.getInstance(ALGORITHM_NAME_ECB_PADDING, PROVIDER_NAME);

Key sm4Key = new SecretKeySpec(key, ALGORITHM_NAME);

cipher.init(mode, sm4Key);

return cipher;

}

/**

* cbc cipher

* @param mode

* @param key

* @return

*/

private static Cipher generateCbcCipher(int mode, byte[] key, byte[] iv) throws InvalidKeyException, InvalidAlgorithmParameterException, NoSuchAlgorithmException, NoSuchProviderException, NoSuchPaddingException {

Cipher cipher = Cipher.getInstance(ALGORITHM_NAME_CBC_PADDING, PROVIDER_NAME);

Key sm4Key = new SecretKeySpec(key, ALGORITHM_NAME);

IvParameterSpec ivParameterSpec = new IvParameterSpec(iv);

cipher.init(mode, sm4Key, ivParameterSpec);

return cipher;

}

/**

* ecb 加密 times 次

* @param data

* @param salt

* @param times

* @return=

*/

public static String encryptEcbDataTimes(String data, String salt, int times) throws GeneralSecurityException {

try {

byte[] key = HexUtil.decodeHex(salt);

byte[] bytes = data.getBytes();

for(int i = 0; i < times; ++i) {

bytes = encryptEcbPadding(key, bytes);

}

data = Base64.toBase64String(bytes);

return data;

} catch (BadPaddingException | IllegalBlockSizeException | NoSuchPaddingException | NoSuchProviderException | NoSuchAlgorithmException | InvalidKeyException var5) {

throw new GeneralSecurityException(“SM4加密失败”);

}

}

/**

* ecb 解密 times 次

* @param data

* @param salt

* @param times

* @return

* @throws GeneralSecurityException

*/

public static String decryptEcbDataTimes(String data, String salt, int times) throws GeneralSecurityException {

try {

byte[] bytes = Base64.decode(data);

byte[] key = HexUtil.decodeHex(salt);

for(int i = 0; i < times; ++i) {

bytes = decryptEcbPadding(key, bytes);

}

data = new String(bytes);

return data;

} catch (BadPaddingException | IllegalBlockSizeException | NoSuchPaddingException | NoSuchProviderException | NoSuchAlgorithmException | InvalidKeyException var5) {

throw new GeneralSecurityException(“SM4解密失败”);

}

}

/**

* cbc 加密 times 次

* @param data

* @param salt

* @param times

* @return=

*/

public static String encryptCbcDataTimes(String data, String salt, int times) {

try {

byte[] iv = generateKey();

byte[] key = generateKey(salt);

byte[] bytes = data.getBytes();

Cipher cipher = generateCbcCipher(ENCRYPT_MODE, key, iv);

for(int i = 0; i < times; ++i) {

bytes = cipher.doFinal(bytes);

}

data = Base64.toBase64String(bytes);

return data;

} catch (Exception e) {

e.printStackTrace();

return null;

}

}

/**

* cbc 解密 times 次

* @param data

* @param salt

* @param times

* @return

* @throws GeneralSecurityException

*/

public static String decryptCbcDataTimes(String data, String salt, int times) throws GeneralSecurityException {

try {

byte[] iv = generateKey();

byte[] bytes = Base64.decode(data);

byte[] key = generateKey(salt);

Cipher cipher = generateCbcCipher(ENCRYPT_MODE, key, iv);

for(int i = 0; i < times; ++i) {

bytes = cipher.doFinal(bytes);

}

data = new String(bytes);

return data;

} catch (BadPaddingException | IllegalBlockSizeException | NoSuchPaddingException | NoSuchProviderException | NoSuchAlgorithmException | InvalidKeyException var5) {

throw new GeneralSecurityException(“SM4解密失败”);

}

}

}

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