Android 数据SM4传输加解密

第一：场景介绍

  甲方要求，数据在传输过程中要加密。

第二：选择加解密方式：

这里面Android 和服务端都是选择SM4

第三：实现方式

服务端采用SpringBoot，在pom.xml 文件下添加依赖

org.bouncycastlebcprov-jdk15on1.64

在Android 端同样添加依赖，在module 下面build.gradle

  implementation group: 'org.bouncycastle', name: 'bcprov-jdk15on', version: '1.64'

服务端SM4工具类

package com.wansun.datahouse.visit.utils;import org.apache.Tomcat.util.buf.HexUtils;import org.bouncycastle.jce.provider.BouncyCastleProvider;import javax.crypto.BadPaddingException;import javax.crypto.Cipher;import javax.crypto.IllegalBlockSizeException;import javax.crypto.KeyGenerator;import javax.crypto.NoSuchPaddingException;import javax.crypto.spec.IvParameterSpec;import javax.crypto.spec.SecreTKEySpec;import java.security.InvalidAlGorithmParameterException;import java.security.InvalidKeyException;import java.security.Key;import java.security.NoSuchAlgorithmException;import java.security.NoSuchProviderException;import java.security.SecureRandom;import java.security.Security;public class Sm4Util {        public static final String ALGORITHM_NAME = "SM4";        public static final String ALGORITHM_NAME_ECB_PADDING = "SM4/ECB/PKCS5Padding";        public static final String ALGORITHM_NAME_ECB_NOPADDING = "SM4/ECB/NoPadding";        public static final String ALGORITHM_NAME_CBC_PADDING = "SM4/CBC/PKCS5Padding";        public static final String ALGORITHM_NAME_CBC_NOPADDING = "SM4/CBC/NoPadding";        public static final int DEFAULT_KEY_SIZE = 128;    static {        // 加入 BC 实现        Security.addProvider(new BouncyCastleProvider());    }        private static byte[] generateKey() throws NoSuchAlgorithmException, NoSuchProviderException {        return generateKey(DEFAULT_KEY_SIZE);    }        private static byte[] generateKey(int keySize) throws NoSuchAlgorithmException, NoSuchProviderException {        KeyGenerator kg = KeyGenerator.getInstance(ALGORITHM_NAME, BouncyCastleProvider.PROVIDER_NAME);        kg.init(keySize, new SecureRandom());        return kg.generateKey().getEncoded();    }        private static Cipher generateEcbCipher(String algorithmName, int mode, byte[] key)            throws NoSuchAlgorithmException, NoSuchProviderException, NoSuchPaddingException,            InvalidKeyException {        Cipher cipher = Cipher.getInstance(algorithmName, BouncyCastleProvider.PROVIDER_NAME);        Key sm4Key = new SecretKeySpec(key, ALGORITHM_NAME);        cipher.init(mode, sm4Key);        return cipher;    }        private static byte[] encryptEcbPadding(byte[] key, byte[] data)            throws InvalidKeyException, NoSuchAlgorithmException, NoSuchProviderException,            NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException {        Cipher cipher = generateEcbCipher(ALGORITHM_NAME_ECB_PADDING, Cipher.ENCRYPT_MODE, key);        return cipher.doFinal(data);    }        private static byte[] decryptEcbPadding(byte[] key, byte[] cipherText)            throws IllegalBlockSizeException, BadPaddingException, InvalidKeyException,            NoSuchAlgorithmException, NoSuchProviderException, NoSuchPaddingException {        Cipher cipher = generateEcbCipher(ALGORITHM_NAME_ECB_PADDING, Cipher.DECRYPT_MODE, key);        return cipher.doFinal(cipherText);    }        private static byte[] encryptEcbNoPadding(byte[] key, byte[] data)            throws InvalidKeyException, NoSuchAlgorithmException, NoSuchProviderException,            NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException {        Cipher cipher = generateEcbCipher(ALGORITHM_NAME_ECB_NOPADDING, Cipher.ENCRYPT_MODE, key);        return cipher.doFinal(data);    }        private static byte[] decryptEcbNoPadding(byte[] key, byte[] cipherText)            throws IllegalBlockSizeException, BadPaddingException, InvalidKeyException,            NoSuchAlgorithmException, NoSuchProviderException, NoSuchPaddingException {        Cipher cipher = generateEcbCipher(ALGORITHM_NAME_ECB_NOPADDING, Cipher.DECRYPT_MODE, key);        return cipher.doFinal(cipherText);    }        private static Cipher generateCbcCipher(String algorithmName, int mode, byte[] key, byte[] iv)            throws InvalidKeyException, InvalidAlgorithmParameterException, NoSuchAlgorithmException,            NoSuchProviderException, NoSuchPaddingException {        Cipher cipher = Cipher.getInstance(algorithmName, BouncyCastleProvider.PROVIDER_NAME);        Key sm4Key = new SecretKeySpec(key, ALGORITHM_NAME);        IvParameterSpec ivParameterSpec = new IvParameterSpec(iv);        cipher.init(mode, sm4Key, ivParameterSpec);        return cipher;    }        private static byte[] encryptCbcPadding(byte[] key, byte[] iv, byte[] data)            throws InvalidKeyException, NoSuchAlgorithmException, NoSuchProviderException,            NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException,            InvalidAlgorithmParameterException {        Cipher cipher = generateCbcCipher(ALGORITHM_NAME_CBC_PADDING, Cipher.ENCRYPT_MODE, key, iv);        return cipher.doFinal(data);    }        private static byte[] decryptCbcPadding(byte[] key, byte[] iv, byte[] cipherText)            throws IllegalBlockSizeException, BadPaddingException, InvalidKeyException,            NoSuchAlgorithmException, NoSuchProviderException, NoSuchPaddingException,            InvalidAlgorithmParameterException {        Cipher cipher = generateCbcCipher(ALGORITHM_NAME_CBC_PADDING, Cipher.DECRYPT_MODE, key, iv);        return cipher.doFinal(cipherText);    }        private static byte[] encryptCbcNoPadding(byte[] key, byte[] iv, byte[] data)            throws InvalidKeyException, NoSuchAlgorithmException, NoSuchProviderException,            NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException,            InvalidAlgorithmParameterException {        Cipher cipher = generateCbcCipher(ALGORITHM_NAME_CBC_NOPADDING, Cipher.ENCRYPT_MODE, key, iv);        return cipher.doFinal(data);    }        private static byte[] decryptCbcNoPadding(byte[] key, byte[] iv, byte[] cipherText)            throws IllegalBlockSizeException, BadPaddingException, InvalidKeyException,            NoSuchAlgorithmException, NoSuchProviderException, NoSuchPaddingException,            InvalidAlgorithmParameterException {        Cipher cipher = generateCbcCipher(ALGORITHM_NAME_CBC_NOPADDING, Cipher.DECRYPT_MODE, key, iv);        return cipher.doFinal(cipherText);    }        public static String generateKey_Hex() throws Exception {        return HexUtils.toHexString(generateKey());    }        public static String encryptCbcPaddingHex(String key, String iv, String data) throws Exception {        String iv_hex = HexUtils.toHexString(iv.getBytes());        return HexUtils.toHexString(encryptCbcPadding(HexUtils.fromHexString(key),                HexUtils.fromHexString(iv_hex), data.getBytes()));    }        public static String decryptCbcPaddingHex(String key, String iv, String cipherText) throws Exception {        return new String(decryptCbcPadding(HexUtils.fromHexString(key), iv.getBytes(),                HexUtils.fromHexString(cipherText)));    }    public static void main(String[] args) throws Exception {        String data = "{\"test\":\"湖北利川深圳\"}";        String iv = "blade12345678910";//        String hexKey = generateKey_Hex();        String hexKey = "20785fae41a54c65ab95d2db1abc7f9f";        System.out.println("hexKey===" + hexKey);        String cipher = encryptCbcPaddingHex(hexKey, iv, data);        System.out.println("cipher==" + cipher);        String b = decryptCbcPaddingHex(hexKey, iv, cipher);        System.out.println(b);    }}

Android SM4 工具类，要把 

BouncyCastleProvider.PROVIDER_NAME 贴换为 new BouncyCastleProvider()  不然报错

分别在拦截器里面调用 加解密方法。hexKey 可以自己生成。iv 自己定义16位

    String hexKey = "20785fae41a54c65ab95d2db1abc7f9f";    String iv = "blade12345678910";

加密方法：

String encryptJSON = Sm4Util.encryptCbcPaddingHex(hexKey, iv, String.valueOf(json));

解密方法：

 String decryptJson = Sm4Util.decryptCbcPaddingHex(hexKey, iv, String.valueOf(data));

这里面就不展示拦截器里面的代码。

截图展示加解密后的效果。

来源地址：https://blog.csdn.net/beautifulYuan/article/details/129528518