Java 实现 国密SM4/ECB/PKCS7Padding对称加密解密，为了演示方便本问使用的是IntelliJ IDEA 2022.1 (Community Edition)来构建代码的
1、pom.xml文件添加需要的jar
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>org.example</groupId> <artifactId>SM345</artifactId> <version>1.0-SNAPSHOT</version> <properties> <maven.compiler.source>8</maven.compiler.source> <maven.compiler.target>8</maven.compiler.target> </properties> <dependencies> <!--sm3,sm4加密算法--> <dependency> <groupId>org.bouncycastle</groupId> <artifactId>bcprov-jdk15on</artifactId> <version>1.66</version> </dependency> </dependencies> </project>
2、java代码
import java.nio.charset.StandardCharsets; import java.security.Key; import java.security.NoSuchAlgorithmException; import java.security.NoSuchProviderException; import java.security.SecureRandom; import java.security.Security; import java.util.Arrays; import javax.crypto.Cipher; import javax.crypto.KeyGenerator; import javax.crypto.spec.SecretKeySpec; import org.bouncycastle.jce.provider.BouncyCastleProvider; import org.bouncycastle.pqc.math.linearalgebra.ByteUtils; import org.apache.commons.codec.binary.Base64; /** * sm4加密算法工具类 * * @author Marydon * @version 1.0 * @explain sm4加密、解密与加密结果验证 * 可逆算法 * @creationTime 2018年7月6日上午11:46:59 * @email marydon20170307@163.com * @since */ public class Sm4Util { static { Security.addProvider(new BouncyCastleProvider()); } private static final String ENCODING = "UTF-8"; public static final String ALGORITHM_NAME = "SM4"; // 加密算法/分组加密模式/分组填充方式 // PKCS5Padding-以8个字节为一组进行分组加密 // 定义分组加密模式使用：PKCS5Padding public static final String ALGORITHM_NAME_ECB_PADDING7 = "SM4/ECB/PKCS5Padding"; public static final String ALGORITHM_NAME_ECB_PADDING = "SM4/ECB/PKCS7Padding"; // 64-16位16进制；128-32位16进制；256-64位16进制 public static final int DEFAULT_KEY_SIZE = 128; /** * 生成ECB暗号 * * @param algorithmName 算法名称 * @param mode 模式 * @param key * @return * @throws Exception * @explain ECB模式（电子密码本模式：Electronic codebook） */ private static Cipher generateEcbCipher(String algorithmName, int mode, byte[] key) throws Exception { Cipher cipher = Cipher.getInstance(algorithmName, BouncyCastleProvider.PROVIDER_NAME); Key sm4Key = new SecretKeySpec(key, ALGORITHM_NAME); cipher.init(mode, sm4Key); return cipher; } // 产生密钥 /** * 自动生成密钥 * * @return * @throws NoSuchAlgorithmException * @throws NoSuchProviderException * @explain */ public static byte[] generateKey() throws Exception { return generateKey(DEFAULT_KEY_SIZE); } /** * @param keySize * @return * @throws Exception * @explain */ public static byte[] generateKey(int keySize) throws Exception { KeyGenerator kg = KeyGenerator.getInstance(ALGORITHM_NAME, BouncyCastleProvider.PROVIDER_NAME); kg.init(keySize, new SecureRandom()); return kg.generateKey().getEncoded(); } /** * sm4加密 * * @param hexKey 16进制密钥（忽略大小写） * @param paramStr 待加密字符串 * @return 返回16进制的加密字符串 * @throws Exception * @explain 加密模式：ECB * 密文长度不固定，会随着被加密字符串长度的变化而变化 */ public static String encryptEcb(String hexKey, String paramStr) throws Exception { String cipherText = ""; // 16进制字符串-->byte[] //byte[] keyData = ByteUtils.fromHexString(hexKey); byte[] keyData = hexKey.getBytes(ENCODING); // String-->byte[] byte[] srcData = paramStr.getBytes(ENCODING); // 加密后的数组 byte[] cipherArray = encrypt_Ecb_Padding(keyData, srcData); // byte[]-->hexString //cipherText = ByteUtils.toHexString(cipherArray); cipherText = Base64.encodeBase64String(cipherArray); return cipherText; } /** * 加密模式之Ecb * * @param key * @param data * @return * @throws Exception * @explain */ public static byte[] encrypt_Ecb_Padding(byte[] key, byte[] data) throws Exception { Cipher cipher = generateEcbCipher(ALGORITHM_NAME_ECB_PADDING, Cipher.ENCRYPT_MODE, key); return cipher.doFinal(data); } /** * sm4解密 * * @param hexKey 16进制密钥 * @param cipherText 16进制的加密字符串（忽略大小写） * @return 解密后的字符串 * @throws Exception * @explain 解密模式：采用ECB */ public static String decryptEcb(String hexKey, String cipherText) throws Exception { // 用于接收解密后的字符串 String decryptStr = ""; // hexString-->byte[] //byte[] keyData = ByteUtils.fromHexString(hexKey); byte[] keyData = hexKey.getBytes(ENCODING); // hexString-->byte[] //byte[] cipherData = ByteUtils.fromHexString(cipherText); byte[] cipherData =Base64.decodeBase64(cipherText); // 解密 byte[] srcData = decrypt_Ecb_Padding(keyData, cipherData); // byte[]-->String decryptStr = new String(srcData, ENCODING); return decryptStr; } /** * 解密 * * @param key * @param cipherText * @return * @throws Exception * @explain */ public static byte[] decrypt_Ecb_Padding(byte[] key, byte[] cipherText) throws Exception { Cipher cipher = generateEcbCipher(ALGORITHM_NAME_ECB_PADDING, Cipher.DECRYPT_MODE, key); return cipher.doFinal(cipherText); } /** * 校验加密前后的字符串是否为同一数据 * * @param hexKey 16进制密钥（忽略大小写） * @param cipherText 16进制加密后的字符串 * @param paramStr 加密前的字符串 * @return 是否为同一数据 * @throws Exception * @explain */ public static boolean verifyEcb(String hexKey, String cipherText, String paramStr) throws Exception { // 用于接收校验结果 boolean flag = false; // hexString-->byte[] //byte[] keyData = ByteUtils.fromHexString(hexKey); byte[] keyData = hexKey.getBytes(ENCODING); // 将16进制字符串转换成数组 //byte[] cipherData = ByteUtils.fromHexString(cipherText); byte[] cipherData = Base64.decodeBase64(cipherText); // 解密 byte[] decryptData = decrypt_Ecb_Padding(keyData, cipherData); // 将原字符串转换成byte[] byte[] srcData = paramStr.getBytes(ENCODING); // 判断2个数组是否一致 flag = Arrays.equals(decryptData, srcData); return flag; } }
3、本文用到了一个Base64的jar加包commons-codec-1.16.0.jar，import org.apache.commons.codec.binary.Base64;需要下载添加引用即可
选择 文件 项目结构 项目设置 库 点击最右边的+ 选择 下载的commons-codec-1.16.0.jar加包即可。
4、使用代码
import java.security.Key; import java.security.NoSuchAlgorithmException; import java.security.NoSuchProviderException; import java.security.SecureRandom; import java.security.Security; import java.util.Arrays; import javax.crypto.Cipher; import javax.crypto.KeyGenerator; import javax.crypto.spec.SecretKeySpec; import org.bouncycastle.jce.provider.BouncyCastleProvider; import org.bouncycastle.pqc.math.linearalgebra.ByteUtils; //import org.apache.commons.codec.binary.Hex; //import org.apache.commons.codec.binary.Base64; public class Longteng { public static void main(String[] args) { try { String json = "{\"name\":\"Marydon\",\"website\":\"http://www.cnblogs.com/Marydon20170307\"}"; json = "1234567890abcdefghijklmnopqrstuvwxyz"; System.out.println("国密SM4加密解密："); // 自定义的32位16进制密钥 // String key = "86C63180C2806ED1F47B859DE501215B"; String key = "1234567890123456"; String cipher = Sm4Util.encryptEcb(key, json); System.out.println("国密SM4加密解密：\r\n密钥：" + key + " \n加密内容：" + json + " \n加密后v" + cipher); //System.out.println(cipher);//比对加密解密信息 System.out.println(Sm4Util.verifyEcb(key, cipher, json));// true json = Sm4Util.decryptEcb(key, cipher); System.out.println("国密SM4加密解密：\n密钥：" + key + " \n加密内容：" + cipher + " \n解密后：" + json); //System.out.println(json); } catch (Exception e) { e.printStackTrace(); } } }