SM4加密实现之JAVA方式

短命女 2023-10-13 21:05 30阅读 0赞

package com.xxxx.tax.util;
    import org.apache.commons.codec.binary.Hex;
    import org.bouncycastle.jce.provider.BouncyCastleProvider;
    import org.bouncycastle.pqc.math.linearalgebra.ByteUtils;
    
    import lombok.extern.log4j.Log4j;
    
    import javax.crypto.Cipher;
    import javax.crypto.KeyGenerator;
    import javax.crypto.spec.SecretKeySpec;
    import java.security.Key;
    import java.security.SecureRandom;
    import java.security.Security;
    import java.util.Arrays;
    @Log4j
    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_PADDING = "SM4/ECB/PKCS5Padding";
        // 128-32位16进制；256-64位16进制
        public static final int DEFAULT_KEY_SIZE = 128;
        
        /**
         * 自动生成密钥
         *
         * @return
         * @explain
         */
        public static String generateKey() throws Exception {
            return new String(Hex.encodeHex(generateKey(DEFAULT_KEY_SIZE),false));
        }
        
        /**
         * @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();
        }
        
        /**
         * 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;
        }
        
        /**
         * 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
         * @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) {
            try {
                String cipherText = "";
                // 16进制字符串-->byte[]
                byte[] keyData = ByteUtils.fromHexString(hexKey);
                // 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);
                return cipherText;
            } catch (Exception e) {
                return paramStr;
            }
        }
        
        /**
         * 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
         * @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(byte[] hexKey, String paramStr) {
            try {
                String cipherText = "";
                // 16进制字符串-->byte[]
                byte[] keyData = hexKey;
                // 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);
                return cipherText;
            } catch (Exception e) {
                return paramStr;
            }
        }
        
        /**
         * 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) {
            // 用于接收解密后的字符串
            String decryptStr = "";
            // hexString-->byte[]
            byte[] keyData = ByteUtils.fromHexString(hexKey);
            // hexString-->byte[]
            byte[] cipherData = ByteUtils.fromHexString(cipherText);
            // 解密
            byte[] srcData = new byte[0];
            try {
                srcData = decrypt_Ecb_Padding(keyData, cipherData);
                // byte[]-->String
                decryptStr = new String(srcData, ENCODING);
            } catch (Exception e) {
                log.error(ExceptionUtil.getMessage(e));
            }
            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);
            // 将16进制字符串转换成数组
            byte[] cipherData = ByteUtils.fromHexString(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;
        }
        
        /**
         * 字符串转16进制
         * @param hex
         * @return
         */
    public static byte[] hex2byte(String hex) {
    
            String digital = "0123456789ABCDEF";
            String hex1 = hex.replace(" ", "");
            char[] hex2char = hex1.toCharArray();
            byte[] bytes = new byte[hex1.length() / 2];
            byte temp;
            for (int p = 0; p < bytes.length; p++) {
                temp = (byte) (digital.indexOf(hex2char[2 * p]) * 16);
                temp += digital.indexOf(hex2char[2 * p + 1]);
                bytes[p] = (byte) (temp & 0xff);
            }
            return bytes;
        }
    
    
    	public static String u(String e) {
    		String t = "";
    		        for (int n = 0; n < e.length(); n++) {
    		        	if("".equals(t)) {
    		        		t = HexStrUtil.str2HexStr(e.charAt(n)+"");
    		        	}else {
    		        		t += HexStrUtil.str2HexStr(e.charAt(n)+"");
    		        	}
    		        }
    	    return t;
    	}
        
        
    }

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