java运用SM4国密算法对文件的加密与解密的实现

1. <dependency>
2. <groupId>com.hutool</groupId>
3. <artifactId>all</artifactId>
4. <version>4.6.17</version>
5. <scope>system</scope>
6. <systemPath>${project.basedir}/src/main/webapp/lib/sm4/hutool-all-4.6.17.jar</systemPath>
7. </dependency>
8. <dependency>
9. <groupId>com.bcprov</groupId>
10. <artifactId>jdk15on</artifactId>
11. <version>1.59</version>
12. <scope>system</scope>
13. <systemPath>${project.basedir}/src/main/webapp/lib/sm4/bcprov-jdk15on-1.59.jar</systemPath>
14. </dependency>

首先我们在idae开发工具导入导入pom.xml的两个必要依赖

 jar包下载地址：百度网盘 请输入提取码   npn8

 图上systemPath为jar包的文件路径，我们需要使用以下的路径存储jar包。（也可以自己设置）

java包的文件路径如图所示

然后创建所需要加密的文件 ，需要加密的文件内容，并保存文件加密的地址。

以下是代码实现:

使用密钥"0123456789abcdeffedcba9876543210"对文件加解密

1. import java.io.ByteArrayInputStream;
2. import java.io.FileInputStream;
3. import java.io.FileNotFoundException;
4. import java.io.FileOutputStream;
5. import java.io.IOException;
6. import java.io.OutputStream;
7. import java.security.InvalidKeyException;
8. import java.security.Key;
9. import java.security.NoSuchAlgorithmException;
10. import java.security.NoSuchProviderException;
11. import java.security.Security;
12. import javax.crypto.Cipher;
13. import javax.crypto.CipherOutputStream;
14. import javax.crypto.NoSuchPaddingException;
15. import javax.crypto.spec.SecretKeySpec;
16. import cn.hutool.core.io.FileUtil;
17. import cn.hutool.core.io.IoUtil;
18. import org.bouncycastle.jcajce.io.CipherInputStream;
19. import org.bouncycastle.jce.provider.BouncyCastleProvider;
20. import org.bouncycastle.pqc.math.linearalgebra.ByteUtils;
22. public class SM4Tools {
23. public static void main(String[] args) throws Exception {
25. String sp = "D:\\sm4jiami\\tt\\tt.txt";//原始文件
26. String dp = "D:\\sm4jiami\\tt\\tt.txt加密文件";//加密后文件
27. String dp2 = "D:\\sm4jiami\\tt\\tt.txt解密文件";//解密后文件
29. // String key = "05d986b1141227cb20d46d0b56202024";
30. // byte[] keyData = ByteUtils.fromHexString(key);
31. //加密文件
32. encryptFile(sp,dp);
33. System.out.println("加密成功");
34. //解密文件
35. decryptFile(dp,dp2);
36. System.out.println("解密成功");
37. }
38. private static String key = "0123456789abcdeffedcba9876543210"; //使用到的密钥对文件加密
39. private static byte[] keyData = ByteUtils.fromHexString(key);
41. static{
42. if (Security.getProvider(BouncyCastleProvider.PROVIDER_NAME) == null){
43. //No such provider: BC
44. Security.addProvider(new BouncyCastleProvider());
45. }
46. }
48. //生成 Cipher
49. public static Cipher generateCipher(int mode,byte[] keyData) throws InvalidKeyException, NoSuchPaddingException, NoSuchAlgorithmException, NoSuchProviderException {
50. Cipher cipher = Cipher.getInstance("SM4/ECB/PKCS5Padding", BouncyCastleProvider.PROVIDER_NAME);
51. Key sm4Key = new SecretKeySpec(keyData, "SM4");
52. cipher.init(mode, sm4Key);
53. return cipher;
54. }
57. //加密文件
58. public static void encryptFile(String sourcePath,String targetPath){
59. //加密文件
60. try {
61. Cipher cipher = generateCipher(Cipher.ENCRYPT_MODE,keyData);
62. CipherInputStream cipherInputStream = new CipherInputStream(new FileInputStream(sourcePath), cipher);
63. FileUtil.writeFromStream(cipherInputStream, targetPath);
64. IoUtil.close(cipherInputStream);
65. } catch (InvalidKeyException e) {
66. e.printStackTrace();
67. } catch (NoSuchPaddingException e) {
68. e.printStackTrace();
69. } catch (NoSuchAlgorithmException e) {
70. e.printStackTrace();
71. } catch (NoSuchProviderException e) {
72. e.printStackTrace();
73. } catch (FileNotFoundException e) {
74. e.printStackTrace();
75. }
76. }
79. /**
80. * 解密文件
81. * @param sourcePath 待解密的文件路径
82. * @param targetPath 解密后的文件路径
83. */
84. public static void decryptFile(String sourcePath, String targetPath) {
85. FileInputStream in =null;
86. ByteArrayInputStream byteArrayInputStream =null;
87. OutputStream out = null;
88. CipherOutputStream cipherOutputStream=null;
89. try {
90. in = new FileInputStream(sourcePath);
91. byte[] bytes = IoUtil.readBytes(in);
92. byteArrayInputStream = IoUtil.toStream(bytes);
94. Cipher cipher = generateCipher(Cipher.DECRYPT_MODE,keyData);
96. out = new FileOutputStream(targetPath);
97. cipherOutputStream = new CipherOutputStream(out, cipher);
98. IoUtil.copy(byteArrayInputStream, cipherOutputStream);
99. } catch (IOException e) {
100. e.printStackTrace();
101. } catch (NoSuchPaddingException e) {
102. e.printStackTrace();
103. } catch (NoSuchAlgorithmException e) {
104. e.printStackTrace();
105. } catch (InvalidKeyException e) {
106. e.printStackTrace();
107. } catch (NoSuchProviderException e) {
108. e.printStackTrace();
109. }finally {
110. IoUtil.close(cipherOutputStream);
111. IoUtil.close(out);
112. IoUtil.close(byteArrayInputStream);
113. IoUtil.close(in);
114. }
115. }
116. }

运行代码

代码运行成功

我们可以看到文件路径上多了两个文件，分别是加解密后的文件

我们用右键选择打开方式，用文本的方式打开可以看到加密后的信息如下

ok我们加密成功了！同理解密的文件也能解密成功

以上就是java对sm4国密算法的加密解密方式。