AES256-GCM-NOPADDING加密解密(java)

AES256-GCM-NOPADDING安全加密解密

import org.apache.commons.codec.binary.Hex;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.spec.GCMParameterSpec;
import java.nio.charset.StandardCharsets;
import java.security.Key;
import java.security.SecureRandom;
import java.security.Security;
import java.util.Set;/*** @author: mek* Date: 2023-2-6* Time: 8:40* vx: 250023777* Description: AES_256/GCM/NOPADDING加解密* @version: 1.0*/
public class AES256GCMUtil {private final static String ALGO = "AES_256/GCM/NOPADDING";public static final int AES_KEY_SIZE = 256;public static final int GCM_IV_LENGTH = 12;public static final int TLEN = 128;static {Set<String> algorithms = Security.getAlgorithms("Cipher");if (!algorithms.contains(ALGO)) {throw new IllegalArgumentException("AES256加解密系统不可用");}}public String encrypt(String txt, String pwd) throws Exception {Cipher cipher = Cipher.getInstance(ALGO);byte[] iv = new byte[GCM_IV_LENGTH];SecureRandom secureRandom = new SecureRandom();secureRandom.nextBytes(iv);cipher.init(Cipher.ENCRYPT_MODE, generateKey(pwd), new GCMParameterSpec(TLEN, iv));//iv和加密后的字节数组进行组合（用于解密时获取iv和加密内容）byte[] txtBytes = txt.getBytes(StandardCharsets.UTF_8);byte[] enctyptBytes = cipher.doFinal(txtBytes);byte[] message = new byte[GCM_IV_LENGTH + enctyptBytes.length];System.arraycopy(iv, 0, message, 0, GCM_IV_LENGTH);System.arraycopy(enctyptBytes, 0, message, GCM_IV_LENGTH, enctyptBytes.length);return Hex.encodeHexString(message);}public String decrypt(String txt, String pwd) throws Exception {//分离iv和加密内容byte[] txtBytes = Hex.decodeHex(txt.toCharArray());byte[] iv = new byte[GCM_IV_LENGTH];byte[] content = new byte[txtBytes.length - GCM_IV_LENGTH];System.arraycopy(txtBytes, 0, iv, 0, GCM_IV_LENGTH);System.arraycopy(txtBytes, GCM_IV_LENGTH, content, 0, content.length);Cipher cipher = Cipher.getInstance(ALGO);GCMParameterSpec params = new GCMParameterSpec(TLEN, iv);cipher.init(Cipher.DECRYPT_MODE, generateKey(pwd), params);return new String(cipher.doFinal(content), StandardCharsets.UTF_8);}public Key generateKey(String keystr) throws Exception {KeyGenerator kg = KeyGenerator.getInstance("AES");SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG", "SUN");secureRandom.setSeed(keystr.getBytes(StandardCharsets.UTF_8));kg.init(AES_KEY_SIZE, secureRandom);return kg.generateKey();}public static void main(String[] args) throws Exception {//testAES256GCMUtil app = new AES256GCMUtil();String content = "小白痴，stupid:666+-*/";String encryptStr = app.encrypt(content, "aaaa");System.out.println("原始内容：" + content);System.out.println("加密内容：" + encryptStr);System.out.println("解密内容：" + app.decrypt(encryptStr, "aaaa"));}
}

运行结果

原始内容：小白痴，stupid:666+-*/
加密内容：0d1cb615a90a174d9a7d27fdd697c22f9e620c07914768a570b86c67132299749122d2d6fb38d0d34bcf1d56d1fb4431b51524d8adf7
解密内容：小白痴，stupid:666+-*/

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AES256-GCM-NOPADDING加密解密(java)

AES256-GCM-NOPADDING安全加密解密

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