Java AES CBC模式加解密
2021/10/20 11:39:45
本文主要是介绍Java AES CBC模式加解密,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!
密钥key是前端传递过来的密码,由于前端的密码长度是不固定的,AES CBC模式下的加解密只支持16/32/64位,所以先将密码进行MD5加密生成32位字符串再进行加解密。
import org.apache.commons.codec.binary.Base64; import javax.crypto.Cipher; import javax.crypto.spec.IvParameterSpec; import javax.crypto.spec.SecretKeySpec; import java.security.MessageDigest; public class AESUtils { private static final String initVector = "encryptionIntVec"; /** * 根据密码进行文件内容加密 * * @param password 密码 * @param value 文件内容 * @return 先对前端输入的 md5 加密 生成32位字符串 * @throws Exception */ public static String encrypt(String password, String value) { try { String key = md5(password); IvParameterSpec iv = new IvParameterSpec(initVector.getBytes("UTF-8")); SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes("UTF-8"), "AES"); Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING"); cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv); byte[] encrypted = cipher.doFinal(value.getBytes()); return Base64.encodeBase64String(encrypted); } catch (Exception ex) { ex.printStackTrace(); } return null; } public static String decrypt(String password, String encrypted) { try { String key = md5(password); IvParameterSpec iv = new IvParameterSpec(initVector.getBytes("UTF-8")); SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes("UTF-8"), "AES"); Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING"); cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv); byte[] original = cipher.doFinal(Base64.decodeBase64(encrypted)); return new String(original); } catch (Exception ex) { ex.printStackTrace(); } return null; } /*** * MD5加密 生成32位md5码 * @param inStr 待加密字符串 * @return 返回32位md5码 */ public static String md5(String inStr) throws Exception { MessageDigest md5 = null; try { md5 = MessageDigest.getInstance("MD5"); } catch (Exception e) { System.out.println(e.toString()); e.printStackTrace(); return ""; } byte[] byteArray = inStr.getBytes("UTF-8"); byte[] md5Bytes = md5.digest(byteArray); StringBuffer hexValue = new StringBuffer(); for (int i = 0; i < md5Bytes.length; i++) { int val = ((int) md5Bytes[i]) & 0xff; if (val < 16) { hexValue.append("0"); } hexValue.append(Integer.toHexString(val)); } return hexValue.toString(); } public static void main(String[] args) throws Exception { String password = "123456789&"; System.out.println(md5(password)); String originalString = "62647476889578背后的而韩国回复"; System.out.println("Original String to encrypt:" + originalString); String encryptedString = encrypt(password, originalString); System.out.println("Encrypted String:" + encryptedString); System.out.println(decrypt(password, encryptedString)); } }
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