本文主要是介绍Java实现AES的ECB、CBC、CFB模式，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
public class AES {/*** AES加密** @param plaintext 明文* @param Key 密钥* @param EncryptMode AES加密模式，CBC或ECB* @return 该字符串的AES密文值*/public static String AES_Encrypt(Object plaintext, String Key,String EncryptMode) {String PlainText=null;try {PlainText=plaintext.toString();if (Key == null) {return null;}Key = getMD5(Key);byte[] raw = Key.getBytes("utf-8");SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");Cipher cipher = Cipher.getInstance("AES/"+EncryptMode+"/PKCS5Padding");if(EncryptMode=="ECB") {cipher.init(Cipher.ENCRYPT_MODE, skeySpec);}else {IvParameterSpec iv = new IvParameterSpec(Key.getBytes("utf-8"));//使用CBC模式，需要一个向量iv，可增加加密算法的强度cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);}byte[] encrypted = cipher.doFinal(PlainText.getBytes("utf-8"));String encryptedStr=new String(new BASE64Encoder().encode(encrypted));return encryptedStr;//return new String(encrypted);//此处使用BASE64做转码功能，同时能起到2次加密的作用。} catch (Exception ex) {System.out.println(ex.toString());return null;}}/*** AES解密** @param cipertext 密文* @param Key 密钥* @param EncryptMode AES加密模式，CBC或ECB* @return 该密文的明文*/public static String AES_Decrypt(Object cipertext, String Key,String EncryptMode) {String CipherText=null;try {CipherText=cipertext.toString();// 判断Key是否正确if (Key == null) {//System.out.print("Key为空null");return null;}Key=getMD5(Key);byte[] raw = Key.getBytes("utf-8");SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");Cipher cipher=Cipher.getInstance("AES/"+EncryptMode+"/PKCS5Padding");if(EncryptMode=="ECB") {cipher.init(Cipher.DECRYPT_MODE, skeySpec);}else{IvParameterSpec iv = new IvParameterSpec(Key.getBytes("utf-8"));//使用CBC模式，需要一个向量iv，可增加加密算法的强度cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);}byte[] encrypted1 = new BASE64Decoder().decodeBuffer(CipherText);//先用base64解密//byte[] encrypted1 = CipherText.getBytes();try {byte[] original = cipher.doFinal(encrypted1);String originalString = new String(original,"utf-8");return originalString;} catch (Exception e) {System.out.println(e.toString());return null;}} catch (Exception ex) {System.out.println(ex.toString());return null;}}/*** 进行MD5加密** @param s 要进行MD5转换的字符串* @return 该字符串的MD5值的8-24位*/public static String getMD5(String s){char hexDigits[]={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};try {byte[] btInput = s.getBytes();// 获得MD5摘要算法的 MessageDigest 对象MessageDigest mdInst = MessageDigest.getInstance("MD5");// 使用指定的字节更新摘要mdInst.update(btInput);// 获得密文byte[] md = mdInst.digest();// 把密文转换成十六进制的字符串形式int j = md.length;char str[] = new char[j * 2];int k = 0;for (int i = 0; i < j; i++) {byte byte0 = md[i];str[k++] = hexDigits[byte0 >>> 4 & 0xf];str[k++] = hexDigits[byte0 & 0xf];}return new String(str).substring(8,24);} catch (Exception e) {e.printStackTrace();return null;}}
}
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