AES的加解密： AES 256加密支持 java中的AES 256算法遇到 Illegal key size or default parameters错的解决办法
解决方法：
http://stackoverflow.com/questions/6481627/java-security-illegal-key-size-or-default-parameters
JDK8 jar包下载地址：
http://www.oracle.com/technetwork/java/javase/downloads/jce8-download-2133166.html
JDK7 jar包下载地址：
http://www.oracle.com/technetwork/java/javase/downloads/jce-7-download-432124.html
JDK6 jar包下载地址：
http://www.oracle.com/technetwork/java/javase/downloads/jce-6-download-429243.html
1.在 jdk安装目录中（%JAVA_HOME%jrelibext）添加 jar 包 bcprov-jdk16-1.46.jar。2.在 jdk安装目录下（ %JAVA_HOME%jrelibsecurity ）修改 java.security 文件，将第74行(我的是在74行)的 security.provider.7=com.sun.security.sasl.Provider 替换为security.provider.7=org.bouncycastle.jce.provider.BouncyCastleProvider3.替换（ %JAVA_HOME%jrelibsecurity ）下面的local_policy.jar和US_export_policy.jar备注：JDK1.8.0_151无需去官网下载 local_policy.jar US_export_policy.jar这个jar包，只需要修改Javajdk1.8.0_151jrelibsecurity这目录下的java.security文件配置即可。从Java 1.8.0_151和1.8.0_152开始，为JVM启用 无限制强度管辖策略 有了一种新的更简单的方法。如果不启用此功能，则不能使用AES-256。crypto.policy=unlimited 测试代码使用jdk1.8.0_131 ，详细代码如下： AES 256位 带偏移量 加解密算法 import sun.misc.BASE64Decoder;import sun.misc.BASE64Encoder;import javax.crypto.Cipher;import javax.crypto.spec.IvParameterSpec;import javax.crypto.spec.SecretKeySpec;/** * AES加密工具类：256位 不带偏移量 * * @author lilinshen * @date 2021/03/31 */public class AesUtils { //偏移量 public static final String VIPARA = "f%Z4F+qtFh624970"; //编码方式 public static final String CODE_TYPE = "UTF-8"; //填充类型（注：CBC） public static final String AES_TYPE = "AES/CBC/PKCS7Padding"; //私钥,AES固定格式为128/192/256 bits.即：16/24/32bytes private static final String AES_KEY = "AG+BwcnekYZy$9f7X#b2zdB93brfFMmz"; /** * 加密带偏移量 */ public static String encrypt(String cleartext) { try { IvParameterSpec zeroIv = new IvParameterSpec(VIPARA.getBytes()); SecretKeySpec key = new SecretKeySpec(AES_KEY.getBytes(), "AES"); Cipher cipher = Cipher.getInstance(AES_TYPE); cipher.init(Cipher.ENCRYPT_MODE, key, zeroIv); byte[] encryptedData = cipher.doFinal(cleartext.getBytes(CODE_TYPE)); return new BASE64Encoder().encode(encryptedData); } catch (Exception e) { e.printStackTrace(); return ""; } } /** * 解密带偏移量 */ public static String decrypt(String encrypted) { try { byte[] byteMi = new BASE64Decoder().decodeBuffer(encrypted); IvParameterSpec zeroIv = new IvParameterSpec(VIPARA.getBytes()); SecretKeySpec key = new SecretKeySpec(AES_KEY.getBytes(), "AES"); Cipher cipher = Cipher.getInstance(AES_TYPE); cipher.init(Cipher.DECRYPT_MODE, key, zeroIv); byte[] decryptedData = cipher.doFinal(byteMi); return new String(decryptedData, CODE_TYPE); } catch (Exception e) { e.printStackTrace(); return ""; } } /** * 测试 * * @param args * @throws Exception */ public static void main(String[] args) throws Exception { String content = "{"vid":73160,"road":"default1","timestamp":1585815671868,"devicetype":"pc","encode_sign":"a069831103819c3c76a23fa084747bac"}"; System.out.println(encryptPy(content)); System.out.println(decryptPy(encryptPy(content))); }} AES 128位 不带偏移量 加解密算法 import sun.misc.BASE64Decoder;import sun.misc.BASE64Encoder;import javax.crypto.Cipher;import javax.crypto.spec.IvParameterSpec;import javax.crypto.spec.SecretKeySpec;/** * AES加密工具类：128位 不带偏移量 * * @author lilinshen * @date 2021/03/31 */public class AesUtils { //编码方式 public static final String CODE_TYPE = "UTF-8"; //填充类型（注：ECB） public static final String AES_TYPE = "AES/ECB/PKCS7Padding"; //私钥,AES固定格式为128/192/256 bits.即：16/24/32bytes private static final String AES_KEY = "46cc793c53dc451b"; /** * 加密不带偏移量 */ public static String encrypt(String cleartext) { try { SecretKeySpec sKey = new SecretKeySpec(AES_KEY.getBytes(), "AES"); Cipher cipher = Cipher.getInstance(AES_TYPE); cipher.init(Cipher.ENCRYPT_MODE, sKey); byte[] decrypted = cipher.doFinal(cleartext.getBytes(CODE_TYPE)); return Base64.encodeBase64String(decrypted); } catch (Exception e) { e.printStackTrace(); return ""; } } /** * 解密不带偏移量 */ public static String decrypt(String content) { try { byte[] sourceBytes = Base64.decodeBase64(content); Cipher cipher = Cipher.getInstance(AES_TYPE); cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(AES_KEY.getBytes(), "AES")); byte[] decoded = cipher.doFinal(sourceBytes); return new String(decoded, CODE_TYPE); } catch (Exception e) { e.printStackTrace(); return ""; } } /** * 测试 * * @param args * @throws Exception */ public static void main(String[] args) throws Exception { String content = "{"vid":73160,"road":"default1","timestamp":1585815671868,"devicetype":"pc","encode_sign":"a069831103819c3c76a23fa084747bac"}"; System.out.println(encrypt(content)); System.out.println(decrypt(encrypt(content))); }}