自己编写的java web项目每次重启后登录都会报下面错误：
javax.crypto.AEADBadTagException: Tag mismatch!
有道翻译的了一下，意思是加密异常，标签不匹配。
错误堆栈：
org.apache.shiro.crypto.CryptoException: Unable to execute 'doFinal' with cipher instance [javax.crypto.Cipher@17359b49]. at org.apache.shiro.crypto.JcaCipherService.crypt(JcaCipherService.java:462) at org.apache.shiro.crypto.JcaCipherService.crypt(JcaCipherService.java:445) at org.apache.shiro.crypto.JcaCipherService.decrypt(JcaCipherService.java:390) at org.apache.shiro.crypto.JcaCipherService.decrypt(JcaCipherService.java:382) at org.apache.shiro.mgt.AbstractRememberMeManager.decrypt(AbstractRememberMeManager.java:482) at org.apache.shiro.mgt.AbstractRememberMeManager.convertBytesToPrincipals(AbstractRememberMeManager.java:419) at org.apache.shiro.mgt.AbstractRememberMeManager.getRememberedPrincipals(AbstractRememberMeManager.java:386) at org.apache.shiro.mgt.DefaultSecurityManager.getRememberedIdentity(DefaultSecurityManager.java:613) at org.apache.shiro.mgt.DefaultSecurityManager.resolvePrincipals(DefaultSecurityManager.java:501) at org.apache.shiro.mgt.DefaultSecurityManager.createSubject(DefaultSecurityManager.java:347) at org.apache.shiro.subject.Subject$Builder.buildSubject(Subject.java:845) at org.apache.shiro.web.subject.WebSubject$Builder.buildWebSubject(WebSubject.java:148) at org.apache.shiro.web.servlet.AbstractShiroFilter.createSubject(AbstractShiroFilter.java:292) at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:359) at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1590) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:748) Caused by: javax.crypto.AEADBadTagException: Tag mismatch! at com.sun.crypto.provider.GaloisCounterMode.decryptFinal(GaloisCounterMode.java:620) at com.sun.crypto.provider.CipherCore.finalNoPadding(CipherCore.java:1116) at com.sun.crypto.provider.CipherCore.fillOutputBuffer(CipherCore.java:1053) at com.sun.crypto.provider.CipherCore.doFinal(CipherCore.java:853) at com.sun.crypto.provider.AESCipher.engineDoFinal(AESCipher.java:446) at javax.crypto.Cipher.doFinal(Cipher.java:2168) at org.apache.shiro.crypto.JcaCipherService.crypt(JcaCipherService.java:459) ... 44 common frames omitted
问题产生的缘由是rememberMe的cookie在第二次打开页面后shiro没法解密，通过查询资料以及代码跟踪发现了缘由所在。
先附上rememberMe管理器配置
/** * cookie管理对象;记住我功能 * * @return */ public CookieRememberMeManager rememberMeManager() { CookieRememberMeManager cookieRememberMeManager = new CookieRememberMeManager(); cookieRememberMeManager.setCookie(rememberMeCookie()); return cookieRememberMeManager; }
导致原因：
rememberMeManager继承了AbstractRememberMeManager，然而AbstractRememberMeManager的构造方法中每次都会重新生成对称加密密钥，意味着每次重启程序都会重新生成一对加解密密钥。
这就会导致了，第一次启动程序shiro使用A密钥加密了cookie，第二次启动程序shiro重新生成了密钥B，当用户访问页面时，shiro会用密钥B去解密上一次用密钥A加密的cookie，导致解密失败，导致报错，所以这不影响用户登录操作(rememberMe失效罢了)，所以这种异常只会在程序重启(shiro清除session)第一次打开页面的时候出现。
解决办法：
手动设置对称加密秘钥。修改后rememberMe管理器配置
/** * cookie管理对象;记住我功能 * * @return */ public CookieRememberMeManager rememberMeManager() { CookieRememberMeManager cookieRememberMeManager = new CookieRememberMeManager(); cookieRememberMeManager.setCookie(rememberMeCookie()); //手动设置对称加密秘钥，防止重启系统后系统生成新的随机秘钥，防止导致客户端cookie无效 cookieRememberMeManager.setCipherKey(Base64.decode("6ZmI6I2j3Y+R1aSn5BOlAA==")); return cookieRememberMeManager; }
