Java 错误

May 21, 2018

Illegal key size

异常：java.security.InvalidKeyException: Illegal key size
解决：密钥长度修改为128位或者使用JCE无限制权限策略文件
原因：如果密钥大于128位，会抛出java.security.InvalidKeyException: Illegal key size异常。因为密钥长度是受限制的，java运行时环境读到的是受限的policy文件。文件位于${java_home}/jre/lib/security，这种限制是因为美国对软件出口的控制。
替换：去官方下载JCE无限制权限策略文件，下载地址 JDK 5、JDK 6、JDK 7、JDK 8。
下载后解压，可以看到local_policy.jar和US_export_policy.jar以及readme.txt
如果安装了JRE，将两个jar文件放到%JRE_HOME%\lib\security目录下覆盖原来的文件
如果安装了JDK，还要将两个jar文件也放到%JDK_HOME%\jre\lib\security目录下覆盖原来文件。
参考：这里

Given final block not properly padded

异常：javax.crypto.BadPaddingException: Given final block not properly padded
错误代码：

private Key initKeyForAES(String key) throws NoSuchAlgorithmException {
    if (null == key || key.length() == 0) {
        throw new NullPointerException("key not is null");
    }
    SecretKeySpec key2 = null;
    try {
        KeyGenerator kgen = KeyGenerator.getInstance("AES");
        kgen.init(128, new SecureRandom(key.getBytes()));
        SecretKey secretKey = kgen.generateKey();
        byte[] enCodeFormat = secretKey.getEncoded();
        key2 = new SecretKeySpec(enCodeFormat, "AES");
    } catch (NoSuchAlgorithmException ex) {
        throw new NoSuchAlgorithmException();
    }
    return key2;

}

问题修复：

private Key initKeyForAES(String key) throws NoSuchAlgorithmException {
    if (null == key || key.length() == 0) {
        throw new NullPointerException("key not is null");
    }
    SecretKeySpec key2 = null;
    SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
    random.setSeed(key.getBytes());
    try {
        KeyGenerator kgen = KeyGenerator.getInstance("AES");
        kgen.init(128, random);
        SecretKey secretKey = kgen.generateKey();
        byte[] enCodeFormat = secretKey.getEncoded();
        key2 = new SecretKeySpec(enCodeFormat, "AES");
    } catch (NoSuchAlgorithmException ex) {
        throw new NoSuchAlgorithmException();
    }
    return key2;

}

解决：
即，将

new SecureRandom(key.getBytes())

替换为

SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
random.setSeed(key.getBytes());

参考：这里

Stream closed before a reply was received

分析发现是客户防火墙配置导致的网络时断时续的原因

img

java.io.IOException: Stream closed before a reply was received
        at com.turo.pushy.apns.ApnsClientHandler.<clinit>(ApnsClientHandler.java:80)
        at com.turo.pushy.apns.ApnsClientHandler$ApnsClientHandlerBuilder.build(ApnsClientHandler.java:136)
        at com.turo.pushy.apns.ApnsClientHandler$ApnsClientHandlerBuilder.build(ApnsClientHandler.java:89)