Question

以下代码抛出此错误消息：

Exception in thread "main" java.security.InvalidKeyException: Illegal key size or default parameters

Cipher dcipher;

byte[] salt = new String("12345678").getBytes();
int iterationCount = 1024;
int keyStrength = 256;
SecretKey key;
byte[] iv;

Decrypter(String passPhrase) throws Exception {
    SecretKeyFactory factory = SecretKeyFactory
            .getInstance("PBKDF2WithHmacSHA1");
    System.out.println("factory +" + factory);
    KeySpec spec = new PBEKeySpec(passPhrase.toCharArray(), salt,
            iterationCount, keyStrength);
    System.out.println("spec  " + spec);
    SecretKey tmp = factory.generateSecret(spec);
    System.out.println();
    key = new SecretKeySpec(tmp.getEncoded(), "AES");
    dcipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
}

public String encrypt(String data) throws Exception {
    dcipher.init(Cipher.ENCRYPT_MODE, key);
    AlgorithmParameters params = dcipher.getParameters();
    iv = params.getParameterSpec(IvParameterSpec.class).getIV();
    byte[] utf8EncryptedData = dcipher.doFinal(data.getBytes());
    String base64EncryptedData = new sun.misc.BASE64Encoder()
            .encodeBuffer(utf8EncryptedData);

    System.out.println("IV "
            + new sun.misc.BASE64Encoder().encodeBuffer(iv));
    System.out.println("Encrypted Data " + base64EncryptedData);
    return base64EncryptedData;

有人知道我为什么会收到这个错误吗？

Answer 1

可能您尚未安装JCE策略文件。

下载此文件：

并在${java.home}/jre/lib/security/.

中安装该文件

${java.home}指的是Java的安装目录

for mac：

open finder
按命令 + shift + g
输入/Library/Java/JavaVirtualMachines
导航至您的JDK版本
然后Contents/Home/jre/lib/security
解压缩下载的文件并将所有文件放在此处

用于CLI

unzip downloaded_policy_file.zip  -d /Library/Java/JavaVirtualMachines/<JDK_VERSION>/Contents/Home/jre/lib/security/

mv /Library/Java/JavaVirtualMachines/<JDK_VERSION>/Contents/Home/jre/lib/security/UnlimitedJCEPolicyJDK<VERSION>/* /Library/Java/JavaVirtualMachines/<JDK_VERSION>/Contents/Home/jre/lib/security  

rm -rf Library/Java/JavaVirtualMachines/<JDK_VERSION>/Contents/Home/jre/lib/security/UnlimitedJCEPolicyJDK<VERSION>/

Answer 2

从此链接下载JCE for Java 7 http://www.oracle.com/technetwork/java/javase/downloads/jce-7-download-432124.html

并打开路径C:\Program Files\Java\jdk1.7.0_80\jre\lib\security并在此处粘贴两个罐子。（即使两个罐子已经存在，也要替换这两个罐子）

Answer 3

对于JAVA 7，下载链接为jce-7-download

将两个下载的jar复制到Java \ jdk1.7.0_10 \ jre \ lib \ security中备份较旧的罐子以便更安全。

Answer 4

如果您使用带自制软件的Mac

add_filter('single_template', 'check_for_category_single_template');
    function check_for_category_single_template( $t ){
        foreach( (array) get_the_category() as $cat ){
            if ( file_exists(TEMPLATEPATH . "/single-category-{$cat->slug}.php") ) return TEMPLATEPATH . "/single-category-{$cat->slug}.php";
            if($cat->parent){
                $cat = get_the_category_by_ID( $cat->parent );
                if ( file_exists(TEMPLATEPATH . "/single-category-{$cat->slug}.php") ) return TEMPLATEPATH . "/single-category-{$cat->slug}.php";
            }
        }
        return $t;
    }

Answer 5

从JDK 1.8u151开始，没有必要单独下载JCE库。只需编辑：

$JDK_HOME/jre/lib/security/java.security

取消注释该行：

crypto.policy=unlimited

线程“main”中的异常java.security.InvalidKeyException：非法的键大小或默认参数

5 个答案: