【小坑速记】JDK加解密Key长度限制

java.security.InvalidKeyException: Illegal key size
	at javax.crypto.Cipher.checkCryptoPerm(Cipher.java:1038)
	at javax.crypto.Cipher.implInit(Cipher.java:804)
	at javax.crypto.Cipher.chooseProvider(Cipher.java:863)
	at javax.crypto.Cipher.init(Cipher.java:1395)
	at javax.crypto.Cipher.init(Cipher.java:1326)

// local_policy.jar中内容
grant {
    permission javax.crypto.CryptoPermission "DES", 64;
    permission javax.crypto.CryptoPermission "DESede", *;
    permission javax.crypto.CryptoPermission "RC2", 128, 
                                     "javax.crypto.spec.RC2ParameterSpec", 128;
    permission javax.crypto.CryptoPermission "RC4", 128;
    permission javax.crypto.CryptoPermission "RC5", 128, 
          "javax.crypto.spec.RC5ParameterSpec", *, 12, *;
    permission javax.crypto.CryptoPermission "RSA", *;
    permission javax.crypto.CryptoPermission *, 128;
};

// US_export_policy.jar中内容
grant {
    // There is no restriction to any algorithms.
    permission javax.crypto.CryptoAllPermission; 
};

// US_export_policy.jar 和 local_policy.jar 都为以下内容
grant {
    // There is no restriction to any algorithms.
    permission javax.crypto.CryptoAllPermission; 
};