Java AES 密钥长度无效：128 字节？
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Invalid AES key length: 128 bytes?
提问by vrwim
I am getting java.security.InvalidKeyException: Invalid AES key length: 128 byteson my line
我要java.security.InvalidKeyException: Invalid AES key length: 128 bytes上线了
CIPHER.init(Cipher.ENCRYPT_MODE, keySpec);
with CIPHER being
密码是
Cipher CIPHER = Cipher.getInstance("AES");
and keySpec
和 keySpec
SecretKeySpec keySpec = new SecretKeySpec(key, "AES");
that key is a byte[]of length 128 I got through a Diffie-Hellman key exchange (though it shouldn't matter where I got it, right?), keyis completely filled with nonzero bytes
该密钥是一个byte[]长度为 128 的密钥，我是通过 Diffie-Hellman 密钥交换获得的（尽管我从哪里得到它并不重要，对吧？），key完全充满了非零字节
Why is Cipher.init(...)complaining that the key is a wrong length? This webpageclearly states that a key of length 128 is supported.
为什么Cipher.init(...)抱怨密钥长度错误？该网页明确指出支持长度为 128 的密钥。
What am I overlooking?
我在看什么？
采纳答案by Konstantin V. Salikhov
I think you need 128 bit key here for AES algorithm - not 128 byte. To convert your long key to needed length you could try something like password-based key derivation function. See PBKDF2 for example.
我认为您需要 128 位密钥用于 AES 算法 - 而不是 128 字节。要将您的长密钥转换为所需的长度，您可以尝试类似基于密码的密钥派生功能。例如，请参见 PBKDF2。
回答by Khalid Habib
AES algorithm allows 128, 192 or 256 bit key length. which is 16, 24 or 32 byte. your keys length should be 16 , 24 or 32 bytes.
AES 算法允许 128、192 或 256 位密钥长度。这是 16、24 或 32 字节。您的密钥长度应为 16 、 24 或 32 字节。
