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[英]AES/GCM/NoPadding encryption in JAVA & decryption in JavaScript
[英]Java AES/GCM/NoPadding encryption fails with special characters
我遵循了一些示例,并且在尝试实现此处引用的AES/GCM/NoPadding
时: https://www.strongauth.com/samplecode/GCM.java我无法加密任何包含特殊字符的文本(即ø
) .
最终它在 doFinal 内部失败并出现javax.crypto.ShortBufferException: Output buffer must be (at least) 30 bytes long
,但似乎我一定做错了什么。 我错过了什么?
简单的 POC:
public class Example {
private static final String CIPHER_TRANSFORM = "AES/GCM/NoPadding";
public static void main(String[] args) {
String key = generateKey("AES", 256, "seed");
encryptText("text containing a ø character", key, "TOKENTOKENTOKENTOKEN", "AES");
}
private static String generateKey(String alg, int size, String seed) {
try {
SecureRandom securerandom = SecureRandom.getInstance("SHA1PRNG");
securerandom.setSeed(seed.getBytes("UTF-8"));
KeyGenerator kg = KeyGenerator.getInstance(alg);
kg.init(size, securerandom);
SecretKey sk = kg.generateKey();
return new String(Base64.getEncoder().encode(sk.getEncoded()), "UTF-8");
}
catch (UnsupportedEncodingException | NoSuchAlgorithmException ex) {
System.err.println(ex);
}
return null;
}
private static String encryptText(String PLAINTEXT, String PLAINTEXTKEY, String TOKEN, String alg) {
try {
// Create SecretKey & Cipher
SecretKeySpec sks = new SecretKeySpec(Base64.getDecoder().decode(PLAINTEXTKEY), alg);
Cipher cipher = Cipher.getInstance(CIPHER_TRANSFORM);
// Setup byte arrays
byte[] input = PLAINTEXT.getBytes("UTF-8");
byte[] tkb = TOKEN.getBytes("UTF-8");
byte[] iv = new byte[12];
System.arraycopy(tkb, 4, iv, 0, 12);
cipher.init(Cipher.ENCRYPT_MODE, sks, new GCMParameterSpec(128, iv));
cipher.updateAAD(tkb);
byte[] opbytes = new byte[cipher.getOutputSize(PLAINTEXT.length())];
// Perform crypto
int ctlen = cipher.update(input, 0, input.length, opbytes);
ctlen += cipher.doFinal(opbytes, ctlen);
byte[] output = new byte[ctlen];
System.arraycopy(opbytes, 0, output, 0, ctlen);
return new String(Base64.getEncoder().encode(output), "UTF-8");
}
catch (InvalidAlgorithmParameterException | UnsupportedEncodingException |
IllegalBlockSizeException | BadPaddingException | InvalidKeyException |
NoSuchAlgorithmException | NoSuchPaddingException | ShortBufferException ex) {
System.err.println(ex);
}
return null;
}
}
你的问题是这一行:
byte[] opbytes = new byte[cipher.getOutputSize(PLAINTEXT.length())];
UTF-8 符文中的字符串长度并不总是与底层字节数组的长度相同。 您应该在这里使用input
的长度,而不是PLAINTEXT
。
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