问题
I can see they are different than the bytes I created the string with! I have used "AES/CBC/PKCS5Padding" to get the string.
public static void main(String[] args) {
try {
int randomNumber = CNStationQueueUtil.randInt(0, 99999);
String key = "AES_KEY_TAKENUMB";
byte[] bytes = EncryptHelper.encrypt(key, String.format("%%%d%%%d", 1001, randomNumber));
String str = new String(bytes, "UTF8");
System.out.println("str = " + str);
System.out.println();
byte[] utf8Bytes = str.getBytes("UTF8");
printBytes(utf8Bytes, "utf8Bytes");
} catch (Exception e) {
e.printStackTrace();
}
}
public class EncryptHelper {
public static byte[] encrypt(String key, String value)
throws GeneralSecurityException {
byte[] raw = key.getBytes(Charset.forName("UTF-8"));
if (raw.length != 16) {
throw new IllegalArgumentException("Invalid key size.");
}
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, skeySpec,
new IvParameterSpec(new byte[16]));
return cipher.doFinal(value.getBytes(Charset.forName("UTF-8")));
}
public static String decrypt(String key, byte[] encrypted)
throws GeneralSecurityException {
byte[] raw = key.getBytes(Charset.forName("UTF-8"));
if (raw.length != 16) {
throw new IllegalArgumentException("Invalid key size.");
}
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, skeySpec,
new IvParameterSpec(new byte[16]));
byte[] original = cipher.doFinal(encrypted);
return new String(original, Charset.forName("UTF-8"));
}
}
回答1:
When you decode a string as UTF-8 it is because you encoded the bytes as UTF-8 or something compatible. You can't just take a byte[] of random bytes and turn it into a String because it is binary data not text.
What you can do is use a Base64 encoder for the binary and a Base64 decoder to turn it back into the original bytes.
A hacky way of doing this is to use ISO-8859-1, but this is a bad idea generally as you are confusing binary and text data.
来源：https://stackoverflow.com/questions/32069063/bytes-in-str-new-stringbytes-utf8-and-bytes-str-getbytesutf8-n