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@potados99
Last active January 1, 2024 13:27
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표준ㅋ암호화ㅋㅋㅎ
import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Base64;
class Scratch {
public static void main(String[] args) throws IOException {
String pathPrefix = "C:\\Users\\Administrator\\AppData\\Roaming\\Google\\AndroidStudio2023.1\\scratches";
String filename = "20240101-123사4567-X-10-1234678.TXT";
byte key = getKey(filename, Charset.forName("EUC-KR")); // 0x5A
System.out.printf("key: 0x%02X\n", key);
byte[] in = new String(Files.readAllBytes(Path.of(pathPrefix, "src.txt"))).replaceAll("\r\n", "").getBytes(Charset.forName("EUC-KR"));
byte[] out = encrypt(in, key);
Files.write(Path.of(pathPrefix, filename), out);
Files.write(Path.of(pathPrefix, "base64_" + filename), Base64.getEncoder().encode(out));
}
public static byte getKey(String password, Charset charset) {
int acc = 0;
byte[] bytes = password.getBytes(charset);
for (byte aByte : bytes) {
acc += aByte & 255;
}
byte key = (byte) (acc & 255);
if (key == 0) {
key = 1;
}
return key;
}
public static byte[] encrypt(byte[] var1, byte var2) {
return a(var1, var2);
}
public static byte[] decrypt(byte[] var1, byte var2) {
return a(var1, var2);
}
public static byte[] a(byte[] in, byte key) {
int len;
byte[] out = new byte[len = in.length];
for (int i = 0; i < len; ++i) {
out[i] = (byte) (in[i] ^ key);
}
return out;
}
}
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