Add Crypt/Decrypt programm to repo

2026-01-19 04:28:08 +00:00 · 2018-07-18 13:48:19 +02:00 · 2018-07-18 13:48:19 +02:00 · 50670a4223
commit 50670a4223
parent a6ae825ef1
1 changed files with 100 additions and 0 deletions
--- a/chiffrement/chiffrement.java
+++ b/chiffrement/chiffrement.java
@ -0,0 +1,100 @@
+import java.io.BufferedWriter;
+import java.io.ByteArrayInputStream;
+import java.io.File;
+import java.math.BigInteger;
+import java.nio.charset.Charset;
+import java.nio.file.Files;
+import java.security.spec.KeySpec;
+import java.util.Base64;
+
+import javax.crypto.Cipher;
+import javax.crypto.SecretKey;
+import javax.crypto.SecretKeyFactory;
+import javax.crypto.spec.IvParameterSpec;
+import javax.crypto.spec.PBEKeySpec;
+import javax.crypto.spec.SecretKeySpec;
+
+public class chiffrement {
+
+	static byte[] removeUselessByte(byte[] tab, int wantedSize) {
+		if (wantedSize == tab.length) return tab;
+		byte[] newTab = new byte[wantedSize];
+		for (int i = 1 ; i < tab.length ; i++) {
+			newTab[i-1] = tab[i];
+		}
+		return newTab;
+	}
+
+	public static void main(String[] args) {
+		if (args.length >= 4) {
+			String encrypted;
+			String crypt = args[0];
+			String password = args[1];
+			String content = args[2];
+			String outputName = args[3];
+			System.out.println((crypt.compareTo("0") == 0) ? "Decrypt\n" : "Crypt\n" + "Password: " + password + "\nContent: " + content + "\nOutput File: " + outputName);
+			File output = new File(outputName);
+
+			if (crypt.compareTo("0") == 0) {
+				try {
+					byte[] unBased64Data = content.getBytes();
+					ByteArrayInputStream inputStream = new ByteArrayInputStream(unBased64Data);
+
+					byte[] contentToDecrypt = new byte[unBased64Data.length];
+
+					inputStream.read(contentToDecrypt);
+
+					BigInteger saltHex = new BigInteger("F000000000000000", 16);
+					BigInteger ivHex = new BigInteger("F58B8C9A49B321DBA000000000000000", 16);
+
+					byte[] saltByte = removeUselessByte(saltHex.toByteArray(), 8);
+					byte[] ivByte = removeUselessByte(ivHex.toByteArray(), 16);
+
+					SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256");
+					KeySpec keySpec = new PBEKeySpec(password.toCharArray(), saltByte, 10000, 128);
+					SecretKey tmpSecretKey = factory.generateSecret(keySpec);
+					SecretKeySpec secretKeySpec = new SecretKeySpec(tmpSecretKey.getEncoded(), "AES");
+
+					Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
+					cipher.init(Cipher.DECRYPT_MODE, secretKeySpec, new IvParameterSpec(ivByte));
+
+					encrypted = new String(cipher.doFinal(Base64.getDecoder().decode(contentToDecrypt)));
+				} catch (Exception ex) {
+					System.out.println(ex);
+					return;
+				}
+			} else {
+				try {
+					BigInteger saltHex = new BigInteger("F000000000000000", 16);
+					BigInteger ivHex = new BigInteger("F58B8C9A49B321DBA000000000000000", 16);
+
+					byte[] salt = removeUselessByte(saltHex.toByteArray(), 8);
+					byte[] iv = removeUselessByte(ivHex.toByteArray(), 16);
+
+					SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256");
+					KeySpec spec = new PBEKeySpec(password.toCharArray(), salt, 10000, 128);
+					SecretKey tmp = factory.generateSecret(spec);
+					SecretKeySpec secretKey = new SecretKeySpec(tmp.getEncoded(), "AES");
+					IvParameterSpec ivspec = new IvParameterSpec(iv);
+
+					Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
+					cipher.init(Cipher.ENCRYPT_MODE, secretKey, ivspec);
+					byte[] encryptedBytes = cipher.doFinal(content.getBytes(Charset.forName("UTF-8")));
+
+					encrypted = new String(Base64.getEncoder().encode(encryptedBytes));
+
+				} catch (Exception ex) {
+					System.out.println(ex);
+					return;
+				}
+			}
+			try {
+				BufferedWriter writer = Files.newBufferedWriter(output.toPath(), Charset.forName("UTF-8"));
+				writer.write(encrypted + "\0", 0, encrypted.length());
+				writer.close();
+			} catch (Exception ex) {
+				System.out.println(ex);
+			}
+		}
+	}
+}