cipher key: 0123456789abcdef0123456789abcdef
IV: 0123456789ABCDEF
padding character: fs (ASCII=34 -> FILE SEPARATOR)
secret message: this information is confidential, for your eyes only
encrypted > K7aToyGnmyxFF+GHzMOsArYMibOqtWn3J9DxJGN2CczFIwc12/dAty4eV5tRtvPeLEC2cSiRtrtGBHuET8buSQ==
decrypted > this information is confidential, for your eyes only
SUCCESS
| import java.security.MessageDigest; | |
| import java.util.Arrays; | |
| import java.util.Base64; | |
| import java.nio.charset.StandardCharsets; | |
| import javax.crypto.KeyGenerator; | |
| import javax.crypto.SecretKey; | |
| import javax.crypto.spec.SecretKeySpec; | |
| import javax.crypto.spec.IvParameterSpec; | |
| import javax.crypto.Cipher; | |
| import javax.crypto.spec.IvParameterSpec; | |
| import javax.crypto.spec.SecretKeySpec; | |
| public class AES { | |
| static byte[] CIPHER_KEY = "0123456789abcdef0123456789abcdef".getBytes(StandardCharsets.UTF_8); | |
| static byte[] IV = "1234567890ABCDEF".getBytes(StandardCharsets.UTF_8); | |
| static char PADDING_CHAR = '\034'; | |
| public static String encrypt(String text) throws Exception { | |
| Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding", "SunJCE"); | |
| SecretKeySpec key = new SecretKeySpec(CIPHER_KEY, "AES"); | |
| cipher.init(Cipher.ENCRYPT_MODE, key, new IvParameterSpec(IV)); | |
| int paddingSize = 16 - text.length() % 16; | |
| String padding = String.format("%0" + paddingSize + "d", 0).replace('0', PADDING_CHAR); | |
| String padded = text + padding; | |
| byte[] encrypted = cipher.doFinal(padded.getBytes(StandardCharsets.UTF_8)); | |
| return Base64.getEncoder().encodeToString(encrypted); | |
| } | |
| public static String decrypt(String data) throws Exception { | |
| Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding", "SunJCE"); | |
| SecretKeySpec key = new SecretKeySpec(CIPHER_KEY, "AES"); | |
| cipher.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(IV)); | |
| byte[] encrypted = Base64.getDecoder().decode(data); | |
| String padded = new String(cipher.doFinal(encrypted), StandardCharsets.UTF_8); | |
| return padded.replaceAll(PADDING_CHAR + "+$", ""); | |
| } | |
| public static void main(String[] args) { | |
| try { | |
| String message = "this information is confidential, for your eyes only"; | |
| System.out.println("secret message: " + message); | |
| String encrypted_message = encrypt(message); | |
| System.out.println(" encrypted > " + encrypted_message); | |
| String decrypted_message = decrypt(encrypted_message); | |
| System.out.println(" decrypted > " + decrypted_message); | |
| if (message.equals(decrypted_message)) { | |
| System.out.println("SUCCESS"); | |
| } else { | |
| System.out.println("FAILED"); | |
| } | |
| } catch (Exception e) { | |
| e.printStackTrace(); | |
| } | |
| } | |
| } |
| <?php | |
| define('CIPHER_KEY', "0123456789abcdef0123456789abcdef"); | |
| define('IV', "1234567890ABCDEF"); | |
| define('PADDING_CHAR', "\034"); | |
| function encrypt($text) | |
| { | |
| $padded = $text . str_repeat(PADDING_CHAR, (16 - strlen($text) % 16)); | |
| return openssl_encrypt($padded, "AES-256-CBC", CIPHER_KEY, OPENSSL_ZERO_PADDING, IV); | |
| } | |
| function decrypt($data) | |
| { | |
| $padded = openssl_decrypt($data, "AES-256-CBC", CIPHER_KEY, OPENSSL_ZERO_PADDING, IV); | |
| return rtrim($padded, PADDING_CHAR); | |
| } | |
| $message = "this information is confidential, for your eyes only"; | |
| echo "secret message: " . $message . "\n"; | |
| $encrypted_message = encrypt($message); | |
| echo " encrypted > " . $encrypted_message . "\n"; | |
| $decrypted_message = decrypt($encrypted_message); | |
| echo " decrypted > " . $decrypted_message . "\n"; | |
| echo $message === $decrypted_message ? "SUCCESS" : "FAILED" . "\n"; | |
| ?> |
| # Dependencies: PyCrypto -> `pip install pycrypto` | |
| from base64 import b64decode, b64encode | |
| from Crypto.Cipher import AES | |
| CIPHER_KEY = "0123456789abcdef0123456789abcdef" | |
| IV = b"1234567890ABCDEF" | |
| PADDING_CHAR = b"\034" | |
| def encrypt(text): | |
| aes = AES.new(CIPHER_KEY, AES.MODE_CBC, IV) | |
| padded = text + PADDING_CHAR * (16 - len(text) % 16) | |
| encrypted = aes.encrypt(padded) | |
| return b64encode(encrypted) | |
| def decrypt(data): | |
| aes = AES.new(CIPHER_KEY, AES.MODE_CBC, IV) | |
| encrypted = b64decode(data) | |
| padded = aes.decrypt(encrypted) | |
| return padded.rstrip(PADDING_CHAR) | |
| message = "this information is confidential, for your eyes only" | |
| print("secret message: {}".format(message)) | |
| encrypted_message = encrypt(message) | |
| print(" encrypted > {}".format(encrypted_message)) | |
| decrypted_message = decrypt(encrypted_message) | |
| print(" decrypted > {}".format(decrypted_message)) | |
| if message == decrypted_message: | |
| print("SUCCESS") | |
| else: | |
| print("FAILED") |
Why does your Java example not work anymore if I modify the 'message' in line 41 to:
message = "this information is cönfidential, for your eyes only";
?