I am using AES 256 CBC. I have 32 bytes of IV. But when i run this it shows an exception as:
Exception in thread "main" java.lang.RuntimeException: java.security.InvalidAlgorithmParameterException: Wrong IV length: must be 16 bytes long
at com.abc.aes265cbc.AESUtil.decrypt(AESUtil.java:50)
at com.abc.aes265cbc.Security.main(Security.java:48)
Caused by: java.security.InvalidAlgorithmParameterException: Wrong IV length: must be 16 bytes long
at com.sun.crypto.provider.CipherCore.init(CipherCore.java:430)
at com.sun.crypto.provider.AESCipher.engineInit(AESCipher.java:217)
at javax.crypto.Cipher.implInit(Cipher.java:790)
at javax.crypto.Cipher.chooseProvider(Cipher.java:848)
at javax.crypto.Cipher.init(Cipher.java:1347)
at javax.crypto.Cipher.init(Cipher.java:1281)
at com.abc.aes265cbc.AESUtil.decrypt(AESUtil.java:47)
... 1 more
I don't know how to solve this. I searched but I am not getting how to solve this. I am trying security concepts for the first time. My code for the AES 256 CBC is:
public static void setENCRYPTION_IV(String ENCRYPTION_IV) {
AESUtil.ENCRYPTION_IV = ENCRYPTION_IV;
}
public static void setENCRYPTION_KEY(String ENCRYPTION_KEY) {
AESUtil.ENCRYPTION_KEY = ENCRYPTION_KEY;
}
public static String encrypt(String src) {
try {
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, makeKey(), makeIv());
return Base64.encodeBytes(cipher.doFinal(src.getBytes()));
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public static String decrypt(String src) {
String decrypted = "";
try {
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, makeKey(), makeIv());
decrypted = new String(cipher.doFinal(Base64.decode(src)));
} catch (Exception e) {
throw new RuntimeException(e);
}
return decrypted;
}
static AlgorithmParameterSpec makeIv() {
try {
return new IvParameterSpec(ENCRYPTION_IV.getBytes("UTF-8"));
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
return null;
}
static Key makeKey() {
try {
MessageDigest md = MessageDigest.getInstance("SHA-256");
byte[] key = md.digest(ENCRYPTION_KEY.getBytes("UTF-8"));
return new SecretKeySpec(key, "AES");
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
return null;
}
Can you help me that by changing what in this code i will be able to use 32 bytes of IV. Thanks in advance
Edit: My main function to which calls this functions:
AESUtil.setENCRYPTION_KEY("96161d7958c29a943a6537901ff0e913efaad15bd5e7c566f047412179504ffb");
AESUtil.setENCRYPTION_IV("d41361ed2399251f535e65f84a8f1c57");
String decrypted = AESUtil.decrypt(new String(sw0SrUIKe0DmS7sRd9+XMgtYg+BUiAfiOsdMw/Lo2RA=)); // AES Decrypt