Hallo
Pls can anyone Help me. I need this in C++ (QT5) but i can find the Answer
in the Wiki or by Google
I*m frustrated while i can't do this the correct way.
lg Chris
// hashValue = "033add0a7d42df9265d52d689c8be3be";
// symetricKey =
"02fa45c886a79c4c06b6493031051ef8839166da576935d4cbf74b96dd8b5bea"
ByteBuffer byteBufferIV = ByteBuffer.allocate(16);
byteBufferIV.put(hashValue);
byte[] IV = byteBufferIV.array();
// bytes 0-7 are used for the counter, which is represented by
// 8-byte
// two-complement, Big Endian representation (equal to Java LONG),
bytes
// 8-15 are set to 0
// negative values are possible (very rare)
ByteBuffer byteBufferData = ByteBuffer.allocate(16);
byteBufferData.putLong(longValue);
byte[] data = byteBufferData.array();
// prepare AES cipher with CTR/ICM mode, NoPadding is essential for
the
// decryption process. Padding could not be reconstructed due
// to storing only 8 bytes of the cipher text (not the full 16
bytes)
// (or 5 bytes if the mininum length is used)
IvParameterSpec ivSpec = new IvParameterSpec(IV);
// TODO provider independent
Cipher cipher = Cipher.getInstance("AES/CTR/NoPadding", "BC");
cipher.init(Cipher.ENCRYPT_MODE, symmetricKey, ivSpec);
// encrypt the value with the prepared cipher
byte[] encryptedValueComplete = cipher.doFinal(data);
// extract bytes that will be stored in the receipt (only bytes 0-7)
// cryptographic NOTE: this is only possible due to the use of the
CTR
// mode, would not work for ECB/CBC etc. modes
byte[] encryptedValue = new byte[8]; // or 5 bytes if min.
// length is
// used
System.arraycopy(encryptedValueComplete, 0, encryptedValue, 0,
encryptedValue.length);
System.out.println(encryptedValue);
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