/**
* Performs encryption operation.
*
* <p>The input plain text <code>in</code>, starting at <code>inOff</code> and ending at <code>
* (inOff + len - 1)</code>, is encrypted. The result is stored in <code>out</code>, starting at
* <code>outOfs</code>.
*
* @param in the buffer with the input data to be encrypted
* @param inOfs the offset in <code>in</code>
* @param len the length of the input data
* @param out the buffer for the result
* @param outOfs the offset in <code>out</code>
* @exception ProviderException if <code>len</code> is not a multiple of the block size
* @return the number of bytes placed into the <code>out</code> buffer
*/
int encrypt(byte[] in, int inOfs, int len, byte[] out, int outOfs) {
if ((len % blockSize) != 0) {
throw new ProviderException("Internal error in input buffering");
}
processAAD();
if (len > 0) {
gctrPAndC.update(in, inOfs, len, out, outOfs);
processed += len;
ghashAllToS.update(out, outOfs, len);
}
return len;
}
