Qt-AES

// Encode of rawText with key
// iv is used in CBC mode
// return the encrypted byte array
QByteArray encode(const QByteArray rawText, const QByteArray key, const QByteArray iv = NULL);

// Decode of rawText with key
// iv is used in CBC mode
// return the decrypted byte array
QByteArray decode(const QByteArray rawText, const QByteArray key, const QByteArray iv = NULL);

// Key expansion in Rijndael schedule
// return the new expanded key as byte array
QByteArray expandKey(const QByteArray key);

QAESEncryption::Crypt => encode(...)
QAESEncryption::Decrypt => decode(...)
QAESEncryption::ExpandKey => expandKey(...)

#include "qaesencryption.h"

QAESEncryption encryption(QAESEncryption::AES_128, QAESEncryption::ECB);
QByteArray encodedText = encryption.encode(plainText, key);

QByteArray decodedText = encryption.decode(encodedText, key);

#include <QCryptographicHash>
#include "qaesencryption.h"

QAESEncryption encryption(QAESEncryption::AES_256, QAESEncryption::CBC);

QString inputStr("The Advanced Encryption Standard (AES), also known by its original name Rijndael "
                 "is a specification for the encryption of electronic data established by the U.S. "
                "National Institute of Standards and Technology (NIST) in 2001");
QString key("your-string-key");
QString iv("your-IV-vector");

QByteArray hashKey = QCryptographicHash::hash(key.toLocal8Bit(), QCryptographicHash::Sha256);
QByteArray hashIV = QCryptographicHash::hash(iv.toLocal8Bit(), QCryptographicHash::Md5);

QByteArray encodeText = encryption.encode(inputStr.toLocal8Bit(), hashKey, hashIV);
QByteArray decodeText = encryption.decode(encodeText, hashKey, hashIV);

QString decodedString = QString(encryption.removePadding(decodeText));

//decodedString == inputStr !!

#include <QCryptographicHash>
#include "qaesencryption.h"

QString inputStr("The Advanced Encryption Standard (AES), also known by its original name Rijndael "
                 "is a specification for the encryption of electronic data established by the U.S. "
                "National Institute of Standards and Technology (NIST) in 2001");
QString key("your-string-key");
QString iv("your-IV-vector");

QByteArray hashKey = QCryptographicHash::hash(key.toLocal8Bit(), QCryptographicHash::Sha256);
QByteArray hashIV = QCryptographicHash::hash(iv.toLocal8Bit(), QCryptographicHash::Md5);

//Static invocation
QByteArray encrypted = QAESEncryption::Crypt(QAESEncryption::AES_256, QAESEncryption::CBC, 
                        inputStr.toLocal8Bit(), hashKey, hashIV);
//...
// Removal of Padding via Static function
QString decodedString = QString(QAESEncryption::RemovePadding(decodeText));