#include "cryptaes.h"

CryptAes::CryptAes()
    : CryptClassEvp()
{
    m_iv = QByteArray(16, 0);
}

const EVP_CIPHER *CryptAes::algorithm()
{
    switch (m_keyLength)
    {
    case 128:

        return EVP_aes_128_cbc();
        break;

    case 192:

        return EVP_aes_192_cbc();
        break;

    case 256:

        return EVP_aes_256_cbc();
        break;
    }

    return EVP_enc_null();
}


void CryptAes::encrypt()
{
    m_key = CryptEngine::createPasswordHash(m_key);

    m_iv = CryptEngine::createRandomIv(IVLENGTH);

    CryptClassEvp::encrypt();

    m_cryptText = m_iv + m_cryptText;
}

void CryptAes::decrypt()
{
    m_key = CryptEngine::createPasswordHash(m_key);

    m_iv = m_cryptText.left(IVLENGTH);

    m_cryptText = m_cryptText.remove(0, IVLENGTH);

    CryptClassEvp::decrypt();
}