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#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()
{
EVP_MD_CTX *ctx;
/* Create and initialise the context */
if (!(ctx = EVP_MD_CTX_create()))
{
handleOpenSslError();
}
/* Initialise the encryption operation. IMPORTANT - ensure you use a key
* and IV size appropriate for your cipher */
if (1 != EVP_DigestInit_ex(ctx, EVP_sha256(), NULL))
{
handleOpenSslError();
}
/* Provide the message to be encrypted, and obtain the encrypted output.
* EVP_EncryptUpdate can be called multiple times if necessary
*/
if (1 != EVP_DigestUpdate(ctx, m_key.data(), m_key.size()))
{
handleOpenSslError();
}
m_key = QByteArray(256, 0);
/* Finalise the encryption. Further ciphertext bytes may be written at
* this stage.
*/
if (1 != EVP_DigestFinal_ex(ctx, (unsigned char *) m_key.data(), NULL))
{
handleOpenSslError();
}
EVP_MD_CTX_destroy(ctx);
CryptClassEvp::encrypt();
}
void CryptAes::decrypt()
{
EVP_MD_CTX *ctx;
/* Create and initialise the context */
if (!(ctx = EVP_MD_CTX_create()))
{
handleOpenSslError();
}
/* Initialise the encryption operation. IMPORTANT - ensure you use a key
* and IV size appropriate for your cipher */
if (1 != EVP_DigestInit_ex(ctx, EVP_sha256(), NULL))
{
handleOpenSslError();
}
/* Provide the message to be encrypted, and obtain the encrypted output.
* EVP_EncryptUpdate can be called multiple times if necessary
*/
if (1 != EVP_DigestUpdate(ctx, m_key.data(), m_key.size()))
{
handleOpenSslError();
}
m_key = QByteArray(256, 0);
/* Finalise the encryption. Further ciphertext bytes may be written at
* this stage.
*/
if (1 != EVP_DigestFinal_ex(ctx, (unsigned char *) m_key.data(), NULL))
{
handleOpenSslError();
}
EVP_MD_CTX_destroy(ctx);
CryptClassEvp::decrypt();
}
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