static boost::shared_ptr<Cipher> NewAESCipher( const Interface &iface, int keyLen )
{
if( keyLen <= 0 )
keyLen = 192;
keyLen = AESKeyRange.closest( keyLen );
const EVP_CIPHER *blockCipher = 0;
const EVP_CIPHER *streamCipher = 0;
switch(keyLen)
{
case 128:
blockCipher = EVP_aes_128_cbc();
streamCipher = EVP_aes_128_cfb();
break;
case 192:
blockCipher = EVP_aes_192_cbc();
streamCipher = EVP_aes_192_cfb();
break;
case 256:
default:
blockCipher = EVP_aes_256_cbc();
streamCipher = EVP_aes_256_cfb();
break;
}
return boost::shared_ptr<Cipher>( new SSL_Cipher(iface, AESInterface,
blockCipher, streamCipher, keyLen / 8) );
}
static shared_ptr<Cipher> NewAesXtsCipher( const Interface &iface, int keyLen )
{
if( keyLen <= 0 )
keyLen = 256;
keyLen = AesXtsKeyRange.closest( keyLen );
const EVP_CIPHER *blockCipher = 0;
switch(keyLen)
{
case 128:
blockCipher = EVP_aes_128_xts();
break;
case 256:
default:
blockCipher = EVP_aes_256_xts();
break;
}
// XTS uses 2 keys, so the key size is doubled here.
// Eg XTS-AES-256 uses two 256 bit keys.
return shared_ptr<Cipher>( new SSL_Cipher(iface, AesXtsInterface,
blockCipher, NULL, 2 * keyLen / 8) );
}
static std::shared_ptr<Cipher> NewBFCipher(const Interface &iface, int keyLen) {
if (keyLen <= 0) keyLen = 160;
keyLen = BFKeyRange.closest(keyLen);
const EVP_CIPHER *blockCipher = EVP_bf_cbc();
const EVP_CIPHER *streamCipher = EVP_bf_cfb();
return std::shared_ptr<Cipher>(new SSL_Cipher(
iface, BlowfishInterface, blockCipher, streamCipher, keyLen / 8));
}