QuasarApp/Qt-AES
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first try on OFB - not tested

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This commit is contained in:
Matteo Brichese 2018-04-03 17:42:03 -07:00
parent 6fc1d88485
commit 4ce12493f6
2 changed files with 17 additions and 4 deletions

14
qaesencryption.cpp

@ -398,13 +398,16 @@ QByteArray QAESEncryption::encode(const QByteArray &rawText, const QByteArray &k
QByteArray expandedKey = expandKey(key); QByteArray expandedKey = expandKey(key);
QByteArray alignedText(rawText); QByteArray alignedText(rawText);
QByteArray ivTemp(iv); QByteArray ivTemp(iv);
QByteArray ofbTemp;
//Fill array with padding //Fill array with padding
alignedText.append(getPadding(rawText.size(), m_blocklen)); alignedText.append(getPadding(rawText.size(), m_blocklen));
//Preparation for CFB //Preparation for CFB
if (m_mode == CFB) if (m_mode == CFB || m_mode == OFB)
ret.append(byteXor(alignedText.mid(0, m_blocklen), cipher(expandedKey, iv))); ret.append(byteXor(alignedText.mid(0, m_blocklen), cipher(expandedKey, iv)));
if (m_mode == OFB)
ofbTemp.append(cipher(expandedKey, iv));
//Looping thru all blocks //Looping thru all blocks
for(int i=0; i < alignedText.size(); i+= m_blocklen){ for(int i=0; i < alignedText.size(); i+= m_blocklen){
@ -423,6 +426,15 @@ QByteArray QAESEncryption::encode(const QByteArray &rawText, const QByteArray &k
ret.append(byteXor(alignedText.mid(i+m_blocklen, m_blocklen), ret.append(byteXor(alignedText.mid(i+m_blocklen, m_blocklen),
cipher(expandedKey, ret.mid(i, m_blocklen)))); cipher(expandedKey, ret.mid(i, m_blocklen))));
break; break;
case OFB:
if (i+m_blocklen < alignedText.size())
{
ret.append(byteXor(alignedText.mid(i+m_blocklen, m_blocklen),
cipher(expandedKey, ofbTemp.mid(i-m_blocklen, m_blocklen))));
ofbTemp.append(cipher(expandedKey, ofbTemp.mid(i-m_blocklen, m_blocklen)));
}
break;
default: default:
//do nothing //do nothing
break; break;

7
qaesencryption.h

@ -17,7 +17,8 @@ public:
enum Mode { enum Mode {
ECB, ECB,
CBC, CBC,
CFB CFB,
OFB
}; };
enum Padding { enum Padding {
@ -132,9 +133,9 @@ private:
// The round constant word array, Rcon[i], contains the values given by // The round constant word array, Rcon[i], contains the values given by
// x to th e power (i-1) being powers of x (x is denoted as {02}) in the field GF(2^8) // x to th e power (i-1) being powers of x (x is denoted as {02}) in the field GF(2^8)
//Only the first 14 elements are needed // Only the first 14 elements are needed
const quint8 Rcon[256] = { const quint8 Rcon[256] = {
0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, /*0x4d, 0x9a, 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab/*, 0x4d, 0x9a,
0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39, 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39,
0x72, 0xe4, 0xd3, 0xbd, 0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a, 0x72, 0xe4, 0xd3, 0xbd, 0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a,
0x74, 0xe8, 0xcb, 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0x74, 0xe8, 0xcb, 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8,