QuasarApp/Qt-AES
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This commit is contained in:
Matteo Brichese 2017-07-07 14:10:45 -07:00
parent 8f569d3fcb
commit 15d10586cc
3 changed files with 84 additions and 91 deletions
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139
qaesencryption.cpp
View File

@ -1,6 +1,4 @@
#include "qaesencryption.h" #include "qaesencryption.h"
#include <QDebug>
/* /*
* Static Functions * Static Functions
@ -23,11 +21,29 @@ QByteArray QAESEncryption::ExpandKey(QAESEncryption::AES level, QAESEncryption::
* End Static function declarations * End Static function declarations
* */ * */
/* /*
* Constructor * Inline Functions
* */ * */
QAESEncryption::QAESEncryption(QAESEncryption::AES level, QAESEncryption::MODE mode) : m_nb(4), m_blocklen(16), m_level(level), m_mode(mode)
inline quint8 xTime(quint8 x){
return ((x<<1) ^ (((x>>7) & 1) * 0x1b));
}
inline quint8 multiply(quint8 x, quint8 y){
return (((y & 1) * x) ^ ((y>>1 & 1) * xTime(x)) ^ ((y>>2 & 1) * xTime(xTime(x))) ^ ((y>>3 & 1)
* xTime(xTime(xTime(x)))) ^ ((y>>4 & 1) * xTime(xTime(xTime(xTime(x))))));
}
inline int getPadding(int currSize, int alignment) {
return (alignment - currSize % alignment) % alignment;
}
/*
* End Inline functions
* */
QAESEncryption::QAESEncryption(QAESEncryption::AES level, QAESEncryption::MODE mode)
: m_nb(4), m_blocklen(16), m_level(level), m_mode(mode)
{ {
m_state = NULL; m_state = NULL;
@ -63,7 +79,6 @@ QAESEncryption::QAESEncryption(QAESEncryption::AES level, QAESEncryption::MODE m
m_keyLen = aes.keylen; m_keyLen = aes.keylen;
m_nr = aes.nr; m_nr = aes.nr;
m_expandedKey = aes.expandedKey; m_expandedKey = aes.expandedKey;
qDebug() << "Defaulting to AES128";
} }
break; break;
} }
@ -83,49 +98,38 @@ QByteArray QAESEncryption::expandKey(const QByteArray key)
//i == Nk //i == Nk
for(i = m_nk; i < m_nb * (m_nr + 1); i++) for(i = m_nk; i < m_nb * (m_nr + 1); i++)
{ {
{ tempa[0] = (quint8) roundKey.at((i-1) * 4 + 0);
tempa[0] = (quint8) roundKey.at((i-1) * 4 + 0); tempa[1] = (quint8) roundKey.at((i-1) * 4 + 1);
tempa[1] = (quint8) roundKey.at((i-1) * 4 + 1); tempa[2] = (quint8) roundKey.at((i-1) * 4 + 2);
tempa[2] = (quint8) roundKey.at((i-1) * 4 + 2); tempa[3] = (quint8) roundKey.at((i-1) * 4 + 3);
tempa[3] = (quint8) roundKey.at((i-1) * 4 + 3);
}
if (i % m_nk == 0) if (i % m_nk == 0)
{ {
// This function shifts the 4 bytes in a word to the left once. // This function shifts the 4 bytes in a word to the left once.
// [a0,a1,a2,a3] becomes [a1,a2,a3,a0] // [a0,a1,a2,a3] becomes [a1,a2,a3,a0]
// Function RotWord() // Function RotWord()
{
k = tempa[0]; k = tempa[0];
tempa[0] = tempa[1]; tempa[0] = tempa[1];
tempa[1] = tempa[2]; tempa[1] = tempa[2];
tempa[2] = tempa[3]; tempa[2] = tempa[3];
tempa[3] = k; tempa[3] = k;
}
// SubWord() is a function that takes a four-byte input word and // Function Subword()
// applies the S-box to each of the four bytes to produce an output word.
// Function Subword()
{
tempa[0] = getSBoxValue(tempa[0]); tempa[0] = getSBoxValue(tempa[0]);
tempa[1] = getSBoxValue(tempa[1]); tempa[1] = getSBoxValue(tempa[1]);
tempa[2] = getSBoxValue(tempa[2]); tempa[2] = getSBoxValue(tempa[2]);
tempa[3] = getSBoxValue(tempa[3]); tempa[3] = getSBoxValue(tempa[3]);
}
tempa[0] = tempa[0] ^ Rcon[i/m_nk]; tempa[0] = tempa[0] ^ Rcon[i/m_nk];
} }
if (m_level == AES_256 && i % m_nk == 4) if (m_level == AES_256 && i % m_nk == 4)
{ {
// Function Subword() // Function Subword()
{
tempa[0] = getSBoxValue(tempa[0]); tempa[0] = getSBoxValue(tempa[0]);
tempa[1] = getSBoxValue(tempa[1]); tempa[1] = getSBoxValue(tempa[1]);
tempa[2] = getSBoxValue(tempa[2]); tempa[2] = getSBoxValue(tempa[2]);
tempa[3] = getSBoxValue(tempa[3]); tempa[3] = getSBoxValue(tempa[3]);
}
} }
roundKey.insert(i * 4 + 0, (quint8) roundKey.at((i - m_nk) * 4 + 0) ^ tempa[0]); roundKey.insert(i * 4 + 0, (quint8) roundKey.at((i - m_nk) * 4 + 0) ^ tempa[0]);
roundKey.insert(i * 4 + 1, (quint8) roundKey.at((i - m_nk) * 4 + 1) ^ tempa[1]); roundKey.insert(i * 4 + 1, (quint8) roundKey.at((i - m_nk) * 4 + 1) ^ tempa[1]);
@ -140,9 +144,8 @@ QByteArray QAESEncryption::expandKey(const QByteArray key)
void QAESEncryption::addRoundKey(const quint8 round, const QByteArray expKey) void QAESEncryption::addRoundKey(const quint8 round, const QByteArray expKey)
{ {
QByteArray::iterator it = m_state->begin(); QByteArray::iterator it = m_state->begin();
for(int i=0; i < 16; ++i) { for(int i=0; i < 16; ++i)
it[i] = (quint8) it[i] ^ (quint8) expKey.at(round * m_nb * 4 + (i/4) * m_nb + (i%4)); it[i] = (quint8) it[i] ^ (quint8) expKey.at(round * m_nb * 4 + (i/4) * m_nb + (i%4));
}
} }
// The SubBytes Function Substitutes the values in the // The SubBytes Function Substitutes the values in the
@ -164,26 +167,26 @@ void QAESEncryption::shiftRows()
//Keep in mind that QByteArray is column-driven!! //Keep in mind that QByteArray is column-driven!!
//Shift 1 to left //Shift 1 to left
temp = (quint8)it[1]; temp = (quint8)it[1];
it[1] = (quint8)it[5]; it[1] = (quint8)it[5];
it[5] = (quint8)it[9]; it[5] = (quint8)it[9];
it[9] = (quint8)it[13]; it[9] = (quint8)it[13];
it[13] = (quint8)temp; it[13] = (quint8)temp;
//Shift 2 to left //Shift 2 to left
temp = (quint8)it[2]; temp = (quint8)it[2];
it[2] = (quint8)it[10]; it[2] = (quint8)it[10];
it[10] = (quint8)temp; it[10] = (quint8)temp;
temp = (quint8)it[6]; temp = (quint8)it[6];
it[6] = (quint8)it[14]; it[6] = (quint8)it[14];
it[14] = (quint8)temp; it[14] = (quint8)temp;
//Shift 3 to left //Shift 3 to left
temp = (quint8)it[3]; temp = (quint8)it[3];
it[3] = (quint8)it[15]; it[3] = (quint8)it[15];
it[15] = (quint8)it[11]; it[15] = (quint8)it[11];
it[11] = (quint8)it[7]; it[11] = (quint8)it[7];
it[7] = (quint8)temp; it[7] = (quint8)temp;
} }
// MixColumns function mixes the columns of the state matrix // MixColumns function mixes the columns of the state matrix
@ -193,21 +196,20 @@ void QAESEncryption::mixColumns()
QByteArray::iterator it = m_state->begin(); QByteArray::iterator it = m_state->begin();
quint8 tmp, tm, t; quint8 tmp, tm, t;
for(int i = 0; i < 16; i += 4) for(int i = 0; i < 16; i += 4){
{ t = (quint8)it[i];
t = (quint8)it[i]; tmp = (quint8)it[i] ^ (quint8)it[i+1] ^ (quint8)it[i+2] ^ (quint8)it[i+3] ;
tmp = (quint8)it[i] ^ (quint8)it[i+1] ^ (quint8)it[i+2] ^ (quint8)it[i+3] ;
tm = xTime( (quint8)it[i] ^ (quint8)it[i+1] ); tm = xTime( (quint8)it[i] ^ (quint8)it[i+1] );
it[i] = (quint8)it[i] ^ (quint8)tm ^ (quint8)tmp; it[i] = (quint8)it[i] ^ (quint8)tm ^ (quint8)tmp;
tm = xTime( (quint8)it[i+1] ^ (quint8)it[i+2]); tm = xTime( (quint8)it[i+1] ^ (quint8)it[i+2]);
it[i+1] = (quint8)it[i+1] ^ (quint8)tm ^ (quint8)tmp; it[i+1] = (quint8)it[i+1] ^ (quint8)tm ^ (quint8)tmp;
tm = xTime( (quint8)it[i+2] ^ (quint8)it[i+3]); tm = xTime( (quint8)it[i+2] ^ (quint8)it[i+3]);
it[i+2] =(quint8)it[i+2] ^ (quint8)tm ^ (quint8)tmp; it[i+2] =(quint8)it[i+2] ^ (quint8)tm ^ (quint8)tmp;
tm = xTime((quint8)it[i+3] ^ (quint8)t); tm = xTime((quint8)it[i+3] ^ (quint8)t);
it[i+3] =(quint8)it[i+3] ^ (quint8)tm ^ (quint8)tmp; it[i+3] =(quint8)it[i+3] ^ (quint8)tm ^ (quint8)tmp;
} }
} }
@ -219,8 +221,7 @@ void QAESEncryption::invMixColumns()
{ {
QByteArray::iterator it = m_state->begin(); QByteArray::iterator it = m_state->begin();
quint8 a,b,c,d; quint8 a,b,c,d;
for(int i = 0; i < 16; i+=4) for(int i = 0; i < 16; i+=4){
{
a = (quint8) it[i]; a = (quint8) it[i];
b = (quint8) it[i+1]; b = (quint8) it[i+1];
c = (quint8) it[i+2]; c = (quint8) it[i+2];
@ -250,25 +251,25 @@ void QAESEncryption::invShiftRows()
//Keep in mind that QByteArray is column-driven!! //Keep in mind that QByteArray is column-driven!!
//Shift 1 to right //Shift 1 to right
temp = (quint8)it[13]; temp = (quint8)it[13];
it[13] = (quint8)it[9]; it[13] = (quint8)it[9];
it[9] = (quint8)it[5]; it[9] = (quint8)it[5];
it[5] = (quint8)it[1]; it[5] = (quint8)it[1];
it[1] = (quint8)temp; it[1] = (quint8)temp;
//Shift 2 //Shift 2
temp = (quint8)it[10]; temp = (quint8)it[10];
it[10] = (quint8)it[2]; it[10] = (quint8)it[2];
it[2] = (quint8)temp; it[2] = (quint8)temp;
temp = (quint8)it[14]; temp = (quint8)it[14];
it[14] = (quint8)it[6]; it[14] = (quint8)it[6];
it[6] = (quint8)temp; it[6] = (quint8)temp;
//Shift 3 //Shift 3
temp = (quint8)it[15]; temp = (quint8)it[15];
it[15] = (quint8)it[3]; it[15] = (quint8)it[3];
it[3] = (quint8)it[7]; it[3] = (quint8)it[7];
it[7] = (quint8)it[11]; it[7] = (quint8)it[11];
it[11] = (quint8)temp; it[11] = (quint8)temp;
} }
@ -298,8 +299,7 @@ QByteArray QAESEncryption::cipher(const QByteArray expKey, const QByteArray in)
// There will be Nr rounds. // There will be Nr rounds.
// The first Nr-1 rounds are identical. // The first Nr-1 rounds are identical.
// These Nr-1 rounds are executed in the loop below. // These Nr-1 rounds are executed in the loop below.
for(quint8 round = 1; round < m_nr; ++round) for(quint8 round = 1; round < m_nr; ++round){
{
subBytes(); subBytes();
shiftRows(); shiftRows();
mixColumns(); mixColumns();
@ -327,8 +327,7 @@ QByteArray QAESEncryption::invCipher(const QByteArray expKey, const QByteArray i
// There will be Nr rounds. // There will be Nr rounds.
// The first Nr-1 rounds are identical. // The first Nr-1 rounds are identical.
// These Nr-1 rounds are executed in the loop below. // These Nr-1 rounds are executed in the loop below.
for(quint8 round=m_nr-1; round>0 ; round--) for(quint8 round=m_nr-1; round>0 ; round--){
{
invShiftRows(); invShiftRows();
invSubBytes(); invSubBytes();
addRoundKey(round, expKey); addRoundKey(round, expKey);
@ -357,8 +356,7 @@ QByteArray QAESEncryption::encode(const QByteArray rawText, const QByteArray key
alignedText.append(getPadding(rawText.size(), m_blocklen), 0); //filling the array with zeros alignedText.append(getPadding(rawText.size(), m_blocklen), 0); //filling the array with zeros
for(int i=0; i < alignedText.size(); i+= m_blocklen) for(int i=0; i < alignedText.size(); i+= m_blocklen){
{
if (m_mode == CBC) if (m_mode == CBC)
alignedText.replace(i, m_blocklen, ivXor(alignedText.mid(i, m_blocklen),ivTemp)); alignedText.replace(i, m_blocklen, ivXor(alignedText.mid(i, m_blocklen),ivTemp));
@ -367,7 +365,6 @@ QByteArray QAESEncryption::encode(const QByteArray rawText, const QByteArray key
if (m_mode == CBC) if (m_mode == CBC)
ivTemp = ret.mid(i, m_blocklen); ivTemp = ret.mid(i, m_blocklen);
} }
return ret; return ret;
} }
@ -381,8 +378,7 @@ QByteArray QAESEncryption::decode(const QByteArray rawText, const QByteArray key
QByteArray alignedText(rawText); QByteArray alignedText(rawText);
QByteArray ivTemp(iv); QByteArray ivTemp(iv);
for(int i=0; i < alignedText.size(); i+= m_blocklen) for(int i=0; i < alignedText.size(); i+= m_blocklen){
{
ret.append(invCipher(expandedKey, alignedText.mid(i, m_blocklen))); ret.append(invCipher(expandedKey, alignedText.mid(i, m_blocklen)));
if (m_mode == CBC) { if (m_mode == CBC) {
@ -390,6 +386,5 @@ QByteArray QAESEncryption::decode(const QByteArray rawText, const QByteArray key
ivTemp = alignedText.mid(i, m_blocklen); ivTemp = alignedText.mid(i, m_blocklen);
} }
} }
return ret; return ret;
} }

24
qaesencryption.h
View File

@ -34,12 +34,16 @@ signals:
public slots: public slots:
private: private:
//typedef uint8_t state[4][4]; int m_nb;
int m_blocklen;
int m_nb, m_blocklen, m_level, m_mode; int m_level;
int m_mode;
QByteArray* m_state; QByteArray* m_state;
int m_nk, m_keyLen, m_nr, m_expandedKey; int m_nk;
int m_keyLen;
int m_nr;
int m_expandedKey;
typedef struct{ typedef struct{
int nk = 8; int nk = 8;
@ -132,18 +136,6 @@ private:
0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63, 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, 0x72, 0xe4, 0xd3, 0xbd, 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, 0x74, 0xe8, 0xcb, 0x8d }; 0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a, 0x74, 0xe8, 0xcb, 0x8d };
inline quint8 xTime(quint8 x){
return ((x<<1) ^ (((x>>7) & 1) * 0x1b));
}
inline quint8 multiply(quint8 x, quint8 y){
return (((y & 1) * x) ^ ((y>>1 & 1) * xTime(x)) ^ ((y>>2 & 1) * xTime(xTime(x))) ^ ((y>>3 & 1) * xTime(xTime(xTime(x)))) ^ ((y>>4 & 1) * xTime(xTime(xTime(xTime(x))))));
}
inline int getPadding(int currSize, int alignment) {
return (alignment - currSize % alignment) % alignment;
}
}; };
#endif // QAESENCRYPTION_H #endif // QAESENCRYPTION_H

12
unit_test/aestest.h
View File

@ -28,10 +28,16 @@ private slots:
void cleanupTestCase(){} void cleanupTestCase(){}
private: private:
QByteArray key16, key24, key32; QByteArray key16;
QByteArray key24;
QByteArray key32;
QByteArray iv; QByteArray iv;
QByteArray in, outECB128, outECB192, outECB256; QByteArray in;
QByteArray inCBC128, outCBC128; QByteArray outECB128;
QByteArray outECB192;
QByteArray outECB256;
QByteArray inCBC128;
QByteArray outCBC128;
}; };
#endif // AESTEST_H #endif // AESTEST_H