/**
* blockmix_salsa8(B, Y, r):
* Compute B = BlockMix_{salsa20/8, r}(B). The input B must be 128r bytes in
* length; the temporary space Y must also be the same size.
*/
static void
blockmix_salsa8(uint32_t * B, uint32_t * Y, size_t r)
{
uint32_t X[16];
size_t i;
/* 1: X <-- B_{2r - 1} */
blkcpy(X, &B[(2 * r - 1) * 16], 16);
/* 2: for i = 0 to 2r - 1 do */
for (i = 0; i < 2 * r; i++) {
/* 3: X <-- H(X \xor B_i) */
blkxor(X, &B[i * 16], 16);
salsa20(X, 8);
/* 4: Y_i <-- X */
blkcpy(&Y[i * 16], X, 16);
}
/* 6: B' <-- (Y_0, Y_2 ... Y_{2r-2}, Y_1, Y_3 ... Y_{2r-1}) */
for (i = 0; i < r; i++)
blkcpy(&B[i * 16], &Y[(i * 2) * 16], 16);
for (i = 0; i < r; i++)
blkcpy(&B[(i + r) * 16], &Y[(i * 2 + 1) * 16], 16);
}
// Salsa expansion of key. Expansion of key depends from key length
static void
salsa_expand_key(struct salsa_context *ctx)
{
int i, j;
uint8_t *expand;
// Unique constant for key length 16 byte
uint8_t key_expand_16 [] = {
'e', 'x', 'p', 'a',
'n', 'd', ' ', '1',
'6', '-', 'b', 'y',
't', 'e', ' ', 'k'
};
// Unique constant for key length 32 byte
uint8_t key_expand_32 [] = {
'e', 'x', 'p', 'a',
'n', 'd', ' ', '3',
'2', '-', 'b', 'y',
't', 'e', ' ', 'k'
};
switch(ctx->keylen) {
case SALSA16 :
expand = (uint8_t *)key_expand_16;
break;
case SALSA32 :
expand = (uint8_t *)key_expand_32;
break;
}
j = 0;
for(i = 0; i < 64; i+=20) {
ctx->seq[i] = expand[j++];
ctx->seq[i + 1] = expand[j++];
ctx->seq[i + 2] = expand[j++];
ctx->seq[i + 3] = expand[j++];
}
for(i = 0; i < 16; i++) {
ctx->seq[4 + i] = ctx->key[i];
ctx->seq[24 + i] = ctx->nonce[i];
ctx->seq[44 + i] = ctx->key[ctx->keylen - 16 + i];
}
// Salsa hash function
salsa20(ctx->seq);
}
/*
* Set the Salsa IV
*/
void Salsa20::set_iv(const uint8_t iv[], size_t length)
{
if(!valid_iv_length(length))
throw Invalid_IV_Length(name(), length);
if(length == 0)
{
// Salsa20 null IV
m_state[6] = 0;
m_state[7] = 0;
}
else if(length == 8)
{
// Salsa20
m_state[6] = load_le<uint32_t>(iv, 0);
m_state[7] = load_le<uint32_t>(iv, 1);
}
else
{
// XSalsa20
m_state[6] = load_le<uint32_t>(iv, 0);
m_state[7] = load_le<uint32_t>(iv, 1);
m_state[8] = load_le<uint32_t>(iv, 2);
m_state[9] = load_le<uint32_t>(iv, 3);
secure_vector<uint32_t> hsalsa(8);
hsalsa20(hsalsa.data(), m_state.data());
m_state[ 1] = hsalsa[0];
m_state[ 2] = hsalsa[1];
m_state[ 3] = hsalsa[2];
m_state[ 4] = hsalsa[3];
m_state[ 6] = load_le<uint32_t>(iv, 4);
m_state[ 7] = load_le<uint32_t>(iv, 5);
m_state[11] = hsalsa[4];
m_state[12] = hsalsa[5];
m_state[13] = hsalsa[6];
m_state[14] = hsalsa[7];
}
m_state[8] = 0;
m_state[9] = 0;
salsa20(m_buffer.data(), m_state.data());
++m_state[8];
m_state[9] += (m_state[8] == 0);
m_position = 0;
}
/*
* Combine cipher stream with message
*/
void Salsa20::cipher(const uint8_t in[], uint8_t out[], size_t length)
{
while(length >= m_buffer.size() - m_position)
{
xor_buf(out, in, &m_buffer[m_position], m_buffer.size() - m_position);
length -= (m_buffer.size() - m_position);
in += (m_buffer.size() - m_position);
out += (m_buffer.size() - m_position);
salsa20(m_buffer.data(), m_state.data());
++m_state[8];
m_state[9] += (m_state[8] == 0);
m_position = 0;
}
xor_buf(out, in, &m_buffer[m_position], length);
m_position += length;
}
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
const char key[] = {
0x00, 0x09, 0x70, 0x03,
0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0a, 0x0b,
0x0c, 0x0d, 0x0e, 0x0f,
0x10, 0x11, 0x12, 0x13,
0x14, 0x15, 0x16, 0x17,
0x18, 0x19, 0x1a, 0x1b,
0x1c, 0x1d, 0x1e, 0x3f
};
const char in[] = {
0x00, 0x11, 0x11, 0x11,
0x13, 0x12, 0x12, 0x12,
0x88, 0x99, 0xaa, 0xbb,
0xcc, 0xdd, 0xee, 0xff,
0xdb, 0xdc, 0xdd, 0xde,
0x88, 0x99, 0xaa, 0xbb,
0xcc, 0xdd, 0xee, 0xff,
0x11, 0x12, 0x12, 0x12,
0x88, 0x99, 0xaa, 0xbb,
0xcc, 0xdd, 0xee, 0xff,
0x11, 0x12, 0x12, 0x12,
0x88, 0x99, 0xaa, 0xbb,
0xcc, 0xdd, 0xee, 0xff,
};
const char iv[] = {
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x88, 0x23, 0xaa, 0xbb,
0xcc, 0xdd, 0xee, 0xfc
};
QByteArray _key(key, 32);
QByteArray _in(in, 28);
QByteArray _iv(iv, 16);
AES aes(_key, _iv);
RC4 rc4(_key, _iv);
Salsa20 salsa20(_key, _iv);
qDebug() << "\nAES encryptor - CFB \n";
QByteArray encode_in = aes.update_CFB(_in, true);
qDebug() << "AES encode " << encode_in << " :size: " << encode_in.size();
QByteArray decode_in = aes.update_CFB(encode_in, false);
qDebug() << "RC4 decode " << decode_in << " :size: " << decode_in.size();
qDebug() << "\nRC4 encryptor \n";
QByteArray _encode_in = rc4.update(_in);
qDebug() << "RC4 encode " << _encode_in << " :size: " << _encode_in.size();
QByteArray _decode_in = rc4.update(_encode_in);
qDebug() << "RC4 decode " << _decode_in << " :size: " << _decode_in.size();
qDebug() << "\nSalsa20 encryptor \n";
QByteArray __encode_in = salsa20.update(_in);
qDebug() << "RC4 encode " << __encode_in << " :size: " << __encode_in.size();
QByteArray __decode_in = salsa20.update(__encode_in);
qDebug() << "RC4 decode " << __decode_in << " :size: " << __decode_in.size();
return a.exec();
}
