public static void RC5_32_set_key(RC5_32_KEY key, int len, byte[] data,
int rounds)
{
int c2l_data_startIdx = 0;
ulong[] L = new ulong[64];
ulong l = 0, ll = 0, A = 0, B = 0, k = 0;
ulong[] S = null;
int i = 0, j = 0, m = 0, c = 0, t = 0, ii = 0, jj = 0;
if ((rounds != RC5_16_ROUNDS) &&
(rounds != RC5_12_ROUNDS) && (rounds != RC5_8_ROUNDS))
{
rounds = RC5_16_ROUNDS;
}
key.rounds = rounds;
S = key.data;
j = 0;
for (i = 0; i <= (len - 8); i += 8)
{
CryptUtil.c2l(data, ref l, ref c2l_data_startIdx);
L[j++] = l;
CryptUtil.c2l(data, ref l, ref c2l_data_startIdx);
L[j++] = l;
}
ii = len - i;
if (ii != 0)
{
k = (ulong)(len & 0x07);
CryptUtil.c2ln(data, ref l, ref ll, (long)k, ref c2l_data_startIdx);
L[j + 0] = l;
L[j + 1] = ll;
}
c = (len + 3) / 4;
t = (rounds + 1) * 2;
S[0] = RC5_32_P;
for (i = 1; i < t; i++)
{
S[i] = (S[i - 1] + RC5_32_Q) & RC5_32_MASK;
}
j = (t > c) ? t : c;
j *= 3;
ii = jj = 0;
A = B = 0;
for (i = 0; i < j; i++)
{
k = (S[ii] + A + B) & RC5_32_MASK;
A = S[ii] = ROTATE_l32(k, 3);
m = (int)(A + B);
k = (L[jj] + A + B) & RC5_32_MASK;
B = L[jj] = ROTATE_l32(k, (ulong)m);
if (++ii >= t)
{
ii = 0;
}
if (++jj >= c)
{
jj = 0;
}
}
}
public static void RC5_32_cbc_encrypt(byte[] inBytes, byte[] outBytes,
long length, RC5_32_KEY ks, byte[] iv,
int encrypt)
{
ulong tin0 = 0, tin1 = 0;
ulong tout0 = 0, tout1 = 0, xor0 = 0, xor1 = 0;
long l = length;
ulong[] tin = new ulong[2];
int c2l_iv_startIdx = 0;
int c2l_inBytes_startIdx = 0;
int l2c_outBytes_startIdx = 0;
int l2c_iv_startIdx = 0;
if (encrypt > 0)
{
CryptUtil.c2l(iv, ref tout0, ref c2l_iv_startIdx);
CryptUtil.c2l(iv, ref tout1, ref c2l_iv_startIdx);
c2l_iv_startIdx -= 8;
for (l -= 8; l >= 0; l -= 8)
{
CryptUtil.c2l(inBytes, ref tin0, ref c2l_inBytes_startIdx);
CryptUtil.c2l(inBytes, ref tin1, ref c2l_inBytes_startIdx);
tin0 ^= tout0;
tin1 ^= tout1;
tin[0] = tin0;
tin[1] = tin1;
RC5_32_encrypt(ref tin, ks);
tout0 = tin[0];
CryptUtil.l2c(tout0, outBytes, ref l2c_outBytes_startIdx);
tout1 = tin[1];
CryptUtil.l2c(tout1, outBytes, ref l2c_outBytes_startIdx);
}
if (l != -8)
{
CryptUtil.c2ln(inBytes, ref tin0, ref tin1, l + 8, ref c2l_inBytes_startIdx);
tin0 ^= tout0;
tin1 ^= tout1;
tin[0] = tin0;
tin[1] = tin1;
RC5_32_encrypt(ref tin, ks);
tout0 = tin[0];
CryptUtil.l2c(tout0, outBytes, ref l2c_outBytes_startIdx);
tout1 = tin[1];
CryptUtil.l2c(tout1, outBytes, ref l2c_outBytes_startIdx);
}
CryptUtil.l2c(tout0, iv, ref l2c_iv_startIdx);
CryptUtil.l2c(tout1, iv, ref l2c_iv_startIdx);
}
else
{
CryptUtil.c2l(iv, ref xor0, ref c2l_iv_startIdx);
CryptUtil.c2l(iv, ref xor1, ref c2l_iv_startIdx);
c2l_iv_startIdx -= 8;
for (l -= 8; l >= 0; l -= 8)
{
CryptUtil.c2l(inBytes, ref tin0, ref c2l_inBytes_startIdx);
tin[0] = tin0;
CryptUtil.c2l(inBytes, ref tin1, ref c2l_inBytes_startIdx);
tin[1] = tin1;
RC5_32_decrypt(ref tin, ks);
tout0 = tin[0] ^ xor0;
tout1 = tin[1] ^ xor1;
CryptUtil.l2c(tout0, outBytes, ref l2c_outBytes_startIdx);
CryptUtil.l2c(tout1, outBytes, ref l2c_outBytes_startIdx);
xor0 = tin0;
xor1 = tin1;
}
if (l != -8)
{
CryptUtil.c2l(inBytes, ref tin0, ref c2l_inBytes_startIdx);
tin[0] = tin0;
CryptUtil.c2l(inBytes, ref tin1, ref c2l_inBytes_startIdx);
tin[1] = tin1;
RC5_32_decrypt(ref tin, ks);
tout0 = tin[0] ^ xor0;
tout1 = tin[1] ^ xor1;
CryptUtil.l2cn(tout0, tout1, outBytes, l + 8, ref l2c_outBytes_startIdx);
xor0 = tin0;
xor1 = tin1;
}
CryptUtil.l2c(xor0, iv, ref l2c_iv_startIdx);
CryptUtil.l2c(xor1, iv, ref l2c_iv_startIdx);
}
tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
tin[0] = tin[1] = 0;
}