| private static RotateRight ( uint x, int bits ) : uint | ||
| x | uint | |
| bits | int | |
| Результат | uint | |
private void Init()
{
if (this.key.Length != 32 && this.key.Length != 16)
{
throw new ArgumentException("The key must be 128/256 bits long");
}
if (this.iv.Length < 16)
{
throw new ArgumentException("The IV must be at least 128 bits long");
}
if (this.key.Length != 32)
{
byte[] destinationArray = new byte[32];
Array.Copy(this.key, 0, destinationArray, 0, this.key.Length);
Array.Copy(this.key, 0, destinationArray, 16, this.key.Length);
this.key = destinationArray;
}
if (this.iv.Length < 32)
{
byte[] array = new byte[32];
Array.Copy(this.iv, 0, array, 0, this.iv.Length);
Array.Copy(this.iv, 0, array, this.iv.Length, array.Length - this.iv.Length);
this.iv = array;
}
this.cnt = 0u;
uint[] array2 = new uint[2560];
for (int i = 0; i < 32; i++)
{
array2[i >> 2] |= (uint)((uint)this.key[i] << 8 * (i & 3));
}
for (int j = 0; j < 32; j++)
{
array2[(j >> 2) + 8] |= (uint)((uint)this.iv[j] << 8 * (j & 3));
}
for (uint num = 16u; num < 2560u; num += 1u)
{
uint num2 = array2[(int)((UIntPtr)(num - 2u))];
uint num3 = array2[(int)((UIntPtr)(num - 15u))];
array2[(int)((UIntPtr)num)] = (HC256Engine.RotateRight(num2, 17) ^ HC256Engine.RotateRight(num2, 19) ^ num2 >> 10) + array2[(int)((UIntPtr)(num - 7u))] + (HC256Engine.RotateRight(num3, 7) ^ HC256Engine.RotateRight(num3, 18) ^ num3 >> 3) + array2[(int)((UIntPtr)(num - 16u))] + num;
}
Array.Copy(array2, 512, this.p, 0, 1024);
Array.Copy(array2, 1536, this.q, 0, 1024);
for (int k = 0; k < 4096; k++)
{
this.Step();
}
this.cnt = 0u;
}
private uint Step()
{
uint num = this.cnt & 1023u;
uint result;
if (this.cnt < 1024u)
{
uint num2 = this.p[(int)((UIntPtr)(num - 3u & 1023u))];
uint num3 = this.p[(int)((UIntPtr)(num - 1023u & 1023u))];
this.p[(int)((UIntPtr)num)] += this.p[(int)((UIntPtr)(num - 10u & 1023u))] + (HC256Engine.RotateRight(num2, 10) ^ HC256Engine.RotateRight(num3, 23)) + this.q[(int)((UIntPtr)((num2 ^ num3) & 1023u))];
num2 = this.p[(int)((UIntPtr)(num - 12u & 1023u))];
result = (this.q[(int)((UIntPtr)(num2 & 255u))] + this.q[(int)((UIntPtr)((num2 >> 8 & 255u) + 256u))] + this.q[(int)((UIntPtr)((num2 >> 16 & 255u) + 512u))] + this.q[(int)((UIntPtr)((num2 >> 24 & 255u) + 768u))] ^ this.p[(int)((UIntPtr)num)]);
}
else
{
uint num4 = this.q[(int)((UIntPtr)(num - 3u & 1023u))];
uint num5 = this.q[(int)((UIntPtr)(num - 1023u & 1023u))];
this.q[(int)((UIntPtr)num)] += this.q[(int)((UIntPtr)(num - 10u & 1023u))] + (HC256Engine.RotateRight(num4, 10) ^ HC256Engine.RotateRight(num5, 23)) + this.p[(int)((UIntPtr)((num4 ^ num5) & 1023u))];
num4 = this.q[(int)((UIntPtr)(num - 12u & 1023u))];
result = (this.p[(int)((UIntPtr)(num4 & 255u))] + this.p[(int)((UIntPtr)((num4 >> 8 & 255u) + 256u))] + this.p[(int)((UIntPtr)((num4 >> 16 & 255u) + 512u))] + this.p[(int)((UIntPtr)((num4 >> 24 & 255u) + 768u))] ^ this.q[(int)((UIntPtr)num)]);
}
this.cnt = (this.cnt + 1u & 2047u);
return(result);
}
