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(MD5): added final methods.

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This commit is contained in:
morkt 2017-10-28 11:43:25 +04:00
parent 64ba3f8294
commit da1762dc64
1 changed files with 47 additions and 5 deletions
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52
ArcFormats/MD5.cs
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@ -103,6 +103,7 @@ namespace GameRes.Cryptography
public class MD5 : MD5Base
{
long m_bit_count;
int m_buf_pos;
public uint[] State { get { return m_state; } }
@ -118,25 +119,42 @@ namespace GameRes.Cryptography
m_state[2] = 0x98BADCFE;
m_state[3] = 0x10325476;
m_bit_count = 0;
m_buf_pos = 0;
}
public byte[] ComputeHash (byte[] data)
{
return ComputeHash (data, 0, data.Length);
}
public byte[] ComputeHash (byte[] data, int pos, int count)
{
Initialize();
Update (data, pos, count);
Final();
var hash = new byte[16];
Buffer.BlockCopy (m_state, 0, hash, 0, 16);
return hash;
}
public void Update (byte[] data, int pos, int count)
{
int buf_pos = (int)(m_bit_count >> 3) & 0x3F;
m_bit_count += (long)count << 3;
if (buf_pos != 0)
if (m_buf_pos != 0)
{
int buf_count = 64 - buf_pos;
int buf_count = 64 - m_buf_pos;
if (count < buf_count)
{
Buffer.BlockCopy (data, pos, m_buffer, buf_pos, count);
Buffer.BlockCopy (data, pos, m_buffer, m_buf_pos, count);
m_buf_pos += count;
return;
}
Buffer.BlockCopy (data, pos, m_buffer, buf_pos, buf_count);
Buffer.BlockCopy (data, pos, m_buffer, m_buf_pos, buf_count);
Transform();
pos += buf_count;
count -= buf_count;
m_buf_pos = 0;
}
// data is processed in 64-byte chunks
while (count >= 64)
@ -149,7 +167,31 @@ namespace GameRes.Cryptography
if (count > 0)
{
Buffer.BlockCopy (data, pos, m_buffer, 0, count);
m_buf_pos += count;
}
}
public void Final ()
{
Buffer.BlockCopy (Terminator, 0, m_buffer, m_buf_pos++, 1);
int buf_count = 64 - m_buf_pos;
if (buf_count < 8)
{
Buffer.BlockCopy (ZeroBytes, 0, m_buffer, m_buf_pos, buf_count);
Transform();
m_buf_pos = 0;
buf_count = 64;
}
Buffer.BlockCopy (ZeroBytes, 0, m_buffer, m_buf_pos, buf_count-8);
m_buffer[14] = (uint)m_bit_count;
m_buffer[15] = (uint)(m_bit_count >> 32);
Transform();
m_buf_pos = 0;
// XXX m_bit_count is not reset -- this is intentional.
}
static readonly byte[] Terminator = new byte[1] { 0x80 };
static readonly byte[] ZeroBytes = new byte[56];
}
}