util.h File Reference

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Functions
ULONG	ComputeCrc32 (const BYTE *pData, INT iLen, ULONG initial_crc) DECLSPEC_HIDDEN
SECURITY_STATUS	SECUR32_CreateNTLM1SessionKey (PBYTE password, int len, PBYTE session_key) DECLSPEC_HIDDEN
SECURITY_STATUS	SECUR32_CreateNTLM2SubKeys (PNegoHelper helper) DECLSPEC_HIDDEN
arc4_info *	SECUR32_arc4Alloc (void) DECLSPEC_HIDDEN
void	SECUR32_arc4Init (arc4_info *a4i, const BYTE *key, unsigned int keyLen) DECLSPEC_HIDDEN
void	SECUR32_arc4Process (arc4_info *a4i, BYTE *inoutString, unsigned int length) DECLSPEC_HIDDEN
void	SECUR32_arc4Cleanup (arc4_info *a4i) DECLSPEC_HIDDEN

Function Documentation

ComputeCrc32()

ULONG ComputeCrc32	(	const BYTE *	pData,
		INT	iLen,
		ULONG	initial_crc
	)

Definition at line 109 of file util.c.

{
  ULONG crc = ~initial_crc;

  while (iLen > 0)
  {
    crc = CRC_table[(crc ^ *pData) & 0xff] ^ (crc >> 8);
    pData++;
    iLen--;
  }
  return ~crc;
}

Referenced by ntlm_CreateSignature().

SECUR32_arc4Alloc()

arc4_info* SECUR32_arc4Alloc

(

void

)

Definition at line 189 of file util.c.

{
    arc4_info *a4i = HeapAlloc(GetProcessHeap(), 0, sizeof(arc4_info));
    return a4i;
}

Referenced by ntlm_AcceptSecurityContext(), and ntlm_InitializeSecurityContextW().

SECUR32_arc4Cleanup()

void SECUR32_arc4Cleanup

(

arc4_info *

a4i

)

Definition at line 246 of file util.c.

{
    HeapFree(GetProcessHeap(), 0, a4i);
}

Referenced by ntlm_DeleteSecurityContext().

SECUR32_arc4Init()

void SECUR32_arc4Init	(	arc4_info *	a4i,
		const BYTE *	key,
		unsigned int	keyLen
	)

Definition at line 199 of file util.c.

{
    unsigned int keyIndex = 0, stateIndex = 0;
    unsigned int i, a;

    TRACE("(%p, %p, %d)\n", a4i, key, keyLen);

        a4i->x = a4i->y = 0;

    for (i=0; i<256; i++)
        a4i->state[i] = i;

    for (i=0; i<256; i++)
    {
        a = a4i->state[i];
        stateIndex += key[keyIndex] + a;
        stateIndex &= 0xff;
        a4i->state[i] = a4i->state[stateIndex];
        a4i->state[stateIndex] = a;
        if (++keyIndex >= keyLen)
            keyIndex = 0;
    }

}

Referenced by ntlm_AcceptSecurityContext(), and ntlm_InitializeSecurityContextW().

SECUR32_arc4Process()

void SECUR32_arc4Process	(	arc4_info *	a4i,
		BYTE *	inoutString,
		unsigned int	length
	)

Definition at line 224 of file util.c.

{
    BYTE *const s=a4i->state;
    unsigned int x = a4i->x;
    unsigned int y = a4i->y;
    unsigned int a, b;

    while(length--)
    {
        x = (x+1) & 0xff;
        a = s[x];
        y = (y+a) & 0xff;
        b = s[y];
        s[x] = b;
        s[y] = a;
        *inoutString++ ^= s[(a+b) & 0xff];
    }

    a4i->x = x;
    a4i->y = y;
}

Referenced by ntlm_CreateSignature(), ntlm_DecryptMessage(), and ntlm_EncryptMessage().

SECUR32_CreateNTLM1SessionKey()

SECURITY_STATUS SECUR32_CreateNTLM1SessionKey	(	PBYTE	password,
		int	len,
		PBYTE	session_key
	)

Definition at line 122 of file util.c.

{
    MD4_CTX ctx;
    BYTE ntlm_hash[16];

    TRACE("(%p, %p)\n", password, session_key);

    MD4Init(&ctx);
    MD4Update(&ctx, password, len);
    MD4Final(&ctx);

    memcpy(ntlm_hash, ctx.digest, 0x10);

    MD4Init(&ctx);
    MD4Update(&ctx, ntlm_hash, 0x10u);
    MD4Final(&ctx);

    memcpy(session_key, ctx.digest, 0x10);

    return SEC_E_OK;
}

SECUR32_CreateNTLM2SubKeys()

SECURITY_STATUS SECUR32_CreateNTLM2SubKeys

(

PNegoHelper

helper

)

Definition at line 156 of file util.c.

{
    helper->crypt.ntlm2.send_sign_key = HeapAlloc(GetProcessHeap(), 0, 16);
    helper->crypt.ntlm2.send_seal_key = HeapAlloc(GetProcessHeap(), 0, 16);
    helper->crypt.ntlm2.recv_sign_key = HeapAlloc(GetProcessHeap(), 0, 16);
    helper->crypt.ntlm2.recv_seal_key = HeapAlloc(GetProcessHeap(), 0, 16);

    if(helper->mode == NTLM_CLIENT)
    {
        SECUR32_CalcNTLM2Subkey(helper->session_key, client_to_server_sign_constant,
                helper->crypt.ntlm2.send_sign_key);
        SECUR32_CalcNTLM2Subkey(helper->session_key, client_to_server_seal_constant,
                helper->crypt.ntlm2.send_seal_key);
        SECUR32_CalcNTLM2Subkey(helper->session_key, server_to_client_sign_constant,
                helper->crypt.ntlm2.recv_sign_key);
        SECUR32_CalcNTLM2Subkey(helper->session_key, server_to_client_seal_constant,
                helper->crypt.ntlm2.recv_seal_key);
    }
    else
    {
        SECUR32_CalcNTLM2Subkey(helper->session_key, server_to_client_sign_constant,
                helper->crypt.ntlm2.send_sign_key);
        SECUR32_CalcNTLM2Subkey(helper->session_key, server_to_client_seal_constant,
                helper->crypt.ntlm2.send_seal_key);
        SECUR32_CalcNTLM2Subkey(helper->session_key, client_to_server_sign_constant,
                helper->crypt.ntlm2.recv_sign_key);
        SECUR32_CalcNTLM2Subkey(helper->session_key, client_to_server_seal_constant,
                helper->crypt.ntlm2.recv_seal_key);
    }

    return SEC_E_OK;
}