118 lines
2.8 KiB
C++
118 lines
2.8 KiB
C++
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// HASH.CPP
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//
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// Hash utility functions for use in NetMeeting components.
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#include "precomp.h"
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#include <oprahcom.h>
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#include "nb30.h"
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#include "regentry.h"
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#include "confreg.h"
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CHash::CHash() : m_hProv(0), m_hHash(0), m_pbHashedData(NULL), m_cbHashedData(0), m_fReady(FALSE)
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{
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if (!CryptAcquireContext(&m_hProv, NULL, MS_DEF_PROV, PROV_RSA_FULL, CRYPT_MACHINE_KEYSET))
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{
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// Create new if can not get default
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if (!CryptAcquireContext(&m_hProv, NULL, MS_DEF_PROV, PROV_RSA_FULL, CRYPT_NEWKEYSET | CRYPT_MACHINE_KEYSET))
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{
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goto ErrorExit;
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}
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}
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m_fReady = TRUE;
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return;
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ErrorExit:
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m_fReady = FALSE;
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}
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CHash::~CHash()
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{
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if (m_pbHashedData) delete []m_pbHashedData;
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CryptAcquireContext(&m_hProv, NULL, MS_DEF_PROV, PROV_RSA_FULL, CRYPT_DELETEKEYSET | CRYPT_MACHINE_KEYSET);
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if (m_hHash) CryptDestroyHash(m_hHash);
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if (m_hProv) CryptReleaseContext(m_hProv, 0);
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}
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DWORD CHash::GetHashedData(PBYTE pbData, DWORD cbData, void ** ppvHashedData)
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{
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ASSERT(NULL != ppvHashedData);
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ASSERT(NULL != pbData);
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DWORD dwCount;
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RegEntry re(WINDOWS_KEY, HKEY_LOCAL_MACHINE);
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if (FALSE == m_fReady)
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{
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goto ErrorExit;
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}
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if (0 == cbData) {
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goto ErrorExit;
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}
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if (m_hHash) CryptDestroyHash(m_hHash);
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if (!CryptCreateHash(m_hProv, CALG_MD5, 0, 0, &m_hHash))
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{
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ERROR_OUT(("CHash::GetHashData() - Error creating crypt hash object."));
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goto ErrorExit;
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}
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if (!CryptHashData(m_hHash, pbData, cbData, 0))
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{
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ERROR_OUT(("CHash::GetHashData() - Error hashing data."));
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goto ErrorExit;
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}
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if (!CryptHashData(m_hHash, (PBYTE) re.GetString(REGVAL_REGISTERED_USER),
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lstrlen(re.GetString(REGVAL_REGISTERED_USER)), 0))
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{
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ERROR_OUT(("CHash::GetHashData() - Error hashing extra data."));
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goto ErrorExit;
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}
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NCB ncb;
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BYTE buf[sizeof(NCB) + 256];
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ZeroMemory ( &ncb, sizeof(ncb));
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ncb.ncb_command = NCBASTAT;
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ncb.ncb_buffer = buf;
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ncb.ncb_length = sizeof(buf);
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memcpy ( (PBYTE)ncb.ncb_callname, (PBYTE)"* ", NCBNAMSZ );
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if ( NRC_GOODRET == Netbios(&ncb) )
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{
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//
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// NOTE: the buffer filled by the Netbios ASTAT command starts
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// with a 6-byte encoded adapter address: just use the raw
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// buffer rather than casting back to PBYTE
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//
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if (!CryptHashData(m_hHash, buf, 6, 0 ))
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{
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ERROR_OUT(("CHash::GetHashData() - Error hashing ncb data."));
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goto ErrorExit;
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}
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}
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else
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{
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WARNING_OUT(("CHash::GetHashData: Netbios failed %x", ncb.ncb_retcode));
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}
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dwCount = sizeof(DWORD);
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if (!CryptGetHashParam(m_hHash, HP_HASHSIZE, (BYTE *)&m_cbHashedData, &dwCount, 0))
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{
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goto ErrorExit;
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}
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if (m_pbHashedData) delete [] m_pbHashedData;
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if (NULL == (m_pbHashedData = new BYTE[m_cbHashedData]))
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{
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goto ErrorExit;
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}
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if (!CryptGetHashParam(m_hHash, HP_HASHVAL, m_pbHashedData, &m_cbHashedData, 0)) {
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goto ErrorExit;
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}
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*ppvHashedData = m_pbHashedData;
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return m_cbHashedData;
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ErrorExit:
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return 0; // Hash data failed
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}
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