수다닷컴

#include windows.h
#include wincrypt.h
#include stdio.h
#define KEYLENGTH 0x00380000
void HandleError(char *s);
#define ENCRYPT_ALGORITHM CALG_RC4
#define ENCRYPT_BLOCK_SIZE 8
BOOL EncryptFile(
PCHAR szSource,
PCHAR szDestination,
PCHAR szPassword);
void main(void)
{
PCHAR szSource;
PCHAR szDestination;
PCHAR szPassword;
if(!(szSource=(char *)malloc(100)))
HandleError(Memory allocation failed.);
if(!(szDestination=(char *)malloc(100)))
HandleError(Memory allocation failed.);
if(!(szPassword=(char *)malloc(100)))
HandleError(Memory allocation failed.);
printf(Encrypt a file. \n\n);
printf(Enter the name of the file to be encrypted: );
scanf(%s,szSource);
printf(Enter the name of the output file: );
scanf(%s,szDestination);
printf(Enter the passwordL );
scanf(%s,szPassword);

if(EncryptFile(szSource, szDestination, szPassword))
{
printf(Encryption of the file %s was a success. \n, szSource);
printf(The encrypted data is in file %s. \n, szDestnation);
}
else
{
printf(Error encrypting file!.);
}
getchar();
}
BOOL EncryptFile(
PCHAR szSource,
PCHAR szDestination,
PCHAR szPassword)
{
FILE *hSource;
FILE *hDestination;
HCRYPTPROV hCryptProv;
HCRYPTKEY hKey;
HCRYPTHASH hHash;
PBYTE pbBuffer;
DWORD dwBlickLen;
DWORD dwBufferLen;
DWORD dwCount;
if(hSource = fopen(szSource,rb))
{
printf(The source plaintext file, %s, is open. \n,szSource);
}

else
{
printf(Eroo opening source plaintext file!);
}
if(hDestination = fopen(szDestinationm wb))
{
printf(Destination file %s is open. \n,szDestination);
}
else
{
printf(Error opening destination ciphertext file!);
}

if(CryptAcquireContext(
&hCryptProv,
0,
MS_ENHANCED_PROV,
PROV_RSA_FULL,
0))
{
printf(A cryptographic provider has been acqurired. \n);
}
else
{
printf(Error during CryptAcquireContext!);
}
if(CryptCreateHash(
hCryptProv,
CALG_MD5,
0,
0,
&hHash))
{
printf(A hash object has been created. \n);
}
else
{
printf(Error during CryptCreateHash!\n);
}
if(cryptHashData(
hHash,
(BYTE *)szPassword,
Strlen(szPasswrod),
0))
{
printf(The password has been added to the hash. \n);
}
else
{
printf(Error during CryptHashData. \n);
}
if(cryptDeriveKey(
hCryptProv,
ENCRYPT_ALGORITHM,
hHash,
KEYLENGTH,
%hKey))
{
printf(An encryption key is derived from password hash. \n);
}
else
{
printf(Error during CryptDeriveKey!\n);
}
CryptDestroyHash(hHash);
hHash = 0;
dwBlockLen = 1000 - 1000 % ENCRYPT_BLOCK_SIZE;
if(ENCRYPT_BLOCK_SIZE 1)
dwBufferLen = dwBlockLen + ENCRYPT_BLOCK_SIZE;
else
dwBufferLen = dwBlockLen;
if(pbBuffer = (BYTE *)malloc(dwBufferLen + 1))
{
printf(Memory has been allocated for the buffer. \n);
}
else
{
printf(Out of memory. \n);
}
memset(pbBuffer, 0, dwBufferLen + 1 );
do
{
dwCount = fread(pbBuffer, 1, dwBlockLen, hSource);
if(ferror(hSource))
{
printf(Error reading plaintext!\n);
}
if(!CryptEncrypt(
hKey,
0,
feof(hSource),
0,
pbBufer,
&dwCount,
dwBufferLen))
{
printf(Error during CryptEncrypt. \n);
}
fwrite(pbBuffer, 1, dwCount, hDestination);
if(ferror(hDestination))
{
printf(Error writing ciphertext.);
}
}
while(!feof(hSource));
if(hSource)
fclose(hSource);
if(hDestination)
fclose(hDestination);
if(pbBuffer)
free(pbBuffer);
if(hKey)
CryptDestoryKey(hKey);
if(hHash)
CryptDestoryKey(hHash);
if(hCryptProv)
CryptReleaseContext(hcryptProv, 0);
trturn(TRUE);
}
fprintf(stderr, %s, (LPCTSTR) lpMsgBuf);
getchar();
exit(1);
}

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