UT_Error ODc_Crypto::decrypt(GsfInput* pStream, const ODc_CryptoInfo& cryptInfo,
const std::string& password, GsfInput** pDecryptedInput)
{
UT_return_val_if_fail(pStream, UT_ERROR);
UT_return_val_if_fail(pDecryptedInput, UT_ERROR);
// check if we support the requested decryption method
UT_return_val_if_fail(g_ascii_strcasecmp(cryptInfo.m_algorithm.c_str(), "Blowfish CFB") == 0, UT_ERROR);
UT_return_val_if_fail(g_ascii_strcasecmp(cryptInfo.m_keyType.c_str(), "PBKDF2") == 0, UT_ERROR);
// base64 decode the salt
gsize salt_length;
unsigned char* salt = g_base64_decode(cryptInfo.m_salt.c_str(), &salt_length);
// base64 decode the initialization vector
gsize ivec_length;
unsigned char* ivec = g_base64_decode(cryptInfo.m_initVector.c_str(), &ivec_length);
// decrypt the content
UT_Error result = performDecrypt(pStream, salt, salt_length, cryptInfo.m_iterCount,
ivec, password, cryptInfo.m_decryptedSize, pDecryptedInput);
// cleanup
FREEP(salt);
FREEP(ivec);
return result;
}
int main(int argc, char *argv[])
{
//skip argv[0]
argc--;
argv++;
if(argc <= 0) //No arguments provided
{
fprintf(stderr, "Please enter command line arguments.\n");
printUsage();
return EXIT_FAILURE;
}
//tablecheck
if(strcmp(*argv, "tablecheck") == 0)
{
if(argc-1 < 1 || argc-1 > 1)
{
fprintf(stderr, "Malformed command.\n");
printUsage();
return EXIT_FAILURE;
}
char* tablefile = malloc(100*sizeof(char));
for(argc--; argc>0; argc--)
{
argv++;
if(strlen(*argv) < 4)
{
fprintf(stderr, "Malformed command.\n");
printUsage();
return EXIT_FAILURE;
}
//tablefile
if(argv[0][0]=='-' && argv[0][1]=='t' && argv[0][2]=='=')
{
//Get tablefile from argv
int i=0;
for(i=3; i<strlen(*argv); i++)
{
tablefile[i-3] = argv[0][i];
}
tablefile[i-3] = '\0';
}
else
{
fprintf(stderr, "Malformed command.\n");
printUsage();
return EXIT_FAILURE;
}
}
checkTable(tablefile);
}
//modprod
else if(strcmp(*argv, "modprod") == 0)
{
//Get hold of arguments
char* poly1 = malloc(100*sizeof(char));
char* poly2 = malloc(100*sizeof(char));
//No, less or extra parameters for modprod
if(argc-1 < 2 || argc-1 > 2)
{
fprintf(stderr, "Malformed command.\n");
printUsage();
return EXIT_FAILURE;
}
for(argc--; argc>0; argc--)
{
argv++;
if(strlen(*argv) < 5)
{
fprintf(stderr, "Malformed command.\n");
printUsage();
return EXIT_FAILURE;
}
//poly1
if(argv[0][0]=='-' && argv[0][1]=='p' && argv[0][2]=='1' && argv[0][3]=='=')
{
//Get poly1 from argv
int i=0;
for(i=4; i<strlen(*argv); i++)
{
poly1[i-4] = argv[0][i];
}
poly1[i-4] = '\0';
}
//poly2
else if(argv[0][0]=='-' && argv[0][1]=='p' && argv[0][2]=='2' && argv[0][3]=='=')
{
//Get poly2 from argv
int i=0;
for(i=4; i<strlen(*argv); i++)
{
poly2[i-4] = argv[0][i];
}
poly2[i-4] = '\0';
}
else
{
fprintf(stderr, "Malformed command.\n");
printUsage();
return EXIT_FAILURE;
}
}
if(strlen(poly1) == 0 || strlen(poly2) == 0)
{
fprintf(stderr, "Malformed command.\n");
printUsage();
return EXIT_FAILURE;
}
computeModprod(poly1, poly2);
free(poly1);
free(poly2);
}
//keyexpand
else if(strcmp(*argv, "keyexpand") == 0)
{
//Get hold of arguments
char* key = malloc(100*sizeof(char));
char* tablefileName = malloc(100*sizeof(char));
//No, less or extra parameters for keyexpand
if(argc-1 < 2 || argc-1 > 2)
{
fprintf(stderr, "Malformed command.\n");
printUsage();
return EXIT_FAILURE;
}
for(argc--; argc>0; argc--)
{
argv++;
if(strlen(*argv) < 4)
{
fprintf(stderr, "Malformed command.\n");
printUsage();
return EXIT_FAILURE;
}
//key
if(argv[0][0]=='-' && argv[0][1]=='k' && argv[0][2]=='=')
{
//Get key from argv
int i=0;
for(i=3; i<strlen(*argv); i++)
{
key[i-3] = argv[0][i];
}
key[i-3] = '\0';
}
//tablefile
else if(argv[0][0]=='-' && argv[0][1]=='t' && argv[0][2]=='=')
{
//Get tablefile from argv
int i=0;
for(i=3; i<strlen(*argv); i++)
{
tablefileName[i-3] = argv[0][i];
}
tablefileName[i-3] = '\0';
}
else
{
fprintf(stderr, "Malformed command.\n");
printUsage();
return EXIT_FAILURE;
}
}
if(strlen(key) == 0 || strlen(tablefileName) == 0)
{
fprintf(stderr, "Malformed command.\n");
printUsage();
return EXIT_FAILURE;
}
expandKey(key, tablefileName);
free(key);
free(tablefileName);
}
//Encrypt - Decrypt
else if(strcmp(*argv, "encrypt") == 0 || strcmp(*argv, "decrypt") == 0)
{
char command[10]="";
if(strcmp(*argv, "encrypt") == 0)strcpy(command, "encrypt");
if(strcmp(*argv, "decrypt") == 0)strcpy(command, "decrypt");
//Get hold of arguments
char* key = malloc(100*sizeof(char));
char* tableFileName = malloc(100*sizeof(char));
char* file = malloc(100*sizeof(char));
*file='\0';
//No, less or extra parameters
if(argc-1 < 2 || argc-1 > 3)
{
fprintf(stderr, "Malformed command.\n");
printUsage();
return EXIT_FAILURE;
}
for(argc--; argc>0; argc--)
{
argv++;
//Commanldine option encountered
if(argv[0][0] == '-')
{
if(strlen(*argv) < 4)
{
fprintf(stderr, "Malformed command.\n");
printUsage();
return EXIT_FAILURE;
}
//key
if(argv[0][0]=='-' && argv[0][1]=='k' && argv[0][2]=='=')
{
//Get key from argv
int i=0;
for(i=3; i<strlen(*argv); i++)
{
key[i-3] = argv[0][i];
}
key[i-3] = '\0';
}
else if(argv[0][0]=='-' && argv[0][1]=='t' && argv[0][2]=='=')
{
//Get tableFileName from argv
int i=0;
for(i=3; i<strlen(*argv); i++)
{
tableFileName[i-3] = argv[0][i];
}
tableFileName[i-3] = '\0';
}
else
{
fprintf(stderr, "Malformed command.\n");
printUsage();
return EXIT_FAILURE;
}
}
//file
else if(strlen(*argv) > 0)
{
//Get file from argv
int i=0;
for(i=0; i<strlen(*argv); i++)
{
file[i] = argv[0][i];
}
file[i] = '\0';
}
}
//Check for errors
if(strlen(key)==0 || strlen(tableFileName)==0)
{
fprintf(stderr, "Malformed command.\n");
printUsage();
return EXIT_FAILURE;
}
else
{
if(strcmp(command, "encrypt")==0 || strcmp(command, "decrypt")==0)
{
//CHECK FORMAT OF KEY
/*if(strlen(key)!=16)
{
fprintf(stderr, "Key should be 8-bytes long, in hexstring format.\n");
printUsage();
return EXIT_FAILURE;
}
else if(strlen(key)==16)
{
int k=0;
for(k=0; k<16; k++)
{
if(key[k] < 48 || (key[k] > 57 && key[k] < 97) || key[k] > 102)
{
fprintf(stderr, "Key is not in hexstring format.\n");
printUsage();
return EXIT_FAILURE;
}
}
}*/
}
}
if(strlen(key) == 0 || strlen(tableFileName) == 0)
{
fprintf(stderr, "Malformed command.\n");
printUsage();
return EXIT_FAILURE;
}
if(strcmp(command, "encrypt") == 0) performEncrypt(key, tableFileName, file);
if(strcmp(command, "decrypt") == 0) performDecrypt(key, tableFileName, file);
free(key);
free(tableFileName);
free(file);
}
//inverse
else if(strcmp(*argv, "inverse") == 0)
{
if(argc-1 < 1 || argc-1 > 1)
{
fprintf(stderr, "Malformed command.\n");
printUsage();
return EXIT_FAILURE;
}
char* poly = malloc(100*sizeof(char));
for(argc--; argc>0; argc--)
{
argv++;
if(strlen(*argv) < 4)
{
fprintf(stderr, "Malformed command.\n");
printUsage();
return EXIT_FAILURE;
}
//poly
if(argv[0][0]=='-' && argv[0][1]=='p' && argv[0][2]=='=')
{
//Get tablefile from argv
int i=0;
for(i=3; i<strlen(*argv); i++)
{
poly[i-3] = argv[0][i];
}
poly[i-3] = '\0';
}
}
if(strlen(poly) == 0)
{
fprintf(stderr, "Malformed command.\n");
printUsage();
return EXIT_FAILURE;
}
computeInverse(poly);
}
else
{
fprintf(stderr, "Malformed command.\n");
printUsage();
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}