bool CWSKey::Load(char *filename)
{
int version = 0;
char junk1[1234] = {0};
char junk2[3456] = {0};
FILE *file = 0;
// Decrypt
byte key[AES::DEFAULT_KEYLENGTH];
byte iv[AES::BLOCKSIZE];
// Write Key File
file = fopen(filename, "rb");
if (file == 0) {
WSK_LOG("Failed To Open The Key File");
return false;
}
// Read Encrypted Key Data
fread(&version, sizeof(version), 1, file); // read version
if (version != WSK_VERSION) { // Check Version
WSK_LOG("Wrong Version Of Key");
fclose(file);
return false;
}
fread(junk1, sizeof(junk1), 1, file); // read junk
fread(&m_key, sizeof(m_key), 1, file); // read Key Data
fread(key, sizeof(key), 1, file); // AES KEY
fread(iv, sizeof(iv), 1, file); // AES iv
fread(junk2, sizeof(junk2), 1, file); // read junk
// Close file
fclose(file);
// Decrypt
CFB_Mode<AES>::Decryption cfbDecryption(key, AES::DEFAULT_KEYLENGTH, iv);
cfbDecryption.ProcessData((byte*)junk1, (byte*)junk1, sizeof(junk1));
cfbDecryption.ProcessData((byte*)&m_key, (byte*)&m_key, sizeof(m_key));
cfbDecryption.ProcessData((byte*)junk2, (byte*)junk2, sizeof(junk2));
return true;
}
void AESDecryptFile( const char *keyFilename,
const char *messageFilename,
const char *outputFilename ) {
// hex decoding halvs length
int bufferLength = 256;
char *keyBuffer = new char[ bufferLength + 1 ];
// add string termination
keyBuffer[ bufferLength ] = '\0';
// read in the key
FileSource keyFile( keyFilename, true,
new HexDecoder(
new ArraySink( (unsigned char*)keyBuffer,
bufferLength ) ) );
// iv is all-zero
char *iv = new char[ 32 ];
for( int i=0; i<32; i++ ) {
iv[i] = 0;
}
AESEncryption aesEncryption( (byte *)keyBuffer, 32 );
CFB_Mode_ExternalCipher::Decryption cfbDecryption( aesEncryption,
(byte *)iv );
FILE *messageFile = fopen( messageFilename, "r" );
FILE *outputFile = fopen( outputFilename, "wb" );
if( messageFile != NULL && outputFile != NULL ) {
char *oneCharInputString = new char[2];
oneCharInputString[1] = '\0';
char *oneCharOutputString = new char[2];
oneCharOutputString[1] = '\0';
int charReadAsInt = getc( messageFile );
while( charReadAsInt != EOF ) {
unsigned char charReadAsChar = (unsigned char)charReadAsInt;
oneCharInputString[0] = charReadAsChar;
cfbDecryption.ProcessString( (byte *)oneCharOutputString,
(byte *)oneCharInputString, 1 );
// FIXME: need to hex-encode output
fprintf( outputFile, "%s", oneCharOutputString );
charReadAsInt = getc( messageFile );
}
fclose( messageFile );
fclose( outputFile );
delete [] oneCharOutputString;
delete [] oneCharInputString;
}
delete [] keyBuffer;
delete [] iv;
}
