void Cipher::SetKey (const ConstBufferPtr &key)
{
if (key.Size() != GetKeySize ())
throw ParameterIncorrect (SRC_POS);
if (!Initialized)
ScheduledKey.Allocate (GetScheduledKeySize ());
SetCipherKey (key);
Key.CopyFrom (key);
Initialized = true;
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% G e n e r a t e S e c r e t K e y %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% GenerateSecretKey() returns WizardTrue if a key is generated and successfully
% added to the secret key ring.
%
% The format of the GenerateSecretKey method is:
%
% WizardBooleanType GenerateSecretKey(SecretInfo *secret_info,
% ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o secret_info: The secret info.
%
% o exception: Return any errors or warnings in this structure.
%
*/
WizardExport WizardBooleanType GenerateSecretKey(SecretInfo *secret_info,
ExceptionInfo *exception)
{
ExceptionInfo
*sans;
WizardBooleanType
status;
StringInfo
*key,
*phrase;
(void) LogWizardEvent(TraceEvent,GetWizardModule(),"...");
WizardAssert(AuthenticateDomain,secret_info != (SecretInfo *) NULL);
WizardAssert(AuthenticateDomain,secret_info->signature == WizardSignature);
WizardAssert(AuthenticateDomain,exception != (ExceptionInfo *) NULL);
if (secret_info->passphrase == (char *) NULL)
phrase=GetPassphrase(exception);
else
phrase=FileToStringInfo(secret_info->passphrase,~0,exception);
if (phrase == (StringInfo *) NULL)
return(WizardFalse);
sans=AcquireExceptionInfo();
do
{
if (secret_info->key != (StringInfo *) NULL)
secret_info->key=DestroyStringInfo(secret_info->key);
secret_info->key=GetRandomKey(secret_info->random_info,
secret_info->key_length/8);
ConstructHMAC(secret_info->hmac_info,phrase,secret_info->key);
if (secret_info->id != (StringInfo *) NULL)
secret_info->id=DestroyStringInfo(secret_info->id);
secret_info->id=CloneStringInfo(GetHMACDigest(secret_info->hmac_info));
SetKeyringId(secret_info->keyring_info,secret_info->id);
status=ExportKeyringKey(secret_info->keyring_info,sans);
} while (status != WizardFalse);
sans=DestroyExceptionInfo(sans);
SetKeyringKey(secret_info->keyring_info,secret_info->key);
SetKeyringNonce(secret_info->keyring_info,secret_info->nonce);
SetCipherKey(secret_info->cipher_info,phrase);
SetCipherNonce(secret_info->cipher_info,GetKeyringNonce(
secret_info->keyring_info));
key=CloneStringInfo(GetKeyringKey(secret_info->keyring_info));
(void) EncipherCipher(secret_info->cipher_info,key);
SetKeyringKey(secret_info->keyring_info,key);
status=ImportKeyringKey(secret_info->keyring_info,exception);
phrase=DestroyStringInfo(phrase);
key=DestroyStringInfo(key);
return(WizardTrue);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% A u t h e n t i c a t e S e c r e t K e y %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% AuthenticateSecretKey() returns WizardTrue if the caller is authenticated.
%
% The format of the AuthenticateSecretKey method is:
%
% void AuthenticateSecretKey(SecretInfo *secret_info,
% ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o secret_info: The secret info.
%
% o exception: Return any errors or warnings in this structure.
%
*/
WizardExport WizardBooleanType AuthenticateSecretKey(SecretInfo *secret_info,
ExceptionInfo *exception)
{
WizardBooleanType
status;
StringInfo
*digest,
*phrase;
(void) LogWizardEvent(TraceEvent,GetWizardModule(),"...");
WizardAssert(AuthenticateDomain,secret_info != (SecretInfo *) NULL);
WizardAssert(AuthenticateDomain,secret_info->signature == WizardSignature);
SetKeyringId(secret_info->keyring_info,secret_info->id);
status=ExportKeyringKey(secret_info->keyring_info,exception);
if (status == WizardFalse)
return(WizardFalse);
if (secret_info->passphrase == (char *) NULL)
phrase=GetPassphrase(exception);
else
phrase=FileToStringInfo(secret_info->passphrase,~0,exception);
if (phrase == (StringInfo *) NULL)
return(WizardFalse);
SetCipherKey(secret_info->cipher_info,phrase);
SetCipherNonce(secret_info->cipher_info,GetKeyringNonce(
secret_info->keyring_info));
if (secret_info->key != (StringInfo *) NULL)
secret_info->key=DestroyStringInfo(secret_info->key);
secret_info->key=CloneStringInfo(GetKeyringKey(secret_info->keyring_info));
(void) DecipherCipher(secret_info->cipher_info,secret_info->key);
ConstructHMAC(secret_info->hmac_info,phrase,secret_info->key);
phrase=DestroyStringInfo(phrase);
digest=CloneStringInfo(GetHMACDigest(secret_info->hmac_info));
if (CompareStringInfo(secret_info->id,digest) != 0)
{
digest=DestroyStringInfo(digest);
return(WizardFalse);
}
digest=DestroyStringInfo(digest);
return(WizardTrue);
}
// ----------------------------------------------------------------------------
// MAINLINE LOGIC
// ----------------------------------------------------------------------------
int main() {
// declarations
int action = UNSET;
char rawPT[BUFFER_SIZE] = "";
char cleanPT[BUFFER_SIZE] = "";
int a = A, b = B, inverse = INVERSE, n = ALPHABET_SIZE;
char nameInputFile[30] = "input.txt" ;
char nameOutputFile[30] = "output.txt";
// seed the random number generator
srand((unsigned int)time(NULL));
// get ready
action = fGetClnStr(action, rawPT, cleanPT);
// display title page
DispHeader(nameInputFile, nameOutputFile, a, b, inverse);
puts("Welcome to Derrida - the command line Affine Cipher!");
Pause();
// detail loop
while(action != QUIT) {
ClearScreen();
DispHeader(nameInputFile, nameOutputFile, a, b, inverse);
// select an action
action = SelectAction(action);
DispHeader(nameInputFile, nameOutputFile, a, b, inverse);
// execute action
switch(action) {
case SET_I_FILE: // change the input file
action = fGetClnStr(action, rawPT, cleanPT, nameInputFile);
break;
case SET_O_FILE: // change the output file
action = SetOutputFileName(nameOutputFile);
break;
case DIR_LIST: // display directory listing
list_dir();
break;
case SET_KEY: // change cipher key
action = SetCipherKey(a, b, n, inverse);
break;
case ENCRYPT: // encrypt the PT codes
// display the string before encryption
printf("Before encryption, the string contains:\n");
puts(rawPT);
printf("\n");
printf("Sanatized, the string contains:\n");
puts(cleanPT);
printf("\n");
// if encryption succeeds, inform the user
if(EncryptString(cleanPT, a, b, n)) {
FileOutput(nameOutputFile, cleanPT);
printf("After encryption, the string contains:\n");
puts(cleanPT);
printf("\n");
}
Pause();
break;
case DECRYPT:
// display the clean cipher code before decryption
puts("Before decryption, the string contains:");
puts(cleanPT);
puts("\n");
// if decryption succeeds, inform the user
if(DecryptString(cleanPT, a, b, n)) {
FileOutput(nameOutputFile, cleanPT);
puts("After decryption, the string contains:\n");
puts(cleanPT);
puts("\n");
}
Pause();
break;
}
}
puts("The program will now exit.");
Pause();
// exit program
return 0;
}
