DataChunk DESECBEncrypt(DataChunk messageChunk, Block key)
{
DataChunk cipherChunk = initDataChunk(messageChunk.iLength - messageChunk.iLength % 8 + 16);
Block message = initBlock(64), cipher;
KeySchedule k;
int i;
cipher = initBlock(64);
k = DESKeySchedule(key);
for (i = 0; i < messageChunk.iLength / 8; i++) {
memcpy(message, messageChunk.block + 8 * i, 8);
cipher = DESEncrypt(message, k);
memcpy(cipherChunk.block + 8 * i, cipher, 8);
}
free(message);
// If the length is not an integral multiple of 8.
if (messageChunk.iLength % 8) {
memcpy((message = initBlock(64)), messageChunk.block + 8 * i, messageChunk.iLength % 8);
cipher = DESEncrypt(message, k);
memcpy(cipherChunk.block + 8 * i, cipher, 8);
}
return (cipherChunk);
}
int main(void)
{
DataChunk messageChunk = initDataChunk(150), cipherChunk, decryptChunk;
Block message = initBlock(64), cipher;
Block key1, key2, IV;
KeySchedule k1, k2;
int i;
key1 = takeHexInput();
key2 = takeHexInput();
k1 = DESKeySchedule(key1);
k2 = DESKeySchedule(key2);
/*
message = inputString(stdin, 150);
cipher = DES3Encrypt(message, k1, k2);
printf("\n");
for (i = 0; i < 8; i++)
printf("%x ", cipher[i]);
printf("\n");
fwrite(DES3Decrypt(cipher, k1, k2), 1, 9, stdout);
printf("\n");
*/
//
messageChunk.block = inputString(stdin, 150);
messageChunk.iLength = strlen(messageChunk.block) + 1;
cipherChunk = DESCBCEncrypt(messageChunk, key1);
printf("\n");
for (i = 0; i < cipherChunk.iLength; i++)
printf("%x ", cipherChunk.block[i]);
printf("\n");
decryptChunk = DESCBCDecrypt(cipherChunk, key1);
(decryptChunk.iLength)++;
printf("%s", decryptChunk.block);
//
return (0);
}
void testDES() {
Block message = initBlock(64);
KeySchedule k1;
Block key = (unsigned char*)"12345678";
Block cifer;
memset(message, 0x01, 8);
k1 = DESKeySchedule(key);
cifer = DESEncrypt(message, k1);
//17 c1 2b 68 ab 3a a1 4c
}