I 've got the following function:
void encrypt(string ivInString, string keyInString, const string
&filename_in, const string &filename_out)
{
SecByteBlock iv(reinterpret_cast<const byte*>(&ivInString[0]),
ivInString.size());
SecByteBlock key(reinterpret_cast<const byte*>(&keyInString[0]),
keyInString.size());
CFB_Mode<AES>::Encryption e;
e.SetKeyWithIV(key.data(), key.size(), iv.data());
ifstream in{ filename_in, ios::binary };
ofstream out{ filename_out, ios::binary };
FileSource f{ in, /*pumpAll=*/true, new StreamTransformationFilter{ e,
new FileSink{out} } };
}
and a similar for decrypting, and they work fine, but this is to encrypt
any sort of file, which is my only way of encrypting the txt, but its not
what i need. What i need is to encrypt a string. The 1st answer in this
link: https://stackoverflow.com/questions/12306956/example-of-aes-using-crypto
, prints all the ciphered text in hex in the line that says "cout << "0x"
<< hex << (0xFF & static_cast<byte>(ciphertext[i])) << " ";". But im not
sure how that hex part even works. Do you know how i can write that into a
txt file?
On Tuesday, November 29, 2022 at 7:43:08 PM UTC+2 [email protected] wrote:
> Could you try to write a minimal working example in a separate project and
> share the code if you still have any issues? Try to write that
> encryption/decryption routines yourself line by line instead of copy&paste
> any examples.
>
> The idea is simple: you read data source, you put data through the filter
> (which does the encryption or decryption) and put the result to the sink.
> So you should setup a source: read file in buffer and use StringSource or
> VectorSource or use FileSource. Then you should prepare an encryption
> filter (StreamTransformationFilter) with appropriate options (you could
> learn it from example code). Then you put the data into the Sink.
> https://www.cryptopp.com/wiki/FileSource
>
> Remember to use same key & iv for decryption. Also binary/text mode is
> important when reading files. Also remember to use same mode (CBC, ECB,
> etc.) for both encryption/decryption algorithm. Use authenticated
> encryption to catch message checksum errors.
>
> Try to experiment with pipelining, e.g. calculating messag digest and
> printing it in hex. When you get the strong feeling what works and what
> isn't you could easily use any encryption/decryption algorithm in Cryptopp.
> Just take some time to read wiki and experiment with library primitives.
> And good luck with that!
> https://www.cryptopp.com/wiki/Pipelining
>
> вторник, 29 ноября 2022 г. в 23:01:33 UTC+7, [email protected]:
>
>> Not sure what you mean by format, i just use something like "myFileStream
>> << cipher", and then read it back again. Do you mean that the txt file
>> should be utf-8 or something like that? What would be the right way to
>> write the ciphered string to the txt file and read it afterwards? Thanks a
>> lot for answering btw.
>>
>> On Tuesday, November 29, 2022 at 4:15:37 PM UTC+2 [email protected]
>> wrote:
>>
>>> I think I have an idea of what is happening to you, what happens that
>>> you must decrypt in the same format that you encrypted, since that happened
>>> to me at some point, you must also see the format in how you return the txt
>>> file, or the text of txt if it is the same format that is needed to decrypt
>>> it. Greetings.
>>>
>>> El lunes, 28 de noviembre de 2022 a las 14:30:04 UTC-5,
>>> [email protected] escribió:
>>>
>>>> Ok so based on the example from this link (
>>>> https://www.cryptopp.com/wiki/Advanced_Encryption_Standard), i have
>>>> tried encrypting a "plain" string into a "cipher" string and writing that
>>>> "cipher" string to a .txt file in one program, and in another program
>>>> afterwards reading that same .txt file into a string and decrypting it.
>>>> But
>>>> when i cout that "recovered" string, it is just random characters and not
>>>> my original "plain" string. I think the problem starts when i attempt to
>>>> get the "cipher" string in the .txt file, but not sure. Any help is
>>>> greatly
>>>> appreciated. Thanks in advance.
>>>
>>>
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