The thing is operator<< is used for formatted text output, not binary. https://en.cppreference.com/w/cpp/io/basic_ostream/operator_ltlt https://en.cppreference.com/w/cpp/named_req/FormattedOutputFunction
There are read/write functions to deal with binary files. https://en.cppreference.com/w/cpp/io/basic_ostream/write Since you get binary data after encryption, you must open file in binary mode and use write() to put binary data to file. FileSink with binary=true does exactly what you need. If you still want to play with text, look at HexEncoder & HexDecoder filters https://cryptopp.com/wiki/HexDecoder среда, 30 ноября 2022 г. в 03:19:24 UTC+7, boomer1...@gmail.com: > Ok nevermind i figured it out. For anyone in the future having the same > problem, here is a stackoverflow post solving my situation: > https://stackoverflow.com/questions/30633594/c-convert-hexadecimal-string-with-to-original-binary-string > > .Thanks a lot for the answers, the format thing you said helped a lot. > > On Tuesday, November 29, 2022 at 8:35:16 PM UTC+2 Nikos Karavidas wrote: > >> Ok so i got this figured out with this: >> >> stringstream ss; >> >> for (int i = 0; i < ciphertext.size(); ++i) >> { >> ss << hex << (0xFF & static_cast<byte>(ciphertext[i])) << " "; >> } >> >> string mystr = ss.str(); >> >> cout << "mystr: " << mystr << endl; >> >> >> and it works fine, all characters are printed in hex and i can write them >> in a txt file, no problem. BUT when i read them from the txt file, i dont >> know how to convert them back from hex, so i can do the decryption. >> On Tuesday, November 29, 2022 at 8:23:19 PM UTC+2 Nikos Karavidas wrote: >> >>> 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 schmid...@gmail.com >>> 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, boomer1...@gmail.com: >>>> >>>>> 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 creyesc...@gmail.com >>>>> 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, >>>>>> boomer1...@gmail.com 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. >>>>>> >>>>>> -- You received this message because you are subscribed to the Google Groups "Crypto++ Users" group. 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