Decrypt

[Valduis4]

I am trying to decrypt the encryption but it keeps encrypting further. Is there something I am missing?
`string sKey = "help";
string siv = "test";
uint8_t * key =(uint8_t *) sKey.c_str();
uint8_t * iv =(uint8_t *) siv.c_str();
ucstk::Salsa20 salsa20(key);
salsa20.setIv(iv);

string sinput = "help";
uint8_t * input =(uint8_t *) sinput.c_str();
// uint8_t * output;


salsa20.processBytes(input, input, sinput.size());

cout << "Output: "<< input << "\n";`

Output : )┴à┴

`string sKey = "help";
string siv = "test";
uint8_t * key =(uint8_t *) sKey.c_str();
uint8_t * iv =(uint8_t *) siv.c_str();
ucstk::Salsa20 salsa20(key);
salsa20.setIv(iv);

string sinput = ")┴à┴";
uint8_t * input =(uint8_t *) sinput.c_str();
// uint8_t * output;


salsa20.processBytes(input, input, sinput.size());

cout << "Output: "<< input << "\n";

`
Output: hF}♣╔┤‼0o

[everard]

Sorry for the late reply. Salsa's IV must be 8 bytes long, but you are using only 4 bytes for it, so you have Undefined Behavior in your code.

As a side note: this repo is really-really old, but there is a type-safe C++20 implementation of the Salsa stream cypher: https://github.com/everard/libecstk-crypto/blob/master/src/crypto_stream_salsa.hh
https://github.com/everard/libecstk-buffer/blob/master/src/buffer.hh