how to convert 'const char *' to 'const unsigned char *'

Question

how to convert 'const char *' to 'const unsigned char *'

 bool AES(const uint8_t *Data, size_t Size) {  
     std::string s(reinterpret_cast<const char *>(Data), Size);
     AES_cbc_encrypt(s.c_str(), enc_out, Size, &enc_key, iv, AES_ENCRYPT);
    }

the error got while compilation of the program

candidate function not viable: no known conversion from 'const char *' to 'const unsigned char *'
      for 1st argument
void AES_cbc_encrypt(const unsigned char *in, unsigned char *out,

I tried this doesn't work

std::string s(reinterpret_cast<const unsigned char *>(Data), Size);

Answer 1

uint8_t , if it's available , is just a typedef to unsigned char . Therefore, you can just do:

 bool AES(const uint8_t *Data, size_t Size) {  
     AES_cbc_encrypt(Data, enc_out, Size, &enc_key, iv, AES_ENCRYPT);
 }

Note that you should probably return something in your function as well.