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AES.cpp
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AES.cpp
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//
// Created by archie on 3/29/17.
//
#include <openssl/crypto.h>
#include <openssl/evp.h>
#include <openssl/err.h>
#include <memory>
#include <limits>
#include "AES.h"
#include <iomanip>
#include <sstream>
#include <vector>
//From https://wiki.openssl.org/index.php/EVP_Symmetric_Encryption_and_Decryption
template <typename T>
struct zallocator
{
public:
typedef T value_type;
typedef value_type* pointer;
typedef const value_type* const_pointer;
typedef value_type& reference;
typedef const value_type& const_reference;
typedef std::size_t size_type;
typedef std::ptrdiff_t difference_type;
pointer address (reference v) const {return &v;}
const_pointer address (const_reference v) const {return &v;}
pointer allocate (size_type n, const void* hint = 0) {
if (n > std::numeric_limits<size_type>::max() / sizeof(T))
throw std::bad_alloc();
return static_cast<pointer> (::operator new (n * sizeof (value_type)));
}
void deallocate(pointer p, size_type n) {
OPENSSL_cleanse(p, n*sizeof(T));
::operator delete(p);
}
size_type max_size() const {
return std::numeric_limits<size_type>::max() / sizeof (T);
}
template<typename U>
struct rebind
{
typedef zallocator<U> other;
};
void construct (pointer ptr, const T& val) {
new (static_cast<T*>(ptr) ) T (val);
}
void destroy(pointer ptr) {
static_cast<T*>(ptr)->~T();
}
#if __cpluplus >= 201103L
template<typename U, typename... Args>
void construct (U* ptr, Args&& ... args) {
::new (static_cast<void*> (ptr) ) U (std::forward<Args> (args)...);
}
template<typename U>
void destroy(U* ptr) {
ptr->~U();
}
#endif
};
//End From https://wiki.openssl.org/index.php/EVP_Symmetric_Encryption_and_Decryption
typedef unsigned char byte;
typedef std::basic_string<char, std::char_traits<char>, zallocator<char> > secure_string;
using EVP_CIPHER_CTX_free_ptr = std::unique_ptr<EVP_CIPHER_CTX, decltype(&::EVP_CIPHER_CTX_free)>;
AES::AES() {
EVP_add_cipher(EVP_aes_256_cbc());
}
//Kod z https://wiki.openssl.org/index.php/EVP_Symmetric_Encryption_and_Decryption
string AES::encrypt(string msg) {
secure_string ptext(msg.c_str());
secure_string ctext;
EVP_CIPHER_CTX_free_ptr ctx(EVP_CIPHER_CTX_new(), ::EVP_CIPHER_CTX_free);
int rc = EVP_EncryptInit_ex(ctx.get(), EVP_aes_256_cbc(), NULL, (const unsigned char *) key.c_str(),
(const unsigned char *) initVector.c_str());
if (rc != 1)
throw std::runtime_error("EVP_EncryptInit_ex failed");
// Recovered text expands upto BLOCK_SIZE
ctext.resize(ptext.size()+BLOCK_SIZE);
int out_len1 = (int)ctext.size();
rc = EVP_EncryptUpdate(ctx.get(), (byte*)&ctext[0], &out_len1, (const byte*)&ptext[0], (int)ptext.size());
if (rc != 1)
throw std::runtime_error("EVP_EncryptUpdate failed");
int out_len2 = (int)ctext.size() - out_len1;
rc = EVP_EncryptFinal_ex(ctx.get(), (byte*)&ctext[0]+out_len1, &out_len2);
if (rc != 1)
throw std::runtime_error("EVP_EncryptFinal_ex failed");
// Set cipher text size now that we know it
ctext.resize(out_len1 + out_len2);
//Konverzia z char na pole int - odstranenie nutnosti escapovana znakov
stringstream ss;
for(int i = 0; i < ctext.size(); i++) {
int test = ctext[i];
ss << test << " ";
cerr << test << " ";
}
cerr << endl;
cerr << ss.str() << endl;
string result(ss.str());
cerr << "Result = " << result << endl;
return result;
}
//Kod z https://wiki.openssl.org/index.php/EVP_Symmetric_Encryption_and_Decryption
string AES::decrypt(string msg) {
//Konverzia z int na pole char - odstranenie nutnosti escapovana znakov
secure_string ctext(msg.c_str());
secure_string rtext;
stringstream in(msg);
int countOfChars = 0;
int integer = 0;
while(in >> integer) {
cerr << integer << " ";
ctext[countOfChars] = integer;
countOfChars++;
}
cerr << endl;
ctext.resize(countOfChars);
EVP_CIPHER_CTX_free_ptr ctx(EVP_CIPHER_CTX_new(), ::EVP_CIPHER_CTX_free);
int rc = EVP_DecryptInit_ex(ctx.get(), EVP_aes_256_cbc(), NULL, (const unsigned char *) key.c_str(),
(const unsigned char *) initVector.c_str());
if (rc != 1)
throw std::runtime_error("EVP_DecryptInit_ex failed");
// Recovered text contracts upto BLOCK_SIZE
rtext.resize(ctext.size());
int out_len1 = (int)rtext.size();
rc = EVP_DecryptUpdate(ctx.get(), (byte*)&rtext[0], &out_len1, (const byte*)&ctext[0], (int)ctext.size());
if (rc != 1)
throw std::runtime_error("EVP_DecryptUpdate failed");
int out_len2 = (int)rtext.size() - out_len1;
rc = EVP_DecryptFinal_ex(ctx.get(), (byte*)&rtext[0]+out_len1, &out_len2);
if (rc != 1){
ERR_print_errors_fp(stderr);
throw std::runtime_error("EVP_DecryptFinal_ex failed");
}
// Set recovered text size now that we know it
rtext.resize(out_len1 + out_len2);
string result(rtext.c_str());
return result;
}
void AES::setKey(const string &key) {
AES::key = key;
}
void AES::setInitVector(const string &initVector) {
AES::initVector = initVector;
}