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#include <iostream>
#include <iomanip>
#include <exception>
#include <stdexcept>
using namespace std;
#include "openssl/evp.h"
#include "openssl/rsa.h"
#include "openssl/err.h"
void buffer_dump(const unsigned char* buffer, size_t size)
{
std::cout << hex;
for (unsigned int i=0; i<size; i++)
std::cout << (int) buffer[i] << " ";
std::cout << dec << endl;
}
size_t EVP_ENCRYPT(unsigned char* bufferOut, int sizeOutput, const unsigned char* bufferIn, int sizeInput)
{
EVP_CIPHER_CTX m_ctx;
char* key = new char[16];
::memset(key, 0, 16);
unsigned char* buffer = bufferOut;
size_t bufsize = 0;
EVP_CIPHER_CTX_init(&m_ctx);
EVP_EncryptInit_ex(&m_ctx, EVP_aes_256_cbc(), NULL, NULL, NULL);
EVP_CIPHER_CTX_set_key_length(&m_ctx, 16);
if (EVP_EncryptInit_ex(&m_ctx, NULL, NULL, (const unsigned char*) key, NULL) != 1)
std::cerr << "EVP_EncryptInit failed" << endl;
if (EVP_EncryptUpdate(&m_ctx, bufferOut, &sizeOutput, bufferIn, sizeInput) != 1)
std::cerr << "EVP_EncryptUpdate failed" << endl;
bufferOut += sizeOutput;
bufsize += sizeOutput;
if (EVP_EncryptFinal_ex(&m_ctx, bufferOut, &sizeOutput) != 1)
std::cerr << "EVP_EncryptFinal_ex failed" << endl;
bufsize += sizeOutput;
EVP_CIPHER_CTX_cleanup(&m_ctx);
buffer_dump(bufferOut, bufsize);
delete key;
return bufsize;
}
size_t EVP_DECRYPT(unsigned char* bufferOut, int sizeOutput, const unsigned char* bufferIn, int sizeInput)
{
EVP_CIPHER_CTX m_ctx;
char* key = new char[16];
::memset(key, 0, 16);
unsigned char* buffer = bufferOut;
size_t bufsize = 0;
EVP_CIPHER_CTX_init(&m_ctx);
EVP_DecryptInit_ex(&m_ctx, EVP_aes_256_cbc(), NULL, NULL, NULL);
EVP_CIPHER_CTX_set_key_length(&m_ctx, 16);
if (EVP_DecryptInit_ex(&m_ctx, NULL, NULL, (const unsigned char*) key, NULL) != 1)
std::cerr << "EVP_DecryptInit_ex failed" << endl;
if (EVP_DecryptUpdate(&m_ctx, bufferOut, &sizeOutput, bufferIn, sizeInput) != 1)
std::cerr << "EVP_DecryptUpdate failed" << endl;
bufferOut += sizeOutput;
bufsize += sizeOutput;
if (EVP_DecryptFinal_ex(&m_ctx, bufferOut, &sizeOutput) != 1)
std::cerr << "EVP_DecryptFinal_ex failed" << endl;
bufsize += sizeOutput;
EVP_CIPHER_CTX_cleanup(&m_ctx);
buffer_dump(bufferOut, bufsize);
delete key;
return bufsize;
}
int main(int argc, char* argv[])
{
const char* srctext = "TEST";
unsigned char* bufferIn;
unsigned char* bufferOut;
int sizeBuffer = 0;
int sizeOutput, sizeInput;
char encbuffer[32];
char decbuffer[32];
bufferIn = (unsigned char*)(srctext);
sizeInput = ::strlen(srctext);
bufferOut = (unsigned char*)(encbuffer);
sizeOutput = sizeof(encbuffer);
sizeBuffer = EVP_ENCRYPT(bufferOut, sizeOutput, bufferIn, sizeInput);
sizeBuffer = EVP_ENCRYPT(bufferOut, sizeOutput, bufferIn, sizeInput);
bufferIn = (unsigned char*)(encbuffer);
sizeInput = sizeBuffer;
bufferOut = (unsigned char*)(decbuffer);
sizeOutput = sizeof(decbuffer);
sizeBuffer = EVP_DECRYPT(bufferOut, sizeOutput, bufferIn, sizeInput);
} |
