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passage en objet fini mais segfault

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antoine 2016-01-20 20:25:02 +01:00
parent ce9c44583c
commit a96729198f
15 changed files with 978 additions and 229 deletions
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1
.idea/.name generated Normal file
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aes

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8
CMakeLists.txt Normal file
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cmake_minimum_required(VERSION 3.3)
project(aes)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -Wall -Wextra -ggdb -lcrypto")
include_directories("/usr/include/openssl/")
set(SOURCE_FILES aes.cpp)
add_executable(crypto.ex ${SOURCE_FILES})

285
aes.cpp
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@ -1,256 +1,83 @@
#include <openssl/evp.h>
#include <openssl/pem.h>
#include <openssl/aes.h>
#include <openssl/err.h>
#include <openssl/rand.h>
#include <iostream>
#include <stdio.h>
#include <string>
#include <string.h>
#define FAILURE -1
#define SUCCESS 0
#define AES_KEYLEN 256
#define AES_ROUNDS 6
int aesDecrypt(EVP_CIPHER_CTX* aesDecryptCtx, unsigned char* aesKey, unsigned char* aesIV, unsigned char *encMsg, size_t encMsgLen, unsigned char **decMsg) {
size_t decLen = 0;
size_t blockLen = 0;
*decMsg = (unsigned char*)malloc(encMsgLen);
if(*decMsg == NULL) return FAILURE;
if(!EVP_DecryptInit_ex(aesDecryptCtx, EVP_aes_256_cbc(), NULL, aesKey, aesIV)) {
return FAILURE;
}
if(!EVP_DecryptUpdate(aesDecryptCtx, (unsigned char*)*decMsg, (int*)&blockLen, encMsg, (int)encMsgLen)) {
return FAILURE;
}
decLen += blockLen;
if(!EVP_DecryptFinal_ex(aesDecryptCtx, (unsigned char*)*decMsg + decLen, (int*)&blockLen)) {
return FAILURE;
}
decLen += blockLen;
EVP_CIPHER_CTX_cleanup(aesDecryptCtx);
return (int)decLen;
}
int aesEncrypt(EVP_CIPHER_CTX* aesEncryptCtx, unsigned char* aesKey, unsigned char* aesIV, const unsigned char *msg, size_t msgLen, unsigned char **encMsg) {
size_t blockLen = 0;
size_t encMsgLen = 0;
*encMsg = (unsigned char*)malloc(msgLen + AES_BLOCK_SIZE);
if(encMsg == NULL) return FAILURE;
if(!EVP_EncryptInit_ex(aesEncryptCtx, EVP_aes_256_cbc(), NULL, aesKey, aesIV)) {
return FAILURE;
}
if(!EVP_EncryptUpdate(aesEncryptCtx, *encMsg, (int*)&blockLen, (unsigned char*)msg, msgLen)) {
return FAILURE;
}
encMsgLen += blockLen;
if(!EVP_EncryptFinal_ex(aesEncryptCtx, *encMsg + encMsgLen, (int*)&blockLen)) {
return FAILURE;
}
EVP_CIPHER_CTX_cleanup(aesEncryptCtx);
return encMsgLen + blockLen;
}
void clear_all(EVP_CIPHER_CTX* aesEncryptCtx, EVP_CIPHER_CTX* aesDecryptCtx, unsigned char* aesKey, unsigned char* aesIV) {
EVP_CIPHER_CTX_cleanup(aesEncryptCtx);
EVP_CIPHER_CTX_cleanup(aesDecryptCtx);
free(aesEncryptCtx);
free(aesDecryptCtx);
free(aesIV);
free(aesKey);
}
void init_all(EVP_CIPHER_CTX* aesEncryptCtx, EVP_CIPHER_CTX* aesDecryptCtx, unsigned char* aesKey, unsigned char* aesIV) {
EVP_CIPHER_CTX_init(aesEncryptCtx);
EVP_CIPHER_CTX_init(aesDecryptCtx);
unsigned char *aesPass = (unsigned char*)malloc(AES_KEYLEN/8);
unsigned char *aesSalt = (unsigned char*)malloc(8);
if(aesKey == NULL || aesIV == NULL || aesPass == NULL || aesSalt == NULL) {
exit(FAILURE);
}
#define USE_PBKDF
#ifdef USE_PBKDF
std::cerr << "utilisation de USE_PBKDF" << std::endl;
// Get some random data to use as the AES pass and salt
if(RAND_bytes(aesPass, AES_KEYLEN/8) == 0) {
exit(FAILURE);
}
if(RAND_bytes(aesSalt, 8) == 0) {
exit(FAILURE);
}
if(EVP_BytesToKey(EVP_aes_256_cbc(), EVP_sha256(), aesSalt, aesPass, AES_KEYLEN/8, AES_ROUNDS, aesKey, aesIV) == 0) {
exit(FAILURE);
}
#else
if(RAND_bytes(aesKey, AES_KEYLEN/8) == 0) {
exit(FAILURE);
}
if(RAND_bytes(aesIV, AES_KEYLEN/8) == 0) {
exit(FAILURE);
}
#endif
free(aesPass);
free(aesSalt);
}
void writeFile(char *filename, unsigned char *file, size_t fileLength) {
FILE *fd = fopen(filename, "wb");
if(fd == NULL) {
fprintf(stderr, "Failed to open file: %s\n", strerror(errno));
exit(1);
}
size_t bytesWritten = fwrite(file, 1, fileLength, fd);
if(bytesWritten != fileLength) {
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exit(1);
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fclose(fd);
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fprintf(stderr, "Failed to open file: %s\n", strerror(errno));
exit(1);
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fseek(fd, 0, SEEK_SET);
// Allocate space for the file
*file = (unsigned char*)malloc(fileLength);
if(*file == NULL) {
fprintf(stderr, "Failed to allocate memory\n");
exit(1);
}
// Read the file into the buffer
size_t bytesRead = fread(*file, 1, fileLength, fd);
if(bytesRead != fileLength) {
fprintf(stderr, "Error reading file\n");
exit(1);
}
fclose(fd);
return fileLength;
}
#include "aes.hpp"
#include "crypt.hpp"
#include "decrypt.hpp"
int main(int argc, char* argv[]) {
if(argc != 2) {
fprintf(stderr, "No file argument supplied.\n");
std::cerr << "No file argument supplied.\n";
return 1;
}
EVP_CIPHER_CTX* aesEncryptCtx = (EVP_CIPHER_CTX*)malloc(sizeof(EVP_CIPHER_CTX));
EVP_CIPHER_CTX* aesDecryptCtx = (EVP_CIPHER_CTX*)malloc(sizeof(EVP_CIPHER_CTX));
if(aesDecryptCtx == NULL || aesEncryptCtx == NULL) {
return FAILURE;
}
unsigned char* aesKey = (unsigned char*)malloc(AES_KEYLEN/8);
unsigned char* aesIV = (unsigned char*)malloc(AES_KEYLEN/8);
init_all(aesEncryptCtx, aesDecryptCtx, aesKey, aesIV);
//***************************************************
char* filename = argv[1];
aes O = crypt(filename);
// Read the file to encrypt
unsigned char *file;
size_t fileLength = readFile(filename, &file);
// readFile fait l'aloccation mémoire !!! pensé au free
size_t fileLength = O.readFile(&file);
printf("%d bytes to be encrypted\n", (int)fileLength);
// Encrypt the file
unsigned char *encryptedFile;
int encryptedFileLength;
if((encryptedFileLength = aesEncrypt(aesEncryptCtx, aesKey, aesIV, (const unsigned char*)file, fileLength, &encryptedFile)) == -1) {
fprintf(stderr, "Encryption failed\n");
return 1;
}
printf("%d bytes encrypted\n", encryptedFileLength);
// Append .enc to the filename
char *encryptedFilename = (char*)malloc(strlen(filename) + 5);
if(encryptedFilename == NULL) {
fprintf(stderr, "Failed to allocate memory\n");
return 1;
}
sprintf(encryptedFilename, "%s.enc", filename);
// Write the encrypted file to its own file
writeFile(encryptedFilename, encryptedFile, encryptedFileLength);
std::cerr << "aesKey : ";
for (int i = 0; i < 32; i++) {
std::cerr << std::hex << aesKey[i];
}
std::cerr << std::endl;
crypt temp = static_cast<crypt>(O);
// if((encryptedFileLength = (temp).aesEncrypt((const unsigned char*)file, fileLength, &encryptedFile) ) == -1) {
// fprintf(stderr, "Encryption failed\n");
// return 1;
// }
// printf("%d bytes encrypted\n", encryptedFileLength);
printf("Encrypted message written to \"%s\"\n", encryptedFilename);
// // Append .enc to the filename
// char *encryptedFilename = (char*)malloc(strlen(filename) + 5);
// if(encryptedFilename == NULL) {
// fprintf(stderr, "Failed to allocate memory\n");
// return 1;
// }
// sprintf(encryptedFilename, "%s.enc", filename);
// // Write the encrypted file to its own file
// writeFile(encryptedFilename, encryptedFile, encryptedFileLength);
// std::cerr << "aesKey : ";
// for (int i = 0; i < 32; i++) {
// std::cerr << std::hex << aesKey[i];
// }
// std::cerr << std::endl;
// printf("Encrypted message written to \"%s\"\n", encryptedFilename);
free(file);
//***************************************************
// //***************************************************
fileLength = readFile(encryptedFilename, &file);
// fileLength = readFile(encryptedFilename, &file);
// Decrypt the encrypted file
unsigned char *decryptedFile;
int decryptedFileLength;
if((decryptedFileLength = aesDecrypt(aesDecryptCtx, aesKey, aesIV, file, fileLength, &decryptedFile)) == -1) {
fprintf(stderr, "Decryption failed\n");
return 1;
}
printf("%d bytes decrypted\n", (int)decryptedFileLength);
// // Decrypt the encrypted file
// unsigned char *decryptedFile;
// int decryptedFileLength;
// if((decryptedFileLength = aesDecrypt(aesDecryptCtx, aesKey, aesIV, file, fileLength, &decryptedFile)) == -1) {
// fprintf(stderr, "Decryption failed\n");
// return 1;
// }
// printf("%d bytes decrypted\n", (int)decryptedFileLength);
// Append .dec to the filename
char *decryptedFilename = (char*)malloc(strlen(filename) + 5);
if(decryptedFilename == NULL) {
fprintf(stderr, "Failed to allocate memory\n");
return 1;
}
sprintf(decryptedFilename, "%s.dec", filename);
// // Append .dec to the filename
// char *decryptedFilename = (char*)malloc(strlen(filename) + 5);
// if(decryptedFilename == NULL) {
// fprintf(stderr, "Failed to allocate memory\n");
// return 1;
// }
// sprintf(decryptedFilename, "%s.dec", filename);
// Write the decrypted file to its own file
writeFile(decryptedFilename, decryptedFile, decryptedFileLength);
printf("Decrypted file written to \"%s\"\n", decryptedFilename);
// // Write the decrypted file to its own file
// writeFile(decryptedFilename, decryptedFile, decryptedFileLength);
// printf("Decrypted file written to \"%s\"\n", decryptedFilename);
free(decryptedFile);
free(file);
// free(decryptedFile);
// free(file);
//***************************************************
clear_all(aesEncryptCtx, aesDecryptCtx, aesKey, aesIV);
return 0;
}

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#include <iostream>
#include <stdio.h>
#include <string>
#include <string.h>
#include <openssl/evp.h>
#include <openssl/pem.h>
#include <openssl/aes.h>
#include <openssl/err.h>
#include <openssl/rand.h>
#define FAILURE -1
#define SUCCESS 0
#define AES_KEYLEN 256
#define AES_ROUNDS 6
int aesDecrypt(EVP_CIPHER_CTX* aesDecryptCtx, unsigned char* aesKey, unsigned char* aesIV, unsigned char *encMsg, size_t encMsgLen, unsigned char **decMsg) {
size_t decLen = 0;
size_t blockLen = 0;
*decMsg = (unsigned char*)malloc(encMsgLen);
if(*decMsg == NULL) return FAILURE;
if(!EVP_DecryptInit_ex(aesDecryptCtx, EVP_aes_256_cbc(), NULL, aesKey, aesIV)) {
return FAILURE;
}
if(!EVP_DecryptUpdate(aesDecryptCtx, (unsigned char*)*decMsg, (int*)&blockLen, encMsg, (int)encMsgLen)) {
return FAILURE;
}
decLen += blockLen;
if(!EVP_DecryptFinal_ex(aesDecryptCtx, (unsigned char*)*decMsg + decLen, (int*)&blockLen)) {
return FAILURE;
}
decLen += blockLen;
EVP_CIPHER_CTX_cleanup(aesDecryptCtx);
return (int)decLen;
}
int aesEncrypt(EVP_CIPHER_CTX* aesEncryptCtx, unsigned char* aesKey, unsigned char* aesIV, const unsigned char *msg, size_t msgLen, unsigned char **encMsg) {
size_t blockLen = 0;
size_t encMsgLen = 0;
*encMsg = (unsigned char*)malloc(msgLen + AES_BLOCK_SIZE);
if(encMsg == NULL) return FAILURE;
if(!EVP_EncryptInit_ex(aesEncryptCtx, EVP_aes_256_cbc(), NULL, aesKey, aesIV)) {
return FAILURE;
}
if(!EVP_EncryptUpdate(aesEncryptCtx, *encMsg, (int*)&blockLen, (unsigned char*)msg, msgLen)) {
return FAILURE;
}
encMsgLen += blockLen;
if(!EVP_EncryptFinal_ex(aesEncryptCtx, *encMsg + encMsgLen, (int*)&blockLen)) {
return FAILURE;
}
EVP_CIPHER_CTX_cleanup(aesEncryptCtx);
return encMsgLen + blockLen;
}
void clear_all(EVP_CIPHER_CTX* aesEncryptCtx, EVP_CIPHER_CTX* aesDecryptCtx, unsigned char* aesKey, unsigned char* aesIV) {
EVP_CIPHER_CTX_cleanup(aesEncryptCtx);
EVP_CIPHER_CTX_cleanup(aesDecryptCtx);
free(aesEncryptCtx);
free(aesDecryptCtx);
free(aesIV);
free(aesKey);
}
void init_all(EVP_CIPHER_CTX* aesEncryptCtx, EVP_CIPHER_CTX* aesDecryptCtx, unsigned char* aesKey, unsigned char* aesIV) {
EVP_CIPHER_CTX_init(aesEncryptCtx);
EVP_CIPHER_CTX_init(aesDecryptCtx);
unsigned char *aesPass = (unsigned char*)malloc(AES_KEYLEN/8);
unsigned char *aesSalt = (unsigned char*)malloc(8);
if(aesKey == NULL || aesIV == NULL || aesPass == NULL || aesSalt == NULL) {
exit(FAILURE);
}
#define USE_PBKDF
#ifdef USE_PBKDF
std::cerr << "utilisation de USE_PBKDF" << std::endl;
// Get some random data to use as the AES pass and salt
if(RAND_bytes(aesPass, AES_KEYLEN/8) == 0) {
exit(FAILURE);
}
if(RAND_bytes(aesSalt, 8) == 0) {
exit(FAILURE);
}
if(EVP_BytesToKey(EVP_aes_256_cbc(), EVP_sha256(), aesSalt, aesPass, AES_KEYLEN/8, AES_ROUNDS, aesKey, aesIV) == 0) {
exit(FAILURE);
}
#else
if(RAND_bytes(aesKey, AES_KEYLEN/8) == 0) {
exit(FAILURE);
}
if(RAND_bytes(aesIV, AES_KEYLEN/8) == 0) {
exit(FAILURE);
}
#endif
free(aesPass);
free(aesSalt);
}
void writeFile(char *filename, unsigned char *file, size_t fileLength) {
FILE *fd = fopen(filename, "wb");
if(fd == NULL) {
fprintf(stderr, "Failed to open file: %s\n", strerror(errno));
exit(1);
}
size_t bytesWritten = fwrite(file, 1, fileLength, fd);
if(bytesWritten != fileLength) {
fprintf(stderr, "Failed to write file\n");
exit(1);
}
fclose(fd);
}
int readFile(char *filename, unsigned char **file) {
FILE *fd = fopen(filename, "rb");
if(fd == NULL) {
fprintf(stderr, "Failed to open file: %s\n", strerror(errno));
exit(1);
}
// Determine size of the file
fseek(fd, 0, SEEK_END);
size_t fileLength = ftell(fd);
fseek(fd, 0, SEEK_SET);
// Allocate space for the file
*file = (unsigned char*)malloc(fileLength);
if(*file == NULL) {
fprintf(stderr, "Failed to allocate memory\n");
exit(1);
}
// Read the file into the buffer
size_t bytesRead = fread(*file, 1, fileLength, fd);
if(bytesRead != fileLength) {
fprintf(stderr, "Error reading file\n");
exit(1);
}
fclose(fd);
return fileLength;
}
int main(int argc, char* argv[]) {
if(argc != 2) {
fprintf(stderr, "No file argument supplied.\n");
return 1;
}
EVP_CIPHER_CTX* aesEncryptCtx = (EVP_CIPHER_CTX*)malloc(sizeof(EVP_CIPHER_CTX));
EVP_CIPHER_CTX* aesDecryptCtx = (EVP_CIPHER_CTX*)malloc(sizeof(EVP_CIPHER_CTX));
if(aesDecryptCtx == NULL || aesEncryptCtx == NULL) {
return FAILURE;
}
unsigned char* aesKey = (unsigned char*)malloc(AES_KEYLEN/8);
unsigned char* aesIV = (unsigned char*)malloc(AES_KEYLEN/8);
init_all(aesEncryptCtx, aesDecryptCtx, aesKey, aesIV);
//***************************************************
char* filename = argv[1];
// Read the file to encrypt
unsigned char *file;
size_t fileLength = readFile(filename, &file);
printf("%d bytes to be encrypted\n", (int)fileLength);
// Encrypt the file
unsigned char *encryptedFile;
int encryptedFileLength;
if((encryptedFileLength = aesEncrypt(aesEncryptCtx, aesKey, aesIV, (const unsigned char*)file, fileLength, &encryptedFile)) == -1) {
fprintf(stderr, "Encryption failed\n");
return 1;
}
printf("%d bytes encrypted\n", encryptedFileLength);
// Append .enc to the filename
char *encryptedFilename = (char*)malloc(strlen(filename) + 5);
if(encryptedFilename == NULL) {
fprintf(stderr, "Failed to allocate memory\n");
return 1;
}
sprintf(encryptedFilename, "%s.enc", filename);
// Write the encrypted file to its own file
writeFile(encryptedFilename, encryptedFile, encryptedFileLength);
std::cerr << "aesKey : ";
for (int i = 0; i < 32; i++) {
std::cerr << std::hex << aesKey[i];
}
std::cerr << std::endl;
printf("Encrypted message written to \"%s\"\n", encryptedFilename);
free(file);
//***************************************************
fileLength = readFile(encryptedFilename, &file);
// Decrypt the encrypted file
unsigned char *decryptedFile;
int decryptedFileLength;
if((decryptedFileLength = aesDecrypt(aesDecryptCtx, aesKey, aesIV, file, fileLength, &decryptedFile)) == -1) {
fprintf(stderr, "Decryption failed\n");
return 1;
}
printf("%d bytes decrypted\n", (int)decryptedFileLength);
// Append .dec to the filename
char *decryptedFilename = (char*)malloc(strlen(filename) + 5);
if(decryptedFilename == NULL) {
fprintf(stderr, "Failed to allocate memory\n");
return 1;
}
sprintf(decryptedFilename, "%s.dec", filename);
// Write the decrypted file to its own file
writeFile(decryptedFilename, decryptedFile, decryptedFileLength);
printf("Decrypted file written to \"%s\"\n", decryptedFilename);
free(decryptedFile);
free(file);
//***************************************************
clear_all(aesEncryptCtx, aesDecryptCtx, aesKey, aesIV);
return 0;
}

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#ifndef _AES
#define _AES
#include <iostream>
#include <stdio.h>
#include <string>
#include <string.h>
#include <openssl/evp.h>
#include <openssl/pem.h>
#include <openssl/aes.h>
#include <openssl/err.h>
#include <openssl/rand.h>
#define FAILURE -1
#define SUCCESS 0
#define AES_KEYLEN 256
#define AES_ROUNDS 6
class aes {
protected:
unsigned char* aesKey;
unsigned char* aesIV;
private:
std::string filename;
public:
aes(std::string _filename);
aes(const aes& _e);
void init_all();
void writeFile(unsigned char *file, size_t fileLength);
int readFile(unsigned char **file);
void clear_all();
~aes();
};
aes::aes(std::string _filename) {
filename = _filename;
aesKey = (unsigned char*)malloc(AES_KEYLEN/8);
aesIV = (unsigned char*)malloc(AES_KEYLEN/8);
}
aes::aes(const aes& _e) : filename(_e.filename) {
std::cerr << "salut\n";
}
void aes::init_all() {
unsigned char *aesPass = (unsigned char*)malloc(AES_KEYLEN/8);
unsigned char *aesSalt = (unsigned char*)malloc(8);
if(aesKey == NULL || aesIV == NULL || aesPass == NULL || aesSalt == NULL) {
exit(FAILURE);
}
#define USE_PBKDF
#ifdef USE_PBKDF
std::cerr << "utilisation de USE_PBKDF" << std::endl;
// Get some random data to use as the AES pass and salt
if(RAND_bytes(aesPass, AES_KEYLEN/8) == 0) {
exit(FAILURE);
}
if(RAND_bytes(aesSalt, 8) == 0) {
exit(FAILURE);
}
if(EVP_BytesToKey(EVP_aes_256_cbc(), EVP_sha256(), aesSalt, aesPass, AES_KEYLEN/8, AES_ROUNDS, aesKey, aesIV) == 0) {
exit(FAILURE);
}
#else
if(RAND_bytes(aesKey, AES_KEYLEN/8) == 0) {
exit(FAILURE);
}
if(RAND_bytes(aesIV, AES_KEYLEN/8) == 0) {
exit(FAILURE);
}
#endif
free(aesPass);
free(aesSalt);
}
// peut être déporté le buffer lut avec methode pour travaillé dessus
int aes::readFile(unsigned char **file) {
FILE *fd = fopen(filename.c_str(), "rb");
if(fd == NULL) {
fprintf(stderr, "Failed to open file: %s\n", strerror(errno));
exit(1);
}
// Determine size of the file
fseek(fd, 0, SEEK_END);
size_t fileLength = ftell(fd);
fseek(fd, 0, SEEK_SET);
// Allocate space for the file
*file = (unsigned char*)malloc(fileLength);
if(*file == NULL) {
fprintf(stderr, "Failed to allocate memory\n");
exit(1);
}
// Read the file into the buffer
size_t bytesRead = fread(*file, 1, fileLength, fd);
if(bytesRead != fileLength) {
fprintf(stderr, "Error reading file\n");
exit(1);
}
fclose(fd);
return fileLength;
}
void aes::writeFile(unsigned char *file, size_t fileLength) {
FILE *fd = fopen(filename.c_str(), "wb");
if(fd == NULL) {
fprintf(stderr, "Failed to open file: %s\n", strerror(errno));
exit(1);
}
size_t bytesWritten = fwrite(file, 1, fileLength, fd);
if(bytesWritten != fileLength) {
fprintf(stderr, "Failed to write file\n");
exit(1);
}
fclose(fd);
}
void aes::clear_all() {
free(aesIV);
free(aesKey);
}
aes::~aes() {}
#endif

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#ifndef _CRYPT
#define _CRYPT
#include "aes.hpp"
class crypt : public aes {
private:
EVP_CIPHER_CTX* aesEncryptCtx;
public:
crypt(std::string filename);
crypt(const aes& a);
void init_all();
int aesEncrypt(const unsigned char *msg, size_t msgLen, unsigned char **encMsg);
~crypt();
};
crypt::crypt(std::string filename) : aes(filename) {
aesEncryptCtx = (EVP_CIPHER_CTX*)malloc(sizeof(EVP_CIPHER_CTX));
if(aesEncryptCtx == NULL) {
exit(FAILURE);
}
init_all();
}
crypt::crypt(const aes& _a) : aes(_a) {
aesEncryptCtx = (EVP_CIPHER_CTX*)malloc(sizeof(EVP_CIPHER_CTX));
if(aesEncryptCtx == NULL) {
exit(FAILURE);
}
int res = EVP_CIPHER_CTX_copy(aesEncryptCtx, static_cast<crypt>(_a).aesEncryptCtx);
if(!res)
exit(FAILURE);
// *aesEncryptCtx = (*(static_cast<crypt>(_a)).aesEncryptCtx);
}
void crypt::init_all() {
aes::init_all();
EVP_CIPHER_CTX_init(aesEncryptCtx);
}
int crypt::aesEncrypt(const unsigned char *msg, size_t msgLen, unsigned char **encMsg) {
size_t blockLen = 0;
size_t encMsgLen = 0;
*encMsg = (unsigned char*)malloc(msgLen + AES_BLOCK_SIZE);
if(encMsg == NULL) return FAILURE;
if(!EVP_EncryptInit_ex(aesEncryptCtx, EVP_aes_256_cbc(), NULL, aes::aesKey, aes::aesIV)) {
return FAILURE;
}
if(!EVP_EncryptUpdate(aesEncryptCtx, *encMsg, (int*)&blockLen, (unsigned char*)msg, msgLen)) {
return FAILURE;
}
encMsgLen += blockLen;
if(!EVP_EncryptFinal_ex(aesEncryptCtx, *encMsg + encMsgLen, (int*)&blockLen)) {
return FAILURE;
}
EVP_CIPHER_CTX_cleanup(aesEncryptCtx);
return encMsgLen + blockLen;
}
crypt::~crypt() {
aes::clear_all();
EVP_CIPHER_CTX_cleanup(aesEncryptCtx);
free(aesEncryptCtx);
}
#endif

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#ifndef _DECRYPT
#define _DECRYPT
#include "aes.hpp"
class decrypt : public aes {
private:
EVP_CIPHER_CTX* aesDecryptCtx;
public:
decrypt(std::string filename);
decrypt(const aes& a);
void init_all();
int aesDecrypt(unsigned char *encMsg, size_t encMsgLen, unsigned char **decMsg);
~decrypt();
};
decrypt::decrypt(std::string filename) : aes(filename) {
aesDecryptCtx = (EVP_CIPHER_CTX*)malloc(sizeof(EVP_CIPHER_CTX));
if(aesDecryptCtx == NULL) {
exit(FAILURE);
}
init_all();
}
decrypt::decrypt(const aes& _a) : aes(_a) {
aesDecryptCtx = (EVP_CIPHER_CTX*)malloc(sizeof(EVP_CIPHER_CTX));
if(aesDecryptCtx == NULL) {
exit(FAILURE);
}
*aesDecryptCtx = (*(static_cast<decrypt>(_a)).aesDecryptCtx);
}
void decrypt::init_all() {
aes::init_all();
EVP_CIPHER_CTX_init(aesDecryptCtx);
}
int decrypt::aesDecrypt(unsigned char *encMsg, size_t encMsgLen, unsigned char **decMsg) {
size_t decLen = 0;
size_t blockLen = 0;
*decMsg = (unsigned char*)malloc(encMsgLen);
if(*decMsg == NULL) return FAILURE;
if(!EVP_DecryptInit_ex(aesDecryptCtx, EVP_aes_256_cbc(), NULL, aes::aesKey, aes::aesIV)) {
return FAILURE;
}
if(!EVP_DecryptUpdate(aesDecryptCtx, (unsigned char*)*decMsg, (int*)&blockLen, encMsg, (int)encMsgLen)) {
return FAILURE;
}
decLen += blockLen;
if(!EVP_DecryptFinal_ex(aesDecryptCtx, (unsigned char*)*decMsg + decLen, (int*)&blockLen)) {
return FAILURE;
}
decLen += blockLen;
EVP_CIPHER_CTX_cleanup(aesDecryptCtx);
return (int)decLen;
}
decrypt::~decrypt() {
aes::clear_all();
EVP_CIPHER_CTX_cleanup(aesDecryptCtx);
free(aesDecryptCtx);
}
#endif

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@ -1,5 +1,7 @@
main:
@g++ -Wall -Wextra -ggdb -o crypto.ex aes.cpp -lcrypto
run:
@./crypto.ex file.txt
clean: