C++ Openssl AES GCM 128bits代码示例，可wins10的visual studio 2017 中直接运行

C++ Openssl AES GCM 128bits代码示例，可wins直接运行

使用vcpkg安装64bits的openssl，本人当前的openssl为openssl-1.1.1d版本，wins10系统，使用visual studio2017编辑器

注意事项：如果使用Openssl 1.0的版本，需要使用EVP_CIPHER_CTX ctx;来定义ctx对象。具体看下面链接：https://github.com/openssl/openssl/issues/962

执行结果：

下面代码有两个版本，第一个是基础的没经过速度优化的但比较适合阅读的。第二个是为了性能特意优化了。

代码：

//g++ main.cpp -lcrypto#include <openssl/aes.h>
#include <openssl/evp.h>
#include <openssl/rand.h>
#include <openssl/ssl.h>
#include <string>
#include <sstream>
#include <vector>
#include <iostream>using std::string;
using std::vector;
using std::cout;
using std::endl;void aes_init()
{static int init = 0;if (init == 0){EVP_CIPHER_CTX * e_ctx = EVP_CIPHER_CTX_new();EVP_CIPHER_CTX *d_ctx = EVP_CIPHER_CTX_new();//initialize openssl ciphersOpenSSL_add_all_ciphers();//initialize random number generator (for IVs)int rv = RAND_load_file("/dev/urandom", 32);EVP_CIPHER_CTX_free(e_ctx);EVP_CIPHER_CTX_free(d_ctx);}
}std::vector<unsigned char> aes_128_gcm_encrypt(std::string plaintext, std::string key)
{aes_init();size_t enc_length = plaintext.length() * 3;std::vector<unsigned char> output;output.resize(enc_length, '\0');unsigned char tag[AES_BLOCK_SIZE];unsigned char iv[AES_BLOCK_SIZE];RAND_bytes(iv, sizeof(iv));std::copy(iv, iv + 16, output.begin() + 16);int actual_size = 0, final_size = 0;EVP_CIPHER_CTX* e_ctx = EVP_CIPHER_CTX_new();//EVP_CIPHER_CTX_ctrl(e_ctx, EVP_CTRL_GCM_SET_IVLEN, 16, NULL);EVP_EncryptInit(e_ctx, EVP_aes_128_gcm(), (const unsigned char*)key.c_str(), iv);EVP_EncryptUpdate(e_ctx, &output[32], &actual_size, (const unsigned char*)plaintext.data(), plaintext.length());EVP_EncryptFinal(e_ctx, &output[32 + actual_size], &final_size);EVP_CIPHER_CTX_ctrl(e_ctx, EVP_CTRL_GCM_GET_TAG, 16, tag);std::copy(tag, tag + 16, output.begin());std::copy(iv, iv + 16, output.begin() + 16);output.resize(32 + actual_size + final_size);EVP_CIPHER_CTX_free(e_ctx);return output;
}std::string aes_128_gcm_decrypt(std::vector<unsigned char> ciphertext, std::string key)
{aes_init();unsigned char tag[AES_BLOCK_SIZE];unsigned char iv[AES_BLOCK_SIZE];std::copy(ciphertext.begin(), ciphertext.begin() + 16, tag);std::copy(ciphertext.begin() + 16, ciphertext.begin() + 32, iv);std::vector<unsigned char> plaintext; plaintext.resize(ciphertext.size(), '\0');int actual_size = 0, final_size = 0;EVP_CIPHER_CTX *d_ctx = EVP_CIPHER_CTX_new();EVP_DecryptInit(d_ctx, EVP_aes_128_gcm(), (const unsigned char*)key.c_str(), iv);EVP_DecryptUpdate(d_ctx, &plaintext[0], &actual_size, &ciphertext[32], ciphertext.size() - 32);EVP_CIPHER_CTX_ctrl(d_ctx, EVP_CTRL_GCM_SET_TAG, 16, tag);EVP_DecryptFinal(d_ctx, &plaintext[actual_size], &final_size);EVP_CIPHER_CTX_free(d_ctx);plaintext.resize(actual_size + final_size, '\0');return string(plaintext.begin(), plaintext.end());
}int main(int argc, char **argv)
{aes_init();//create a sample keyunsigned char key_bytes[16];RAND_bytes(key_bytes, sizeof(key_bytes));string key = string((char *)key_bytes, sizeof(key_bytes));//text to encryptstring plaintext = "elephants in space";cout << plaintext << endl;//encryptvector<unsigned char> ciphertext = aes_128_gcm_encrypt(plaintext, key);//outputstatic const char *chars = "0123456789ABCDEF";for (int i = 0; i < ciphertext.size(); i++){cout << chars[ciphertext[i] / 16];cout << chars[ciphertext[i] % 16];}cout << endl;//decryptstring out = aes_128_gcm_decrypt(ciphertext, key);cout << out << endl;system("pause");
}

第二个代码：

//http://www.zedwood.com/article/cpp-openssl-aes-gcm-code-sample//http://wiki.openssl.org/index.php/EVP_Authenticated_Encryption_and_Decryption//g++ main.cpp -lcrypto#include <openssl/aes.h>
#include <openssl/evp.h>
#include <openssl/rand.h>
#include <string>
#include <sstream>
#include <vector>
#include <iostream>#include <chrono>using std::string;
using std::vector;
using std::cout;
using std::endl;
using namespace std;
using namespace chrono;EVP_CIPHER_CTX * e_ctx = nullptr;
EVP_CIPHER_CTX *d_ctx = nullptr;void aes_init()
{static int init = 0;if (init == 0){e_ctx = EVP_CIPHER_CTX_new();d_ctx = EVP_CIPHER_CTX_new();//initialize openssl ciphersOpenSSL_add_all_ciphers();//initialize random number generator (for IVs)int rv = RAND_load_file("/dev/urandom", 32);init++;}}//需要在函数外面使用free()释放参数out的内容
void aes_128_gcm_encrypt0(const char* plaintext, size_t plaintext_len,const char * key,unsigned char ** out, size_t & out_len) {size_t output_length = AES_BLOCK_SIZE + AES_BLOCK_SIZE + plaintext_len;unsigned char * output = (unsigned char*)malloc(output_length);RAND_bytes(output+16, 16);int actual_size = 0, final_size = 0;EVP_EncryptInit(e_ctx, EVP_aes_128_gcm(), (const unsigned char*)key, output + 16);EVP_EncryptUpdate(e_ctx, &output[32], &actual_size, (const unsigned char*)plaintext, plaintext_len);EVP_EncryptFinal(e_ctx, &output[32 + actual_size], &final_size);EVP_CIPHER_CTX_ctrl(e_ctx, EVP_CTRL_GCM_GET_TAG, 16, output);*out = output;out_len = output_length;
}std::vector<unsigned char> aes_128_gcm_encrypt(std::string plaintext, std::string key){size_t enc_length = plaintext.length() * 3;std::vector<unsigned char> output;output.resize(enc_length, '\0');unsigned char tag[AES_BLOCK_SIZE];unsigned char iv[AES_BLOCK_SIZE];RAND_bytes(iv, sizeof(iv));std::copy(iv, iv + 16, output.begin() + 16);int actual_size = 0, final_size = 0;EVP_CIPHER_CTX* e_ctx = EVP_CIPHER_CTX_new();//EVP_CIPHER_CTX_ctrl(e_ctx, EVP_CTRL_GCM_SET_IVLEN, 16, NULL);EVP_EncryptInit(e_ctx, EVP_aes_128_gcm(), (const unsigned char*)key.c_str(), iv);EVP_EncryptUpdate(e_ctx, &output[32], &actual_size, (const unsigned char*)plaintext.data(), plaintext.length());EVP_EncryptFinal(e_ctx, &output[32 + actual_size], &final_size);EVP_CIPHER_CTX_ctrl(e_ctx, EVP_CTRL_GCM_GET_TAG, 16, tag);std::copy(tag, tag + 16, output.begin());std::copy(iv, iv + 16, output.begin() + 16);output.resize(32 + actual_size + final_size);EVP_CIPHER_CTX_free(e_ctx);return output;
}//需要在函数外面使用free()释放参数out的内容
void aes_128_gcm_decrypt0(const char* ciphertext, size_t ciphertext_len,const char * key,unsigned char ** out, size_t & out_len) {unsigned char *plaintext = (unsigned char*)malloc(ciphertext_len - 32);int actual_size = 0, final_size = 0;EVP_DecryptInit(d_ctx, EVP_aes_128_gcm(), (const unsigned char*)key, (unsigned char*)ciphertext+16);EVP_DecryptUpdate(d_ctx, plaintext, &actual_size, (const unsigned char*)&ciphertext[32], ciphertext_len - 32);EVP_CIPHER_CTX_ctrl(d_ctx, EVP_CTRL_GCM_SET_TAG, 16, (char*)ciphertext);EVP_DecryptFinal(d_ctx, &plaintext[actual_size], &final_size);*out = plaintext;out_len = ciphertext_len - 32;
}std::string aes_128_gcm_decrypt(std::vector<unsigned char> ciphertext, std::string key)
{unsigned char tag[AES_BLOCK_SIZE];unsigned char iv[AES_BLOCK_SIZE];std::copy(ciphertext.begin(), ciphertext.begin() + 16, tag);std::copy(ciphertext.begin() + 16, ciphertext.begin() + 32, iv);std::vector<unsigned char> plaintext; plaintext.resize(ciphertext.size(), '\0');int actual_size = 0, final_size = 0;EVP_CIPHER_CTX *d_ctx = EVP_CIPHER_CTX_new();EVP_DecryptInit(d_ctx, EVP_aes_128_gcm(), (const unsigned char*)key.c_str(), iv);EVP_DecryptUpdate(d_ctx, &plaintext[0], &actual_size, &ciphertext[32], ciphertext.size() - 32);EVP_CIPHER_CTX_ctrl(d_ctx, EVP_CTRL_GCM_SET_TAG, 16, tag);EVP_DecryptFinal(d_ctx, &plaintext[actual_size], &final_size);EVP_CIPHER_CTX_free(d_ctx);plaintext.resize(actual_size + final_size, '\0');return string(plaintext.begin(), plaintext.end());
}void test() {aes_init();//create a sample keyunsigned char key_bytes[16];RAND_bytes(key_bytes, sizeof(key_bytes));string key = string((char *)key_bytes, sizeof(key_bytes));//text to encryptstring plaintext = "elephants in space dsfsdfgdgdliangyihuaifgf";cout << plaintext << endl;//encrypt//vector<unsigned char> ciphertext = aes_128_gcm_encrypt(plaintext, key);unsigned char * enc_msg = nullptr;size_t enc_msg_len = -1;aes_128_gcm_encrypt0(plaintext.c_str(), plaintext.length(), key.c_str(), &enc_msg, enc_msg_len);vector<unsigned char> ciphertext;ciphertext.resize(enc_msg_len, '\0');std::copy(enc_msg, enc_msg + enc_msg_len, ciphertext.begin());//outputstatic const char *chars = "0123456789ABCDEF";for (int i = 0; i < ciphertext.size(); i++){cout << chars[ciphertext[i] / 16];cout << chars[ciphertext[i] % 16];}cout << endl;//decrypt//string out = aes_128_gcm_decrypt(ciphertext, key);//cout << out << endl;unsigned char * dec_msg = nullptr;size_t len_dec_msg = -1;aes_128_gcm_decrypt0((char*)enc_msg, enc_msg_len, key.c_str(), &dec_msg, len_dec_msg);vector<unsigned char> ciphertext_final;ciphertext_final.resize(len_dec_msg, '\0');std::copy(dec_msg, dec_msg + len_dec_msg, ciphertext_final.begin());for (int i = 0; i < len_dec_msg; i++) {cout << dec_msg[i];}cout << endl;free(enc_msg);free(dec_msg);
}void performanceTest() {aes_init();//create a sample keyunsigned char key_bytes[16];RAND_bytes(key_bytes, sizeof(key_bytes));string key = string((char *)key_bytes, sizeof(key_bytes));//text to encryptstring plaintext = "elephants in space dsfsdfgdgdliangyihuaifgf";cout << plaintext << endl;const int round = 10000;auto begin = std::chrono::high_resolution_clock::now();for (int i = 0; i < round; i++) {//encryptunsigned char * enc_msg = nullptr;size_t enc_msg_len = -1;aes_128_gcm_encrypt0(plaintext.c_str(), plaintext.length(), key.c_str(), &enc_msg, enc_msg_len);/*vector<unsigned char> ciphertext;ciphertext.resize(enc_msg_len, '\0');std::copy(enc_msg, enc_msg + enc_msg_len, ciphertext.begin());*///output/*static const char *chars = "0123456789ABCDEF";for (int i = 0; i < ciphertext.size(); i++){cout << chars[ciphertext[i] / 16];cout << chars[ciphertext[i] % 16];}cout << endl;*///decryptunsigned char * dec_msg = nullptr;size_t len_dec_msg = -1;aes_128_gcm_decrypt0((char*)enc_msg, enc_msg_len, key.c_str(), &dec_msg, len_dec_msg);/*vector<unsigned char> ciphertext_final;ciphertext_final.resize(len_dec_msg, '\0');std::copy(dec_msg, dec_msg + len_dec_msg, ciphertext_final.begin());for (int i = 0; i < len_dec_msg; i++) {cout << dec_msg[i];}cout << endl;*/free(enc_msg);free(dec_msg);}auto end = std::chrono::high_resolution_clock::now();double elapsedTime = ((duration<double, std::milli>)(end - begin)).count();cout << "\ntotal elapsed time: " << elapsedTime << ", ave = " << (elapsedTime / round) << endl;}int main(int argc, char **argv)
{test();performanceTest();EVP_CIPHER_CTX_free(e_ctx);EVP_CIPHER_CTX_free(d_ctx);system("pause");
}

http://www.zedwood.com/article/cpp-openssl-aes-gcm-code-sample

http://wiki.openssl.org/index.php/EVP_Authenticated_Encryption_and_Decryption

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