class="markdown_views prism-github-gist">        提供SDK给别人调用时候，有时候需要一个llicense.lic，一下是一个最简单的Demo，使用AES算法进行加密，在网上找了半天没有任何头绪，也不知道该怎么做。能够想到的就是这种比较low的方法了。

1依赖

一下AES算法是在crypto++库上实现的，首先安装crypto++。去官网下载相应的源码，低版本的好像对需要4.7一下版本GCC，我这里选择的是5.65。
安装： make make libcryptopp.so make install 安装很简单，完成之后默认头文件在/usr/local/include下，链接库在/usr/local/lib下。

2实现

我使用的是读取mac地址和系统时间，对齐加密后存入llicense.lic，使用时候解密后给别人使用就ok了。
这里读取系统时间以及mac地址见https://blog.csdn.net/ycdhqzhiai/article/details/80840392
源码如下： /* AES.h */ #include #include #include #include #include #include #include #include using namespace CryptoPP; using namespace std; class MyAES { public: byte * key; byte * iv; int key_length; MyAES(); MyAES(byte * key, byte *iv, int length); ~MyAES(); //use the key to encrypt the plainText and return the cipher string Encrypt(string plainText); //use the same key to decrypt the cipher and return the recover string Decrypt(string cipherTextHex); void GenerateKey(); void SetKey(byte * key, byte * iv, int length); }; /* Decrypt.cpp 解密 */ #include "AES.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include MyAES::MyAES() { } MyAES::MyAES(byte * key1, byte * iv1, int key_length1) { SetKey(key1, iv1, key_length1); } MyAES::~MyAES() { } void MyAES::GenerateKey() { AutoSeededRandomPool rnd; byte key1[AES::DEFAULT_KEYLENGTH]; rnd.GenerateBlock(key1, AES::DEFAULT_KEYLENGTH); // Generate a random IV byte iv1[AES::BLOCKSIZE]; rnd.GenerateBlock(iv1, AES::BLOCKSIZE); SetKey(key1, iv1, 16); } void MyAES::SetKey(byte * key1, byte * iv1, int length1) { this->key = key1; this->iv = iv1; this->key_length = length1; } string MyAES::Encrypt(string plainText) { string cipherText; // CryptoPP::AES::Encryption aesEncryption(key, CryptoPP::AES::DEFAULT_KEYLENGTH); CryptoPP::CBC_Mode_ExternalCipher::Encryption cbcEncryption( aesEncryption, iv ); CryptoPP::StreamTransformationFilter stfEncryptor(cbcEncryption, new CryptoPP::StringSink( cipherText )); stfEncryptor.Put( reinterpret_cast<const unsigned char*>( plainText.c_str() ), plainText.length() + 1 ); stfEncryptor.MessageEnd(); string cipherTextHex; for( int i = 0; i < cipherText.size(); i++ ) { char ch[3] = {0}; sprintf(ch, "%02x", static_cast(cipherText[i])); cipherTextHex += ch; } return cipherTextHex; } string MyAES::Decrypt(string cipherTextHex) { string cipherText; string decryptedText; int i = 0; while(true) { char c; int x; stringstream ss; ss<2).c_str(); ss>>x; c = (char)x; cipherText += c; if(i >= cipherTextHex.length() - 2)break; i += 2; } // CryptoPP::AES::Decryption aesDecryption(key, CryptoPP::AES::DEFAULT_KEYLENGTH); CryptoPP::CBC_Mode_ExternalCipher::Decryption cbcDecryption( aesDecryption, iv ); CryptoPP::StreamTransformationFilter stfDecryptor(cbcDecryption, new CryptoPP::StringSink( decryptedText )); stfDecryptor.Put( reinterpret_cast<const unsigned char*>( cipherText.c_str() ), cipherText.size()); stfDecryptor.MessageEnd(); return decryptedText; } string ltos(long l) { ostringstream os; os<string result; istringstream is(os.str()); is>>result; return result; } int main() { byte key[] = {0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x01, 0x01,0x02, 0x03,0x04,0x05,0x06,0x07,0x01}; byte iv[] = {0x01,0x02,0x03,0x03,0x03,0x03,0x03,0x03, 0x03,0x03, 0x01,0x02,0x03,0x03,0x03,0x03}; int keysize = 16; std::string month = "1"; MyAES aes(key, iv, keysize); cout << "AES parameters: " << endl; cout << "The algorithm name is : " << AES::StaticAlgorithmName() << endl; cout << "The iv is : " << aes.iv << endl; cout << "The key is : " << aes.key << endl; cout << "The key length is : " << aes.key_length << endl; string month_cipher = aes.Encrypt(month); ofstream out("license.lic", ios::app); out.write(month_cipher.c_str(), month_cipher.length()); out.close(); ifstream in("license.lic"); string line; string decryptedText; while(getline(in, line)) { if(line.length() > 1) { decryptedText = aes.Decrypt(line); } cout<<"readCipher finish "<< decryptedText <return 0; } /* Encrypt.cpp 加密 */ #include "AES.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include MyAES::MyAES() { } MyAES::MyAES(byte * key1, byte * iv1, int key_length1) { SetKey(key1, iv1, key_length1); } MyAES::~MyAES() { } void MyAES::GenerateKey() { AutoSeededRandomPool rnd; byte key1[AES::DEFAULT_KEYLENGTH]; rnd.GenerateBlock(key1, AES::DEFAULT_KEYLENGTH); // Generate a random IV byte iv1[AES::BLOCKSIZE]; rnd.GenerateBlock(iv1, AES::BLOCKSIZE); SetKey(key1, iv1, 16); } void MyAES::SetKey(byte * key1, byte * iv1, int length1) { this->key = key1; this->iv = iv1; this->key_length = length1; } string MyAES::Encrypt(string plainText) { string cipherText; CryptoPP::AES::Encryption aesEncryption(key, CryptoPP::AES::DEFAULT_KEYLENGTH); CryptoPP::CBC_Mode_ExternalCipher::Encryption cbcEncryption( aesEncryption, iv ); CryptoPP::StreamTransformationFilter stfEncryptor(cbcEncryption, new CryptoPP::StringSink( cipherText )); stfEncryptor.Put( reinterpret_cast<const unsigned char*>( plainText.c_str() ), plainText.length() + 1 ); stfEncryptor.MessageEnd(); string cipherTextHex; for( int i = 0; i < cipherText.size(); i++ ) { char ch[3] = {0}; sprintf(ch, "%02x", static_cast(cipherText[i])); cipherTextHex += ch; } return cipherTextHex; } string MyAES::Decrypt(string cipherTextHex) { string cipherText; string decryptedText; int i = 0; while(true) { char c; int x; stringstream ss; ss<2).c_str(); ss>>x; c = (char)x; cipherText += c; if(i >= cipherTextHex.length() - 2)break; i += 2; } // CryptoPP::AES::Decryption aesDecryption(key, CryptoPP::AES::DEFAULT_KEYLENGTH); CryptoPP::CBC_Mode_ExternalCipher::Decryption cbcDecryption( aesDecryption, iv ); CryptoPP::StreamTransformationFilter stfDecryptor(cbcDecryption, new CryptoPP::StringSink( decryptedText )); stfDecryptor.Put( reinterpret_cast<const unsigned char*>( cipherText.c_str() ), cipherText.size()); stfDecryptor.MessageEnd(); return decryptedText; } string ltos(long l) { ostringstream os; os<string result; istringstream is(os.str()); is>>result; return result; } int main() { byte key[] = {0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x01, 0x01,0x02, 0x03,0x04,0x05,0x06,0x07,0x01}; byte iv[] = {0x01,0x02,0x03,0x03,0x03,0x03,0x03,0x03, 0x03,0x03, 0x01,0x02,0x03,0x03,0x03,0x03}; int keysize = 16; char * this_mac = new char[6]; get_mac(this_mac); printf("this mac: %s ", this_mac); time_t tt = time(NULL); long cur_t = (long)tt; string begin = ltos(cur_t); char mac[64]; sprintf(mac,"%02x:%02x:%02x:%02x:%02x:%02x",this_mac[0]&0xff, this_mac[1]&0xff, this_mac[2]&0xff, this_mac[3]&0xff, this_mac[4]&0xff, this_mac[5]&0xff); printf("mac: %02x:%02x:%02x:%02x:%02x:%02x ", this_mac[0]&0xff, this_mac[1]&0xff, this_mac[2]&0xff, this_mac[3]&0xff, this_mac[4]&0xff, this_mac[5]&0xff); std::string mac_addre = mac; //std::string month = "1"; printf("mac: %s time: %s ", mac_addre.c_str(), begin.c_str()); MyAES aes(key, iv, keysize); cout << "AES parameters: " << endl; cout << "The algorithm name is : " << AES::StaticAlgorithmName() << endl; cout << "The iv is : " << aes.iv << endl; cout << "The key is : " << aes.key << endl; cout << "The key length is : " << aes.key_length << endl; string mac_cipher = aes.Encrypt(mac_addre); string time_cipher = aes.Encrypt(begin); //string month_cipher = aes.Encrypt(month); cout << "The mac_cipher is : " << mac_cipher << endl; cout << "The time_cipher is : " << time_cipher << endl; if (access("license.lic", 0) == -1) system("touch license.lic"); ofstream out("license.lic"); out.write(mac_cipher.c_str(), mac_cipher.length()); out << " "; //out.write(" "); out.write(time_cipher.c_str(), time_cipher.length()); out << " "; //out.write(month_cipher.c_str(), month_cipher.length()); out.close(); return 0; }

3编译

编译很简单，只需要链接上libcryptopp.so就行 g++ *.cpp -o * -lpthread -lcryptopp

PS::

如果想用在caffe项目中，切记将#include “AES.h”放在最上面