cryptopp 是 c++ 加解密库，包含了大部分主流的加解密实现功能。详细可以查看官方文档。本章主要是写 demo，测试 cryptopp 的使用。
1. 安装
1.1. 命令安装
- MacOS
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brew install cryptopp
- Linux
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yum install cryptopp
1.2. 源码安装
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wget https://codeload.github.com/weidai11/cryptopp/tar.gz/refs/tags/CRYPTOPP_8_5_0
tar zxf cryptopp-CRYPTOPP_8_5_0.tar.gz
cd cryptopp-CRYPTOPP_8_5_0
# 编译静态库
make
# 编译动态库
make libcryptopp.so
# 安装
sudo make install
2. 算法使用
2.1. gzip
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bool gzip(const std::string& src, std::string& dst) {
try {
CryptoPP::Gzip zip;
zip.Put((byte*)src.c_str(), src.size());
zip.MessageEnd();
CryptoPP::word64 avail = zip.MaxRetrievable();
if (avail) {
dst.resize(avail);
zip.Get((byte*)&dst[0], dst.size());
}
} catch (CryptoPP::InvalidDataFormat& e) {
std::cout << e.GetWhat() << std::endl;
return false;
}
return true;
}
bool ungzip(const std::string& src, std::string& dst) {
try {
CryptoPP::Gunzip zip;
zip.Put((byte*)src.c_str(), src.size());
zip.MessageEnd();
CryptoPP::word64 avail = zip.MaxRetrievable();
if (avail) {
dst.resize(avail);
zip.Get((byte*)&dst[0], dst.size());
}
} catch (CryptoPP::InvalidDataFormat& e) {
std::cout << e.GetWhat() << std::endl;
return false;
}
return (true);
}
void test_gzip() {
std::cout << "test gzip:" << std::endl;
// gzip
std::string src("hello world!"), dst;
if (gzip(src, dst)) {
std::cout << "gzip: " << dst << std::endl;
} else {
std::cout << "gzip failed!" << std::endl;
}
// ungizp
if (ungzip(dst, src)) {
std::cout << "ungzip: " << src << std::endl;
} else {
std::cout << "ungzip failed!" << std::endl;
}
}
2.2. aes crt
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std::string aes_crt_encrypt(const std::string& k1, const std::string& iv1, const std::string& message) {
using namespace CryptoPP;
std::string encrypted;
CryptoPP::SecByteBlock key(16), iv(16);
std::memcpy(key, k1.c_str(), k1.size());
std::memcpy(iv, iv1.c_str(), iv1.size());
std::cout << "k1: " << k1 << " len: " << iv1.length() << std::endl
<< "iv1: " << iv1 << " len: " << iv1.length() << std::endl;
AES::Encryption aesEncryption(key, key.size());
CTR_Mode_ExternalCipher::Encryption ctrEncryption(aesEncryption, iv);
StreamTransformationFilter stfEncryptor(
ctrEncryption, new StringSink(encrypted));
stfEncryptor.Put((const byte*)&message[0], message.size());
stfEncryptor.MessageEnd();
return encrypted;
}
std::string aes_crt_decrypt(const std::string& k1, const std::string& iv1, std::string encrypted) {
using namespace CryptoPP;
std::string decrypted;
CryptoPP::SecByteBlock key(16), iv(16);
std::memcpy(key, k1.c_str(), k1.size());
std::memcpy(iv, iv1.c_str(), iv1.size());
std::cout << "encrypted data cnt: " << encrypted.length() << std::endl
<< "-----" << std::endl;
AES::Encryption aesDecryption(key, key.size());
CTR_Mode_ExternalCipher::Decryption ctrDecryption(aesDecryption, iv);
StreamTransformationFilter stfDecryptor(
ctrDecryption, new StringSink(decrypted));
std::cout << "encrypted size: " << encrypted.size() << std::endl;
stfDecryptor.Put((const byte*)&encrypted[0], encrypted.size());
stfDecryptor.MessageEnd();
std::cout << "recovered data len: " << decrypted.length() << std::endl;
return decrypted;
}
void test_aes_crt() {
std::string encrypted, decrypted, message;
std::string key = "1234567890123456";
std::string iv = "1234567890123456";
message =
"Now is the time for all good men "
"to come to the aide of their country.";
encrypted = aes_crt_encrypt(key, iv, message);
decrypted = aes_crt_decrypt(key, iv, encrypted);
std::cout << "decrypt data: " << decrypted << std::endl;
}
2.3. md5
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std::string md5(const std::string& text) {
/* https://www.cryptopp.com/wiki/MD5 */
std::string digest;
CryptoPP::Weak1::MD5 md5;
CryptoPP::HashFilter hashfilter(md5);
hashfilter.Attach(new CryptoPP::HexEncoder(new CryptoPP::StringSink(digest), false));
hashfilter.Put(reinterpret_cast<const unsigned char*>(text.c_str()), text.length());
hashfilter.MessageEnd();
return digest;
}
void test_md5() {
std::cout << "test md5:" << std::endl;
std::cout << md5("hello world!").c_str() << std::endl;
}
