C++ useful encryption library: Crypto++

In many application scenarios, cryptographic algorithms need to be used to protect the security and integrity of data.

The Crypto++ library provides a convenient way to use these algorithms and is a widely used open source cryptography library.

Crypto++

Crypto++ is an open source encryption library for cryptographic operations such as encryption, decryption, hashing, signing, and verification.

Crypto++ is a C++ library that provides a wealth of cryptographic algorithms, such as public key encryption (RSA, DSA), symmetric encryption (AES, DES, RC6), hash functions (SHA-1, SHA-2), and message authentication codes. (HMAC), etc., supporting various application scenarios.

Crypto++ provides a rich set of cryptography algorithms, including many encryption algorithms and protocols commonly used in cryptography.

Basic features:

• Supports multiple encryption algorithms: Crypto++ supports multiple symmetric encryption algorithms (such as AES, DES, 3DES, etc.) and public key encryption algorithms (such as RSA, ECC, etc.).
• Easy to use: Crypto++ provides a simple API, making cryptographic operations easy to understand and implement.
• Platform independent: The Crypto++ library can run on various platforms, including Windows, Linux, macOS, etc.
• Safe and reliable: Crypto++ uses widely proven cryptographic algorithms and modes to ensure data security and integrity.

Crypto++ compilation

1 Overview

Crypto++ source code download address: https://github.com/weidai11/cryptopp

2. Open the Visual Studio project

Visual Studio opens the sln project file in the directory:

Select the cryptlib project and compile its static library:

Modify Windows SDK version:

Modify the runtime library to MD:

Compile the Debug version first:

Continue to compile the Release version:

The compilation results are in the current Output directory:

3. Organize library files

For ease of use, you can organize related files into a folder:

Among them, copy all header files in the source directory in include:

Crypto++ library usage

1.Project settings

(1) Header file reference

Add header file reference in project settings:

(2) Library file reference

Add library file search path in project settings:

Add the library files to be referenced:

2. Code examples

Here is a simple example of AES encryption and decryption using the Crypto++ library:

#include <iostream>
#include <string>
#include <aes.h>
#include <modes.h>
#include <filters.h>


int main()
{
 using namespace CryptoPP;

 // 明文和密钥
 std::string plainText = "Hello, Crypto++!";
 std::string keyStr = "0123456789abcdef"; // 设置密钥字符串

 byte key[AES::MAX_KEYLENGTH];
 memset(key, 0x00, AES::MAX_KEYLENGTH);
 size_t keyLen = keyStr.length() < AES::MAX_KEYLENGTH ? keyStr.length() : AES::MAX_KEYLENGTH;
 memcpy(key, keyStr.c_str(), keyLen);

 // 加密过程
 byte iv[AES::BLOCKSIZE];
 memset(iv, 0x00, AES::BLOCKSIZE);
 std::string cipherText;
 {
  CFB_Mode<AES>::Encryption encr;
  encr.SetKeyWithIV(key, AES::MAX_KEYLENGTH, iv);

  StringSource(plainText, true, new StreamTransformationFilter(encr, new StringSink(cipherText)));
 }

 // 打印密文
 std::cout << "密文: " << std::string(cipherText.begin(), cipherText.end()) << std::endl;

 // 解密过程
 std::string recoveredText;
 {
  CFB_Mode<AES>::Decryption decr;
  decr.SetKeyWithIV(key, AES::MAX_KEYLENGTH, iv);

  StringSource(cipherText, true, new StreamTransformationFilter(decr, new StringSink(recoveredText)));
 }

 // 打印解密后的明文
 std::cout << "明文: " << recoveredText << std::endl;

 return 0;
}
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The running results are as follows: