Crypto 库是C/C++的加密算法库，这个加密库很流行，基本上涵盖了市面上的各类加密解密算法，以下代码是我在学习是总结的，放到这里用于后期需要时能够快速解决问题。
项目地址：https://www.cryptopp.com/
Sha256加密算法
Sha系列加密算法包括很多，基本上有以下几种格式的加密方式，位数越大加密强度越大，此算法属于单向加密算法与MD5类似但安全性高于MD5。
- SHA-1：生成摘要的性能比MD5略低
- SHA-256：可以生成长度256bit的信息摘要
- SHA-224：可以生成长度224bit的信息摘要
- SHA-384：可以生成长度384bit的信息摘要
- SHA-512：可以生成长度512bit的信息摘要
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#include <iostream>#include <Windows.h>#include <string>#include <sha.h>#include <md5.h>#include <crc.h>#include <files.h>#include <hex.h>#pragma comment(lib, "cryptlib.lib")using namespace std;using namespace CryptoPP;// 计算文件的 SHA256 值string CalSHA256_ByFile(char *pszFileName){ string value; SHA256 sha256; FileSource(pszFileName, true, new HashFilter(sha256, new HexEncoder(new StringSink(value)))); return value;}// 计算数据的 SHA256 值string CalSHA256_ByMem(PBYTE pData, DWORD dwDataSize){ string value; SHA256 sha256; StringSource(pData, dwDataSize, true, new HashFilter(sha256, new HexEncoder(new StringSink(value)))); return value;}int main(int argc, char * argv[]){ string src = "hello lyshark"; string dst; // 单独计算MD5值的使用 MD5 md5; StringSource(src, true, new HashFilter(md5, new HexEncoder(new StringSink(dst)))); cout << "计算字符串MD5: " << dst << endl; // 单独计算CRC32值 CRC32 crc32; StringSource(src, true, new HashFilter(crc32, new HexEncoder(new StringSink(dst)))); cout << "计算字符串CRC32: " << dst << endl; // 计算一个数组 BYTE pArrayData[] = { 10, 20, 30, 40, 50 }; DWORD dwArraySize = sizeof(pArrayData); dst.clear(); StringSource(pArrayData, dwArraySize, true, new HashFilter(md5, new HexEncoder(new StringSink(dst)))); cout << "计算数组的MD5: " << dst << endl; // 直接对文件计算Sha256散列值 string sha = CalSHA256_ByFile("c://BuidIAT.exe"); cout << "文件散列值: " << sha << endl; // 读入文件到内存后计算 HANDLE hFile = CreateFile(L"c://BuidIAT.exe", GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_ARCHIVE, NULL); DWORD dwFileSize = GetFileSize(hFile, NULL); BYTE *pData = new BYTE[dwFileSize]; ReadFile(hFile, pData, dwFileSize, NULL, NULL); string sha2 = CalSHA256_ByMem(pData, dwFileSize); cout << "内存中文件散列值: " << sha2.c_str() << endl; system("pause"); return 0;} |
AES 加密与解密
AES是对称加密，AES可使用16，24或32字节密钥（分别对应128，192和256位）。 Crypto++ 库缺省的密钥长度是16字节，也就是 AES:: DEFAULT_KEYLENGTH。
对于 ECB 和 CBC 模式，处理的数据必须是块大小的倍数。或者，你可以用 StreamTransformationFilter 围绕这个模式对象，并把它作为一个过滤器对象。StreamTransformationFilter 能够缓存数据到块中并根据需要填充。
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#include<cryptlib.h>#include<osrng.h>#include<iostream>#include<files.h>#include<aes.h>#include<modes.h>#include<hex.h>#pragma comment(lib, "cryptlib.lib")using namespace std;using namespace CryptoPP;int main(int argc, char * argv[]){ cout << "Key 长度: " << AES::DEFAULT_KEYLENGTH << endl; cout << "最小长度: " << AES::MIN_KEYLENGTH << endl; cout << "最大长度: " << AES::MAX_KEYLENGTH << endl; cout << "Block Size: " << AES::BLOCKSIZE << endl; AutoSeededRandomPool rand; // 产生一个随机数的密钥 SecByteBlock Key(0x00, AES::DEFAULT_KEYLENGTH); rand.GenerateBlock(Key, Key.size()); // 产生一个随机的初始向量 SecByteBlock ival(AES::BLOCKSIZE); rand.GenerateBlock(ival, ival.size()); byte plainText[] = "hello lyshark"; size_t Textlen = std::strlen((char*)plainText) + 1; cout << "待加密字符串长度: " << Textlen << endl; // 加密字符串 CFB_Mode<AES>::Encryption cfbEncryption(Key, Key.size(), ival); cfbEncryption.ProcessData(plainText, plainText, Textlen); cout << "显示加密后的十六进制数: "; StringSource strSource1(plainText, Textlen, true, new HexEncoder(new FileSink(cout))); // 解密字符串 并将数据输出到Cout流上 CFB_Mode<AES>::Decryption cfbDecryption(Key, Key.size(), ival); cfbDecryption.ProcessData(plainText, plainText, Textlen); cout << endl << "显示解密后的十六进制数: "; StringSource strSource2(plainText, Textlen, true, new HexEncoder(new FileSink(cout))); cout << endl; system("pause"); return 0;} |
以下代码使用CBC模式加密与解密指定字符串。如果需要针对字符串进行加解密则需要使用以下代码实现.
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#include<cryptlib.h>#include<osrng.h>#include<iostream>#include<files.h>#include<aes.h>#include<modes.h>#include<hex.h>#pragma comment(lib, "cryptlib.lib")using namespace std;using namespace CryptoPP;int main(int argc, char * argv[]){ // 开辟空间并将空间赋予初始值0 byte key[CryptoPP::AES::DEFAULT_KEYLENGTH], iv[CryptoPP::AES::BLOCKSIZE]; memset(key, 0x00, CryptoPP::AES::DEFAULT_KEYLENGTH); memset(iv, 0x00, CryptoPP::AES::BLOCKSIZE); // 指定需要加密的字符串与 std::string plaintext = "hello lyshark this is palintext"; std::string ciphertext; std::string decryptedtext; // 输出加密前字符串长度 std::cout << "加密前字符串长度: " << plaintext.size() << " bytes" << std::endl; std::cout << plaintext; std::cout << std::endl << std::endl; // 创建并开始加密字符串 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()); stfEncryptor.MessageEnd(); // 输出密文长度 std::cout << "加密密文长度: " << ciphertext.size() << " bytes" << std::endl; for (int i = 0; i < ciphertext.size(); i++) { std::cout << "0x" << std::hex << (0xFF & static_cast<byte>(ciphertext[i])) << " "; } std::cout << std::endl << std::endl; // 解密被加密的字符串 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(); // 输出解密后的字符串长度 std::cout << "解密后的字符串: " << std::endl; std::cout << decryptedtext; std::cout << std::endl << std::endl; system("pause"); return 0;} |
下面的示例使用CFB模式实现快速对字符串进行加解密,该模式的数据的长度并不需要是AES的块大小的倍数.
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#include<cryptlib.h>#include<osrng.h>#include<iostream>#include<files.h>#include<aes.h>#include<modes.h>#include<hex.h>#pragma comment(lib, "cryptlib.lib")using namespace std;using namespace CryptoPP;int main(int argc, char * argv[]){ AutoSeededRandomPool rand; // 生成随机Key SecByteBlock key(0x00, AES::DEFAULT_KEYLENGTH); rand.GenerateBlock(key, key.size()); // 生成随机IV值 byte iv[AES::BLOCKSIZE]; rand.GenerateBlock(iv, AES::BLOCKSIZE); // 需要加密的字符串 char plainText[] = "hello lyshark"; int messageLen = (int)strlen(plainText) + 1; // 执行快速加密 CFB_Mode<AES>::Encryption cfbEncryption(key, key.size(), iv); cfbEncryption.ProcessData((byte*)plainText, (byte*)plainText, messageLen); cout << "加密后的数据: " << plainText << endl; // 执行快速解密 CFB_Mode<AES>::Decryption cfbDecryption(key, key.size(), iv); cfbDecryption.ProcessData((byte*)plainText, (byte*)plainText, messageLen); cout << "解密后的数据: " << plainText << endl; system("pause"); return 0;} |
AES2 加密:
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#include<cryptlib.h>#include<iostream>#include <Windows.h>#pragma comment(lib, "cryptlib.lib")using namespace std;using namespace CryptoPP;// AES加密BOOL AesEncrypt(BYTE *pPassword, DWORD dwPasswordLength, BYTE *pData, DWORD &dwDataLength, DWORD dwBufferLength){ BOOL bRet = TRUE; HCRYPTPROV hCryptProv = NULL; HCRYPTHASH hCryptHash = NULL; HCRYPTKEY hCryptKey = NULL; do { // 获取CSP句柄 bRet = CryptAcquireContext(&hCryptProv, NULL, NULL, PROV_RSA_AES, CRYPT_VERIFYCONTEXT); if (FALSE == bRet) break; // 创建HASH对象 bRet = CryptCreateHash(hCryptProv, CALG_MD5, NULL, 0, &hCryptHash); if (FALSE == bRet) break; // 对密钥进行HASH计算 bRet = CryptHashData(hCryptHash, pPassword, dwPasswordLength, 0); if (FALSE == bRet) break; // 使用HASH来生成密钥 bRet = CryptDeriveKey(hCryptProv, CALG_AES_128, hCryptHash, CRYPT_EXPORTABLE, &hCryptKey); if (FALSE == bRet) break; // 加密数据 bRet = CryptEncrypt(hCryptKey, NULL, TRUE, 0, pData, &dwDataLength, dwBufferLength); if (FALSE == bRet) break; } while (FALSE); // 关闭释放 if (hCryptKey) CryptDestroyKey(hCryptKey); if (hCryptHash) CryptDestroyHash(hCryptHash); if (hCryptProv) CryptReleaseContext(hCryptProv, 0); return bRet;}// AES解密BOOL AesDecrypt(BYTE *pPassword, DWORD dwPasswordLength, BYTE *pData, DWORD &dwDataLength, DWORD dwBufferLength){ BOOL bRet = TRUE; HCRYPTPROV hCryptProv = NULL; HCRYPTHASH hCryptHash = NULL; HCRYPTKEY hCryptKey = NULL; do { // 获取CSP句柄 bRet = ::CryptAcquireContext(&hCryptProv, NULL, NULL, PROV_RSA_AES, CRYPT_VERIFYCONTEXT); if (FALSE == bRet) break; // 创建HASH对象 bRet = CryptCreateHash(hCryptProv, CALG_MD5, NULL, 0, &hCryptHash); if (FALSE == bRet) break; // 对密钥进行HASH计算 bRet = CryptHashData(hCryptHash, pPassword, dwPasswordLength, 0); if (FALSE == bRet) break; // 使用HASH来生成密钥 bRet = CryptDeriveKey(hCryptProv, CALG_AES_128, hCryptHash, CRYPT_EXPORTABLE, &hCryptKey); if (FALSE == bRet) break; // 解密数据 bRet = CryptDecrypt(hCryptKey, NULL, TRUE, 0, pData, &dwDataLength); if (FALSE == bRet) break; } while (FALSE); // 关闭释放 if (hCryptKey) CryptDestroyKey(hCryptKey); if (hCryptHash) CryptDestroyHash(hCryptHash); if (hCryptProv) CryptReleaseContext(hCryptProv, 0); return bRet;}int main(int argc, char * argv[]){ BYTE pData[MAX_PATH] = { 0 }; DWORD dwDataLength = 0, dwBufferLength = MAX_PATH; lstrcpy((char *)pData, "hello lyshark"); dwDataLength = 1 + lstrlen((char *)pData); // 原始十六进制数据 printf("AES 原始数据 [%d]: ", dwDataLength); for (int i = 0; i < dwDataLength; i++) { printf("%02x ", pData[i]); } printf("\n\n"); // AES 加密 AesEncrypt((BYTE *)"AAAVCDERFGTYHUJI", 16, pData, dwDataLength, dwBufferLength); printf("AES 加密后 [%d]: ", dwDataLength); for (int i = 0; i < dwDataLength; i++) { printf("%02x ", pData[i]); } printf("\n\n"); // AES 解密 AesDecrypt((BYTE *)"AAAVCDERFGTYHUJI", 16, pData, dwDataLength, dwBufferLength); printf("AES 解密后 [%d]: ", dwDataLength); for (int i = 0; i < dwDataLength; i++) { printf("%02x ", pData[i]); } system("pause"); return 0;} |
Base64加解密:
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#include<cryptlib.h>#include<osrng.h>#include<iostream>#include <Windows.h>#include<files.h>#include<base64.h>#include<modes.h>#include<hex.h>#pragma comment(lib, "cryptlib.lib")using namespace std;using namespace CryptoPP;void DisplayHex(BYTE *pData, DWORD dwSize){ for (int i = 0; i < dwSize; i++) { if ((0 != i) && (0 == i % 16)) printf("\n"); else if ((0 != i) && (0 == i % 8)) printf(" "); printf("%02X ", pData[i]); } printf("\n");}int main(int argc, char * argv[]){ unsigned char plainText[] = "hello lyshark"; // 对字符串编码 string encoded; Base64Encoder encoder; encoder.Put(plainText, sizeof(plainText)); encoder.MessageEnd(); word64 size = encoder.MaxRetrievable(); if (size) { encoded.resize(size); encoder.Get((byte *)&encoded[0], encoded.size()); } cout << "编码后的数据: " << encoded << endl; // 对字符串解码 string decoded; Base64Decoder decoder; decoder.Put((byte *)encoded.data(), encoded.size()); decoder.MessageEnd(); size = decoder.MaxRetrievable(); if (size && size <= SIZE_MAX) { decoded.resize(size); decoder.Get((byte *)&decoded[0], decoded.size()); } cout << "对字符串解码: " << decoded; // 输出解码字符串的十六进制格式 char szOriginalData[] = "hello lyshark"; cout << "字符串十六进制格式: "; DisplayHex((BYTE *)szOriginalData, (1 + lstrlen(szOriginalData))); system("pause"); return 0;} |
Hash加密算法
使用hash算法计算特定文件的Hash值.
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#include<cryptlib.h>#include<iostream>#include <Windows.h>#pragma comment(lib, "cryptlib.lib")using namespace std;using namespace CryptoPP;BOOL GetFileData(char *pszFilePath, BYTE **ppFileData, DWORD *pdwFileDataLength){ BOOL bRet = TRUE; BYTE *pFileData = NULL; DWORD dwFileDataLength = 0; HANDLE hFile = NULL; DWORD dwTemp = 0; do { hFile = CreateFile(pszFilePath, GENERIC_READ | GENERIC_WRITE,FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING,FILE_ATTRIBUTE_ARCHIVE, NULL); if (INVALID_HANDLE_VALUE == hFile) { bRet = FALSE; break; } dwFileDataLength = ::GetFileSize(hFile, NULL); pFileData = new BYTE[dwFileDataLength]; if (NULL == pFileData) { bRet = FALSE; break; } RtlZeroMemory(pFileData, dwFileDataLength); ReadFile(hFile, pFileData, dwFileDataLength, &dwTemp, NULL); // 返回 *ppFileData = pFileData; *pdwFileDataLength = dwFileDataLength; } while (FALSE); if (hFile) CloseHandle(hFile); return bRet;}BOOL CalculateHash(BYTE *pData, DWORD dwDataLength, ALG_ID algHashType, BYTE **ppHashData, DWORD *pdwHashDataLength){ HCRYPTPROV hCryptProv = NULL; HCRYPTHASH hCryptHash = NULL; BYTE *pHashData = NULL; DWORD dwHashDataLength = 0; DWORD dwTemp = 0; BOOL bRet = FALSE; do { // 获得指定CSP的密钥容器的句柄 bRet = CryptAcquireContext(&hCryptProv, NULL, NULL, PROV_RSA_AES, CRYPT_VERIFYCONTEXT); if (FALSE == bRet) break; // 创建一个HASH对象, 指定HASH算法 bRet = CryptCreateHash(hCryptProv, algHashType, NULL, NULL, &hCryptHash); if (FALSE == bRet) break; // 计算HASH数据 bRet = ::CryptHashData(hCryptHash, pData, dwDataLength, 0); if (FALSE == bRet) break; // 获取HASH结果的大小 dwTemp = sizeof(dwHashDataLength); bRet = ::CryptGetHashParam(hCryptHash, HP_HASHSIZE, (BYTE *)(&dwHashDataLength), &dwTemp, 0); if (FALSE == bRet) break; // 申请内存 pHashData = new BYTE[dwHashDataLength]; if (NULL == pHashData) { bRet = FALSE; break; } RtlZeroMemory(pHashData, dwHashDataLength); // 获取HASH结果数据 bRet = CryptGetHashParam(hCryptHash, HP_HASHVAL, pHashData, &dwHashDataLength, 0); if (FALSE == bRet) break; // 返回数据 *ppHashData = pHashData; *pdwHashDataLength = dwHashDataLength; } while (FALSE); // 释放关闭 if (FALSE == bRet) { if (pHashData) { delete[]pHashData; pHashData = NULL; } } if (hCryptHash) CryptDestroyHash(hCryptHash); if (hCryptProv) CryptReleaseContext(hCryptProv, 0); return bRet;}int main(int argc, char * argv[]){ BYTE *pData = NULL; DWORD dwDataLength = 0; BYTE *pHashData = NULL; DWORD dwHashDataLength = 0; // 获取文件流数据 GetFileData("c://BuidIAT.exe", &pData, &dwDataLength); // 计算 MD5 CalculateHash(pData, dwDataLength, CALG_MD5, &pHashData, &dwHashDataLength); printf("MD5 Hash -> "); for (int i = 0; i < dwHashDataLength; i++) printf("%x", pHashData[i]); printf("\n\n", dwHashDataLength); if (pHashData) { delete[]pHashData; pHashData = NULL; } // 计算 SHA1 CalculateHash(pData, dwDataLength, CALG_SHA1, &pHashData, &dwHashDataLength); printf("SHA1 -> "); for (int i = 0; i < dwHashDataLength; i++) printf("%x", pHashData[i]); printf("\n\n", dwHashDataLength); if (pHashData) { delete[]pHashData; pHashData = NULL; } // 计算 SHA256 CalculateHash(pData, dwDataLength, CALG_SHA_256, &pHashData, &dwHashDataLength); printf("SHA256 -> "); for (int i = 0; i < dwHashDataLength; i++) printf("%x", pHashData[i]); printf("\n\n", dwHashDataLength); if (pHashData) { delete[]pHashData; pHashData = NULL; } system("pause"); return 0;} |
RSA加密算法
RSA算法包括公钥与私钥两部,加密时会先使用RSA生成公钥与私钥,然后在进行加密.
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#include<iostream>#include <Windows.h>using namespace std;// 生成公钥和私钥BOOL GenerateKey(BYTE **ppPublicKey, DWORD *pdwPublicKeyLength, BYTE **ppPrivateKey, DWORD *pdwPrivateKeyLength){ BOOL bRet = TRUE; HCRYPTPROV hCryptProv = NULL; HCRYPTKEY hCryptKey = NULL; BYTE *pPublicKey = NULL; DWORD dwPublicKeyLength = 0; BYTE *pPrivateKey = NULL; DWORD dwPrivateKeyLength = 0; do { // 获取CSP句柄 bRet = CryptAcquireContext(&hCryptProv, NULL, NULL, PROV_RSA_FULL, 0); if (FALSE == bRet) break; // 生成公私密钥对 bRet = CryptGenKey(hCryptProv, AT_KEYEXCHANGE, CRYPT_EXPORTABLE, &hCryptKey); if (FALSE == bRet) break; // 获取公钥密钥的长度和内容 bRet = CryptExportKey(hCryptKey, NULL, PUBLICKEYBLOB, 0, NULL, &dwPublicKeyLength); if (FALSE == bRet) break; pPublicKey = new BYTE[dwPublicKeyLength]; RtlZeroMemory(pPublicKey, dwPublicKeyLength); bRet = CryptExportKey(hCryptKey, NULL, PUBLICKEYBLOB, 0, pPublicKey, &dwPublicKeyLength); if (FALSE == bRet) break; // 获取私钥密钥的长度和内容 bRet = CryptExportKey(hCryptKey, NULL, PRIVATEKEYBLOB, 0, NULL, &dwPrivateKeyLength); if (FALSE == bRet) break; pPrivateKey = new BYTE[dwPrivateKeyLength]; RtlZeroMemory(pPrivateKey, dwPrivateKeyLength); bRet = CryptExportKey(hCryptKey, NULL, PRIVATEKEYBLOB, 0, pPrivateKey, &dwPrivateKeyLength); if (FALSE == bRet) break; // 返回数据 *ppPublicKey = pPublicKey; *pdwPublicKeyLength = dwPublicKeyLength; *ppPrivateKey = pPrivateKey; *pdwPrivateKeyLength = dwPrivateKeyLength; } while (FALSE); // 释放关闭 if (hCryptKey) CryptDestroyKey(hCryptKey); if (hCryptProv) CryptReleaseContext(hCryptProv, 0); return bRet;}// 公钥加密数据BOOL RsaEncrypt(BYTE *pPublicKey, DWORD dwPublicKeyLength, BYTE *pData, DWORD &dwDataLength, DWORD dwBufferLength){ BOOL bRet = TRUE; HCRYPTPROV hCryptProv = NULL; HCRYPTKEY hCryptKey = NULL; do { // 获取CSP句柄 bRet = CryptAcquireContext(&hCryptProv, NULL, NULL, PROV_RSA_FULL, 0); if (FALSE == bRet) break; // 导入公钥 bRet = CryptImportKey(hCryptProv, pPublicKey, dwPublicKeyLength, NULL, 0, &hCryptKey); if (FALSE == bRet) break; // 加密数据 bRet = CryptEncrypt(hCryptKey, NULL, TRUE, 0, pData, &dwDataLength, dwBufferLength); if (FALSE == bRet) break; } while (FALSE); // 释放并关闭 if (hCryptKey) CryptDestroyKey(hCryptKey); if (hCryptProv) CryptReleaseContext(hCryptProv, 0); return bRet;}// 私钥解密数据BOOL RsaDecrypt(BYTE *pPrivateKey, DWORD dwProvateKeyLength, BYTE *pData, DWORD &dwDataLength){ BOOL bRet = TRUE; HCRYPTPROV hCryptProv = NULL; HCRYPTKEY hCryptKey = NULL; do { // 获取CSP句柄 bRet = CryptAcquireContext(&hCryptProv, NULL, NULL, PROV_RSA_FULL, 0); if (FALSE == bRet) break; // 导入私钥 bRet = CryptImportKey(hCryptProv, pPrivateKey, dwProvateKeyLength, NULL, 0, &hCryptKey); if (FALSE == bRet) break; // 解密数据 bRet = CryptDecrypt(hCryptKey, NULL, TRUE, 0, pData, &dwDataLength); if (FALSE == bRet) break; } while (FALSE); // 释放并关闭 if (hCryptKey) CryptDestroyKey(hCryptKey); if (hCryptProv) CryptReleaseContext(hCryptProv, 0); return bRet;}int main(int argc, char * argv[]){ BYTE *pPublicKey = NULL; DWORD dwPublicKeyLength = 0; BYTE *pPrivateKey = NULL; DWORD dwPrivateKeyLength = 0; BYTE *pData = NULL; DWORD dwDataLength = 0; DWORD dwBufferLength = 4096; pData = new BYTE[dwBufferLength]; RtlZeroMemory(pData, dwBufferLength); lstrcpy((char *)pData, "hello lyshark"); dwDataLength = 1 + lstrlen((char *)pData); // 输出加密前原始数据 printf("加密前原始数据: "); for (int i = 0; i < dwDataLength; i++) printf("%x", pData[i]); printf("\n\n"); // 生成公钥和私钥 GenerateKey(&pPublicKey, &dwPublicKeyLength, &pPrivateKey, &dwPrivateKeyLength); printf("公钥: "); for (int i = 0; i < dwPublicKeyLength; i++) printf("%.2x", pPublicKey[i]); printf("\n\n"); printf("私钥: "); for (int i = 0; i < dwPrivateKeyLength; i++) printf("%.2x", pPrivateKey[i]); printf("\n\n"); // 使用公钥加密 RsaEncrypt(pPublicKey, dwPublicKeyLength, pData, dwDataLength, dwBufferLength); printf("公钥加密: "); for (int i = 0; i < dwDataLength; i++) printf("%x", pData[i]); printf("\n\n"); // 使用私钥解密 RsaDecrypt(pPrivateKey, dwPrivateKeyLength, pData, dwDataLength); printf("私钥解密: "); for (int i = 0; i < dwDataLength; i++) printf("%x", pData[i]); printf("\n\n"); delete[]pData; delete[]pPrivateKey; delete[]pPublicKey; system("pause"); return 0;} |
Crypt库实现RSA加密
RSA加密一般使用公钥加密私钥解密,先生成公钥与私钥,然后使用这两份密钥对字符串等数据进行操作.
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#include<cryptlib.h>#include<osrng.h>#include<iostream>#include<files.h>#include <Windows.h>#include <rsa.h>#include <hex.h>#include<modes.h>#pragma comment(lib, "cryptlib.lib")using namespace std;using namespace CryptoPP;// 定义全局随机数池RandomPool & GlobalRNG();RandomPool & GlobalRNG(){ static RandomPool randomPool; return randomPool;}// 生成RSA密钥对BOOL GenerateRSAKey(DWORD dwRSAKeyLength, char *pszPrivateKeyFileName, char *pszPublicKeyFileName, BYTE *pSeed, DWORD dwSeedLength){ RandomPool randPool; randPool.Put(pSeed, dwSeedLength); // 生成RSA私钥 RSAES_OAEP_SHA_Decryptor priv(randPool, dwRSAKeyLength); HexEncoder privFile(new FileSink(pszPrivateKeyFileName)); // 打开文件实行序列化操作 priv.DEREncode(privFile); privFile.MessageEnd(); // 生成RSA公钥 RSAES_OAEP_SHA_Encryptor pub(priv); HexEncoder pubFile(new FileSink(pszPublicKeyFileName)); // 打开文件实行序列化操作 pub.DEREncode(pubFile); // 写密码对象pub到文件对象pubFile里 pubFile.MessageEnd(); return TRUE;}/* 此处的加密算法是通过文件中的公钥与私钥进行加密的*/// RSA加密字符串string RSA_Encrypt_ByFile(char *pszOriginaString, char *pszPublicKeyFileName, BYTE *pSeed, DWORD dwSeedLength){ RandomPool randPool; randPool.Put(pSeed, dwSeedLength); FileSource pubFile(pszPublicKeyFileName, TRUE, new HexDecoder); RSAES_OAEP_SHA_Encryptor pub(pubFile); // 加密 string strEncryptString; StringSource(pszOriginaString, TRUE, new PK_EncryptorFilter(randPool, pub, new HexEncoder(new StringSink(strEncryptString)))); return strEncryptString;}// RSA解密字符串string RSA_Decrypt_ByFile(char *pszEncryptString, char *pszPrivateKeyFileName){ FileSource privFile(pszPrivateKeyFileName, TRUE, new HexDecoder); RSAES_OAEP_SHA_Decryptor priv(privFile); string strDecryptString; StringSource(pszEncryptString, TRUE, new HexDecoder(new PK_DecryptorFilter(GlobalRNG(), priv, new StringSink(strDecryptString)))); return strDecryptString;}/* 通过在内存中的密钥对进行加密与解密 */// RSA加密字符串string RSA_Encrypt_ByMem(char *pszOriginaString, char *pszMemPublicKey, BYTE *pSeed, DWORD dwSeedLength){ RandomPool randPool; randPool.Put(pSeed, dwSeedLength); StringSource pubStr(pszMemPublicKey, TRUE, new HexDecoder); RSAES_OAEP_SHA_Encryptor pub(pubStr); // 加密 string strEncryptString; StringSource(pszOriginaString, TRUE, new PK_EncryptorFilter(randPool, pub, new HexEncoder(new StringSink(strEncryptString)))); return strEncryptString;}// RSA解密字符串string RSA_Decrypt_ByMem(char *pszEncryptString, char *pszMemPrivateKey){ StringSource privStr(pszMemPrivateKey, TRUE, new HexDecoder); RSAES_OAEP_SHA_Decryptor priv(privStr); string strDecryptString; StringSource(pszEncryptString, TRUE, new HexDecoder(new PK_DecryptorFilter(GlobalRNG(), priv, new StringSink(strDecryptString)))); return strDecryptString;}int main(int argc, char * argv[]){ // 指定公钥与私钥所在文件目录 char szPrivateFile[] = "c://private.key"; char szPublicFile[] = "c://public.key"; // 指定一串随机数种子 char szSeed[] = "ABCDESGHETYSQDGH"; // 以下就是待加密的字符串 char szOriginalString[] = "hello lyshark"; /* 此处是从文件中读取出公钥与私钥对特定字符串进行加密与解密 */ // 生成RSA公私密钥对 GenerateRSAKey(1024, szPrivateFile, szPublicFile, (BYTE *)szSeed, lstrlen(szSeed)); // RSA公钥加密字符串 string strEncryptString = RSA_Encrypt_ByFile(szOriginalString, szPublicFile, (BYTE *)szSeed, lstrlen(szSeed)); // RSA私钥解密字符串 string strDecryptString = RSA_Decrypt_ByFile((char *)strEncryptString.c_str(), szPrivateFile); // 显示 printf("原文字符串:\t[%d]%s\n", lstrlen(szOriginalString), szOriginalString); printf("密文字符串:\t[%d]%s\n", strEncryptString.length(), strEncryptString.c_str()); printf("明文字符串:\t[%d]%s\n", strDecryptString.length(), strDecryptString.c_str()); printf("\n\n"); // -------------------------------------------------------------------------------------------------------------- /* 此处是在内存中对指定字符串进行解密*/ char g_szPubKey[] = "填充公钥"; char g_szPrivKey[] = "填充私钥"; // RSA公钥加密字符串 string strEncryptString_Mem = RSA_Encrypt_ByMem(szOriginalString, g_szPubKey, (BYTE *)szSeed, ::lstrlen(szSeed)); // RSA私钥解密字符串 string strDecryptString_Mem = RSA_Decrypt_ByMem((char *)strEncryptString_Mem.c_str(), g_szPrivKey); // 显示 printf("原文字符串:\n[%d]%s\n", ::lstrlen(szOriginalString), szOriginalString); printf("密文字符串:\n[%d]%s\n", strEncryptString_Mem.length(), strEncryptString_Mem.c_str()); printf("明文字符串:\n[%d]%s\n", strDecryptString_Mem.length(), strDecryptString_Mem.c_str()); system("pause"); return 0; |
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原文链接：https://blog.csdn.net/qq_29186859/article/details/118345549
