0 引言
为阅读本文，读者需要具备密码学最基本的知识，如：对称加密和非对称 加密、数字签名等。还好，准备这些知识，一个下午的时间就足够了。
许多朋友问我 如何使用CryptoPP（目前最新版本为5.4），我以前也没用过，但一直觉得是个好东西，属于 经典的C++库之一。因此，有必要把它作为我的软件基石之一。我以前是用Windows的Crypt API的，ATL有对应的封装类。但是，我遇到了一个问题之后，决定放弃Crypt API。原因是， 我使用Win2003加密的东西，在Win2000上解密失败。很火大。水平有限，时间有限，就不深 入寻找原因了。
改投开源的CryptoPP C++库门下，发现CryptoPP的用法诡异，到处是 陷阱一样的模板，对于我这个对密码学本身略知皮毛的人来说，无疑是雪上加霜。头一次使 用，以失败而铩羽。但是，CryptoPP在业界的好名声，使我不忍放弃，时隔半年之后，我终 于重读CryptoPP的例子，摸索出使用方法。但是，直接使用CryptoPP真的很烦琐，索性包装 为DLL，我把它取名字叫：CryptoPP32.dll。直接使用CryptoPP32.dll，不需要任何 cryptopp5.4的库，因为我已经把cryptopp5.4静态编译进去了。
我在下面的地址：
http://www.3snews.net/index.php/5890/action_viewspace_itemid_9580.html
提供了整个工程的文件下载，包括cryptopp5.4、CryptoPP32和测试项目。用户必须使用 VC7.1打开CryptoPP32_DLL目录下的sln文件。第一次编译，必须在生成管理器中选中 cryptlib。
（我不知道CSDN如何上传文件。本人提供的下载文件，可以任意散发，复 制，但不得改变作者声明。CSDN有很多地方做的不够友好，希望改进！希望CSDN的BLOG编写 组学学http://www.3snews.net的BLOG，比你们的强很多啊！）
1 CryptoPP54与 CryptoPP32
下面是CryptoPP32.h接口文件的方法：
// CryptoPP32.DLL接口方法
...
namespace CryptoPP32
{
bool CRYPTOPP32_DLL RSAES_OAEP_GenerateKeys(const char *privFilename, const char *pubFilename, unsigned int keyLength=512, const char *seed=0);
bool CRYPTOPP32_DLL RSAES_OAEP_GenerateKeys(string& strPrivKey, string& strPubKey, unsigned int keyLength=512, const char *seed=0);
bool CRYPTOPP32_DLL RSAES_OAEP_EncryptString(const char *pubFilename, const char *message, string& cipher, const char *seed=0);
bool CRYPTOPP32_DLL RSAES_OAEP_DecryptString(const char *privFilename, const char *cipher, string& message);
bool CRYPTOPP32_DLL RSAES_OAEP_EncryptString(const string& strPubKey, const char *message, string& cipher, const char *seed=0);
bool CRYPTOPP32_DLL RSAES_OAEP_DecryptString(const string& strPrivKey, const char *cipher, string& plain);
bool CRYPTOPP32_DLL RSAES_OAEP_EncryptString(const char* N, const char* E, const char* message, string& cipher, const char* seed=0);
bool CRYPTOPP32_DLL RSAES_OAEP_DecryptString(const char* N, const char* E, const char* D, const char* P, const char* Q, const char* dP, const char* dQ, const char* U, const char* cipher, string& plain);
bool CRYPTOPP32_DLL RSAES_PKCS_GenerateKeys(const char *privFilename, const char *pubFilename, unsigned int keyLength=512, const char *seed=0);
bool CRYPTOPP32_DLL RSAES_PKCS_GenerateKeys(string& strPrivKey, string& strPubKey, unsigned int keyLength=512, const char *seed=0);
bool CRYPTOPP32_DLL RSAES_PKCS_EncryptString(const char *pubFilename, const char *message, string& cipher, const char *seed=0);
bool CRYPTOPP32_DLL RSAES_PKCS_EncryptString(const string& strPubKey, const char *message, string& cipher, const char *seed=0);
bool CRYPTOPP32_DLL RSAES_PKCS_DecryptString(const char *privFilename, const char *cipher, string& message);
bool CRYPTOPP32_DLL RSAES_PKCS_DecryptString(const string& strPrivKey, const char *cipher, string& plain);
bool CRYPTOPP32_DLL RSAES_PKCS_EncryptString(const char* N, const char* E, const char* message, string& cipher, const char* seed=0);
bool CRYPTOPP32_DLL RSAES_PKCS_DecryptString(const char* N, const char* E, const char* D, const char* P, const char* Q, const char* dP, const char* dQ, const char* U, const char* cipher, string& plain);
bool CRYPTOPP32_DLL RSASS_PKCS_Sign(const char *privFilename, const char *msgFilename, const char *signFilename, const char *hashFunc="SHA");
bool CRYPTOPP32_DLL RSASS_PKCS_Verify(const char *pubFilename, const char *msgFilename, const char *signFilename, const char *hashFunc="SHA");
bool CRYPTOPP32_DLL RSASS_PKCS_Sign(const string& strPrivKey, const char *message, string& signature, const char *hashFunc="SHA");
bool CRYPTOPP32_DLL RSASS_PKCS_Verify(const string& strPubKey, const char *message, const string& signature, const char *hashFunc="SHA");
bool CRYPTOPP32_DLL HMAC_SHA1_EncryptString(const char *inString, const char *passPhrase, string& outString);
bool CRYPTOPP32_DLL HMAC_SHA1_DecryptString(const char *inString, const char *passPhrase, string& outString);
bool CRYPTOPP32_DLL HMAC_SHA1_EncryptFile(const char *inFilename, const char *outFilename, const char *passPhrase);
bool CRYPTOPP32_DLL HMAC_SHA1_DecryptFile(const char *inFilename, const char *outFilename, const char *passPhrase);
bool CRYPTOPP32_DLL GzipFile(const char *inFilename, const char *outFilename, int deflateLevel);
bool CRYPTOPP32_DLL GunzipFile(const char *inFilename, const char *outFilename);
bool CRYPTOPP32_DLL Base64Encode(const char *inFilename, const char *outFilename);
bool CRYPTOPP32_DLL Base64Decode(const char *inFilename, const char *outFilename);
bool CRYPTOPP32_DLL Base64Encode(const char *plain, string& encoded);
bool CRYPTOPP32_DLL Base64Decode(const char *encoded, string& plain);
bool CRYPTOPP32_DLL HexEncode(const char *inFilename, const char *outFilename);
bool CRYPTOPP32_DLL HexDecode(const char *inFilename, const char *outFilename);
bool CRYPTOPP32_DLL HexEncode(const char *plain, string& encoded);
bool CRYPTOPP32_DLL HexDecode(const char *encoded, string& plain);
};