CryptoPP::HashModule例子纠正

我好开心呀，我这破人终于把这个经典库的userguide里的错误改过来把程序调通了哈哈，撒花

这是Cryptopp userguide中关于hash的例子DumpHashes.cpp，偶的环境是suse9, gcc version 4.1.0：

有几个地方需要注意的：

1，CryptoPP旧版本中的HashModule已经定义为新类HashTransformation,所以所有的HashModule都要改成HashTransformation.

2, md5是一个weak算法，所以需要#define CRYPTOPP_ENABLE_NAMESPACE_WEAK 1，而在使用md5的时候也要加上weak::MD5

3, 第三个错误就是main函数里直接调用SHA()等构造函数赋值给HashTransformation，报错说错误的转换，从临时对象传给const*，只要在前面为SHA等初始化一个对象就可以了。

刚开始看到这么就懵了，觉得自己怎么可能会自己这么菜，既然没有人可以指点偶那就想想吧，刚翻开书到初始化这一页竟然就想到了，hoho,开心。虽然我知道自己真的很菜鸟嘿嘿。

4，调用HexEncoder的时候我就先懵了，竟然连传递参数这么简单的问题都不确定了hoho,即使后来对那个new仍然很不确定，问了某牛，就把new当作传地址好了...

5, 开始仍然有一堆莫名的错误，昨天下午彻底糊涂了，原来只要加上那些必要的头文件这些错误都会自动消失的嘿嘿。

6，其余错误都是小case啦，木有技术含量。

如下：[code]//codes in userguide, cryptlib.h, DumpHashes.cpp
#include "./cryptlib/hex.h"
#include "./cryptlib/files.h"
#include "./cryptlib/cryptlib.h"
#define CRYPTOPP_ENABLE_NAMESPACE_WEAK 1

#include
#include

using namespace std;
using namespace CryptoPP;

void DumpHash_SingleStep(CryptoPP::HashTransformation& hash, char const* szModuleName, std::string const& strData) {
//Can't use std::string for buffer;
// its internal storage might not be contiguous
SecByteBlock sbbDigest(hash.DigestSize());

hash.CalculateDigest(sbbDigest.begin(), (byte const*) strData.data(), strData.size());

cout << szModuleName << "SS:";
HexEncoder(new FileSink(cout)).Put(sbbDigest.begin(), sbbDigest.size());
cout << endl;
}

void DumpHash_MultiStep(CryptoPP::HashTransformation& hash, char const* szModuleName, std::string const& strDataPart1, std::string const& strDataPart2, std::string const& strDataPart3){
hash.Update((byte const*) strDataPart1.data(), strDataPart1.size());
hash.Update((byte const*) strDataPart2.data(), strDataPart2.size());
hash.Update((byte const*) strDataPart3.data(), strDataPart3.size());

//can't use std::string for buffer;
//its internal storage might not be contiguous
SecByteBlock sbbDigest(hash.DigestSize());

hash.Final(sbbDigest.begin());

cout << szModuleName << "MS";
HexEncoder(new FileSink(cout)).Put(sbbDigest.begin(), sbbDigest.size());
cout << endl;
}

void DumpHash_HashFilter(CryptoPP::HashTransformation& hash, char const* szModuleName, std::string const& strDataPart1, std::string const& strDataPart2, std::string const& strDataPart3){
//Here, we are free to use std::string as the destination,
//because StringSink uses the correct std::string interface to append data
string strDigest;
HashFilter hashFilter(hash, new StringSink(strDigest));
hashFilter.Put((byte const*) strDataPart1.data(), strDataPart1.size());
hashFilter.Put((byte const*) strDataPart2.data(), strDataPart2.size());
hashFilter.Put((byte const*) strDataPart3.data(), strDataPart3.size());
hashFilter.MessageEnd();

cout << szModuleName << "HF:";
StringSource(strDigest, true, new HexEncoder(new FileSink(cout)));
cout << endl;
}

void DumpHash(CryptoPP::HashTransformation& hash, char const* szModuleName, std::string const& strDataPart1, std::string const& strDataPart2, std::string const& strDataPart3){
DumpHash_SingleStep(hash, szModuleName, strDataPart1 + strDataPart2 + strDataPart3);
DumpHash_MultiStep(hash, szModuleName, strDataPart1, strDataPart2, strDataPart3);
DumpHash_HashFilter(hash, szModuleName, strDataPart1, strDataPart2, strDataPart3);
}

//Crypto++
#include "./cryptlib/sha.h"
#include "./cryptlib/ripemd.h"
#include "./cryptlib/md5.h"
#include "./cryptlib/crc.h"

int main(){
using namespace std;
using namespace CryptoPP;

SHA sha;
SHA256 sha256;
RIPEMD160 ripemd160;
Weak::MD5 md5;
CRC32 crc32;

std::string strDataPart1 = "part 1;";
std::string strDataPart2 = "part two;";
std::string strDataPart3 = "PART THREE;";

try{
DumpHash(sha, "SHA", strDataPart1, strDataPart2, strDataPart3);
DumpHash(sha256, "SHA256", strDataPart1, strDataPart2, strDataPart3);
DumpHash(ripemd160, "RIPEMD160", strDataPart1, strDataPart2, strDataPart3);
DumpHash(md5, "MD5", strDataPart1, strDataPart2, strDataPart3);
DumpHash(crc32, "CRC32", strDataPart1, strDataPart2, strDataPart3);
}
catch(CryptoPP::Exception const& e){
cout << "CryptoPP::Exception caught:" << endl
<< e.what() << endl;
return 1;
}
}[/code]ZZ：violetfeeling