AES密钥生成问题

[玉宇逍遥]

现在在做项目，需要使用Openssl的AES算法进行加密和解密。JAVA可以使用：

//KeyGenerator提供对称密钥生成器的功能，支持各种算法          
KeyGenerator keygen = KeyGenerator.getInstance("AES");
//SecretKey负责保存对称密钥           
SecretKey deskey = keygen.generateKey();  

这个自动生成密钥，但是VC使用Openssl该怎么做？
JAVA默认支持的是128bit 但是也可以通过安装一个SUN提供的工具生成192bit和256bit的KEY
请问用VC该怎么实现JAVA这样的自动密钥的生成？
在线急等！

[玉宇逍遥]

难道要沉吗？有人给点提点吗？谢谢了！

[chunyou128]

http://www.mathmagic.cn/bbs/read.php?tid=10054

[rendao0563]

aes.h

#pragma once

#include "OpenSSL/aes.h"

//wrapper class for AES encryption

class CAES
{
public:
        CAES(void);
        ~CAES(void);

        void Decrypt(const unsigned char *in, int length, unsigned char *out);
        void Encrypt(const unsigned char *in, int length, unsigned char *out);

        int SetDecryptKey(const unsigned char *userKey, const int bits);
        int SetEncryptKey(const unsigned char *userKey, const int bits);

protected:
        void CryptData(const unsigned char *in, unsigned char *out, int length, const int enc);

protected:
        AES_KEY m_aesEncKey;
        AES_KEY m_aesDecKey;

public:
        unsigned char m_userDecKey[128];
        unsigned char m_userEncKey[128];
};

aes.cpp

#include "aes.h"

CAES::CAES(void)
{
}

CAES::~CAES(void)
{
}

void CAES::Decrypt(const unsigned char *in, int length, unsigned char *out)
{
        CryptData(in, out, length, AES_DECRYPT);
}

void CAES::Encrypt(const unsigned char *in, int length, unsigned char *out)
{
        CryptData(in, out, length, AES_ENCRYPT);
}

int CAES::SetDecryptKey(const unsigned char *userKey, const int bits)
{
        //return AES_set_decrypt_key(userKey, bits, &m_aesDecKey);

        memcpy(m_userDecKey, userKey, bits);
        return 0;
}

int CAES::SetEncryptKey(const unsigned char *userKey, const int bits)
{
        //return AES_set_encrypt_key(userKey, bits, &m_aesEncKey);
        memcpy(m_userEncKey, userKey, bits);
        return 0;
}

void CAES::CryptData(const unsigned char *in, unsigned char *out, int length, const int enc)
{
        AES_KEY aesKey;
        if (AES_ENCRYPT == enc)
                AES_set_encrypt_key(m_userEncKey, 128, &aesKey);
        else
                AES_set_decrypt_key(m_userDecKey, 128, &aesKey);

        unsigned long len = length;
        unsigned char tmp[AES_BLOCK_SIZE];

        while (len >= AES_BLOCK_SIZE)
        {
                memset(tmp,0,AES_BLOCK_SIZE);
                memcpy(tmp,in,AES_BLOCK_SIZE);

                if (AES_ENCRYPT == enc)
                {
                        AES_encrypt(tmp, out, &aesKey);
                }
                else
                {
                        AES_decrypt(tmp, out, &aesKey);
                }

                len -= AES_BLOCK_SIZE;
                in += AES_BLOCK_SIZE;
                out += AES_BLOCK_SIZE;
        }

        if (len)
        {
                memset(tmp,0,AES_BLOCK_SIZE);
                memcpy(tmp,in,AES_BLOCK_SIZE);
                if (AES_ENCRYPT == enc)
                {
                        AES_encrypt(tmp, tmp, &aesKey);
                }
                else
                {
                        AES_decrypt(tmp, tmp, &aesKey);
                }
                memcpy(out, tmp, AES_BLOCK_SIZE);
        }
}

[shn521]

帮顶啦

[玉宇逍遥]

[Quote=引用 1 楼 rendao0563 的回复:]

aes.h
C/C++ code

#pragma once

#include "OpenSSL/aes.h"

//wrapper class for AES encryption

class CAES
{
public:
CAES(void);
~CAES(void);

void Decrypt(const unsigned char……
[/Quote]

你说的自动生成的密钥是哪个函数？你的函数都需要除const int bits的其他的输入。能帮忙解释一下你那些函数的作用吗？

[玉宇逍遥]

//KeyGenerator提供对称密钥生成器的功能，支持各种算法          
KeyGenerator keygen = KeyGenerator.getInstance("AES");
//SecretKey负责保存对称密钥           
SecretKey deskey = keygen.generateKey();  
//打印密钥
string strkey;
BASE64Encoder   base64E   =   new   BASE64Encoder(); 
strkey   =   base64E.encode(deskey.getEncoded()); 

JAVA中的这段话用openssl中的AES和Base64该怎么实现？

[玉宇逍遥]

string strkey;
BASE64Encoder base64E = new BASE64Encoder();
strkey = base64E.encode(deskey.getEncoded());

这一段我懂该怎么做，但是前面生成deskey的这一段该怎么用C++和Openssl来实现？

[玉宇逍遥]

有没有人了解C++怎么实现JAVA中下面的两句话啊：

//KeyGenerator提供对称密钥生成器的功能，支持各种算法          
KeyGenerator keygen = KeyGenerator.getInstance("AES");
//SecretKey负责保存对称密钥           
SecretKey deskey = keygen.generateKey();