ecc 非对称加密

安全性高

有研究表示160位的椭圆密钥与1024位的RSA密钥安全性相同。

处理速度快

在私钥的加密解密速度上，ecc算法比RSA、DSA速度更快。

• 存储空间占用小。

• 带宽要求低。 [1]

#include "stdafx.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "ecc_en.h"




#ifdef _WIN64

#ifdef _DEBUG
#pragma comment(lib,"ecc_d_x64.lib")
#else
#pragma comment(lib,"ecc_x64.lib")
#endif



#else

#ifdef _DEBUG
#pragma comment(lib,"ecc_d.lib")
#else
#pragma comment(lib,"ecc.lib")
#endif

#endif




int processor(int iteration) {

int nRet =0;
int tlen;
int olen;

char *hex_pub = NULL, *hex_priv = NULL;
unsigned char *text = NULL, *copy = NULL, *original = NULL;
char*en_buf = NULL;
int nen_len =0;

// Generate random size for the block of data were going to encrypt. 
//Use a min value of 1 KB and a max of 1 MB.
do {
tlen = (rand() % (1024 * 1024));
} while (tlen < 1024);

if (!(text = (unsigned char*)malloc(tlen 1)) || !(copy = (unsigned char *)malloc(tlen 1))) {
printf("Memory error.\n");
return -1;
}

// Wipe and then fill the data blocks with random data.
memset(copy, 0, tlen 1);
memset(text, 0, tlen 1);
for (int j = 0; j < tlen; j ) {
*(copy j) = *(text j) = (rand() % 255);
}


if(!ecc_get_private_public_key(&hex_priv,&hex_pub))
{
printf("ecc_get_private_public_key in fail:\n");
return -1;
}

printf("prv:%s\n",hex_priv);
printf("pub:%s\n",hex_pub);

do 
{

if(!ecc_encrypt_buf(hex_pub,(char*)text,tlen,&en_buf,&nen_len))
{
printf("The encryption process failed!\n");
nRet =-1;
break;
}

if(!ecc_decrypt_buf(hex_priv,en_buf,nen_len,(char**)&original,&olen))
{
printf("The decryption process failed!\n");
nRet =  -1;
break;
}

if (olen != tlen || memcmp(original, copy, tlen)) {
printf("Comparison failure.\n");
nRet = -1;
break;
}


nRet =1;


} while (0);


if(hex_pub)
free(hex_pub);
if(hex_priv)
free(hex_priv);

if(copy)
free(copy);
if(text)
free(text);

if(en_buf)
free(en_buf);
if(original)
free(original);


if(!nRet)
getchar();

printf(" ... %i ... %i\n", iteration 1, nRet);

return nRet;
}



int _tmain(int argc, _TCHAR* argv[])
{
size_t nMaxCurveCount =0;

   if(-1==ecc_init(0,&nMaxCurveCount))
   {
   printf("ecc_init in fail! (nid > nMaxCurveCount\n");
   return -1;
   }

for (int i = 0; i < 100; i ) {
if (!processor(i)) {

getchar();
return 1;
}
}


getchar();
return 0;
}