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PBC庫傳入引數檔案問題

配置不同型別的橢圓曲線,需要修改配對型別。

PBC的param目錄下有好多種:


PBC手冊是這樣寫的

Chapter 5. Param functions

Pairings are initialized from pairing parameters, which are objects of type pbc_param_t. Some applications can ignore this data type because pairing_init_set_str() handles it behind the scenes:it reads a string as a pbc_param_t, then initializes a pairing with these parameters.

  • int pbc_param_init_set_str(pbc_param_t par, const char *s)
Initializes pairing parameters from the string s. Returns 0 if successful, 1 otherwise.

  • int pbc_param_init_set_buf(pbc_param_t par, const char *s, size_t len)          

 Same, but read at most len bytes. If len is 0, it behaves as the previous function. Returns 0 if successful, 

  • void pbc_param_out_str(FILE *stream, pbc_param_t p)
Write pairing parameters to ’stream’ in a text format.
  • void pbc_param_clear(pbc_param_t p)
Clear p. Call after p is no longer needed.



可以使用的有以下三種:

(1)Windows下直接呼叫的只有A,D,F三種類型的曲線

pairing_t pairing;
a_param_input(pairing);

(2)產生動態配引數

pairing_t pairing;
a_param_t w;
a_param_init(w);
a_param_gen(w,160,512);//取160bit,512bit最佳
pairing_init_a_param(pairing,w);
 
 

 
 

(3)自己寫的一個pbc_new.h標頭檔案

#include <stdio.h>
#include "pbc.h"
static inline void pbc_demo_pairing_init(pairing_t pairing, char* filename) {  
	char s[16384];  
	FILE *fp;  
	unsigned int count;
	fp = fopen(filename, "r");  
	if (!fp){  
      printf("error opening %s", filename);  
	}  
      count = fread(s, 1, 16384, fp);  
	if (!count){  
      printf("input error");  
	 }  
	fclose(fp);  
	pairing_init_inp_buf(pairing, s, count); }

主函式main()裡的呼叫程式碼:

#define F_PATH "d:\\a.param" 我放在D盤根目錄下
	//char* c_filepath = "d:\\a.param";  
    pbc_demo_pairing_init(pairing, F_PATH);  //pbc_new.h