openssl3.2 - exp - generate prime

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openssl3.2 - exp - generate prime

概述

openssl3.2.命令行可以生成质数

openssl prime -generate -bits 256 -hex -safe

单步调试openssl.exe工程, 整理了一个函数, 用openssl API来产生质数.
openssl命令行是将结果打印到UI上, 我是要将大数结果放到buffer中.
查了openssl源码, 可以用BN_bn2binpad()来干这个活.

笔记

/*!
* \file main.cpp
* \note exp014_gen_prime
* openssl3.2 - exp - generate prime
* 用命令行产生质数 => openssl prime -generate -bits 256 -hex -safe
* openssl源码处理主函数 prime_main()
*/#include "my_openSSL_lib.h"
#include <openssl/crypto.h>
#include <openssl/bio.h>#include <openssl/bn.h>#include <stdlib.h>
#include <stdio.h>
#include <assert.h>#include "CMemHookRec.h"void my_openssl_app();
bool my_gen_prime(int bits, int safe, UCHAR*& pBuf, int&lenBuf);
bool bn_data_to_bio(BIGNUM* bn, BIO* bio);int main(int argc, char** argv)
{setvbuf(stdout, NULL, _IONBF, 0); // 清掉stdout缓存, 防止调用printf时阻塞mem_hook();my_openssl_app();mem_unhook();/*! run resultgenerate safe prime(256bits) below:0000 - d8 a6 2b e1 a9 c2 42 de-f4 e1 c9 36 c6 e9 8e 7e   ..+...B....6...~0010 - a3 ec 19 03 55 dd e8 f9-17 61 7c f2 03 d4 1a 6b   ....U....a|....kfree map, g_mem_hook_map.size() = 0*/return 0;
}void my_openssl_app()
{UCHAR* pBuf = NULL;int lenBuf = 0;bool b_rc = false;do {printf("generate safe prime(256bits) below:\n");b_rc = my_gen_prime(8 * 32, 1, pBuf, lenBuf);if (!b_rc){printf("err\n");break;}BIO_dump_fp(stdout, pBuf, lenBuf);} while (false);if (NULL != pBuf){OPENSSL_free(pBuf);pBuf = NULL;}
}bool my_gen_prime(int bits, int safe, UCHAR*& pBuf, int& lenBuf)
{BIGNUM* bn = NULL;int i_rc = 0;bool b_rc = false;do {bn = BN_new();if (NULL == bn){break;}i_rc = BN_generate_prime_ex(bn, bits, safe, NULL, NULL, NULL);if (1 != i_rc){break;}lenBuf = BN_num_bytes(bn);if (lenBuf <= 0){break;}pBuf = (UCHAR*)OPENSSL_zalloc(lenBuf);if (NULL == pBuf){break;}i_rc = BN_bn2binpad(bn, pBuf, lenBuf);if (lenBuf != i_rc){break;}b_rc = true;} while (false);if (NULL != bn){BN_free(bn);bn = NULL;}return b_rc;
}

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