verfiy.cpp

viusal c++ 中调用openssl源码 实现数字签名； 比较适合初学openssl API的人

#include <string.h>
//	#include <openssl/comp.h>
#include <stdio.h>
#include <openssl/rsa.h>
#pragma comment(lib, "libeay32.lib") 
#pragma comment(lib, "ssleay32.lib")

	#include <string.h>
		#include <openssl/objects.h>
		#include <openssl/rsa.h>
		
		int	main()
		{
		int				ret;
		RSA				*r;
		int				i,bits=1024,signlen,datalen,alg,nid;
		unsigned long	e=RSA_3;
		BIGNUM			*bne;
		unsigned char	data[100],signret[200];
	
		bne=BN_new();
		ret=BN_set_word(bne,e);
		r=RSA_new();
		ret=RSA_generate_key_ex(r,bits,bne,NULL);
		if(ret!=1)
		{
			printf("RSA_generate_key_ex err!\n");
			return -1;
		}
	
		for(i=0;i<100;i++)
			memset(&data[i],i+1,1);
		printf("please select digest alg: \n");
		printf("1.NID_md5\n");
		printf("2.NID_sha\n");
		printf("3.NID_sha1\n");
		printf("4.NID_md5_sha1\n");
		scanf("%d",&alg);
		if(alg==1)
		{
			datalen=55;
			nid=NID_md5;
		}
		else if(alg==2)
		{
			datalen=55;
			nid=NID_sha;
		}
		else if(alg==3)
		{
			datalen=55;
			nid=NID_sha1;
		}
		else if(alg==4)
		{
			datalen=36;
			nid=NID_md5_sha1;
		}
		ret=RSA_sign(nid,data,datalen,signret,(unsigned *)&signlen,r);
		if(ret!=1)
		{
			printf("RSA_sign err!\n");
			RSA_free(r);
			return -1;
		}
		ret=RSA_verify(nid,data,datalen,signret,signlen,r);
		if(ret!=1)
		{
			printf("RSA_verify err!\n");
			RSA_free(r);
			return -1;
		}
		RSA_free(r);
		printf("test ok!\n");
		return 0;
	}