c语言实现签名和签名验证

#include 
#include 
#include 
#include  
#include 

void print_Hash(unsigned char *md, int len)
{

	int i = 0;
	printf("===============hash: ");
	for (i = 0; i < len; i++)
	{
		printf("%02x", md[i]);
	}

	printf("\n\n\n");
}


EVP_PKEY *PEM_read_PublicKey(FILE *fp)
{
	BIO *b;
	EVP_PKEY *ret;

	if ((b=BIO_new(BIO_s_file())) == NULL)
	{
		PEMerr(PEM_F_PEM_READ_PRIVATEKEY,ERR_R_BUF_LIB);
		return(0);
	}
	BIO_set_fp(b,fp,BIO_NOCLOSE);
	ret=PEM_read_bio_PUBKEY(b, NULL, NULL, NULL);
	BIO_free(b);
	return(ret);
}

/*读取私钥*/
EVP_PKEY* Read_PrivateKey(char* p_KeyPath)
{	
	FILE *fp = NULL; 
	char szKeyPath[1024];
	EVP_PKEY  *priRsa = NULL, *pubRsa = NULL, *pOut = NULL;

	/*	打开密钥文件 */
	if(NULL == (fp = fopen(p_KeyPath, "r")))
	{
		Error_Printf( "fopen[%s] failed \n", p_KeyPath);
		return NULL;
	}
	/*	获取私密钥 */
	priRsa = PEM_read_PrivateKey(fp, NULL, NULL,NULL);
	if(NULL == priRsa)
	{
		ERR_print_errors_fp(stdout);
		Error_Printf("PEM_read_PrivateKey failed !!!\n");
		fclose(fp);
		return NULL;
	}
	fclose(fp);