openssl主要流程程序代码(一)

 
// CA.cpp : Defines the entry point for the DLL application.      
//      
#define sprintf_s sprintf       
#include "stdafx.h"      
#include       
#include "ca.h"      
#include       
#include       
#include       
#include       
#include       
#include      
#include      
#include       
#define EXT_COPY_NONE   0      
#define EXT_COPY_ADD    1      
#define EXT_COPY_ALL    2      
     
     
BOOL APIENTRY DllMain( HANDLE hModule,      
                       DWORD  ul_reason_for_call,      
                       LPVOID lpReserved     
                     )     
{     
    return TRUE;     
}     
     
/*此函数可以将DER、PEM、P12文件公钥读出来*/     
X509 *load_cert(BIO *cert/*输入BIO*/, int format/*格式*/,char * pwd,/*P12密码*/     
                char * outMsg) //从DER、PEM、P12格式中读取公钥证书      
{     
    X509 * x=NULL;     
    if  (format == DER)     
        x=d2i_X509_bio(cert,NULL);     
    else if (format == PEM)     
        x=PEM_read_bio_X509(cert,NULL,NULL,NULL);//PEM_read_bio_X509_AUX      
    else if (format == P12)     
    {     
        PKCS12 *p12 = d2i_PKCS12_bio(cert, NULL);     
        PKCS12_parse(p12, pwd, NULL, &x, NULL);     
        PKCS12_free(p12);     
        p12 = NULL;     
    }     
    else     
    {     
             
sprintf_s(outMsg,"bad input format specified for input cert\n");     
        goto end;     
    }     
end:     
    if (x == NULL)     
    {     
        sprintf(outMsg,"unable to load certificate\n");     
    }     
    return(x);     
}     
     
X509 * LoadCert(char * cert,int certlen,char * outMsg)//枚举DER/PEM格式      
{     
    BIO * in=NULL;     
    X509 * x509=NULL;     
     
    if(certlen==0)//输入为磁盘文件      
    {     
        if((in=BIO_new_file(cert, "r")) == NULL)     
        {     
            sprintf(outMsg,"open CA certificate file error");     
            return NULL;     
        }     
    }     
    else//输入为内存中文件      
    {     
        if((in=BIO_new_mem_buf(cert,certlen))== NULL)//只读类型      
        {     
            sprintf(outMsg,"Make Mem Bio Error");     
            return NULL;     
        }     
    }     
    if((x509=load_cert(in,DER,NULL,outMsg))==NULL)//尝试DER      
    {     
        BIO_reset(in);//恢复bio      
        x509=load_cert(in,PEM,NULL,outMsg);//尝试PEM      
    }     
    if (in != NULL) BIO_free(in);     
    return x509;     
}     
     
EVP_PKEY *load_key(BIO *bio, int format, char *pass,char * outMsg)//枚举DER/PEM格式      
{     
    EVP_PKEY *pkey=NULL;     
     
    if (format == DER)     
    {     
        pkey=d2i_PrivateKey_bio(bio, NULL);     
    }     
    else if (format == PEM)     
    {     
        pkey=PEM_read_bio_PrivateKey(bio,NULL,NULL,pass);     
    }     
    else if (format == P12)     
    {     
        PKCS12 *p12 = d2i_PKCS12_bio(bio, NULL);     
        PKCS12_parse(p12, pass, &pkey, NULL, NULL);     
        PKCS12_free(p12);     
        p12 = NULL;     
    }     
    else     
    {     
        sprintf(outMsg,"bad input format specified for key\n");     
        goto end;     
    }     
end:     
    if (pkey == NULL)     
        sprintf(outMsg,"unable to load Private Key\n");     
    return(pkey);     
}     
     
EVP_PKEY * LoadKey(char * key,int keylen,char * pass,char * outMsg)     
{     
    EVP_PKEY *pkey=NULL;     
    BIO * in=NULL;     
     
    if(keylen==0)//输入为磁盘文件      
    {     
        if((in=BIO_new_file(key, "r")) == NULL)     
        {     
            sprintf(outMsg,"open CA certificate file error");     
            return NULL;     
        }     
    }     
    else//输入为内存中文件      
    {     
        if((in=BIO_new_mem_buf(key,keylen))== NULL)//只读类型      
        {     
            sprintf(outMsg,"Make Mem Bio Error");     
            return NULL;     
        }     
    }     
     
    if((pkey=load_key(in,DER,pass,outMsg))==NULL)//尝试DER      
    {     
        BIO_reset(in);//BIO是可读写的，那么该BIO所有数据都会被清空；      
                        //如果该BIO是只读的，那么该操作只会简单将指      
                        //针指向原始位置，里面的数据可以再读.      
        pkey=load_key(in,PEM,pass,outMsg);//尝试PEM      
    }     
    if (in != NULL) BIO_free(in);     
    return pkey;     
}     
int Rand(const char *file,int dont_warn,char * outMsg)//产生随机数,return 0 ---成功      
{     
    int consider_randfile = (file == NULL);     
    char buffer[200];     
         
    RAND_screen();     
    if (file == NULL)     
        file = RAND_file_name(buffer, sizeof buffer);     
    else if (RAND_egd(file) >





 0)     
    {     
    /* we try if the given filename is an EGD socket.   
        if it is, we don't write anything back to the file. */     
        return 1;     
    }     
    if (file == NULL || !RAND_l