openssl ASN1 string格式存储为pem文件

今天书接上回，接着讨论本地pem格式存储密钥的问题。方世玉的干爹说过，功夫不用是会贬值的。今天我深刻的体会到了这一点，所以复习了好一会才恢复功力。

首先封装了ASN1 string对象的i2d和d2i函数
[code=c]
int i2d_string(void* a,unsigned char** pp)
{
    i2d_ASN1_bytes((ASN1_STRING*)a,pp,12,V_ASN1_UNIVERSAL);//((ASN1_STRING*)a)->type
}
ASN1_STRING *d2i_string(ASN1_STRING **a, const unsigned char **in, long len)
{
    return d2i_ASN1_bytes(a, in,
      len, 12, V_ASN1_UNIVERSAL);
}
[/code]

然后我再封装了串行化和反串行化函数
[code=c]
int c2file(uint8_t *data,int len,const char* file,const char *name)
{
    BIO *bp;
    int ret2;
    bp=BIO_new_file(file,"w");
    ASN1_STRING *str = ASN1_STRING_type_new(V_ASN1_PRINTABLESTRING) ;
    ASN1_STRING_set(str , data  , len);
    PEM_ASN1_write_bio(i2d_string,name,bp,str,EVP_des_ede3_cbc(),NULL,NULL,NULL,NULL);
    /*ret2=PEM_write_bio(bp,name,"",data,len);
    if(ret2 == 0)
    {
        cerr << "write data error" << endl;
        return -1;
    }*/
    BIO_free(bp);
    return 0;
}
int file2c(uint8_t *cdata,int clen,const char* file,const char* cname)
{
    BIO *bp;
    char *name=NULL,*header=NULL;
    unsigned char *data=NULL;
    long len = 0;
    int ret2;
    BIO *bio_err=BIO_new_fp(stderr,BIO_NOCLOSE);
    bp=BIO_new_file(file,"r");
    /*
    ret2=PEM_read_bio(bp,&name,&header,&data,&len);
    if(ret2 == 0 )
    {
        cerr << "read data error " << len << endl;
        return -1;
    }
    OPENSSL_free(name);
    OPENSSL_free(header);
    memcpy(cdata,data,min((int)len,clen));
    OPENSSL_free(data);
    */
    ASN1_STRING *str;
    PEM_ASN1_read_bio((d2i_of_void*)d2i_string,cname,bp,(void**)&str,NULL,NULL);
    if (!str)
    {
        BIO_printf(bio_err,"unable to load CRL\n");
        ERR_print_errors(bio_err);
        return -1;
    }
    memcpy(cdata,ASN1_STRING_data(str),min(ASN1_STRING_length(str),clen));
    BIO_free(bp);
    return 0;
}
[/code]
测试代码如下：
[code=c]
TEST(cip,cip)
{
    cipher cp;
    cp.serial("kfile","ivfile");
}
TEST(cip1,cip1)
{
    cipher cp;
    cp.update("kfile","ivfile");
}
[/code]
测试结果：
[==========] Running 2 tests from 2 test cases.
[----------] Global test environment set-up.
[----------] 1 test from cip
[ RUN      ] cip.cip
Enter PEM pass phrase:
Verifying - Enter PEM pass phrase:
Enter PEM pass phrase:
Verifying - Enter PEM pass phrase:
[       OK ] cip.cip (4886 ms)
[----------] 1 test from cip (4886 ms total)
[----------] 1 test from cip1
[ RUN      ] cip1.cip1
Enter PEM pass phrase:
Enter PEM pass phrase:
[       OK ] cip1.cip1 (2746 ms)
[----------] 1 test from cip1 (2746 ms total)
[----------] Global test environment tear-down
[==========] 2 tests from 2 test cases ran. (7633 ms total)
[  PASSED  ] 2 tests.