Re: Extract of Public key and Serial number from Certificate

[praveenpvs]

I am having some problem with the following piece of code..

When I extracted the public key and saved to file, the Public key file looks
like:

-----BEGIN PUBLIC KEY-----
MIGdMA0GCSqGSIb3DQEBAQUAA4GLADCBhwKBgQCcKeojdze5WBip9ZT5GzNu6gcg
X/Vw4hftCDIQ5TQ6DHDxKxBfapCgKx/4tIgomsm3P9Q6JjhxOZjv/zOvlmQDtVb5
qnNnV8TxnA5n8LT7lrgKX2aiPVLmmaA2VnpAetL7shUUy46Tu+prSIIne3n80vRI
5vR7e5ghrRZAGSs2YQIBAw==
-----END PUBLIC KEY

The above Public key is not valid. It misses out ------ at the end.

I am not able to figure out what is problem.
Any suggestions/thoughts??

Thank you


Thanks Stephen and Dave....Thank you very much for your inputs..

X509 *x509;


int main()
{
 x509 = NULL; 
fp=fopen("RSAKey.cer","rb"); 
        if(fp == NULL)
        {
                printf("Could not open the file \n");
                return 0;
        }
        else
        {
                printf("Certificate file opened successfully \n");
        }
        
        x509 = PEM_read_X509(fp,NULL,NULL,NULL); 
        if(x509 == NULL)
        {
                printf("error reading \n"); 
        }
        else 
        {
                printf("reading success\n"); 
                ExtractSerialNumber();
                ExtractPubKey();
        }
        fclose(fp); 
        X509_free(x509);
}
int ExtractSerialNumber()
{
        ASN1_INTEGER *ptr;
        int iIndex = 0;
        printf("Entered func - ExtractSerialNumber\n");
        ptr = X509_get_serialNumber(x509);
                
        printf("\nThe length of the serial number is %d \n",ptr->length);
        while(iIndex < (int)ptr->length )
        {
                sprintf(gszSerialNumber+iIndex*2, "%0.2X",ptr->data[iIndex++]);
        }
        printf("Serial Number is = %s\n", gszSerialNumber);
        return 1;
}

int ExtractPubKey()
{
        FILE *fp; 
        EVP_PKEY *PubKey;
        int iRetVal = 0;
        printf("Entered func - ExtractPubKey\n");
        fp = fopen("RSAPubKey.Dat", "w+");
        if(fp == NULL)
        {
                printf("Some problem with the file opening/creation \n");
                return 0;
        }
        else
        {
                printf("File is opened \n");
        }
        PubKey = X509_get_pubkey(x509);
        iRetVal = PEM_write_PUBKEY(fp, PubKey);
        printf("The return value of PEM_write_PUBKEY is %d \n", iRetVal);
        free(fp);
        return iRetVal;
}
 
Thank you very much....

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