Hello:
I want read a certificate, and I use the function "PEM_read_X509". Then, I
get the serial number and the subject name.
I have done it with success reading a certain certificate, but when I read
other certificate I have get a read error. And this certificate it´s ok.
Both certificates are in format ".crt".
This is the funcion that I use to read the certificates:
BIGNUM *ClavePublicaCertificado(char *certificado)
{
BIO *out;
FILE *fp;
X509 *cert;
X509_NAME *asunto;
ASN1_INTEGER *bs;
char *serialHex;
BIGNUM *serialBN = NULL;
int error;
// abre la salida estandar //
if (!(out = BIO_new_fp (stdout, BIO_NOCLOSE)))
printf("Error creating stdout BIO\n");
if (!(fp = fopen(certificado, "r")))
printf ("Error lectura certificado (%s)\n", certificado);
if (!(cert = PEM_read_X509(fp, NULL, NULL, NULL)))
printf ("Error leyendo certificado (%s)\n", certificado);
fclose(fp);
bs = X509_get_serialNumber(cert);
serialBN = ASN1_INTEGER_to_BN(bs,NULL);
serialHex = BN_bn2hex(serialBN);
asunto = X509_get_subject_name(cert);
X509_NAME_print (out, asunto, 0);
return (serialBN);
}
What is the problem?. Is the problem the certificate, o is this code?
Thanks a lot.
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