Re: SHA 256 Cert

[Marek Marcola]

Hello,
> How do i find it through the X509 struct ?
> X509 *myX509 = ....
> is this the field ?
> myX509->sig_alg->algorithm->nid
In general: myX509->sig_alg->algorithm object.

pkcs-1 OBJECT IDENTIFIER ::= {
iso(1) member-body(2) us(840) rsadsi(113549) pkcs(1) 1
}
sha256WithRSAEncryption OBJECT IDENTIFIER ::= { pkcs-1 11 }

which means: 1.2.840.113549.1.1.11

I've attached simple test code.

Best regards,
-- 
Marek Marcola <[EMAIL PROTECTED]>

#include <stdio.h>
#include <errno.h>

#include <openssl/x509.h>
#include <openssl/ssl.h>

int main()
{
	X509 *x509 = NULL;
	FILE *fp;
	BIO *b;
	char buf[80];

	SSL_load_error_strings();
	SSLeay_add_all_algorithms();

	if ((fp = fopen("./1037.pem", "r")) == NULL) {
		fprintf(stderr, "fopen: %s\n", strerror(errno));
		goto err;
	}

	if ((x509 = PEM_read_X509(fp, NULL, NULL, NULL)) == NULL) {
		ERR_print_errors_fp(stderr);
		goto err;
	}

	/* first print */
	if ((b = BIO_new(BIO_s_file())) == NULL) {
		goto err;
	}
	BIO_set_fp(b, stdout, BIO_NOCLOSE);
	BIO_puts(b, "1) Signature algorithm: ");
	i2a_ASN1_OBJECT(b, x509->sig_alg->algorithm);
	BIO_puts(b, "\n");
	BIO_free(b);

	/* second print */
	i2t_ASN1_OBJECT(buf, sizeof(buf), x509->sig_alg->algorithm);
	printf("2) Signature algorithm: %s\n", buf);

	return (0);

  err:
	return (1);
}