static int check_crl_chain(X509_STORE_CTX *ctx,
			STACK_OF(X509) *cert_path,
			STACK_OF(X509) *crl_path)
	{
	X509 *cert_ta, *crl_ta;
	cert_ta = sk_X509_value(cert_path, sk_X509_num(cert_path) - 1);
	crl_ta = sk_X509_value(crl_path, sk_X509_num(crl_path) - 1);
	if (!X509_cmp(cert_ta, crl_ta))
		return 1;
	return 0;
	}
['static int check_crl_chain(X509_STORE_CTX *ctx,\n\t\t\tSTACK_OF(X509) *cert_path,\n\t\t\tSTACK_OF(X509) *crl_path)\n\t{\n\tX509 *cert_ta, *crl_ta;\n\tcert_ta = sk_X509_value(cert_path, sk_X509_num(cert_path) - 1);\n\tcrl_ta = sk_X509_value(crl_path, sk_X509_num(crl_path) - 1);\n\tif (!X509_cmp(cert_ta, crl_ta))\n\t\treturn 1;\n\treturn 0;\n\t}', 'int sk_num(const _STACK *st)\n{\n\tif(st == NULL) return -1;\n\treturn st->num;\n}', 'void *sk_value(const _STACK *st, int i)\n{\n\tif(!st || (i < 0) || (i >= st->num)) return NULL;\n\treturn st->data[i];\n}', 'int X509_cmp(const X509 *a, const X509 *b)\n{\n\tX509_check_purpose((X509 *)a, -1, 0);\n\tX509_check_purpose((X509 *)b, -1, 0);\n\treturn memcmp(a->sha1_hash, b->sha1_hash, SHA_DIGEST_LENGTH);\n}']