tasn_enc.c

OpenSSL 0.9.8k 最新版OpenSSL

			skaclass = V_ASN1_UNIVERSAL;
			if (isset)
				sktag = V_ASN1_SET;
			else sktag = V_ASN1_SEQUENCE;
			}

		/* Determine total length of items */
		skcontlen = 0;
		for (i = 0; i < sk_ASN1_VALUE_num(sk); i++)
			{
			skitem = sk_ASN1_VALUE_value(sk, i);
			skcontlen += ASN1_item_ex_i2d(&skitem, NULL,
						ASN1_ITEM_ptr(tt->item),
							-1, iclass);
			}
		sklen = ASN1_object_size(ndef, skcontlen, sktag);
		/* If EXPLICIT need length of surrounding tag */
		if (flags & ASN1_TFLG_EXPTAG)
			ret = ASN1_object_size(ndef, sklen, ttag);
		else ret = sklen;

		if (!out)
			return ret;

		/* Now encode this lot... */
		/* EXPLICIT tag */
		if (flags & ASN1_TFLG_EXPTAG)
			ASN1_put_object(out, ndef, sklen, ttag, tclass);
		/* SET or SEQUENCE and IMPLICIT tag */
		ASN1_put_object(out, ndef, skcontlen, sktag, skaclass);
		/* And the stuff itself */
		asn1_set_seq_out(sk, out, skcontlen, ASN1_ITEM_ptr(tt->item),
								isset, iclass);
		if (ndef == 2)
			{
			ASN1_put_eoc(out);
			if (flags & ASN1_TFLG_EXPTAG)
				ASN1_put_eoc(out);
			}

		return ret;
		}

	if (flags & ASN1_TFLG_EXPTAG)
		{
		/* EXPLICIT tagging */
		/* Find length of tagged item */
		i = ASN1_item_ex_i2d(pval, NULL, ASN1_ITEM_ptr(tt->item),
								-1, iclass);
		if (!i)
			return 0;
		/* Find length of EXPLICIT tag */
		ret = ASN1_object_size(ndef, i, ttag);
		if (out)
			{
			/* Output tag and item */
			ASN1_put_object(out, ndef, i, ttag, tclass);
			ASN1_item_ex_i2d(pval, out, ASN1_ITEM_ptr(tt->item),
								-1, iclass);
			if (ndef == 2)
				ASN1_put_eoc(out);
			}
		return ret;
		}

	/* Either normal or IMPLICIT tagging: combine class and flags */
	return ASN1_item_ex_i2d(pval, out, ASN1_ITEM_ptr(tt->item),
						ttag, tclass | iclass);

}

/* Temporary structure used to hold DER encoding of items for SET OF */

typedef	struct {
	unsigned char *data;
	int length;
	ASN1_VALUE *field;
} DER_ENC;

static int der_cmp(const void *a, const void *b)
	{
	const DER_ENC *d1 = a, *d2 = b;
	int cmplen, i;
	cmplen = (d1->length < d2->length) ? d1->length : d2->length;
	i = memcmp(d1->data, d2->data, cmplen);
	if (i)
		return i;
	return d1->length - d2->length;
	}

/* Output the content octets of SET OF or SEQUENCE OF */

static int asn1_set_seq_out(STACK_OF(ASN1_VALUE) *sk, unsigned char **out,
					int skcontlen, const ASN1_ITEM *item,
					int do_sort, int iclass)
	{
	int i;
	ASN1_VALUE *skitem;
	unsigned char *tmpdat = NULL, *p = NULL;
	DER_ENC *derlst = NULL, *tder;
	if (do_sort)
		 {
		/* Don't need to sort less than 2 items */
		if (sk_ASN1_VALUE_num(sk) < 2)
			do_sort = 0;
		else
			{
			derlst = OPENSSL_malloc(sk_ASN1_VALUE_num(sk)
						* sizeof(*derlst));
			tmpdat = OPENSSL_malloc(skcontlen);
			if (!derlst || !tmpdat)
				return 0;
			}
		}
	/* If not sorting just output each item */
	if (!do_sort)
		{
		for (i = 0; i < sk_ASN1_VALUE_num(sk); i++)
			{
			skitem = sk_ASN1_VALUE_value(sk, i);
			ASN1_item_ex_i2d(&skitem, out, item, -1, iclass);
			}
		return 1;
		}
	p = tmpdat;

	/* Doing sort: build up a list of each member's DER encoding */
	for (i = 0, tder = derlst; i < sk_ASN1_VALUE_num(sk); i++, tder++)
		{
		skitem = sk_ASN1_VALUE_value(sk, i);
		tder->data = p;
		tder->length = ASN1_item_ex_i2d(&skitem, &p, item, -1, iclass);
		tder->field = skitem;
		}

	/* Now sort them */
	qsort(derlst, sk_ASN1_VALUE_num(sk), sizeof(*derlst), der_cmp);
	/* Output sorted DER encoding */	
	p = *out;
	for (i = 0, tder = derlst; i < sk_ASN1_VALUE_num(sk); i++, tder++)
		{
		memcpy(p, tder->data, tder->length);
		p += tder->length;
		}
	*out = p;
	/* If do_sort is 2 then reorder the STACK */
	if (do_sort == 2)
		{
		for (i = 0, tder = derlst; i < sk_ASN1_VALUE_num(sk);
							i++, tder++)
			(void)sk_ASN1_VALUE_set(sk, i, tder->field);
		}
	OPENSSL_free(derlst);
	OPENSSL_free(tmpdat);
	return 1;
	}

static int asn1_i2d_ex_primitive(ASN1_VALUE **pval, unsigned char **out,
				const ASN1_ITEM *it, int tag, int aclass)
	{
	int len;
	int utype;
	int usetag;
	int ndef = 0;

	utype = it->utype;

	/* Get length of content octets and maybe find
	 * out the underlying type.
	 */

	len = asn1_ex_i2c(pval, NULL, &utype, it);

	/* If SEQUENCE, SET or OTHER then header is
	 * included in pseudo content octets so don't
	 * include tag+length. We need to check here
	 * because the call to asn1_ex_i2c() could change
	 * utype.
	 */
	if ((utype == V_ASN1_SEQUENCE) || (utype == V_ASN1_SET) ||
	   (utype == V_ASN1_OTHER))
		usetag = 0;
	else usetag = 1;

	/* -1 means omit type */

	if (len == -1)
		return 0;

	/* -2 return is special meaning use ndef */
	if (len == -2)
		{
		ndef = 2;
		len = 0;
		}

	/* If not implicitly tagged get tag from underlying type */
	if (tag == -1) tag = utype;

	/* Output tag+length followed by content octets */
	if (out)
		{
		if (usetag)
			ASN1_put_object(out, ndef, len, tag, aclass);
		asn1_ex_i2c(pval, *out, &utype, it);
		if (ndef)
			ASN1_put_eoc(out);
		else
			*out += len;
		}

	if (usetag)
		return ASN1_object_size(ndef, len, tag);
	return len;
	}

/* Produce content octets from a structure */

int asn1_ex_i2c(ASN1_VALUE **pval, unsigned char *cout, int *putype,
				const ASN1_ITEM *it)
	{
	ASN1_BOOLEAN *tbool = NULL;
	ASN1_STRING *strtmp;
	ASN1_OBJECT *otmp;
	int utype;
	unsigned char *cont, c;
	int len;
	const ASN1_PRIMITIVE_FUNCS *pf;
	pf = it->funcs;
	if (pf && pf->prim_i2c)
		return pf->prim_i2c(pval, cout, putype, it);

	/* Should type be omitted? */
	if ((it->itype != ASN1_ITYPE_PRIMITIVE)
		|| (it->utype != V_ASN1_BOOLEAN))
		{
		if (!*pval) return -1;
		}

	if (it->itype == ASN1_ITYPE_MSTRING)
		{
		/* If MSTRING type set the underlying type */
		strtmp = (ASN1_STRING *)*pval;
		utype = strtmp->type;
		*putype = utype;
		}
	else if (it->utype == V_ASN1_ANY)
		{
		/* If ANY set type and pointer to value */
		ASN1_TYPE *typ;
		typ = (ASN1_TYPE *)*pval;
		utype = typ->type;
		*putype = utype;
		pval = &typ->value.asn1_value;
		}
	else utype = *putype;

	switch(utype)
		{
		case V_ASN1_OBJECT:
		otmp = (ASN1_OBJECT *)*pval;
		cont = otmp->data;
		len = otmp->length;
		break;

		case V_ASN1_NULL:
		cont = NULL;
		len = 0;
		break;

		case V_ASN1_BOOLEAN:
		tbool = (ASN1_BOOLEAN *)pval;
		if (*tbool == -1)
			return -1;
		if (it->utype != V_ASN1_ANY)
			{
			/* Default handling if value == size field then omit */
			if (*tbool && (it->size > 0))
				return -1;
			if (!*tbool && !it->size)
				return -1;
			}
		c = (unsigned char)*tbool;
		cont = &c;
		len = 1;
		break;

		case V_ASN1_BIT_STRING:
		return i2c_ASN1_BIT_STRING((ASN1_BIT_STRING *)*pval,
							cout ? &cout : NULL);
		break;

		case V_ASN1_INTEGER:
		case V_ASN1_NEG_INTEGER:
		case V_ASN1_ENUMERATED:
		case V_ASN1_NEG_ENUMERATED:
		/* These are all have the same content format
		 * as ASN1_INTEGER
		 */
		return i2c_ASN1_INTEGER((ASN1_INTEGER *)*pval,
							cout ? &cout : NULL);
		break;

		case V_ASN1_OCTET_STRING:
		case V_ASN1_NUMERICSTRING:
		case V_ASN1_PRINTABLESTRING:
		case V_ASN1_T61STRING:
		case V_ASN1_VIDEOTEXSTRING:
		case V_ASN1_IA5STRING:
		case V_ASN1_UTCTIME:
		case V_ASN1_GENERALIZEDTIME:
		case V_ASN1_GRAPHICSTRING:
		case V_ASN1_VISIBLESTRING:
		case V_ASN1_GENERALSTRING:
		case V_ASN1_UNIVERSALSTRING:
		case V_ASN1_BMPSTRING:
		case V_ASN1_UTF8STRING:
		case V_ASN1_SEQUENCE:
		case V_ASN1_SET:
		default:
		/* All based on ASN1_STRING and handled the same */
		strtmp = (ASN1_STRING *)*pval;
		/* Special handling for NDEF */
		if ((it->size == ASN1_TFLG_NDEF)
			&& (strtmp->flags & ASN1_STRING_FLAG_NDEF))
			{
			if (cout)
				{
				strtmp->data = cout;
				strtmp->length = 0;
				}
			/* Special return code */
			return -2;
			}
		cont = strtmp->data;
		len = strtmp->length;

		break;

		}
	if (cout && len)
		memcpy(cout, cont, len);
	return len;
	}