Hello,
I would like to use openssl/asn1 with these types:
TA ::= CHOICE {
f1 SET OF TA,
f2 TA,
f3 INTEGER
}
TB ::= SEQUENCE {
f1 INTEGER,
f2 CHOICE {
f2_1 INTEGER,
f2_2 BOOLEAN
}
}
I have two problems but I don't have found any
responses on Internet.
1) The definition of TA is recursive: it refers itself.
If I write:
1 typedef struct _ta_st TA;
2
3 struct _ta_st {
4 int type;
5 union {
6 STACK_OF(TA) *f1;
7 TA *f2;
8 ASN1_INTEGER *f3;
9 } value;
10 };
11
12 ASN1_CHOICE(TA) = {
13 ASN1_SET_OF(TA, value.f1, TA),
14 ASN1_SIMPLE(TA, value.f2, TA),
15 ASN1_SIMPLE(TA, value.f3, ASN1_INTEGER)
16 } ASN1_CHOICE_END(TA)
the lines 13 and 14 do not pass the compilation.
The problem is that the field item of the structure
ASN1_TEMPLATE_st, on line 13, refers to
ASN1_ITEM_ref(TA) == TA_it. However, TA_it is
created only on line 16. With cpp:
const static ASN1_TEMPLATE TA_ch_tt[] = {
{ ((0x1 << 1)), (0), ((size_t) &((TA *)0)->value.f1), "value.f1",
(&(TA_it)) },
{ (0), (0), ((size_t) &((TA *)0)->value.f2), "value.f2", (&(TA_it)) },
{ (0), (0), ((size_t) &((TA *)0)->value.f3), "value.f3",
(&(ASN1_INTEGER_it)) }
} ; const ASN1_ITEM TA_it = { 0x2, ((size_t) &((TA *)0)->type) , TA_ch_tt,
sizeof(TA_ch_tt) / sizeof(ASN1_TEMPLATE), ((void *)0),
sizeof(TA), "TA" };
Maybe would I use ASN1_OBJECT instead ? For exemple:
13 ASN1_SET_OF(TA, value.f1, ASN1_OBJECT),
14 ASN1_SIMPLE(TA, value.f2, ASN1_OBJECT),
But, I am not sure that it is a good solution.
Could you help me to resolve this problem ?
2) For the definition of TB, I think that there are two
solutions:
2_1) Creating two structure: TB_CHOICE and TB. TB_CHOICE is
declared in the same way as TA. Then, TB just refers to ASN1_INTEGER
and TB_CHOICE.
2_2) Creating only one structure containing an ASN1_INTEGER and
an union. Then using ASN1_ADB to inform the structure ASN1_TEMPLATE.
I think the two solutions are corrects.
Could you tell me, please, which one is the best ?
Thanks.
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