Hi all, I actually figured it out, if anybody is curious about the solution for parsing this CRYPTLIB signature envelope (in this case DSA) - write to me directly, I will be happy to share the solution. Cheers, Max On 8/29/15 6:56 PM, Massimiliano Pala wrote: > Hi all, > > I am trying to parse a sequence that has, after an integer, a > 'private' (xclass) item. I was wondering what is the right templates / > macros to be able to generate the ASN1 functions with the usual macro. > An example of the structure I have to parse (B64 - DER), is the > following: > > MGICAQOAFGZKq8/wIYS7Iueq6NuaC3ESPqUKMAkGBSsOAwIaBQAwCwYHKoZIzjgEAQUABC8wLQIVAJTJ6W2QjBIbVQdAtLbPO3y1wazHAhRsXivNO/Eg4GMEgcmEx8OgsIxGzQ== > > > [ you can paste it into http://www.lapo.it/asn1js/ to get useful info. ] > > The field that is giving me issues is the 2nd field in the sequence - > offest 5, length 20 (i.e., after SEQUENCE (2 bytes) + INTEGER (3 > bytes) and then the 20bytes field that I want to parse). The type is > 0x80 - context specific. By using the ASN1_get_object() function, I > get the correct size (20), the tag (0), and the xclass (128). Now, how > do I go in order to generate the useful ASN1 function with teh usual > macros ? Here's an example (besides the second field) for what I am > trying to do: > > ASN1_SEQUENCE(TYPE) = { > > ASN1_SIMPLE(TYPE, field1, ASN1_INTEGER), > > XXXXXXX(TYPE, field2, YYYYY), <<-- What shall > be used here ? What Macro ? > > ASN1_SEQUENCE_OF(TYPE, field3, ASN1_OBJECT), > > ASN1_SEQUENCE_OF(TYPE, field3, ASN1_OBJECT), > > ASN1_SIMPLE(TYPE, field3, ASN1_OCTET_STRING) <<-- This might > be wrong as well - just noticed it is a very > > } ASN1_SEQUENCE_END(TYPE) weird > encoding (octet-string that encapsulates a sequence of integers) > > > Is there a way to have the macros do the work (e.g., shall I use other > macros - template? - to define the field somehow) ? Or shall I just > write my own d2i_ and i2d_ functions ? > > Please let me know, > > Cheers, > Max > > _______________________________________________ > openssl-users mailing list > To unsubscribe: https://mta.openssl.org/mailman/listinfo/openssl-users
