Hello, You can do something like the following.
First make a type corresponding to a stack of x509 attributes: typedef STACK_OF(X509_ATTRIBUTE) SEQ_X509_ATTRIBUTE; DECLARE_ASN1_FUNCTIONS(SEQ_X509_ATTRIBUTE); Then make an asn1 template that specifies how the stack should be encoded. (You can use ASN1_TFLG_SET_OF instead of ..SEQUENCE_OF here, depending on the DER you're trying to interpret, I don't know.) ASN1_ITEM_TEMPLATE(SEQ_X509_ATTRIBUTE) = ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SEQUENCE_OF, 0, x509attribute, X509_ATTRIBUTE) ASN1_ITEM_TEMPLATE_END(SEQ_X509_ATTRIBUTE) IMPLEMENT_ASN1_FUNCTIONS(SEQ_X509_ATTRIBUTE) Now your type has its own d2i and i2d functions, and you can use them: STACK_OF(X509_ATTRIBUTE) *attrs = d2i_SEQ_X509_ATTRIBUTE(NULL, &data, length); Cheers, -Dave > On Nov 15, 2017, at 07:26, Libor Chocholaty <o...@mts.cz> wrote: > > Hello, > > I would like to parse DER encoded x509 attributes and have no clue how to use > d2i_ASN1_SET_OF_X509_ATTRIBUTE. There are params that cannot find what to > pass like free_func. > > I am trying to uderstand by collecting pieces of known code, looking into > openssl sources but... > > PKCS7_SIGNER_INFO *p7si = PKCS7_SIGNER_INFO_new(); > d2i_ASN1_SET_OF_X509_ATTRIBUTE(&p7si->auth_attr, &der_data, der_data_length, > d2i_X509_ATTRIBUTE, free_func, V_ASN1_SET, V_ASN1_UNIVERSAL); > > Could somebody help how to do it or give a link to some useful documentation? > Search internet looks completely not useful in this topic... or do not know > how to ask... > > Regards, > Libor > > > -- > openssl-users mailing list > To unsubscribe: https://mta.openssl.org/mailman/listinfo/openssl-users
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