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Hello,
thanks a lot. Works nice. Just it is interesting that I get X509_ATTRIBUTEs what should be a SEQUENCE but need to parse as SET.
And to free the memory:
X509_ATTRIBUTE *attr;
while ((attr = sk_X509_ATTRIBUTE_pop(attrs)) != NULL) {
X509_ATTRIBUTE_free(attr);
}
sk_X509_ATTRIBUTE_free(attrs);
Looks working.
Regards,
Libor
On 2017-11-15 15:31, Dave Coombs wrote:
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 < ossl@xxxxxx> 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
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