1

Is it possible to detect S/MIME content types (enveloped or signed) using OpenSSL CMS API? I would prefer to avoid pre-parsing S/MIME headers and let OpenSSL to detect whether message is signed or encrypted.

I'm looking for a method that would extract smime-type from CMS_ContentInfo.

1

After formulating a question, I've noticed solution myself. In case this might be useful for someone else:

CMS_get0_type - converts CMS_ContentInfo into ASN1_object pointer

OBJ_obj2nid - gets one of the following NID values from ASN1_object pointer:

NID_pkcs7_data

NID_pkcs7_signed

NID_pkcs7_digest

NID_id_smime_ct_compressedData:

NID_pkcs7_encrypted

NID_pkcs7_enveloped

For details see: http://wiki.openssl.org/index.php/Manual:CMS_get0_type(3)

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.