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Diffstat (limited to 'src/crypto/obj/README')
| -rw-r--r-- | src/crypto/obj/README | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/src/crypto/obj/README b/src/crypto/obj/README new file mode 100644 index 0000000..8826e59 --- /dev/null +++ b/src/crypto/obj/README @@ -0,0 +1,37 @@ +OID information is generated via a series of perl scripts. In order, the full +list of commands to run are: + + perl objects.pl objects.txt obj_mac.num ../../include/openssl/obj_mac.h + perl obj_dat.pl ../../include/openssl/obj_mac.h obj_dat.h + perl obj_xref.pl obj_mac.num obj_xref.txt > obj_xref.h + +objects.txt contains the list of all built-in OIDs. It is processed by +objects.pl to output obj_mac.num and obj_mac.h. obj_mac.num is the list of NID +values for each OID. This is an input/output parameter so NID values are stable +across regenerations. obj_mac.h is the header which defines macros for all the +built-in OIDs in C. + +obj_mac.h is read by obj_dat.pl to generate obj_dat.h. obj_dat.h contains the +ASN1_OBJECTs corresponding to built-in OIDs themselves along with lookup tables +for search by short name, OID, etc. + +obj_mac.num and obj_xref.txt are read by obj_xref.pl to generate +obj_xref.h. obj_xref.txt links signature OIDs to corresponding public key +algorithms and digests. obj_xref.h contains lookup tables for querying this +information in both directions. + +Dependency graph: + + objects.txt + | + V + [objects.pl] <--+ + / \ | + V V | + obj_mac.h obj_mac.num obj_xref.txt + | \ / + V V V + [obj_dat.pl] [obj_xref.pl] + | | + V V + obj_dat.h obj_xref.h |