Add NID constants for Brainpool curves

Brainpool curves are used by European government organizations that are
suspicious of the NIST curves. Brainpool curves are very similar to NIST
curves with one critical difference: the parameters to Brainpool are
nothing-up-my-sleeve numbers [0].

The actual values of the NID constants have been taken from the OpenSSL
source code [1].

[0]: https://github.com/veorq/numsgen#seeds

[1]: https://github.com/openssl/openssl/blob/4e6647506331fc3b3ef5b23e5dbe188279ddd575/include/openssl/obj_mac.h#L4759

openssl-sys/src/obj_mac.rs

@@ -94,6 +94,9 @@ pub const NID_sect409k1: c_int = 731;
 pub const NID_sect409r1: c_int = 732;
 pub const NID_sect571k1: c_int = 733;
 pub const NID_sect571r1: c_int = 734;
+pub const NID_brainpoolP256r1: c_int = 927;
+pub const NID_brainpoolP384r1: c_int = 931;
+pub const NID_brainpoolP512r1: c_int = 933;
 pub const NID_wap_wsg_idm_ecid_wtls1: c_int = 735;
 pub const NID_wap_wsg_idm_ecid_wtls3: c_int = 736;
 pub const NID_wap_wsg_idm_ecid_wtls4: c_int = 737;

openssl/src/nid.rs

@@ -215,6 +215,9 @@ impl Nid {
     pub const SECT409R1: Nid = Nid(ffi::NID_sect409r1);
     pub const SECT571K1: Nid = Nid(ffi::NID_sect571k1);
     pub const SECT571R1: Nid = Nid(ffi::NID_sect571r1);
+    pub const BRAINPOOL_P256R1: Nid = Nid(ffi::NID_brainpoolP256r1);
+    pub const BRAINPOOL_P384R1: Nid = Nid(ffi::NID_brainpoolP384r1);
+    pub const BRAINPOOL_P512R1: Nid = Nid(ffi::NID_brainpoolP512r1);
     pub const WAP_WSG_IDM_ECID_WTLS1: Nid = Nid(ffi::NID_wap_wsg_idm_ecid_wtls1);
     pub const WAP_WSG_IDM_ECID_WTLS3: Nid = Nid(ffi::NID_wap_wsg_idm_ecid_wtls3);
     pub const WAP_WSG_IDM_ECID_WTLS4: Nid = Nid(ffi::NID_wap_wsg_idm_ecid_wtls4);