Generate code for SM2 (#1940)

* Generate code for SM2

* fix sm2scalar.go name suffix

* ci: zig with fixed version

* fiat-zig: add sm2/sm2scalar test

Author: emmansun

Makefile.examples

@@ -123,11 +123,13 @@ $(foreach bw,64 32,$(eval $(call add_curve_keys,secp256k1_montgomery_$(bw),WORD_
 $(foreach bw,64 32,$(eval $(call add_curve_keys,p384_$(bw),WORD_BY_WORD_MONTGOMERY,'p384',$(bw),'2^384 - 2^128 - 2^96 + 2^32 - 1',$(WORD_BY_WORD_MONTGOMERY_FUNCTIONS),WORD_BY_WORD_MONTGOMERY)))
 $(foreach bw,64 32,$(eval $(call add_curve_keys,p224_$(bw),WORD_BY_WORD_MONTGOMERY,'p224',$(bw),'2^224 - 2^96 + 1',$(WORD_BY_WORD_MONTGOMERY_FUNCTIONS),WORD_BY_WORD_MONTGOMERY)))
 $(foreach bw,64,$(eval $(call add_curve_keys,p434_$(bw),WORD_BY_WORD_MONTGOMERY,'p434',$(bw),'2^216 * 3^137 - 1',$(WORD_BY_WORD_MONTGOMERY_FUNCTIONS),WORD_BY_WORD_MONTGOMERY))) # 32 is a bit too heavy
+$(foreach bw,64 32,$(eval $(call add_curve_keys,sm2_$(bw),WORD_BY_WORD_MONTGOMERY,'sm2',$(bw),'2^256 - 2^224 - 2^96 + 2^64 - 1',$(WORD_BY_WORD_MONTGOMERY_FUNCTIONS),WORD_BY_WORD_MONTGOMERY)))
 
 $(foreach bw,64 32,$(eval $(call add_curve_keys,curve25519_scalar_$(bw),WORD_BY_WORD_MONTGOMERY,'25519_scalar',$(bw),'2^252 + 27742317777372353535851937790883648493',$(WORD_BY_WORD_MONTGOMERY_FUNCTIONS),WORD_BY_WORD_MONTGOMERY)))
 $(foreach bw,64 32,$(eval $(call add_curve_keys,p256_scalar_$(bw),WORD_BY_WORD_MONTGOMERY,'p256_scalar',$(bw),'2^256 - 2^224 + 2^192 - 89188191075325690597107910205041859247',$(WORD_BY_WORD_MONTGOMERY_FUNCTIONS),WORD_BY_WORD_MONTGOMERY)))
 $(foreach bw,64 32,$(eval $(call add_curve_keys,p384_scalar_$(bw),WORD_BY_WORD_MONTGOMERY,'p384_scalar',$(bw),'2^384 - 1388124618062372383947042015309946732620727252194336364173',$(WORD_BY_WORD_MONTGOMERY_FUNCTIONS),WORD_BY_WORD_MONTGOMERY)))
 $(foreach bw,64 32,$(eval $(call add_curve_keys,secp256k1_montgomery_scalar_$(bw),WORD_BY_WORD_MONTGOMERY,'secp256k1_montgomery_scalar',$(bw),'2^256 - 432420386565659656852420866394968145599',$(WORD_BY_WORD_MONTGOMERY_FUNCTIONS),WORD_BY_WORD_MONTGOMERY)))
+$(foreach bw,64 32,$(eval $(call add_curve_keys,sm2_scalar_$(bw),WORD_BY_WORD_MONTGOMERY,'sm2_scalar',$(bw),'2^256 - 2^224 - 188730267045675049073202170516080344797',$(WORD_BY_WORD_MONTGOMERY_FUNCTIONS),WORD_BY_WORD_MONTGOMERY)))
 
 $(foreach bw,64,$(eval $(call add_curve_keys,secp256k1_dettman_$(bw),DETTMAN_MULTIPLICATION,'secp256k1_dettman',$(bw),5 48 2 '2^256 - 4294968273',$(DETTMAN_MULTIPLICATION_FUNCTIONS),DETTMAN_MULTIPLICATION)))
 $(foreach bw,32,$(eval $(call add_curve_keys,secp256k1_dettman_$(bw),DETTMAN_MULTIPLICATION,'secp256k1_dettman',$(bw),10 22 6 '2^256 - 4294968273',$(DETTMAN_MULTIPLICATION_FUNCTIONS),DETTMAN_MULTIPLICATION)))