Armv8.4-A will add extended support for more cryptographic primitives, to include SM3, which is a cryptographic hash function used in the Chinese National Standard; and SM4, a 128-bit block cipher; along with SHA2-512 and SHA3. 1
I am just curious as to why Armv8.4-A added support for SM3 and SM4? It's odd, especially since SHA3 is slightly more secure than SM3 (in collision attacks, but SM3 is more secure in distinguishing attacks). 2 The SM3 cryptographic hash function and AES offer better security than SM4. 3
Question: Is there any advantage in using SM3 or SM4 over NIST-approved algorithms?