[secp256r1] What hash is used to generate address?

fastfrank · January 9, 2023, 12:49pm

I know that for ed25519 and secp256k1 a sha3_256 is used to hash keys to produce address.

My question is what hash is used for secp256r1 keys?

joyqvq · January 9, 2023, 6:51pm

a SuiAddress is defined as the last sha3_256 of a 1-byte signature scheme flag and a public key. The flag is 0x00 for Ed25519, 0x01 for Secp256k1 and 0x02 for Secp256r1.

github.com

MystenLabs/sui/blob/65efcc17564cdcc3b7d97bb11f767c0ccd6cc770/crates/sui-types/src/base_types.rs#L213-#L224


      
                  hasher.update(&[T::SIGNATURE_SCHEME.flag()]);
                  hasher.update(pk);
                  let g_arr = hasher.finalize();
          
          
        let mut res = [0u8; SUI_ADDRESS_LENGTH];
                  res.copy_from_slice(&AsRef::<[u8]>::as_ref(&g_arr)[..SUI_ADDRESS_LENGTH]);
                  SuiAddress(res)
              }
          }
          
          
impl From<&PublicKey> for SuiAddress {
              fn from(pk: &PublicKey) -> Self {
                  let mut hasher = Sha3_256::default();
                  hasher.update(&[pk.flag()]);
                  hasher.update(pk);
                  let g_arr = hasher.finalize();
          
          
        let mut res = [0u8; SUI_ADDRESS_LENGTH];
                  res.copy_from_slice(&AsRef::<[u8]>::as_ref(&g_arr)[..SUI_ADDRESS_LENGTH]);
                  SuiAddress(res)
              }

fastfrank · January 9, 2023, 8:25pm

Ok, so it is the same for secp256r1 then. Great.

I’m implementing in python and wanted to check.

Thanks