Question: Is it safe to use same private key in two or more algorithms?

[yangby-cryptape]

What happened

Is it safe to use same private key in two or more algorithms?

I'm not sure, but I know to solve a system of equations that has two equations is definitely easier than solving one equation.

• BLST

  axon/core/run/src/lib.rs

  Lines 532 to 534 in fd220ad

  	fn get_my_hex_privkey(&self) -> Vec<u8> {
  	hex_decode(&self.config.privkey.as_string_trim0x()).unwrap()
  	}

  
  

  axon/core/run/src/lib.rs

  Lines 538 to 540 in fd220ad

  	let hex_privkey = self.get_my_hex_privkey();
  	let bls_priv_key = BlsPrivateKey::try_from(hex_privkey.as_ref())
  	.map_err(MainError::Crypto)

  Ref: BLST

• Secp256k1 (Two different Version)

  axon/core/network/src/config.rs

  Line 117 in fd220ad

  .secio_keypair(&config.privkey.as_string_trim0x())

  
  

  axon/core/run/src/lib.rs

  Lines 608 to 612 in fd220ad

  	let hex_privkey = self.get_my_hex_privkey();
  	let node_info = NodeInfo {
  	chain_id: self.genesis.block.header.chain_id,
  	self_address: self.get_my_address(hex_privkey.clone()),
  	self_pub_key: self.get_my_pubkey(hex_privkey).to_bytes(),

  
  

  axon/core/run/src/lib.rs

  Lines 518 to 521 in fd220ad

  	fn get_my_pubkey(&self, hex_privkey: Vec<u8>) -> Secp256k1PublicKey {
  	let my_privkey = Secp256k1PrivateKey::try_from(hex_privkey.as_ref())
  	.map_err(MainError::Crypto)
  	.unwrap();

  
  

  axon/Cargo.lock

  Lines 5909 to 5910 in fd220ad

  	name = "secp256k1"
  	version = "0.22.2"

  
  

  axon/Cargo.lock

  Lines 5918 to 5919 in fd220ad

  	name = "secp256k1"
  	version = "0.24.3"

  Ref:

  • tentacle-secio/secp256k1 (Same as CKB used)
  • ophelia-secp256k1/secp256k1

[yangby-cryptape]

Not all valid secp256k1 private keys are valid bls private keys.