Ethereum: Implementing BLS Verification using the precompile altbn_128 contract

I can provide an article on the implementation of BLSC (blind signatures using the Nist curve) verification using the Alt_BN128 preliminary contract.

Implementation of BLS verification using the Alt_BN128 precision agreement

Blind signatures (BSS) are a kind of primitive cryptographic that enable safe and anonymous communication. In this article, we will examine how to implement BS verification using the Alt_BN128 precomitive agreement on Ethereum.

What is BLSC?

Before immersing ourselves in implementation, let’s quickly review what BLSC is. BSS are based on the Nist (BNP) curve, which consists of three elements:

• signing : The signator uses a private key to calculate the signature.

• Verification : The verifier uses a public key and a signed message to verify the authenticity and data integrity.

• encryption : encrypted data is protected by a shared secret.

Discussion of the Alt_BN128 contract

The alt_bn128 pre-sea contract is the implementation of the BNP (Nist curve) using the 256-bit security parameter NIST curve. Provides a set of functions for signing, verification and encryption of messages.

Here is a high -level review of the contract:

• SIGN (): Signing a function that calculates a private key signature.

• Verify (): Verification function that verifies the signed message with a public key.

• Enkrypt () (not implemented): The encryption function that protects the encrypted message with the secret.

• `DECPRESS ()(not implemented): deciphering function that removes an encrypted message.

Implementation of BLS verification using the Alt_BN128 precision agreement

To implement BLSC verification, we must provide the verifier by communicating with the signator and calculate the signature. Here is an example of implementation:

`Solidity

Pragma solidity ^0.8.0;

Blsverifier contract {

// Precile contract functions

Verify function (

Uint256 [2] memory signature,

Uint256 [4] Memory Pubkey,

Uint256 [2] Remembrance message) Public view returns (BOOL, Bajtes memory) {

// Calculate the signature using a public key and signed message

Signoddress address = Paid (MSG.SENDER);

Bajtes32 Messagehash = keccak256 (abi.encodepacked (message));

Bajtes32 Signaturehash = keccak256 (abi.encodepacked (signature));

Uint256 signatulength = 64;

Bytes Signature = ABI.encodePacked (Messagehash, Signaturehash, Uint160 (Signatulength));

// sign a signed message using a private key

Bytes32 Signuturehash2 = Keccak256 (abi.encodepacked (signoddress, signature));

Bytes Mamet sig = abi.encodepacked (signaturehash, signaturehash2);

// Check the signature using a public key and signed message

Verifieraddress address = Paid (MSG.SENDER);

Bytes32 Verifiermessagehash = keccak256 (abi.encodepacked (message));

Bytes32 Verifiershash = keccak256 (abi.encodepacked (verifiermessagehash, sig));

Uint256 verifiersiglength = 64;

Bytes Mameter Verifiersig = ABI.encodePacked (Verifiermessagehash, Verifiersighash, Uint160 (Verifiersiglength));

// Recese the verification result

Return (Verify (Verifiersig), abi.encodepacked (Verifiersig));

}

}

In this example, implementation:

• First, we calculate the signature using a public key and a signed message.

• Then we sign a signed message using a private key key.

• We verify the signature using a public key and a signed message, again using the verifier’s address.

• The “Verify” function returns the logical value indicating whether the verification was successful (i.e. True) or false (i.e. false).