I can provide you with an article about the implementation of BLSC (blind signatures with the nist curve) for checking using the PRECOMPILES contract by Alt_bn128.
Implementation of the BLS check with the pre -compiling contract of Alt_Bn128
Blind signatures (BSS) are a kind of cryptographic primitive that enable safe and anonymous communication. In this article we will examine how the BS check with the Precompile Treaty of Alt_Bn128 is implemented on Ethereum.
What is BLSC?
Let us quickly check what BLSC is before immersing you in the implementation. BSS is based on the Nist curve (BNP), which consists of three components:
- Signing : The signatories uses the private key to calculate a signature.
- Check : The checker uses the public key and the signed message to check the authenticity and integrity of the data.
- Encryption
: The encrypted data is protected by a common secret.
Alt_bn128 Contract overview
The Preompile Treaty of Alt_BN128 is an implementation of the BNP (NIST curve) using the Nist-curve 256-bit security parameter. It offers a number of functions for signing, checks and encryption of messages.
Here is a high -ranking overview of the contract:
Sign (): Signing function that calculates a signature from a private key.
Verify (): Check function that checks a signed message with a public key.
Encrypt ()(not implemented): encryption function that protects an encrypted message with a shared secret.
Decompress ()(not implemented): decrypt the function that detered an encrypted message.
Implementation of the BLS check with the pre -compiling contract of Alt_Bn128
In order to implement the BLSC check, we have to offer the checker a way to communicate with the signatory and to calculate the signature. Here is a sample implementation:
`Solidity
Pragma solidity ^0.8.0;
Contract blsverifier {
// pre -compiling contract functions
Check function (
Uint256 [2] Salvation signature,
Uint256 [4] Memory Pubkey,
Uint256 [2] Sacred news) Public view return (Bool, bytes memory) {
// Calculate the signature with the public key and the signed message
Address simleraddress = too payable (msg.sender);
Bytes32 Messagehash = Keccak256 (Abi.encodepacked (message));
Bytes32 Signaturehash = Keccak256 (Abi.encodepacked (signature)));
uint256 signature geng = 64;
Bytes memory signature = Abi.encodepacked (Messagehash, Signaturehash, Uint160 (signatural));
// Sign the signed message with the private key
Bytes32 Signaturehash2 = Keccak256 (Abi.encodepacked (Signeraddress, Signature));
Bytes memory sig = abi.encodepacked (signaturehash, signaturehash2);
// Check the signature using the public key and the signed message
Address Verifierdress = to pay (MSG.SDEN);
bytes32 verifiermessagehash = keccak256 (Abi.encodepacked (message));
Bytes32 verifiersighash = keccak256 (Abi.encodepacked (verifiermessagehash, sig));
uint256 verifiseriglength = 64;
Bytes memory verifiserig = abi.endendpacked (verifiermessagehash, verifiersssigh, uint160 (verifinsiglength)));
// return the verification result
return (verifying (verifying), abi.encodepacked (verifier));
}
}
`
In this example -implementation:
- We first calculate the signature with the public key and the signed message.
- We then sign the signed message with the private key of the signatory address.
3 .. We again verify the signature using the public button and the signed message again with the help of the verification address.
- The “Verify” function returns a Boolean value that indicates whether the verification was successful (i.e. right) or wrong (i.e. wrong).