区块链身份认证系统代码
时间: 2024-06-09 22:06:28 浏览: 67
区块链身份认证系统的代码实现需要考虑多方面的因素,包括加密算法、智能合约、链上数据存储等。以下是一个简单的区块链身份认证系统的代码实现,仅供参考:
1. 加密算法部分
```python
import hashlib
def sha256(msg):
"""
SHA256加密算法
"""
m = hashlib.sha256()
m.update(msg.encode("utf-8"))
return m.hexdigest()
```
2. 智能合约部分
```solidity
pragma solidity ^0.5.0;
contract Identity {
mapping (address => bytes32) public identities;
function createIdentity(bytes32 identityHash) public {
require(identities[msg.sender] == 0x0, "Identity already exists");
identities[msg.sender] = identityHash;
}
function verifyIdentity(bytes32 identityHash) public view returns (bool) {
return identities[msg.sender] == identityHash;
}
}
```
3. 链上数据存储部分
```python
import web3
# 连接以太坊节点
w3 = web3.Web3(web3.HTTPProvider('http://localhost:8545'))
# 部署智能合约
contract_source_code = """
pragma solidity ^0.5.0;
contract Identity {
mapping (address => bytes32) public identities;
function createIdentity(bytes32 identityHash) public {
require(identities[msg.sender] == 0x0, "Identity already exists");
identities[msg.sender] = identityHash;
}
function verifyIdentity(bytes32 identityHash) public view returns (bool) {
return identities[msg.sender] == identityHash;
}
}
"""
contract_compiled = web3.eth.compile_source(contract_source_code)
contract_interface = contract_compiled['<stdin>:Identity']
contract = w3.eth.contract(abi=contract_interface['abi'], bytecode=contract_interface['bin'])
tx_hash = contract.deploy(transaction={'from': w3.eth.accounts[0]})
tx_receipt = w3.eth.waitForTransactionReceipt(tx_hash)
# 实例化智能合约
identity_contract = w3.eth.contract(address=tx_receipt.contractAddress, abi=contract_interface['abi'])
# 创建身份认证信息
identity_hash = sha256("my identity")
identity_contract.functions.createIdentity(identity_hash).transact({'from': w3.eth.accounts[0]})
# 验证身份认证信息
result = identity_contract.functions.verifyIdentity(identity_hash).call({'from': w3.eth.accounts[0]})
print(result)
```
以上代码仅提供了一个简单的区块链身份认证系统的实现,实际应用中还需要考虑更加复杂的场景,如身份信息的管理、隐私保护等。