iPhone：HTTPS 客户端证书身份验证

iPhone：HTTPS 客户端证书身份验证

swift
import Foundation
class CertificateValidator: NSObject, URLSessionDelegate {
    func urlSession(_ session: URLSession, didReceive challenge: URLAuthenticationChallenge, completionHandler: @escaping (URLSession.AuthChallengeDisposition, URLCredential?) -> Void) {
        guard let serverTrust = challenge.protectionSpace.serverTrust else {
            completionHandler(.cancelAuthenticationChallenge, nil)
            return
        }
        
        // 自定义证书验证逻辑
        if validateCertificate(trust: serverTrust) {
            let credential = URLCredential(trust: serverTrust)
            completionHandler(.useCredential, credential)
        } else {
            completionHandler(.cancelAuthenticationChallenge, nil)
        }
    }
    
    func validateCertificate(trust: SecTrust) -> Bool {
        // 自定义证书验证逻辑，例如检查证书的公钥是否与预期一致
        // 这里只作为示例，实际应用中需要根据具体情况进行验证
        let publicKey = SecTrustCopyPublicKey(trust)
        let expectedPublicKey = loadExpectedPublicKey()
        
        return publicKey == expectedPublicKey
    }
    
    func loadExpectedPublicKey() -> SecKey? {
        // 加载预期的公钥，通常从证书文件或其他安全存储中获取
        // 这里只作为示例，实际应用中需要根据具体情况进行加载
        
        // 从 DER 格式的证书文件中加载公钥
        let certificateURL = Bundle.main.url(forResource: "certificate", withExtension: "cer")
        let certificateData = try? Data(contentsOf: certificateURL!)
        let certificate = SecCertificateCreateWithData(nil, certificateData! as CFData)
        var trust: SecTrust?
        SecTrustCreateWithCertificates(certificate!, SecPolicyCreateBasicX509(), &trust)
        return SecTrustCopyPublicKey(trust!)
    }
}
// 创建 NSURLSession，并设置代理
let session = URLSession(configuration: URLSessionConfiguration.default, delegate: CertificateValidator(), delegateQueue: nil)
// 创建 NSURLRequest
let url = URL(string: "https://example.com")
let request = URLRequest(url: url!)
// 发起网络请求
let task = session.dataTask(with: request) { (data, response, error) in
    // 处理网络请求的结果
}
task.resume()