在iOS swift/Objective C中实现Diffie Hellman生成公钥和私钥的方法有哪些？(除了Chilkat)

import Security

// 定义生成密钥对函数
func generateDiffieHellmanKeys() throws -> (publicKey: SecKey, privateKey: SecKey) {
    // 定义密钥对参数
    let parameters: [String: Any] = [
        kSecAttrKeyType as String: kSecAttrKeyTypeDiffieHellman,
        kSecAttrKeySizeInBits as String: 2048
    ]
    
    // 生成密钥对
    var publicKey: SecKey?
    var privateKey: SecKey?
    let status = SecKeyGeneratePair(parameters as CFDictionary, &publicKey, &privateKey)
    
    // 检查生成结果
    guard status == errSecSuccess, let publicKey = publicKey, let privateKey = privateKey else {
        throw NSError(domain: NSOSStatusErrorDomain, code: Int(status), userInfo: nil)
    }
    
    return (publicKey, privateKey)
}

// 调用生成密钥对函数
do {
    let keys = try generateDiffieHellmanKeys()
    let publicKey = keys.publicKey
    let privateKey = keys.privateKey
    
    // 使用生成的公钥和私钥进行后续操作
    // ...
} catch {
    print("生成Diffie Hellman密钥对失败：\(error.localizedDescription)")
}

import CryptoSwift

// 生成Diffie Hellman密钥对
let keys = DH.generateKeyPair(groupSize: .bits2048)
let publicKey = keys.publicKey
let privateKey = keys.privateKey

// 使用生成的公钥和私钥进行后续操作
// ...