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我使用 Xcode11 Beta 作为 IDE 和 Swift。

下面是我的代码，我的代码在Xcode10.3上可以正常运行，但是在Xcode11上不行。当我调用函数 SecKeyCopyKeyExchangeResult() 时，堆栈总是返回错误，“kSecKeyKeyExchangeParameterRequestedSize is missing”，但在 Xcode10.3 上没问题。我查看了 Apple Developer 门户网站，对此一无所知。

`
func main() {

    testECDH()
}

private func testECDH(){
    generateKeyPair()
    let alicePublicKey = getPublicKey()
    let alicePrivateKey = getPrivateKey()
    print(alicePublicKey)
    print(alicePrivateKey)

    generateKeyPair()
    let bobPublicKey = getPublicKey()
    let bobPrivateKey = getPrivateKey()
    print(bobPublicKey)
    print(bobPrivateKey)

    let alice_bob_ecdhsecret = ecdhSecretCalculation(publicKey: alicePublicKey, privateKey: bobPrivateKey)!
    let bob_alice_ecdhsecret = ecdhSecretCalculation(publicKey: bobPublicKey, privateKey: alicePrivateKey)!

    os_log("alice_bob_ecdhsecret = %@", alice_bob_ecdhsecret)
    os_log("bob_alice_ecdhsecret = %@", bob_alice_ecdhsecret)
}

private func generateKeyPair(){
    let attributes: [String: Any] = [kSecAttrKeySizeInBits as String: 256,
                                     kSecAttrKeyType as String: kSecAttrKeyTypeECSECPrimeRandom,
                                     kSecPrivateKeyAttrs as String: [kSecAttrIsPermanent as String: false],
                                     kSecPublicKeyAttrs as String:[kSecAttrIsPermanent as String: false]]

    var error: Unmanaged<CFError>?

    privateKey = SecKeyCreateRandomKey(attributes as CFDictionary, &error)!

    if privateKey != nil {
        publicKey = SecKeyCopyPublicKey(privateKey!)
    }


}

private func getPrivateKey()->SecKey{
    return privateKey!
}

private func getPublicKey()->SecKey{
    return publicKey!
}

private func ecdhSecretCalculation(publicKey: SecKey, privateKey: SecKey) -> NSData?
{
    var error: Unmanaged<CFError>?

    let keyPairAttr:[String : Any] = [kSecAttrKeySizeInBits as String: 256,
                                      kSecAttrKeyType as String: kSecAttrKeyTypeECSECPrimeRandom,
                                      kSecPrivateKeyAttrs as String: [kSecAttrIsPermanent as String: false],
                                      kSecPublicKeyAttrs as String:[kSecAttrIsPermanent as String: false]]
    let algorithm:SecKeyAlgorithm = SecKeyAlgorithm.ecdhKeyExchangeStandardX963SHA256//ecdhKeyExchangeStandardX963SHA256

    let shared:CFData? = SecKeyCopyKeyExchangeResult(privateKey, algorithm, publicKey, keyPairAttr as! CFDictionary, &error)

    return shared
}`
4

1 回答 1

4

我只是通过下面的代码片段解决了这个问题

let keyPairAttr:[String : Any] = [kSecAttrKeySizeInBits as String: 256,

                                      SecKeyKeyExchangeParameter.requestedSize.rawValue as String: 32,
                                      kSecAttrKeyType as String: kSecAttrKeyTypeECSECPrimeRandom,
                                      kSecPrivateKeyAttrs as String: [kSecAttrIsPermanent as String: false],
                                      kSecPublicKeyAttrs as String:[kSecAttrIsPermanent as String: false]]
    let algorithm:SecKeyAlgorithm = SecKeyAlgorithm.ecdhKeyExchangeStandardX963SHA256//ecdhKeyExchangeStandardX963SHA256

    let shared:CFData? = SecKeyCopyKeyExchangeResult(privateKey, algorithm, publicKey, keyPairAttr as! CFDictionary, &error)

请注意，以下是我为解决此问题而添加的代码：

SecKeyKeyExchangeParameter.requestedSize.rawValue as String: 32,
于 2019-09-20T10:34:25.677 回答