如何使用Swift 3生成RSA public和私钥？

Question

我使用 SecKeyGeneratePair 创建了 public 和私有的密钥对。

ViewController

import UIKit
import Security

class ViewController: UIViewController {

    @IBOutlet weak var textFld: UITextField!
    @IBOutlet weak var encryptedTextFld: UITextView!
    @IBOutlet weak var decryptedTextFld: UITextView!

    var statusCode: OSStatus?
    var publicKey: SecKey?
    var privateKey: SecKey?

    override func viewDidLoad() {
        super.viewDidLoad()

        let publicKeyAttr: [NSObject: NSObject] = [kSecAttrIsPermanent:true as NSObject, kSecAttrApplicationTag:"com.xeoscript.app.RsaFromScrach.public".data(using: String.Encoding.utf8)! as NSObject]
        let privateKeyAttr: [NSObject: NSObject] = [kSecAttrIsPermanent:true as NSObject, kSecAttrApplicationTag:"com.xeoscript.app.RsaFromScrach.private".data(using: String.Encoding.utf8)! as NSObject]

        var keyPairAttr = [NSObject: NSObject]()
        keyPairAttr[kSecAttrKeyType] = kSecAttrKeyTypeRSA
        keyPairAttr[kSecAttrKeySizeInBits] = 2048 as NSObject
        keyPairAttr[kSecPublicKeyAttrs] = publicKeyAttr as NSObject
        keyPairAttr[kSecPrivateKeyAttrs] = privateKeyAttr as NSObject

        statusCode = SecKeyGeneratePair(keyPairAttr as CFDictionary, &publicKey, &privateKey)

        if statusCode == noErr && publicKey != nil && privateKey != nil {
            print("Key pair generated OK")
            print("Public Key: \(publicKey!)")
            print("Private Key: \(privateKey!)")
        } else {
            print("Error generating key pair: \(String(describing: statusCode))")
        }

    }

    @IBAction func encryptPressed(_ sender: Any) {

    }

    @IBAction func decryptPressed(_ sender: Any) {

    }

然后我得到了如下的钥匙

Public 键

<SecKeyRef algorithm id: 1, key type: RSAPublicKey, version: 4, block size: 2048 bits, exponent: {hex: 10001, decimal: 65537}, modulus: B4854E2DA6BA5EBC96C38BD44078D314E4504D130A03018ACD17D0F6679C3B6C9937B5D932A635AEAC32B9245EC400208C1F79932174EF804468D0DCE40DAF5B544CF9E4BCD7C49BA5D0BF3F8246B89B57A3A910CBB5200DCA6145E3EE216CE9C4A3283F1027AA15F7543BD3BEFF35BE24EE709CF8EB12545970AFFDA38CA11410ECA20A8F428D228ED07BF5399A2F55D93D7C143BAFA59A08E4FF932C3A689FA7F3F166B79A43837028319CB383F716B594F317ED6E20D7A8003190A13BC132D5B13708EDAEA3E2012B16CF37437BB617070D9A6DDFE55884A79BD530E4E654B823A8BBBF0AA777C8E46E94BD83E1C59EC6E1D34E69405640C309515243AA8D, addr: 0x608000420e80>

私钥

<SecKeyRef algorithm id: 1, key type: RSAPrivateKey, version: 4, block size: 2048 bits, addr: 0x60000003b960>

但是我不想像上面那样生成。

我除了下面的键

Public 键

私钥

如何将SecKeyGeneratePair生成的密钥转换为-----BEGIN RSA PUBLIC KEY----- ................ -----END RSA PUBLIC KEY----- 格式

Answer 1

首先你需要获得代表你的密钥对的原始比特流（数据）

您需要的只是代表获得的数据的 base64 编码字符串，以及您示例中通常称为 PEM 格式的页眉和页脚

怎么样？检查 data.base64EncodedString()

警告！！！导出私钥是...对不起的话...愚蠢的想法

Answer 2

请试试这个：

let publicKeyAttr: [NSObject: NSObject] = [
            kSecAttrIsPermanent:true as NSObject,
            kSecAttrApplicationTag:"com.xeoscript.app.RsaFromScrach.public".data(using: String.Encoding.utf8)! as NSObject,
            kSecClass: kSecClassKey, // added this value
            kSecReturnData: kCFBooleanTrue] // added this value
let privateKeyAttr: [NSObject: NSObject] = [
            kSecAttrIsPermanent:true as NSObject,
            kSecAttrApplicationTag:"com.xeoscript.app.RsaFromScrach.private".data(using: String.Encoding.utf8)! as NSObject,
            kSecClass: kSecClassKey, // added this value
            kSecReturnData: kCFBooleanTrue] // added this value

var keyPairAttr = [NSObject: NSObject]()
keyPairAttr[kSecAttrKeyType] = kSecAttrKeyTypeRSA
keyPairAttr[kSecAttrKeySizeInBits] = 2048 as NSObject
keyPairAttr[kSecPublicKeyAttrs] = publicKeyAttr as NSObject
keyPairAttr[kSecPrivateKeyAttrs] = privateKeyAttr as NSObject

var publicKey : SecKey?
var privateKey : SecKey?;

let statusCode = SecKeyGeneratePair(keyPairAttr as CFDictionary, &publicKey, &privateKey)

if statusCode == noErr && publicKey != nil && privateKey != nil {
    print("Key pair generated OK")
    var resultPublicKey: AnyObject?
    var resultPrivateKey: AnyObject?
    let statusPublicKey = SecItemCopyMatching(publicKeyAttr as CFDictionary, &resultPublicKey)
    let statusPrivateKey = SecItemCopyMatching(privateKeyAttr as CFDictionary, &resultPrivateKey)

    if statusPublicKey == noErr {
        if let publicKey = resultPublicKey as? Data {
            print("Public Key: \((publicKey.base64EncodedString()))")
        }
    }

    if statusPrivateKey == noErr {
        if let privateKey = resultPrivateKey as? Data {
            print("Private Key: \((privateKey.base64EncodedString()))")
        }
    }
} else {
    print("Error generating key pair: \(String(describing: statusCode))")
}

Answer 3

您需要使用 SecKeyCopyExternalRepresentation 方法将 public/private 密钥对转换为外部表示，然后使用 base64EncodedString(options: ) 方法将您的数据转换为 base64 编码字符串，这只是 PEM 格式。 Refer the code here

如何使用Swift 3生成RSA public和私钥？

How to generate RSA public and private keys using Swift 3?

rsa

public-key

ios

swift

swift3

ViewController

Public 键

私钥

Public 键

私钥