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这就是我生成公钥/私钥对的方式

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

let publicKeyAttribute: [NSObject : NSObject] = [kSecAttrIsPermanent: true as NSObject, kSecAttrApplicationTag: "publictag".data(using: String.Encoding.utf8)! as NSObject]

let privateKeyAtrribute: [NSObject: NSObject] = [kSecAttrIsPermanent: true as NSObject, kSecAttrApplicationTag: "privatetag".data(using: String.Encoding.utf8)! as NSObject]

var keyPairAttr = [NSObject: Any]()
keyPairAttr[kSecAttrType] = kSecAttrKeyTypeRSA
keyPairAttr[kSecAttrKeySizeInBits] = 2048
keyPairAttr[kSecReturnData] = true
keyPairAttr[kSecPublicKeyAttrs] = publicKeyAttribute
keyPairAttr[kSecPrivateKeyAttrs] = privateKeyAtrribute


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

这会生成如下所示的密钥对，

公钥：

Optional(<SecKeyRef algorithm id: 1, key type: RSAPublicKey, version: 4, block size: 2048 …