InformationSecurityWorkshop.swift

// 建立模擬的 Server public/private keys
let keyPair = try! SwiftyRSA.generate2048RSAKeyPairAdv()
let privateKey = keyPair.privateKey
let publicKey = keyPair.publicKey

inputPubkey.text = try! publicKey.base64String()
inputPrivkey.text = try! privateKey.base64String()


// 這裡簡化流程，正常情況下要拿對方公鑰加密，傳輸出去對方才能用私鑰解開
let defaultEncPublicKey = try! PublicKey(base64Encoded: inputPubkey.text!)
let clear = try! ClearMessage(string: orgiTextView.text!, using: .utf8)
let encrypted = try! clear.encrypted(with: defaultEncPublicKey, padding: .PKCS1)
let EncData = encrypted.base64String

crypTextView.text = EncData

// 模擬 Server 把資料解密出來 (這邊非原作者加的，是小編在驗證得時候自己加的 debug log)
func runDecrypt() {
    let privateKey = try! PrivateKey(base64Encoded: inputPrivkey.text!)
    let encrypted = try! EncryptedMessage(base64Encoded: EncData)
    let clear = try! encrypted.decrypted(with: privateKey, padding: .PKCS1)

    // Then you can use:
    let data = clear.data
    let base64String = clear.base64String
    let string = try! clear.string(encoding: .utf8)
    print("Decrypt RSA: \(string)")
}
runDecrypt()