Chilkat Examples

ChilkatHOME.NET Core C#Android™AutoItCC#C++Chilkat2-PythonCkPythonClassic ASPDataFlexDelphi ActiveXDelphi DLLGoJavaLianjaMono C#Node.jsObjective-CPHP ActiveXPHP ExtensionPerlPowerBuilderPowerShellPureBasicRubySQL ServerSwift 2Swift 3,4,5...TclUnicode CUnicode C++VB.NETVBScriptVisual Basic 6.0Visual FoxProXojo Plugin

Swift 2 Examples

Web API Categories

ASN.1
AWS KMS
AWS Misc
Amazon EC2
Amazon Glacier
Amazon S3
Amazon S3 (new)
Amazon SES
Amazon SNS
Amazon SQS
Async
Azure Cloud Storage
Azure Key Vault
Azure Service Bus
Azure Table Service
Base64
Bounced Email
Box
CAdES
CSR
CSV
Certificates
Cloud Signature CSC
Code Signing
Compression
DKIM / DomainKey
DNS
DSA
Diffie-Hellman
Digital Signatures
Dropbox
Dynamics CRM
EBICS
ECC
Ed25519
Email Object
Encryption
FTP
FileAccess
Firebase
GMail REST API
GMail SMTP/IMAP/POP
Geolocation
Google APIs
Google Calendar
Google Cloud SQL
Google Cloud Storage
Google Drive
Google Photos
Google Sheets
Google Tasks
Gzip
HTML-to-XML/Text
HTTP

HTTP Misc
IMAP
JSON
JSON Web Encryption (JWE)
JSON Web Signatures (JWS)
JSON Web Token (JWT)
Java KeyStore (JKS)
MHT / HTML Email
MIME
MS Storage Providers
Microsoft Graph
Misc
NTLM
OAuth1
OAuth2
OIDC
Office365
OneDrive
OpenSSL
Outlook
Outlook Calendar
Outlook Contact
PDF Signatures
PEM
PFX/P12
PKCS11
POP3
PRNG
REST
REST Misc
RSA
SCP
SCard
SFTP
SMTP
SSH
SSH Key
SSH Tunnel
ScMinidriver
SharePoint
SharePoint Online
Signing in the Cloud
Socket/SSL/TLS
Spider
Stream
Tar Archive
ULID/UUID
Upload
WebSocket
XAdES
XML
XML Digital Signatures
XMP
Zip
curl
uncategorized

 

 

 

(Swift 2) Streaming Encryption

Encrypt and decrypt using a stream.

Chilkat Downloads for the Swift Programming Language

MAC OS X (Cocoa) Objective-C/Swift Libs

iOS Objective-C/Swift Libs

func chilkatTest() {
    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    let crypt = CkoCrypt2()

    // Setup encryption using the chacha20 algorithm...
    crypt.CryptAlgorithm = "chacha20"
    crypt.KeyLength = 256
    crypt.EncodingMode = "hex"
    var ivHex: String? = "000000000000000000000002"
    crypt.SetEncodedIV(ivHex, encoding: "hex")
    crypt.InitialCount = 42
    var keyHex: String? = "1c9240a5eb55d38af333888604f6b5f0473917c1402b80099dca5cbc207075c0"
    crypt.SetEncodedKey(keyHex, encoding: "hex")

    var plainText: String? = "The quick brown fox jumped over the lazy dog.\r\n"

    let stream = CkoStream()

    // We'll save the encrypted output in eStrings to demonstrate streaming decryption next.
    let eStrings = CkoStringArray()

    // Start a background task that will encrypt a stream.
    var task: CkoTask? = crypt.EncryptStreamAsync(stream)
    var success: Bool = task!.Run()

    // Write plainText to the stream, and read chacha20 encrypted text..
    var cipherText: String?
    var i: Int
    for i = 1; i <= 10; i++ {
        // Note: An encryption algorithm's block size will cause buffering,
        // and therefore not every loop iteration will produce output.
        success = stream.WriteString(plainText)
        if stream.DataAvailable == true {
            cipherText = stream.ReadBytesENC("hex")
            print("\(cipherText!)")
            success = eStrings.Append(cipherText)
        }

    }

    // Tell the background task that the stream has ended.
    success = stream.WriteClose()

    // Let's make sure the background task finished.
    // It should already be the case that the task is finished.
    while (task!.Finished != true) {
        task!.SleepMs(20)
    }

    // Get any remaining data available from the stream.
    if stream.DataAvailable == true {
        cipherText = stream.ReadBytesENC("hex")
        print("\(cipherText!)")
        success = eStrings.Append(cipherText)
    }

    if task!.TaskSuccess != true {
        print("async encryption failed:")
        print("\(task!.ResultErrorText)")
        success = false
    }

    task = nil

    print("-- encrypt finished --")

    // Now decrypt to return the original.

    // Reset the stream object so it can be used again.
    stream.Reset()

    // Start a background task that will decrypt a stream.
    task = crypt.DecryptStreamAsync(stream)
    success = task!.Run()

    var n: Int = eStrings.Count.intValue
    for i = 0; i <= n - 1; i++ {
        success = stream.WriteBytesENC(eStrings.GetString(i), encoding: "hex")
        if stream.DataAvailable == true {
            plainText = stream.ReadString()
            print("\(plainText!)")
        }

    }

    // Tell the background task that the stream has ended.
    success = stream.WriteClose()

    // Let's make sure the background task finished.
    // It should already be the case that the task is finished.
    while (task!.Finished != true) {
        task!.SleepMs(20)
    }

    // Get any remaining data available from the stream.
    if stream.DataAvailable == true {
        plainText = stream.ReadString()
        print("\(plainText!)")
    }

    if task!.TaskSuccess != true {
        print("async decryption failed:")
        print("\(task!.ResultErrorText)")
        success = false
    }

    task = nil

    print("-- decrypt finished --")

}

 

© 2000-2024 Chilkat Software, Inc. All Rights Reserved.