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Virgil Crypto Library Objective-C/Swift

Platform

Introduction

Virgil Crypto Library Objective-C/Swift is a small, flexible and convenient wrapper for a variety of crypto algorithms. It can be used in a small microcontroller as well as in a high load server application. Also, it provides a bunch of custom hybrid algorithms that combine different crypto algorithms to solve common complex cryptographic problems in an easy way. That eliminates a requirement for developers to have strong cryptographic skills.

Virgil Security Objective-C/Swift Crypto Library uses Swift wrapper Virgil Security Crypto Library Wrapper over C library Virgil Security Crypto Library.

Library purposes

Asymmetric Key Generation
Encryption/Decryption of data and streams
Generation/Verification of digital signatures
Double Ratchet algorithm support
Post-quantum algorithms support: Round5 (encryption) and Falcon (signature)
Crypto for using Virgil Core SDK

Installation

VirgilCrypto is provided as a set of frameworks. These frameworks are distributed via Carthage and CocoaPods.

All frameworks are available for:

iOS 11.0+
macOS 10.13+
tvOS 11.0+
watchOS 4.0+

COCOAPODS

CocoaPods is a dependency manager for Cocoa projects. You can install it with the following command:

$ gem install cocoapods

To integrate VirgilCrypto into your Xcode project using CocoaPods, specify it in your Podfile:

target '<Your Target Name>' do
  use_frameworks!

  pod 'VirgilCrypto', '~> 7.0.1'
end

Then, run the following command:

$ pod install

Swift Package Manager

Swift Package Manager is an official Apple tool for managing the distribution of Swift code.

The Apple documentation can be used to add frameworks to an Xcode project.

Usage examples

Generate a key pair

Generate a private key using the default algorithm (EC_X25519):

import VirgilCrypto

let crypto = try! VirgilCrypto()
let keyPair = try! crypto.generateKeyPair()

Generate and verify a signature

Generate signature and sign data with a private key:

import VirgilCrypto

let crypto = try! VirgilCrypto()

// prepare a message
let messageToSign = "Hello, Bob!"
let dataToSign = messageToSign.data(using: .utf8)!

// generate a signature
let signature = try! crypto.generateSignature(of: dataToSign, using: senderPrivateKey)

Verify a signature with a public key:

import VirgilCrypto

let crypto = try! VirgilCrypto()

// verify a signature
let verified = try! crypto.verifySignature(signature, of: dataToSign, with: senderPublicKey)

Encrypt and decrypt data

Encrypt data with a public key:

import VirgilCrypto

let crypto = try! VirgilCrypto()

// prepare a message
let messageToEncrypt = "Hello, Bob!"
let dataToEncrypt = messageToEncrypt.data(using: .utf8)!

// encrypt the message
let encryptedData = try! crypto.encrypt(dataToEncrypt, for: [receiverPublicKey])

Decrypt the encrypted data with a Private Key:

import VirgilCrypto

let crypto = try! VirgilCrypto()

// prepare data to be decrypted
let decryptedData = try! crypto.decrypt(encryptedData, with: receiverPrivateKey)

// decrypt the encrypted data using a private key
let decryptedMessage = String(data: decryptedData, encoding: .utf8)!

Import and export keys

Export keys:

import VirgilCrypto

// generate a Key Pair
let crypto = VirgilCrypto()
let keyPair = try! crypto.generateKeyPair()

// export a Private key
let privateKeyData = try! crypto.exportPrivateKey(keyPair.privateKey, password: "YOUR_PASSWORD")
let privateKeyStr = privateKeyData.base64EncodedString()

// export a Public key
let publicKeyData = crypto.exportPublicKey(keyPair.publicKey)
let publicKeyStr = publicKeyData.base64EncodedString()

Import keys:

import VirgilCrypto

let crypto = VirgilCrypto()

let privateKeyStr = "MIGhMF0GCSqGSIb3DQEFDTBQMC8GCSqGSIb3DQEFDDAiBBBtfBoM7VfmWPlvyHuGWvMSAgIZ6zAKBggqhkiG9w0CCjAdBglghkgBZQMEASoEECwaKJKWFNn3OMVoUXEcmqcEQMZ+WWkmPqzwzJXGFrgS/+bEbr2DvreVgEUiLKrggmXL9ZKugPKG0VhNY0omnCNXDzkXi5dCFp25RLqbbSYsCyw="

let privateKeyData = Data(base64Encoded: privateKeyStr)!

// import a Private key
let privateKey = try! crypto.importPrivateKey(from: privateKeyData, password: "YOUR_PASSWORD")

//-----------------------------------------------------

let publicKeyStr = "MCowBQYDK2VwAyEA9IVUzsQENtRVzhzraTiEZZy7YLq5LDQOXGQG/q0t0kE="

let publicKeyData = Data(base64Encoded: publicKeyStr)!

// import a Public key
let publicKey = try! crypto.importPublicKey(from: publicKeyData)

Docs

License

This library is released under the 3-clause BSD License.

Support

Our developer support team is here to help you.

You can find us on Twitter or send us email support@VirgilSecurity.com.

Also, get extra help from our support team on Slack.