SCrypto
[Overview • Requirements • Installation • Usage • Alternatives • Licence]
Overview
SCrypto provides neat Swift interface to access the CommonCrypto routines.
Features
- Essential
DataandStringextensions for message digest, HMAC, PBKDF, symmetric encryption calculation - Swift 5.1 support
- Cocoapods, Carthage and Swift Package Manager compatible
- Comprehensive Unit Test Coverage
- Complete Documentation
- iOS and OS X support
Requirements
- iOS 9.0+ / macOS 10.11+
- Swift 3.0+
- Xcode 8.0+
Installation
Cocoapods
CocoaPods is a dependency manager for Cocoa projects. You can install it with the following command:
$ gem install cocoapods
To integrate SCrypto into your Xcode project using CocoaPods, specify it in your Podfile:
source 'https://github.com/CocoaPods/Specs.git'
platform :ios, '9.0'
use_frameworks!
pod 'SCrypto', '~> 2.0.0'
Then, run the following command:
$ pod install
Carthage
Carthage is a decentralized dependency manager that builds your dependencies and provides you with binary frameworks. You can install Carthage with Homebrew using the following command:
$ brew update
$ brew install carthage
To integrate SCrypto into your Xcode project using Carthage, specify it in your Cartfile:
github "sgl0v/SCrypto" ~> 1.0.0
Run carthage update to build the framework and drag the built SCrypto.framework into your Xcode project.
Swift Package Manager
You can add the SCrypto framework to your project via Swift Package Manager. Add the following line to the dependencies in your Package.swift file:
.package(url: "https://github.com/sgl0v/SCrypto", exact: "<latest version>"),
Finally, include "SCrypto" as a dependency for your executable target:
.target(name: "<target name>", dependencies: ["SCrypto"])
Manually
If you prefer not to use either of the mentioned dependency managers, you can integrate SCrypto into your project manually.
- Open up Terminal,
cdinto your top-level project directory, and run the following command "if" your project is not initialized as a git repository:
$ git init
- Add SCrypto as a git submodule by running the following command:
$ git submodule add https://github.com/sgl0v/SCrypto.git
-
Open the new
SCryptofolder, and drag theSCrypto.xcodeprojinto the Project Navigator of your application's Xcode project.The
SCrypto.xcodeprojshould appear nested underneath your application's blue project icon. Whether it is above or below all the other Xcode groups does not matter. -
Select the
SCrypto.xcodeprojin the Project Navigator and verify the deployment target matches that of your application target. -
Next, select your application project in the Project Navigator (blue project icon) to navigate to the target configuration window and select the application target under the "Targets" heading in the sidebar.
-
In the tab bar at the top of that window, open the "General" panel.
-
Click on the
+button under the "Embedded Binaries" section. -
You will see two different
SCrypto.xcodeprojfolders each with two different versions of theSCrypto.framework iOSnested inside aProductsfolder.It doesn't matter which
Productsfolder you choose from. -
Just select the
SCrypto.framework iOSand that's it!The
SCrypto.frameworkis automagically added as a target dependency and should appear as a linked and embedded framework in theBuild Phasessection.
Usage
Message Digest (MD5, SHA)
Message digests are secure one-way cryptographic hash functions that take arbitrary-sized data and output a fixed-length hash value.
let sha256 = "message".SHA256()
Keyed-hash message authentication code (HMAC)
Hash-based message authentication codes (or HMACs) provides a way for calculating message authentication codes using a cryptographic hash function coupled with a secret key. You can use an HMAC to verify both the integrity and authenticity of a message. The following standard hash algorithm are supported: SHA1, MD5, SHA256, SHA384, SHA512, SHA224.
let secretKey = try! Data.random(32)
let message = "message".data(using: String.Encoding.utf8)!
let hmac = message.hmac(.SHA256, key: secretKey)
Pseudorandom number generator (PRNG)
Generates cryptographically strong random bits suitable for use as cryptographic keys, IVs, nonces etc.
let randomBytes = try! Data.random(16)
Symmetric-key algorithms (AES, DES, TripleDES, CAST, RC2, RC4, Blowfish)
Symmetric-key algorithms use the same cryptographic keys for both encryption of plaintext and decryption of ciphertext. Note that symmetric encryption only provides secrecy but not integrity. There are recent encryption modes which combine symmetric encryption and checked integrity (not supported by CommonCrypto). For this reason it is strongly recommended to combine encryption with a HMAC.
Here is the way to encrypt and decrypt data via AES algorithm in CBC mode with PKCS7 Padding:
let plaintext = "plain text".data(using: String.Encoding.utf8)!
let sharedSecretKey = "shared_secret_key".data(using: String.Encoding.utf8)!.SHA256() // AES-256
let IV = try! Data.random(16) // Randomly generated IV. Length is equal to the AES block size(128)
let ciphertext = try! plaintext.encrypt(.AES, options: .PKCS7Padding, key: sharedSecretKey, iv: IV)
let plaintext2 = try! ciphertext.decrypt(.AES, options: .PKCS7Padding, key: sharedSecretKey, iv: IV)
Password-Based Key Derivation Function (PBKDF2)
Key derivation functions are used for turning a passphrase into an arbitrary length key for use as a cryptographic key in subsequent operations.
let password = "password".data(using: String.Encoding.utf8)!
let salt = try! Data.random(32)
let derivedKey = try! password.derivedKey(salt, pseudoRandomAlgorithm: .SHA256, rounds: 20, derivedKeyLength: 32)
Alternatives
Looking for something else? Try another Swift CommonCrypto wrappers:
Licence
SCrypto is MIT-licensed. See LICENSE.
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