Swiftpack.co - Package - cbaker6/CertificateSigningRequest


CI Status Codecov SPM Version License

Generate a certificate signing request (CSR) in iOS/macOS using Swift.


Supports RSA (key size: 512, 1024, 2048) and EC inside/outside of secure enclave (iOS only supports 256 bit keys for now), SHA1, SHA256, and SHA512.


Supports RSA (key size: 1024, 2048) and EC inside/outside of secure enclave, SHA1, SHA256, and SHA512.


To use, follow the following steps:

  1. Generate your publicKey/privateKey pair. This can be done using Keychain in iOS. An example can be found in the generateKeysAndStoreInKeychain function in the testfile.
  2. Get your publicKey in bits by querying it from the iOS keychain using String(kSecReturnData): true in your query. For example:
//Set block size
let keyBlockSize = SecKeyGetBlockSize(publicKey)
//Ask keychain to provide the publicKey in bits
let query: [String: Any] = [
    String(kSecClass): kSecClassKey,
    String(kSecAttrKeyType): algorithm.secKeyAttrType,
    String(kSecAttrApplicationTag): tagPublic.data(using: .utf8)!,
    String(kSecReturnData): true

var tempPublicKeyBits:CFTypeRef?
var _ = SecItemCopyMatching(query as CFDictionary, &tempPublicKeyBits)

guard let keyBits = tempPublicKeyBits as? Data else {
    return (nil,nil)
  1. Initiatlize the CertificateSigningRequest using KeyAlgorithm.ec or KeyAlgorithm.rsa (an example of how to do can be found in the test file. Below are 3 possible ways to initialize:
let csr = CertificateSigningRequest() //CSR with no fields, will use defaults of an RSA key with sha512
let algorithm = KeyAlgorithm.ec(signatureType: .sha256)
let csr = CertificateSigningRequest(keyAlgorithm: algorithm) //CSR with a specific key 
let csr = CertificateSigningRequest(commonName: String?, organizationName:String?, organizationUnitName:String?, countryName:String?, stateOrProvinceName:String?, localityName:String?, keyAlgorithm: algorithm) //Define all fields and key algorithm
  1. Then simply build your CSR using your publicKey(bits) and privateKey using:
let builtCSR = csr.buildCSRAndReturnString(publicKeyBits, privateKey: privateKey)
//Or if you want `CertificateSigningRequest` to verify the signature after building, pass in your publicKey to the same method:
let builtCSR = csr.buildCSRAndReturnString(publicKeyBits, privateKey: privateKey, publicKey: publicKey)
  • Two other methods are available depending on your needs.
  • To get CSR without header and footer info use: let builtCSR = csr.buildAndEncodeDataAsString(publicKeyBits, privateKey: privateKey).
  • To get CSR as Data use: let builtCSR = csr.build(publicKeyBits, privateKey: privateKey).


You can test if your CSRs are correct by running and setting a break point the test file. You can also let all test run and test the different CSR's. The output of the CSR will print in the console window. You can output the CSR's and your own app by printing to the console and check if they are created correctly by pasting them here: https://redkestrel.co.uk/products/decoder/ or by using openssl.


To run the example project, clone the repo, and run pod install from the Example directory first. An example certificate from this framework is below:


You can test if the CSR was created correctly here: https://redkestrel.co.uk/products/decoder/


  • iOS 9+
  • mac OS 10.12+


Swift Package Manager (SPM) - Option 1

CertificateSigningRequest can be installed via SPM. Open an existing project or create a new Xcode project and navigate to File > Swift Packages > Add Package Dependency. Enter the url https://github.com/cbaker6/CertificateSigningRequest.git and tap Next. Choose the main branch, and on the next screen, check off the package.

Cocoapods - Option 2

CertificateSigningRequest is available through CocoaPods. To install it, simply add the following line to your Podfile:

pod 'CertificateSigningRequest'

Embedded Framework - Option 3

If you would like to use as a framework, clone and build the project, look under frameworks, and drag "CertificateSigningRequest.framework" into "Frameworks" section of your project, "check copy if needed".

  • In your project Targets, click on "General", make sure "CertificateSigningRequest.framework" shows up under "Embedded Binaries" and it should automatically appear in "Linked Frameworks and Libraries"
  • Then, simply place import CertificateSigningRequest at the top of any file that needs the framework.


cbaker6, coreyearleon@icloud.com


Components of CertificateSigningRequest was originally in ios-csr by Ales Teska written in Objective-C and ported by the author of CertificateSigningRequest to Swift. Therefore CertificateSigningRequest has the same GPLv2 license. See the LICENSE file for more info.


Stars: 43


Used By

Total: 0


Added watchOS and tvOS support - 2020-08-29 13:55:42

Update - 2020-08-29 00:52:17

  • Added examples for using macOS
  • Added SPM tests

Minor updates - 2020-08-01 02:58:30

Added SPM support - 2020-04-29 23:54:16

Can now get the framework via spm or cocoapods.

Bug fix - 2020-04-29 17:57:07

In some corner cases, like when trying to create a CSR with an RSA 512bit key and SHA512 hash, an unfinished cert would be returned instead of returning nil.

Updated the readme to make using the framework more clear.

Works on cocoapods - 2020-04-29 01:53:55

Can now install via cocoapods

Release on cocoapods - 2020-04-29 01:36:43

Release on cocoapods - 2020-04-29 01:07:35

This release enables support on macOS and macCatalayst. These both need to be tested, specifically after the keys are generated correctly using Keychain.

Updated for cocoapods - 2020-04-28 19:31:54

This release enables support on macOS and macCatalayst. These both need to be tested, specifically after the keys are generated correctly using Keychain.

On cocoapods - 2020-04-27 19:32:55

Initial release on cocoapods - 2020-04-27 18:33:52