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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,32 @@ | ||
| /* | ||
| * Unless explicitly stated otherwise all files in this repository are licensed under the Apache License Version 2.0. | ||
| * This product includes software developed at Datadog (https://www.datadoghq.com/). | ||
| * Copyright 2019-2020 Datadog, Inc. | ||
| */ | ||
|
|
||
| import Foundation | ||
| import CryptoKit | ||
| import CommonCrypto | ||
|
|
||
| /// Computes SHA256 for given `string`. | ||
| /// | ||
| /// The implementation is portable between iOS versions - it uses `CryptoKit` on iOS13+ and fallbacks | ||
| /// to `CommonCrypto` on older devices. | ||
| internal func sha256(_ string: String) -> String { | ||
| guard let data = string.data(using: .utf8) else { | ||
| return string | ||
| } | ||
|
|
||
| if #available(iOS 13.0, tvOS 13.0, *) { // Compute SHA256 with `CryptoKit` | ||
| let digest = SHA256.hash(data: data) | ||
| return digest | ||
| .map({ byte in String(format: "%02x", byte) }) | ||
| .joined(separator: "") | ||
| } else { // Fallback to SHA256 with `CommonCrypto` | ||
| var digest: [UInt8] = Array(repeating: 0, count: Int(CC_SHA256_DIGEST_LENGTH)) | ||
| _ = data.withUnsafeBytes { CC_SHA256($0.baseAddress, UInt32(data.count), &digest) } | ||
| return digest | ||
| .map({ byte in String(format: "%02x", byte) }) | ||
| .joined(separator: "") | ||
| } | ||
| } |
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31 changes: 31 additions & 0 deletions
31
Tests/DatadogTests/Datadog/Core/Utils/CryptographyTests.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,31 @@ | ||
| /* | ||
| * Unless explicitly stated otherwise all files in this repository are licensed under the Apache License Version 2.0. | ||
| * This product includes software developed at Datadog (https://www.datadoghq.com/). | ||
| * Copyright 2019-2020 Datadog, Inc. | ||
| */ | ||
|
|
||
| import XCTest | ||
| @testable import Datadog | ||
|
|
||
| class CryptographyTests: XCTestCase { | ||
| func testItComputesSHA256ForArbitraryString() { | ||
| (0..<20).forEach { _ in | ||
| // Given | ||
| let string: String = .mockRandom(among: .allUnicodes, length: .mockRandom(min: 1, max: 500)) | ||
|
|
||
| // When | ||
| let sha = sha256(string) | ||
|
|
||
| // Then | ||
| XCTAssertEqual(sha.count, 64, "It must use 64 characters") | ||
| XCTAssertFalse(sha.contains(where: { !$0.isASCII }), "It must contain only ASCII characters") | ||
| } | ||
| } | ||
|
|
||
| func testWhenComputingSHA256_itGivesStableResults() { | ||
| XCTAssertEqual(sha256(""), "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855") | ||
| XCTAssertEqual(sha256("foo"), "2c26b46b68ffc68ff99b453c1d30413413422d706483bfa0f98a5e886266e7ae") | ||
| XCTAssertEqual(sha256("Bar Bizz"), "ad81f738a40902ef4bb3e4d5f5b83d3e2b3b7edfcd1669ddd4004d4815d03a75") | ||
| XCTAssertEqual(sha256(".//,"), "822236197264817e14fdd2939d9dc68c7d0151a6265798dd29511315cb428c66") | ||
| } | ||
| } |
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