Memory issue on encrypting large files

[tobiasjungnickel]

• ObjectivePGP version: 0.12.0
• Platform (iOS/macOS): iOS 11.4 / iPhone 7
• Installation method (CocoaPods/Carthage/...): CocoaPods

Description

When encrypting a "large" file (tested with 100M) our App's ShareExtension target using ObjPGP terminated due to memory issue. No error is thrown, only console output:
Message from debugger: Terminated due to memory issue
Program ended with exit code: 0

Steps to reproduce

Sample code to reproduce the issue:

class func encrypt(_ data: Data, addSignature sign: Bool, using keys: [Key], passphraseForKey passphraseBlock: ((Key) -> String?)? = nil) throws -> Data

[krzyzanowskim]

A known issue #102