Cannot extract AES-encrypted archives with a £ character in the password

[tijme]

A user of my app noticed that ZIP-archives with a £ in the password cannot be decrypted. Please view the full details in the issue: https://github.com/raivo-otp/ios-application/issues/59.

Steps to reproduce

1. Create an AES-encrypted ZIP-archive using this library with the password ££qqqqqq
2. Export the file to a Windows machine
3. Try to decrypt it using 7-Zip

My code to create the ZIP-archive:

SSZipArchive.createZipFile(
    atPath: outputDirectory,
    withContentsOfDirectory: inputFilesPath,
    keepParentDirectory: false,
    compressionLevel: 0,
    password: password,
    aes: true
)

Expected behavior

The ZIP-archive should be extracted.

Actual behavior

It states the password is incorrect. If I create a ZIP-archive with the password qqqqqqqq (without ££) it does work, and 7-Zip is able to decrypt it.

Version of ZipArchive

2.4.2

Environmental information

Windows 11. iOS 15.