Various improvements#55

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tladesignz wants to merge 15 commits intocontentauth:mainfrom

tladesignz:improvement/various

Commits on Jan 30, 2026

Giving `SigningAlgorithm` the `String` type, frees us from having to map types to a string value manually. `SigningAlgorithm.rawValue` will automatically contain the case identifier as string. `Cas…
tladesignz
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Make it easier to use the API correctly: use an enum instead of a free-form text string for a parameter which is only allowed to have 2 different values.
tladesignz
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Make use of `SigningAlgorithm`'s newly added String type: We can get rid of the switch here.
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Swiftier property names with `CodingKeys`.
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Replaced `print` with propper logging.
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With `Error` types, use `LocalizedError` instead of `CustomStringConvertible`. (Even when they're not localized. You're in good company with Apple…)
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Moved conversion of `SigningAlgorithm` to `SecKeyAlgorithm` from `KeychainSigner` to `SigningAlgorithm` to improve code clarity.
tladesignz
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Don't pollute the global namespace. Use the `C2PA` enum instead for version info.
tladesignz
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Fixed outdated documentation.
tladesignz
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Removed trailing whitespaces swiftlint complained about.
tladesignz
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