Occasional Encoding Error about postgres-kit HOT 3 CLOSED

RussBaz commented on June 12, 2024

Occasional Encoding Error

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Comments (3)

RussBaz commented on June 12, 2024

OK, it turns out that the key can indeed sometimes contain \0 sequence, and it breaks Postgres… Any recommendations on how to possibly store such a data?

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gwynne commented on June 12, 2024

The classical approach would be Base64 encoding:

extension SymmetricKey: LosslessStringConvertible {
    public init?(_ description: String) {
        guard let data = Data(base64Encoded: description) else {
            return nil
        }
        self.init(data: data)
    }

    public var description: String {
        self.withUnsafeBytes { Data($0).base64EncodedString() }
    }

    init(_ key: String, size: SymmetricKeySize = .bits192) throws {
        guard let data = Data(base64Encoded: key) else {
            throw CryptoKitError.incorrectParameterSize
        }
        guard data.count size.bitCount >> 3 else {
            throw CryptoKitError.incorrectKeySize
        }
        self.init(data: data)
    }
}

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gwynne commented on June 12, 2024

The alternative would be to store it directly as [UInt8] (using .array(of: .uint8) in the migration) instead of doing String conversions of any kind (which are relatively expensive even for simple hexadecimal representation, much less Base64).

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