Public func decrypted(with key: PrivateKey, algorithm: Data.Algorithm) throws -> PlaintextData?

Question

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Public func decrypted(with key: PrivateKey, algorithm: Data.Algorithm) throws -> PlaintextData?

{

// Must be encrypted...
guard self.type == .encryptedType else {

throw Error(code: CryptorRSA.ERR_NOT_ENCRYPTED, reason: "Data is plaintext")
}

// Key must be private...
guard key.type == .privateType else {

throw Error(code: CryptorRSA.ERR_KEY_NOT_PUBLIC, reason: "Supplied key is not private")
}

#if os(Linux)

switch algorithm {
case .gcm:
return try decryptedGCM(with: key)
case .sha1, .sha224, .sha256, .sha384, .sha512:
// Same algorithm is used regardless of sha
return try decryptedCBC(with: key)
}

#else

var response: Unmanaged<CFError>? = nil
let pData = SecKeyCreateDecryptedData(key.reference, algorithm.alogrithmForEncryption, self.data as CFData, &response)
if response != nil {

guard let error = response?.takeRetainedValue() else {

throw Error(code: CryptorRSA.ERR_DECRYPTION_FAILED, reason: "Decryption failed. Unable to determine error.")
}

throw Error(code: CryptorRSA.ERR_DECRYPTION_FAILED, reason: "Decryption failed with error: \(error)")
}

return PlaintextData(with: pData! as Data)

#endif
}