19 lines
1.1 KiB
Swift
19 lines
1.1 KiB
Swift
import SessionUtilitiesKit
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import Sodium
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extension MessageSender {
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internal static func encryptWithSessionProtocol(_ plaintext: Data, for recipientHexEncodedX25519PublicKey: String) throws -> Data {
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guard let userED25519KeyPair = SNMessagingKitConfiguration.shared.storage.getUserED25519KeyPair() else { throw Error.noUserED25519KeyPair }
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let recipientX25519PublicKey = Data(hex: recipientHexEncodedX25519PublicKey.removing05PrefixIfNeeded())
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let sodium = Sodium()
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let verificationData = plaintext + Data(userED25519KeyPair.publicKey) + recipientX25519PublicKey
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guard let signature = sodium.sign.signature(message: Bytes(verificationData), secretKey: userED25519KeyPair.secretKey) else { throw Error.signingFailed }
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let plaintextWithMetadata = plaintext + Data(userED25519KeyPair.publicKey) + Data(signature)
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guard let ciphertext = sodium.box.seal(message: Bytes(plaintextWithMetadata), recipientPublicKey: Bytes(recipientX25519PublicKey)) else { throw Error.encryptionFailed }
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return Data(ciphertext)
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}
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}
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