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diff --git a/native/expo-modules/aes-crypto/ios/AESCryptoModule.swift b/native/expo-modules/aes-crypto/ios/AESCryptoModule.swift
--- a/native/expo-modules/aes-crypto/ios/AESCryptoModule.swift
+++ b/native/expo-modules/aes-crypto/ios/AESCryptoModule.swift
@@ -1,11 +1,15 @@
import ExpoModulesCore
import CryptoKit
+private let IV_LENGTH = 12 // bytes
+private let TAG_LENGTH = 16 // bytes
+
public class AESCryptoModule: Module {
public func definition() -> ModuleDefinition {
Name("AESCrypto")
Function("generateKey", generateKey)
+ Function("encrypt", encrypt)
}
}
@@ -22,9 +26,35 @@
}
}
+private func encrypt(rawKey: Uint8Array,
+ plaintext: Uint8Array,
+ destination: Uint8Array) throws {
+ guard destination.byteLength >= plaintext.byteLength + IV_LENGTH + TAG_LENGTH
+ else {
+ throw InvalidDataLengthException()
+ }
+
+ let key = SymmetricKey(data: rawKey.data())
+ let iv = AES.GCM.Nonce()
+ let encryptionResult = try AES.GCM.seal(plaintext.data(),
+ using: key,
+ nonce: iv)
+
+ // 'combined' returns concatenated: iv || ciphertext || tag
+ guard let ciphertext = encryptionResult.combined else {
+ // this happens only if Nonce/IV != 12 bytes long
+ throw EncryptionFailedException("Incorrect AES configuration")
+ }
+ ciphertext.copyBytes(to: destination.rawBufferPtr())
+}
+
// MARK: - Utilities
extension TypedArray {
+ func data() -> Data {
+ Data(bytes: self.rawPointer, count: self.byteLength)
+ }
+
func rawBufferPtr() -> UnsafeMutableRawBufferPointer {
UnsafeMutableRawBufferPointer(start: self.rawPointer,
count: self.byteLength)
@@ -38,3 +68,15 @@
"The AES key has invalid length"
}
}
+
+private class InvalidDataLengthException: Exception {
+ override var reason: String {
+ "Source or destination array has invalid length"
+ }
+}
+
+private class EncryptionFailedException: GenericException<String> {
+ override var reason: String {
+ "Failed to encrypt data: \(param)"
+ }
+}
diff --git a/native/utils/aes-crypto-module.js b/native/utils/aes-crypto-module.js
--- a/native/utils/aes-crypto-module.js
+++ b/native/utils/aes-crypto-module.js
@@ -1,11 +1,19 @@
// @flow
import { requireNativeModule } from 'expo-modules-core';
+import invariant from 'invariant';
const KEY_SIZE = 32;
+const IV_LENGTH = 12;
+const TAG_LENGTH = 16;
const AESCryptoModule: {
+generateKey: (destination: Uint8Array) => void,
+ +encrypt: (
+ key: Uint8Array,
+ data: Uint8Array,
+ destination: Uint8Array,
+ ) => void,
} = requireNativeModule('AESCrypto');
export function generateKey(): Uint8Array {
@@ -13,3 +21,10 @@
AESCryptoModule.generateKey(key);
return key;
}
+
+export function encrypt(key: Uint8Array, data: Uint8Array): Uint8Array {
+ invariant(AESCryptoModule.encrypt, 'AESCrypto.encrypt is not implemented');
+ const ciphertext = new Uint8Array(data.length + IV_LENGTH + TAG_LENGTH);
+ AESCryptoModule.encrypt(key, data, ciphertext);
+ return ciphertext;
+}

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