There are multiple ways to encrypt a photo in Swift before uploading it to the Firestore on Firebase. One approach could be to use AES encryption. Here are the steps to achieve this:
guard let image = UIImage(named: "myImage.png") else { return }
guard let imageData = image.pngData() else { return }
let key = AES256.randomKey()
let encryptedData = try? AES256.encrypt(data: imageData, key: key)
// Save the encrypted data
let encryptedImageRef = storageRef.child("encryptedImage.png")
let uploadTask = encryptedImageRef.putData(encryptedData, metadata: nil) { metadata, error in
if let error = error {
print("Error uploading encrypted image: \(error.localizedDescription)")
return
}
print("Encrypted image uploaded successfully!")
}
// Save the encryption key
let encryptedKeyRef = firestoreRef.collection("keys").document()
encryptedKeyRef.setData(["key": key]) { error in
if let error = error {
print("Error saving encryption key: \(error.localizedDescription)")
return
}
print("Encryption key saved successfully!")
}
// Retrieve the encrypted data
encryptedImageRef.getData(maxSize: 1 * 1024 * 1024) { data, error in
if let error = error {
print("Error retrieving encrypted image: \(error.localizedDescription)")
return
}
// Retrieve the encryption key
encryptedKeyRef.getDocument { snapshot, error in
if let error = error {
print("Error retrieving encryption key: \(error.localizedDescription)")
return
}
guard let data = data, let key = snapshot?.data()?["key"] as? Data else { return }
let decryptedData = try? AES256.decrypt(data: data, key: key)
let decryptedImage = UIImage(data: decryptedData!)
}
}
Note that AES encryption can consume a significant amount of CPU resources, especially for large images. Therefore, it may not be suitable for all use cases. In addition, it's important to keep the encryption key secure, as anyone with access to the key can decrypt the data.
Asked: 2023-07-05 15:37:34 +0000
Seen: 14 times
Last updated: Jul 05 '23