Hi, I try to decrypt some string. Does this code looks good? I get error: CryptoKit.CryptoKitError error 3.
do {
guard let encryptedData = Data(base64Encoded: cardNumber),
let securityKeyData = Data(base64Encoded: securityKey),
let ivData = Data(base64Encoded: iv),
let privateKeyData = Data(base64Encoded: privateKey) else {
throw NSError(domain: "invalid_input", code: 1, userInfo: [NSLocalizedDescriptionKey: "Invalid Base64 input."])
}
let privateKey = try P256.KeyAgreement.PrivateKey(derRepresentation: privateKeyData)
let publicKey = try P256.KeyAgreement.PublicKey(derRepresentation: securityKeyData)
let sharedSecret = try privateKey.sharedSecretFromKeyAgreement(with: publicKey)
let symmetricKey = sharedSecret.hkdfDerivedSymmetricKey(
using: SHA256.self,
salt: Data(),
sharedInfo: Data(),
outputByteCount: 32
)
let encryptedDataWithoutTag = encryptedData.dropLast(16)
let tagData = encryptedData.suffix(16)
let nonce = try AES.GCM.Nonce(data: ivData)
let sealedBox = try AES.GCM.SealedBox(nonce: nonce, ciphertext: encryptedDataWithoutTag, tag: tagData)
let decryptedData = try AES.GCM.open(sealedBox, using: symmetricKey)
resolve(decryptedCardNumber)
} catch {
print("Decryption failed with error: \(error.localizedDescription)")
reject("decryption_error", "Decryption failed with error: \(error.localizedDescription)", nil)
}
Maciejjj
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