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License: MIT License
iOS keychain usage samples
License: MIT License
How can i use the Diffie-Hellman key exchange to encrypt and decrypt messages?
I'am able to generate the shared keys (for both bob and alice) but SecKeyCopyKeyExchangeResult
returns me a Data...how can i get SecKey to use with SecKeyCreateDecryptedData
and SecKeyCreateEncryptedData
?
So i think i should extract the SecKey somehow from the shared data so i can make symettrical encryption/decryption.
The code so far is:
let bob_shared_secret: NSData = generateSharedKey_ecdh(publicKey: alicePublicKey, privateKey: bobPrivateKey)!
let alice_shared_secret: NSData = generateSharedKey_ecdh(publicKey: bobPublicKey, privateKey: alicePrivateKey)!
print("equals? \(bob_shared_secret == alice_shared_secret)!") //true
let cipherTextData: Data? = SecKeyCreateEncryptedData(alicePublicKey, algorithm,
clearTextData as CFData,
&error) as Data?
let clearTextData = SecKeyCreateDecryptedData(???? as SecKey, //what to put here??
algorithm,
cipherTextData as CFData,
&error) as Data?
private func generateSharedKey_ecdh(publicKey: SecKey, privateKey: SecKey) -> NSData?
{
var error: Unmanaged<CFError>?
let keyPairAttr:[String : Any] = [
kSecAttrKeySizeInBits as String: 256, //retro compatibility
kSecAttrKeyType as String: kSecAttrKeyTypeECSECPrimeRandom, //Elliptic curve algorithm.
kSecPrivateKeyAttrs as String: [kSecAttrIsPermanent as String: false],
kSecPublicKeyAttrs as String:[kSecAttrIsPermanent as String: false],
SecKeyKeyExchangeParameter.requestedSize.rawValue as String: 256
]
let algorithm:SecKeyAlgorithm = SecKeyAlgorithm.ecdhKeyExchangeStandardX963SHA256
let shared:CFData? = SecKeyCopyKeyExchangeResult(privateKey, algorithm, publicKey, keyPairAttr as CFDictionary, &error)
return shared
}
I might be asking a really silly question but since in the examples we are instantiating a secKey every time, I am wondering, in a real application what would be a secure way to store this key in order to retrieve at app next run.
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