private SecKey GetDataEncryptionKey()
{
var query = new SecRecord(SecKind.Key)
{
ApplicationTag = APPLICATION_TAG,
};
var keys = SecKeyChain.QueryAsReference(query, 2, out var code);
if (code == SecStatusCode.Success)
{
return(keys[0] as SecKey);
}
SecKeyChain.Remove(query);
var key = SecKey.CreateRandomKey(SecKeyType.RSA, 2048, null, out var e);
if (e != null)
{
return(null);
}
var rec = new SecRecord(key)
{
ApplicationTag = APPLICATION_TAG,
KeyType = SecKeyType.RSA,
KeyClass = SecKeyClass.Private,
Accessible = SecAccessible.AfterFirstUnlock
};
var r = SecKeyChain.Add(rec);
if (r != SecStatusCode.Success)
{
System.Diagnostics.Debug.WriteLine($"CryptoImpl.cs: Could not add a new key pair to KeyChain. status = \"{r}\"\n"
+ " Please make sure \"Entitlements.plist\" is set for custom entitlements in project property page.");
return(null);
}
System.Diagnostics.Debug.WriteLine("CryptoImpl.cs: A new key encryption key pair was generated.");
return(key);
}
