public void DoubleHash_ConsistentHashForSameValue()
{
var guid = Guid.NewGuid();
Assert.Equal(SelectByHashedProperty.DoubleHashAsIdStandIn(guid.ToString(), null),
SelectByHashedProperty.DoubleHashAsIdStandIn(guid.ToString(), null));
}
public void DoubleHash_WorksWithIntermediateValue()
{
var guid = Guid.NewGuid();
var raw = guid.ToString();
var single = SelectByHashedProperty.HashForDatabaseValue(raw);
var doubleHash = Convert.ToBase64String(SHA256.HashData(Convert.FromBase64String(single)));
Assert.Equal(Convert.ToBase64String(SHA256.HashData(SHA256.HashData(Encoding.UTF8.GetBytes(raw)))),
doubleHash);
// For some reason this doesn't result in the right values, even though the roundtrip as bytes in a string
// should work
// Assert.Equal(doubleHash,
// SelectByHashedProperty.HashForDatabaseValue(Encoding.UTF8.GetString(Convert.FromBase64String(single))));
var tempQuery = Convert.FromBase64String(doubleHash).Take(sizeof(long));
if (BitConverter.IsLittleEndian)
{
tempQuery = tempQuery.Reverse();
}
var doubleLong = BitConverter.ToInt64(tempQuery.ToArray(), 0);
Assert.Equal(SelectByHashedProperty.DoubleHashAsIdStandIn(raw, single),
SelectByHashedProperty.DoubleHashAsIdStandIn(raw, null));
Assert.Equal(doubleLong, SelectByHashedProperty.DoubleHashAsIdStandIn(raw, null));
Assert.Equal(doubleLong, SelectByHashedProperty.DoubleHashAsIdStandIn(raw, single));
Assert.Throws <ArgumentNullException>(() => SelectByHashedProperty.DoubleHashAsIdStandIn(null !, null));
SelectByHashedProperty.DoubleHashAsIdStandIn(null !, single);
}
public void DoubleHash_NoCollisionWithRandomValues()
{
// Just a sanity thing to make sure some values don't have collisions
Assert.NotEqual(SelectByHashedProperty.DoubleHashAsIdStandIn(Guid.NewGuid().ToString(), null),
SelectByHashedProperty.DoubleHashAsIdStandIn(Guid.NewGuid().ToString(), null));
var testString = "JustARandomTextString";
Assert.NotEqual(SelectByHashedProperty.DoubleHashAsIdStandIn(testString, null),
SelectByHashedProperty.DoubleHashAsIdStandIn(testString + "a", null));
}
public long GetDoubleHashedId()
{
return(SelectByHashedProperty.DoubleHashAsIdStandIn(Id.ToString(), HashedId));
}
