A service allowing a DM to request a roll from a Player and the player to respond with a secure roll that is guaranteed not to be tampered with. This is done by a series of signatures applied to json payloads using the JWS protocol.

This package also defines a set of libraries for composing rolls and using the secure rand facility on the current platform to produce cryptographically secure random numbers.

A roll is a single die roll or a combination of die rolls manipulated in a few different ways. The following are the types of rolls supported by this service:

A constant in roll expression that is not used by the single die roll term or the Multiple Homogeneous Die Roll term.

The traditional d4, d6, d8, d10, d12, d20, or d100. But since we are using a computer to roll the dice, we can use as many sides as we want. Therefore anything that can match d[0-9]+ is allowed. That means d7 or d81 ...

Rolling a character for your new DnD 5e compaign. Then roll 6 separate 3d6 for your stats.

While the discarding feature can be applied to any die roll that produces multiple base results it is most often used with the Multiple Homogeneous Die Rolls described above. For instance, say you want to let your players have a better chance at high stats. You might choose to allow them to roll 4d6 for their stats and discard the lowest roll. To do this you would request a 4d6D1. For the opposite affect you would ask for a 4d6D>1, the > tells the roller to discard the higher values.

Let's say one of your characters has a class feature that allows them to reroll all 1s in their damage roll. You might do a 10d6r<2

Any two rolls or constants can be multiplied. For instance d6 * d8 would roll a d6 and multiply the result by the result of rolling a d8. Also, d6 * 2 is legal and would result in an even number between 2 and 12 inclusive.

Any two rolls or constants can be summed. For instance d6 + d8 would roll a d6 and add the result to the result of rolling a d8.