CryptoRandInt63n returns a random int64 between zero and value of max obtained from the crypto rand source.

Int63n returns a int64 between zero and value of max, read from an io.Reader source.

NewUUID returns an initialized UUID value that can be used to retrieve random UUID version 4 values.

NewUUIDIdempotencyToken returns a idempotency token provider returning tokens in the UUID random format using the reader provided.

Reader provides a random reader that can reset during testing.

UUID provides computing random UUID version 4 values from a random source reader.

UUIDIdempotencyToken provides a utility to get idempotency tokens in the UUID format.