Module `Tezos_raw_protocol_012_Psithaca.Seed_repr`Source

Tezos Protocol Implementation - Random number generation

This is not expected to be a good cryptographic random number generator. In particular this is supposed to be used in situations where the seed is a globally known information.

The only expected property is: It should be difficult to find a seed such that the generated sequence is a given one.

Random Generation

Sourcetype t

The state of the random number generator

Sourcetype seed

A random seed, to derive random sequences from

Sourcetype sequence

A random sequence, to derive random values from

Sourceval initialize_new : seed -> bytes list -> t

initialize_new state ident returns a new generator

Sourceval sequence : t -> int32 -> sequence

sequence state n prepares the n-th sequence of a state

Sourceval take : sequence -> bytes * sequence

Generates the next random value in the sequence

Sourceval take_int32 : sequence -> int32 -> int32 * sequence

take_int32 s bound generates the next random value as a bounded int32

parameter bound
must be a positive integer

raises Invalid_argument
"Seed_repr.take_int32" if bound <= 0

Sourceval take_int64 : sequence -> int64 -> int64 * sequence

take_int64 s bound generates the next random value as a bounded int64

parameter bound
must be a positive integer

raises Invalid_argument
"Seed_repr.take_int64" if bound <= 0

Predefined seeds

Sourceval empty : seed

Sourceval deterministic_seed : seed -> seed

Returns a new seed by hashing the one passed with a constant.

Sourceval initial_seeds : int -> seed list

initial_seeds n generates the first n seeds for which there are no nonces. The first seed is a constant value. The kth seed is the hash of seed (k-1) concatenated with a constant.

Entropy

Sourcetype nonce

A nonce for adding entropy to the generator

Sourceval nonce : seed -> nonce -> seed

Add entropy to the seed generator

Source

val make_nonce : 
  bytes ->
  nonce Tezos_protocol_environment_012_Psithaca.Error_monad.tzresult

Use a byte sequence as a nonce

Sourceval hash : nonce -> Nonce_hash.t

Compute the has of a nonce

Sourceval check_hash : nonce -> Nonce_hash.t -> bool

check_hash nonce hash is true if the nonce correspond to the hash

Sourceval nonce_hash_key_part : Nonce_hash.t -> string list -> string list

For using nonce hashes as keys in the hierarchical database

Predefined nonce

Sourceval initial_nonce_0 : nonce

Sourceval initial_nonce_hash_0 : Nonce_hash.t

Serializers

Source

val nonce_encoding : 
  nonce Tezos_protocol_environment_012_Psithaca.Data_encoding.t

Source

val seed_encoding : 
  seed Tezos_protocol_environment_012_Psithaca.Data_encoding.t

Install

Dune Dependency

Authors

Maintainers

Sources

doc/tezos-protocol-012-Psithaca.raw/Tezos_raw_protocol_012_Psithaca/Seed_repr/index.html

Module `Tezos_raw_protocol_012_Psithaca.Seed_repr`Source

Random Generation

Predefined seeds

Entropy

Predefined nonce

Serializers

package tezos-protocol-012-Psithaca

Install

Dune Dependency

Authors

Maintainers

Sources

doc/tezos-protocol-012-Psithaca.raw/Tezos_raw_protocol_012_Psithaca/Seed_repr/index.html

Module Tezos_raw_protocol_012_Psithaca.Seed_reprSource

Random Generation

Predefined seeds

Entropy

Predefined nonce

Serializers

Module `Tezos_raw_protocol_012_Psithaca.Seed_repr`Source