Hash functions

Hashes

Poseidon hash of variable number of items.

import { hash1, hash2, hash3, /* etc */ } from '@unirep/utils'

hash1(items: any[]): bigint
hash2(items: any[]): bigint
hash3(items: any[]): bigint
...
hash8(items: any[]): bigint

genEpochKey

Calculate an epoch key. maxEpochKey is the maximum value for a key. The hash will be modded by this value, e.g. H(...) % maxEpochKey. For a binary tree this should be 2**depth.

import { genEpochKey } from '@unirep/utils'

genEpochKey(
    identityNullifier: bigint,
    attesterId: bigint,
    epoch: bigint | number,
    nonce: bigint | number,
    maxEpochKey: bigint | number
): bigint

genEpochNullifier

Calculate a user state transition nullifier.

import { genEpochNullifier } from '@unirep/utils'

genEpochNullifier(
    identityNullifier: bigint,
    attesterId: bigint | string,
    epoch: number | bigint
): bigint

genStateTreeLeaf

Calculate a state tree leaf for a user.

import { genStateTreeLeaf } from '@unirep/utils'

genStateTreeLeaf(
    idNullifier: bigint,
    attesterId: bigint | string,
    epoch: bigint | number,
    posRep: bigint | number,
    negRep: bigint | number,
    graffiti: bigint | number,
    timestamp: bigint | number
): bigint