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# cirpedersen
# CircomLib
Pedersen Hash and Exponentiation circuits using Baby Jub Curve in circom language
## Description
- This repository contains a library of circuit templates.
- All files are copyrighted under 2018 0KIMS association and part of the free software [circom](https://github.com/iden3/circom) (Zero Knowledge Circuit Compiler).
## Organisation
This respository contains 5 folders:
- `circuits`: it contains the implementation of different cryptographic primitives in circom language.
- `calcpedersenbases`: set of functions in JavaScript used to find a set of points in [Baby Jubjub](https://github.com/barryWhiteHat/baby_jubjub) elliptic curve that serve as basis for the [Pedersen Hash](https://github.com/zcash/zcash/issues/2234).
- `doc`: it contains some circuit schemes in ASCII (must be opened with Monodraw, an ASCII art editor for Mac).
- `src`: it contains similar implementation of circuits in JavaScript.
- `test`: tests.
A description of the specific circuit templates for the `circuit` folder will be soon updated.

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# CircomLib/Circuits
## Description
- This folder contains circuit templates for standard operations and many cryptographic primitives.
- Below you can find specifications of each function. In the representation of elements, there are three tyes:
- Binary
- String
- Field element (the field is specified in each case. We consider 2 possible fields: Fp and Fr, where p... and r... .)
## Table of Contents
[TOC]
## Jordi
* compconstant - Returns 1 if `in` (expanded to binary array) > `ct`
* aliascheck - check if `in` (expanded to binary array) oveflowed its 254 bits (<= -1)
* babyjub - twisted Edwards curve 168700.x^2 + y^2 = 1 + 168696.x^2.y^2
@ -11,4 +27,804 @@
* zcash/zcash#2233
* smt - Sparse Merkle Tree
* https://ethresear.ch/t/optimizing-sparse-merkle-trees/3751
* montgomery https://en.wikipedia.org/wiki/Montgomery_curve
* montgomery https://en.wikipedia.org/wiki/Montgomery_curve
## Circuits
### sha256
Folder containing the implementation of sha256 hash circuit.
### smt
Folder containing the circuit implementation of Sparse Merkle Trees.
### aliascheck
- `AliasCheck()`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
### babyjub
Arithmetic on [Baby Jubjub elliptic curve](https://github.com/barryWhiteHat/baby_jubjub) in twisted Edwards form. (TODO: Expose here the characteristics of the curve?)
- `BabyAdd()`
- DESCRIPTION
It adds two points on the Baby Jubjub curve. More specifically, given two points P1 = (`x1`, `y1`) and P2 = (`x2`, `y2`) it returns a point P3 = (`xout`, `yout`) such that
(`xout`, `yout`) = (`x1`,`y1`) + (`x2`,`y2`)
= ((`x1y2`+`y1x2`)/(1+`dx1x2y1y2`)),(`y1y2`-`ax1x2`)/(1-`dx1x2y1y2`))
- SCHEMA
```
var a var d
| |
| |
______v_________v_______
input x1 ----> | |
input y1 ----> | BabyAdd() | ----> output xout
input x2 ----> | | ----> output yout
input y2 ----> |________________________|
```
- INPUTS
| Input | Representation | Description | |
| ------------- | ------------- | ------------- | ------------- |
| `x1` | Bigint | Field element of Fp | First coordinate of a point (x1, y1) on E. |
| `y1` | Bigint | Field element of Fp | Second coordinate of a point (x1, y1) on E. |
| `x2` | Bigint | Field element of Fp | First coordinate of a point (x2, y2) on E. |
| `y2` | Bigint | Field element of Fp | Second coordinate of a point (x2, y2) on E. |
Requirement: at least `x1`!=`x2` or `y1`!=`y2`.
- OUTPUT
| Input | Representation | Description | |
| ------------- | ------------- | ------------- | ------------- |
| `xout` | Bigint | Field element of Fp | First coordinate of the addition point (xout, yout) = (x1, y1) + (x2, y2). |
| `yout` | Bigint | Field element of Fp | Second coordinate of the addition point (xout, yout) = (x1, y1) + (x2, y2). |
- BENCHMARKS (constraints)
- EXAMPLE
- `BabyDbl()`
- DESCRIPTION : doubles a point (`xout`,`yout`) = 2*(`x`,`y`).
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `BabyCheck()`
- DESCRIPTION : checks if a given point is in the curve.
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `BabyPbk()`
- DESCRIPTION: : given a private key, it returns the associated public key.
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
### binsub
- `BinSub(n)`
- DESCRIPTION: binary substraction.
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
### binsum
- `nbits(a)`
- DESCRIPTION : binary sum.
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `BinSum(n, ops)`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
### bitify
- `Num2Bits()`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `Num2Bits_strict()`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `Bits2Num()`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `Bits2Num_strict()`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `Num2BitsNeg()`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
### comparators
- `IsZero() `
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `IsEqual()`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `ForceEqualIfEnabled()`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `LessThan()`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `GreaterThan()`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `GreaterEqThan()`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
### compconstant
- `CompConstant(ct)`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
### eddsa
Edwards Digital Signature Algorithm in Baby Jubjbub (link a eddsa)
- `EdDSAVerifier(n)`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
### eddsamimc
- `EdDSAMiMCVerifier()`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
### eddsamimcsponge
- `EdDSAMiMCSpongeVerifier()`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
### eddsaposeidon
- `EdDSAPoseidonVerifier()`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
### escalarmul
- `EscalarMulWindow(base, k)`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `EscalarMul(n, base)`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
### escalarmulany
- `Multiplexor2()`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `BitElementMulAny()`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `SegmentMulAny(n)`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `EscalarMulAny(n)`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
### escalarmulfix
- `WindowMulFix()`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `SegmentMulFix(nWindows)`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `EscalarMulFix(n, BASE)`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
### escalarmulw4table
- `pointAdd`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `EscalarMulW4Table`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
### gates
- `XOR`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `AND`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `OR`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `NOT`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `NAND`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `NOR`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `MultiAND`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
### mimc
Implementation of MiMC-7 hash in Fp being... (link to description of the hash)
- `MiMC7(nrounds)`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `MultiMiMC7(nInputs, nRounds)`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
### mimcsponge
- `MiMCSponge(nInputs, nRounds, nOutputs)`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `MiMCFeistel(nrounds)`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
### montgomery
- `Edwards2Montgomery()`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `Montgomery2Edwards()`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `MontgomeryAdd()`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `MontgomeryDouble()`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
### multiplexer
- `log2(a)`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `EscalarProduct(w)`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `Decoder(w)`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `Multiplexer(wIn, nIn)`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
### mux1
- `MultiMux1(n)`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `Mux1()`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
### mux2
- `MultiMux2(n)`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `Mux2()`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
### mux3
- `MultiMux3(n)`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `Mux3()`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
### mux4
- `MultiMux4(n)`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `Mux4()`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
### pedersen_old
Old version of the Pedersen hash (do not use any
more?).
### pedersen
- `Window4()`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `Segment(nWindows)`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `Pedersen(n)`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
### pointbits
- `sqrt(n)`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `Bits2Point()`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `Bits2Point_Strict()`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `Point2Bits`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `Point2Bits_Strict`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
### poseidon
Implementation of Poseidon hash function (LINK)
- `Sigma()`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `Ark(t, C)`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `Mix(t, M)`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
- `Poseidon(nInputs, t, nRoundsF, nRoundsP)`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
### sign
- `Sign()`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE
### switcher
- `Switcher()`
- DESCRIPTION
- SCHEMA
- INPUT
- OUTPUT
- BENCHMARKS
- EXAMPLE

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