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Barret reduction for modexp #170

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Barret reduction for modexp #170

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@fkrause98 fkrause98 commented Oct 23, 2023 •
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Pending tasks:

  • Finish barret_reduction implementation.
  • Precalculate needed constants.
  • Do not hardcode addresses.
  • Add the necessary scratch buffers.
  • Integrate into modexp respecting the following:
    1. Make sure this reduction is done AFTER the first loop so the base is inside the [0, n**2) range.
    2. Make sure the reduction is not used if the modulo is a power of 2, which can done "easily" through
    ands.

Useful references:

ilitteri and others added 30 commits September 22, 2023 13:11
@ilitteri
Initial new implementation
7e59313
@ilitteri
Fix compilation error
9206d42
@IAvecilla
Implementation of add operation for big integers (#136)
9f11e74
@ilitteri
Implement Big UInt Left Shift (#139)
db34989 
* Add `bigUIntShl` implementation

* Add constants

* Fix compilation
@ilitteri
Implement Big UInt Right Shift (#137)
c954c0c 
* Add `bigUIntShr` implementation

* Add constants
@jpcenteno @ilitteri
Implement Big UInt Bitwise Or for modexp (#135)
16558cb 
* Implement bigUIntBitOr

* Fix bigUIntBitOr

* Fix bigUIntBitOr

Co-authored-by: Ivan Litteri <[email protected]>

* Fix missing closing brackets

---------

Co-authored-by: Ivan Litteri <[email protected]>
@jpcenteno @ilitteri
Implement big uint conditional select for modexp (#148)
b1645c0 
* Implement bigUIntCondSelect

* Fix missing curly braces

Co-authored-by: Ivan Litteri <[email protected]>

* Implement Big UInt Right Shift (#137)

* Add `bigUIntShr` implementation

* Add constants

* Implement Big UInt Bitwise Or for modexp (#135)

* Implement bigUIntBitOr

* Fix bigUIntBitOr

* Fix bigUIntBitOr

Co-authored-by: Ivan Litteri <[email protected]>

* Fix missing closing brackets

---------

Co-authored-by: Ivan Litteri <[email protected]>

---------

Co-authored-by: Ivan Litteri <[email protected]>
@IAvecilla
Implement mul operation for big UInts (#151)
02db93f 
* First implementation of mul operation for bigints

* Fix multiplication for big integers

* Fix some merge issues

* Improve comments and function docs

* Delete whitespaces
@fkrause98 @jpcenteno @ilitteri
Substraction with borrow (#149)
2ff02cc 
* First substraction draft

* Fix compile problems

* Working implementation

* Updated code

* Updated code

* Update subtract implementation

* Remove console_log

* Add docs for function

* Update function docs

* Remove tests from from ModExp.yul

* Fix typo

* Restore horrible whitespaces to avoid an ugly merge conflict

* Update precompiles/Modexp.yul

Co-authored-by: Ivan Litteri <[email protected]>

* Revert "Update precompiles/Modexp.yul"

This reverts commit 582bc41.

---------

Co-authored-by: Joaquín P. Centeno <[email protected]>
Co-authored-by: Ivan Litteri <[email protected]>
@ilitteri
Refactor modexp reimplementation (#156)
b86bed6 
* Make Big UInt API functions naming consistent

* Refactor `bigUIntAdd` variable names

* Refactor `bigUIntMul` variable names

* Refactor `subLimbsWithBorrow`

* Refactor `bigUintSubtractionWithBorrow`

* Refactor `bigUIntAdd`

* Fix `bigUIntSubWithBorrow`

* Format `storeLimbValueAtOffset`

* Refactor `bigUIntBitOr`

Made it consistent with the rest of the code convention and naming

* Refactor `bigUIntCondSelect`

Made it consistent with the rest of the code convention and naming

* Reorder `overflowingSubWithBorrow`

* Move comment to modexp API Docs section
@jpcenteno @fkrause98
@IAvecilla @ilitteri
Biguint division (#159)
4a6a723 
* Division draft

* Non working draft

* Fix compile errors

* Use proper pointers for quotient and remainder

* Add fix note, some more changes

* Add comment

* Implement `big_uint_bit_size`

* Increase pointer to prevent it from steping over console_log

* WIP divrem

* Fix loop and zero initializer

* Push test cases

* Add other test case

* Add docs and tests for `big_uint_inplace_or_1`

* Fix bug related to bit shifting

* Fix borrow return in big uint sub function

* Delete playground file used for debugging

* Fix sub with borrow function

* Add playground again to check more big integer division tests

* Remove playground used for testing

* Write documentation for new shift functions

* Improve naming and documentation for new helper functions

* Rename bigUIntOrWith1 to bigUintInPlaceOrWith1

* Add tmp buffer parameters to bigUIntDivRem. Improve docs.

* Simplify subLimbsWithBorrow

Co-authored-by: Ivan Litteri <[email protected]>

* Remove `mul` call from `bigUIntInPlaceOrWith1`

Co-authored-by: Ivan Litteri <[email protected]>

* Remove multiplications from copyBigUint

Co-authored-by: Ivan Litteri <[email protected]>

* Optimize bigUIntBitSize loop

Co-authored-by: Ivan Litteri <[email protected]>

* Simplify zeroWithLimbSizeAt

---------

Co-authored-by: Francisco Krause Arnim <[email protected]>
Co-authored-by: IAvecilla <[email protected]>
Co-authored-by: Ivan Litteri <[email protected]>
@IAvecilla @fkrause98 @jpcenteno
Implement mul mod operation for big UInts (#161)
06df32c 
* Division draft

* Non working draft

* Fix compile errors

* Use proper pointers for quotient and remainder

* Add fix note, some more changes

* Add comment

* Implement `big_uint_bit_size`

* Increase pointer to prevent it from steping over console_log

* WIP divrem

* Fix loop and zero initializer

* Push test cases

* Add other test case

* Add docs and tests for `big_uint_inplace_or_1`

* Fix bug related to bit shifting

* Fix borrow return in big uint sub function

* Delete playground file used for debugging

* Fix sub with borrow function

* Add playground again to check more big integer division tests

* Remove playground used for testing

* Write documentation for new shift functions

* Improve naming and documentation for new helper functions

* Rename bigUIntOrWith1 to bigUintInPlaceOrWith1

* Add tmp buffer parameters to bigUIntDivRem. Improve docs.

* Add big uint mul mod skeleton

* Remove wrong comment

* Update algorithm comment

* Add limb size doubling and divide by two for mul mod operation

* Functions to duplicate and halve limb size work in place

* Use camelCase

* Remove console_log

* Add docs

* Update doc

---------

Co-authored-by: Francisco Krause Arnim <[email protected]>
Co-authored-by: Joaquín P. Centeno <[email protected]>
@fkrause98
Add parseCallData function
1fc184d
@IAvecilla
Add function to left-pad big uints
174b160
@ilitteri
Merge branch 'main' of github.com:lambdaclass/zksync_era_precompiles …
92010d6 
…into modexp_reimplementation
@IAvecilla
Remove console log function
776dc1d
@IAvecilla
Change left padding functions for big uints to not work in place
3c0f00c
@ilitteri
Add parseCalldata function (#168)
1b8b2f6
@fkrause98
Remove redundant parse call data declaration
b775975
@fkrause98 @ilitteri
Free memory pointer (#169)
ebc92a8 
* Add free memory pointer function

* Update precompiles/Modexp.yul

Co-authored-by: Ivan Litteri <[email protected]>

* Update precompiles/Modexp.yul

Co-authored-by: Ivan Litteri <[email protected]>

---------

Co-authored-by: Ivan Litteri <[email protected]>
@IAvecilla
Start parsing the input calldata
55ace22
@fkrause98
Correctly parse call data
bfbcbae
@IAvecilla
Add left pad steps for modexp inputs
4fabd3c
@fkrause98
Add pad if needed function
1f51a9e
@jpcenteno @IAvecilla
@ilitteri @fkrause98
Modexp for big UInts skeleton (#164)
730931e 
* WIP: modexp skeleton

* Use of mul mod function for big integers

* imlement aux function to check if big uint is larger than 1

* minor fix

* Restore modexp from target branch

* Fix mul mod

* Finish modexp implementation

* Remove playground used for debugging

* Update modexp with final state of modular exponentiation function

* Fix merge issue

* Change all names to camel case

* fix typo

Co-authored-by: Francisco Krause Arnim <[email protected]>

---------

Co-authored-by: IAvecilla <[email protected]>
Co-authored-by: Ivan Litteri <[email protected]>
Co-authored-by: Francisco Krause Arnim <[email protected]>
@fkrause98
Add simple integration
54fe792
@IAvecilla
Fix calldata buffer in zero check
2ecd8a3
@IAvecilla
Uncomment checks for base cases
027ccfe
@IAvecilla
Fix result length to match with mod length
01f69aa
@IAvecilla
Fix condition in parse call data
b7da051
@fkrause98 fkrause98 marked this pull request as draft October 23, 2023 21:21
Base automatically changed from modexp_reimplementation to main October 30, 2023 23:21
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4 participants
@fkrause98 @ilitteri @IAvecilla @jpcenteno