Samuel Hawksby-Robinson c8f9dad554
Feature/key compression (#1990)
## What has changed?

I've introduced to the public binding functionality that will compress and decompress public keys of a variety of encoding and key types. This functionality supports all major byte encoding formats and the following EC public key types:

- `secp256k1` pks
- `bls12-381 g1` pks
- `bls12-381 g2` pks

## Why make the change?

We want shorter public (chat) keys and we want to be future proof and encoding agnostic. See the issue here https://github.com/status-im/status-go/issues/1937

---

* Added basic signature for compresspk and uncompresspk

* Added basic encoding information

* make vendor

* formatted imports for the linter

* Reformatted imports hoping linter likes it

* This linter is capricious

* Added check that the secp256k1 key is valid

* Added test for valid key

* Added multiformat/go-varint dep

* Added public key type handling

* Added key decompression with key type handling

* Added handling for '0x' type indentifying

* Added more robust testing

* Less lint for the linting gods

* make vendor for bls12_381

* Added bls12-381 compression tests

* Added decompress key expected results

* Refactor of typed and untyped keys in tests

* Lint god appeasment

* Refactor of sample public keys

* Implemented bls12-381 decompression

* gofmt

* Renamed decode/encode funcs to be more descriptive

* Added binary bindings for key de/compression

* Refactor of func parameters

gomobile is a bit tempermental using raw bytes as a parameter, so I've decided to use string only inputs and outputs

* gofmt

* Added function documentation

* Moved multiformat de/compression into api/multiformat ns

* Moved multiformat de/compression into api/multiformat ns

* Changed compress to serialize on API
2020-06-23 11:47:17 +01:00

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Go

// +build amd64,!generic
package bls12381
import (
"golang.org/x/sys/cpu"
)
func init() {
if !cpu.X86.HasADX || !cpu.X86.HasBMI2 {
mul = mulNoADX
}
}
var mul func(c, a, b *fe) = mulADX
func square(c, a *fe) {
mul(c, a, a)
}
func neg(c, a *fe) {
if a.isZero() {
c.set(a)
} else {
_neg(c, a)
}
}
//go:noescape
func add(c, a, b *fe)
//go:noescape
func addAssign(a, b *fe)
//go:noescape
func ladd(c, a, b *fe)
//go:noescape
func laddAssign(a, b *fe)
//go:noescape
func double(c, a *fe)
//go:noescape
func doubleAssign(a *fe)
//go:noescape
func ldouble(c, a *fe)
//go:noescape
func sub(c, a, b *fe)
//go:noescape
func subAssign(a, b *fe)
//go:noescape
func lsubAssign(a, b *fe)
//go:noescape
func _neg(c, a *fe)
//go:noescape
func mulNoADX(c, a, b *fe)
//go:noescape
func mulADX(c, a, b *fe)