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Add Functions for Compressed and Uncompressed HashG2 With Domain (#2833)

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* add tests

* gaz

* lint
This commit is contained in:
Nishant Das
2019-06-21 08:43:03 +05:30
committed by GitHub
parent 35b67a3dcf
commit 7fb2ebf3f1
3 changed files with 36 additions and 1 deletions
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6
shared/bls/BUILD.bazel
View File

@@ -7,6 +7,7 @@ go_library(
visibility = ["//visibility:public"],
deps = [
"//shared/bytesutil:go_default_library",
"@com_github_phoreproject_bls//:go_default_library",
"@com_github_phoreproject_bls//g1pubs:go_default_library",
],
)
@@ -15,5 +16,8 @@ go_test(
name = "go_default_test",
srcs = ["bls_test.go"],
embed = [":go_default_library"],
deps = ["//shared/bytesutil:go_default_library"],
deps = [
"//shared/bytesutil:go_default_library",
"@com_github_phoreproject_bls//:go_default_library",
],
)

13
shared/bls/bls.go
View File

@@ -7,6 +7,7 @@ import (
"fmt"
"io"
"github.com/phoreproject/bls"
g1 "github.com/phoreproject/bls/g1pubs"
"github.com/prysmaticlabs/prysm/shared/bytesutil"
)
@@ -125,6 +126,18 @@ func AggregateSignatures(sigs []*Signature) *Signature {
return &Signature{val: g1.AggregateSignatures(ss)}
}
// HashG2WithDomainCompressed returns the compressed hash.
func HashG2WithDomainCompressed(msg [32]byte, domain uint64) [96]byte {
projective := bls.HashG2WithDomain(msg, domain)
return bls.CompressG2(projective.ToAffine())
}
// HashG2WithDomainUncompressed returns the uncompressed hash.
func HashG2WithDomainUncompressed(msg [32]byte, domain uint64) [192]byte {
projective := bls.HashG2WithDomain(msg, domain)
return projective.ToAffine().SerializeBytes()
}
// Domain returns the bls domain given by the domain type and the operation 4 byte fork version.
//
// Spec pseudocode definition:

18
shared/bls/bls_test.go
View File

@@ -5,6 +5,7 @@ import (
"crypto/rand"
"testing"
bls2 "github.com/phoreproject/bls"
"github.com/prysmaticlabs/prysm/shared/bls"
"github.com/prysmaticlabs/prysm/shared/bytesutil"
)
@@ -51,3 +52,20 @@ func TestVerifyAggregate(t *testing.T) {
t.Error("Signature did not verify")
}
}
func TestHashG2WithDomain(t *testing.T) {
var msg [32]byte
copy(msg[:], []byte{'H', 'E', 'L', 'L', 'O'})
domain := uint64(10)
compHash := bls.HashG2WithDomainCompressed(msg, domain)
unCompHash := bls.HashG2WithDomainUncompressed(msg, domain)
g2Affine, err := bls2.DecompressG2(compHash)
if err != nil {
t.Fatal(err)
}
if unCompHash != g2Affine.SerializeBytes() {
t.Errorf("Uncompressed and Compressed Hash do not point to the same affine point. Expected %#x but got %#x",
unCompHash, g2Affine.SerializeBytes())
}
}