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oprf: Updating test vectors for VOPRF rc-rfc. #388

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merged 1 commit into from Jan 19, 2023
Merged

oprf: Updating test vectors for VOPRF rc-rfc. #388

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52 changes: 22 additions & 30 deletions oprf/oprf.go
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Expand Up @@ -50,7 +50,6 @@ import (
"crypto"
"encoding/binary"
"errors"
"fmt"
"hash"
"io"
"math"
Expand All @@ -60,7 +59,7 @@ import (
)

const (
version = "VOPRF10-"
version = "OPRFV1-"
finalizeDST = "Finalize"
hashToGroupDST = "HashToGroup-"
hashToScalarDST = "HashToScalar-"
Expand All @@ -81,37 +80,30 @@ func isValidMode(m Mode) bool {
}

type Suite interface {
ID() int
Identifier() string
Group() group.Group
Hash() crypto.Hash
Name() string
cannotBeImplementedExternally()
}

var (
// SuiteRistretto255 represents the OPRF with Ristretto255 and SHA-512
SuiteRistretto255 Suite = params{id: 1, group: group.Ristretto255, hash: crypto.SHA512, name: "OPRF(ristretto255, SHA-512)"}
SuiteRistretto255 Suite = params{identifier: "ristretto255-SHA512", group: group.Ristretto255, hash: crypto.SHA512}
// SuiteP256 represents the OPRF with P-256 and SHA-256.
SuiteP256 Suite = params{id: 3, group: group.P256, hash: crypto.SHA256, name: "OPRF(P-256, SHA-256)"}
SuiteP256 Suite = params{identifier: "P256-SHA256", group: group.P256, hash: crypto.SHA256}
// SuiteP384 represents the OPRF with P-384 and SHA-384.
SuiteP384 Suite = params{id: 4, group: group.P384, hash: crypto.SHA384, name: "OPRF(P-384, SHA-384)"}
SuiteP384 Suite = params{identifier: "P384-SHA384", group: group.P384, hash: crypto.SHA384}
// SuiteP521 represents the OPRF with P-521 and SHA-512.
SuiteP521 Suite = params{id: 5, group: group.P521, hash: crypto.SHA512, name: "OPRF(P-521, SHA-512)"}
SuiteP521 Suite = params{identifier: "P521-SHA512", group: group.P521, hash: crypto.SHA512}
)

func GetSuite(id int) (Suite, error) {
switch uint16(id) {
case SuiteRistretto255.(params).id:
return SuiteRistretto255, nil
case SuiteP256.(params).id:
return SuiteP256, nil
case SuiteP384.(params).id:
return SuiteP384, nil
case SuiteP521.(params).id:
return SuiteP521, nil
default:
return nil, ErrInvalidSuite
func GetSuite(identifier string) (Suite, error) {
for _, suite := range []Suite{SuiteRistretto255, SuiteP256, SuiteP384, SuiteP521} {
if suite.Identifier() == identifier {
return suite, nil
}
}
return nil, ErrInvalidSuite
}

func NewClient(s Suite) Client {
Expand Down Expand Up @@ -172,26 +164,26 @@ func NewPartialObliviousServer(s Suite, key *PrivateKey) PartialObliviousServer
}

type params struct {
id uint16
m Mode
group group.Group
hash crypto.Hash
name string
m Mode
group group.Group
hash crypto.Hash
identifier string
}

func (p params) cannotBeImplementedExternally() {}

func (p params) String() string { return fmt.Sprintf("Suite%v", p.group) }
func (p params) ID() int { return int(p.id) }
func (p params) String() string { return p.Identifier() }
func (p params) Group() group.Group { return p.group }
func (p params) Hash() crypto.Hash { return p.hash }
func (p params) Name() string { return p.name }
func (p params) Identifier() string { return p.identifier }

func (p params) getDST(name string) []byte {
return append(append(append([]byte{},
return append(append(append(append(
[]byte{},
[]byte(name)...),
[]byte(version)...),
[]byte{p.m, 0, byte(p.id)}...)
[]byte{p.m, byte('-')}...),
[]byte(p.identifier)...)
}

func (p params) scalarFromInfo(info []byte) (group.Scalar, error) {
Expand Down
6 changes: 3 additions & 3 deletions oprf/oprf_test.go
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Expand Up @@ -285,19 +285,19 @@ func BenchmarkAPI(b *testing.B) {
key, err := GenerateKey(suite, rand.Reader)
test.CheckNoErr(b, err, "failed key generation")

b.Run("OPRF/"+suite.Name(), func(b *testing.B) {
b.Run("OPRF/"+suite.Identifier(), func(b *testing.B) {
s := NewServer(suite, key)
c := NewClient(suite)
benchAPI(b, s, c)
})

b.Run("VOPRF/"+suite.Name(), func(b *testing.B) {
b.Run("VOPRF/"+suite.Identifier(), func(b *testing.B) {
s := NewVerifiableServer(suite, key)
c := NewVerifiableClient(suite, s.PublicKey())
benchAPI(b, s, c)
})

b.Run("POPRF/"+suite.Name(), func(b *testing.B) {
b.Run("POPRF/"+suite.Identifier(), func(b *testing.B) {
info := []byte("shared info")
s := &s1{NewPartialObliviousServer(suite, key), info}
c := &c1{NewPartialObliviousClient(suite, s.PublicKey()), info}
Expand Down