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// Copyright (c) 2020, Google Inc.
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
package subprocess
import (
"bytes"
"encoding/hex"
"encoding/json"
"fmt"
)
type kasVectorSet struct {
Groups []kasTestGroup `json:"testGroups"`
}
type kasTestGroup struct {
ID uint64 `json:"tgId"`
Type string `json:"testType"`
Curve string `json:"domainParameterGenerationMode"`
Role string `json:"kasRole"`
Scheme string `json:"scheme"`
Tests []kasTest `json:"tests"`
}
type kasTest struct {
ID uint64 `json:"tcId"`
EphemeralXHex string `json:"ephemeralPublicServerX"`
EphemeralYHex string `json:"ephemeralPublicServerY"`
EphemeralPrivateKeyHex string `json:"ephemeralPrivateIut"`
StaticXHex string `json:"staticPublicServerX"`
StaticYHex string `json:"staticPublicServerY"`
StaticPrivateKeyHex string `json:"staticPrivateIut"`
ResultHex string `json:"z"`
}
type kasTestGroupResponse struct {
ID uint64 `json:"tgId"`
Tests []kasTestResponse `json:"tests"`
}
type kasTestResponse struct {
ID uint64 `json:"tcId"`
EphemeralXHex string `json:"ephemeralPublicIutX,omitempty"`
EphemeralYHex string `json:"ephemeralPublicIutY,omitempty"`
StaticXHex string `json:"staticPublicIutX,omitempty"`
StaticYHex string `json:"staticPublicIutY,omitempty"`
ResultHex string `json:"z,omitempty"`
Passed *bool `json:"testPassed,omitempty"`
}
type kas struct{}
func (k *kas) Process(vectorSet []byte, m Transactable) (interface{}, error) {
var parsed kasVectorSet
if err := json.Unmarshal(vectorSet, &parsed); err != nil {
return nil, err
}
// See https://pages.nist.gov/ACVP/draft-fussell-acvp-kas-ecc.html#name-test-vectors
var ret []kasTestGroupResponse
for _, group := range parsed.Groups {
response := kasTestGroupResponse{
ID: group.ID,
}
var privateKeyGiven bool
switch group.Type {
case "AFT":
privateKeyGiven = false
case "VAL":
privateKeyGiven = true
default:
return nil, fmt.Errorf("unknown test type %q", group.Type)
}
switch group.Curve {
case "P-224", "P-256", "P-384", "P-521":
break
default:
return nil, fmt.Errorf("unknown curve %q", group.Curve)
}
switch group.Role {
case "initiator", "responder":
break
default:
return nil, fmt.Errorf("unknown role %q", group.Role)
}
var useStaticNamedFields bool
switch group.Scheme {
case "ephemeralUnified":
break
case "staticUnified":
useStaticNamedFields = true
break
default:
return nil, fmt.Errorf("unknown scheme %q", group.Scheme)
}
method := "ECDH/" + group.Curve
for _, test := range group.Tests {
var xHex, yHex, privateKeyHex string
if useStaticNamedFields {
xHex, yHex, privateKeyHex = test.StaticXHex, test.StaticYHex, test.StaticPrivateKeyHex
} else {
xHex, yHex, privateKeyHex = test.EphemeralXHex, test.EphemeralYHex, test.EphemeralPrivateKeyHex
}
if len(xHex) == 0 || len(yHex) == 0 {
return nil, fmt.Errorf("%d/%d is missing peer's point", group.ID, test.ID)
}
peerX, err := hex.DecodeString(xHex)
if err != nil {
return nil, err
}
peerY, err := hex.DecodeString(yHex)
if err != nil {
return nil, err
}
if (len(privateKeyHex) != 0) != privateKeyGiven {
return nil, fmt.Errorf("%d/%d incorrect private key presence", group.ID, test.ID)
}
if privateKeyGiven {
privateKey, err := hex.DecodeString(privateKeyHex)
if err != nil {
return nil, err
}
expectedOutput, err := hex.DecodeString(test.ResultHex)
if err != nil {
return nil, err
}
result, err := m.Transact(method, 3, peerX, peerY, privateKey)
if err != nil {
return nil, err
}
ok := bytes.Equal(result[2], expectedOutput)
response.Tests = append(response.Tests, kasTestResponse{
ID: test.ID,
Passed: &ok,
})
} else {
result, err := m.Transact(method, 3, peerX, peerY, nil)
if err != nil {
return nil, err
}
testResponse := kasTestResponse{
ID: test.ID,
ResultHex: hex.EncodeToString(result[2]),
}
if useStaticNamedFields {
testResponse.StaticXHex = hex.EncodeToString(result[0])
testResponse.StaticYHex = hex.EncodeToString(result[1])
} else {
testResponse.EphemeralXHex = hex.EncodeToString(result[0])
testResponse.EphemeralYHex = hex.EncodeToString(result[1])
}
response.Tests = append(response.Tests, testResponse)
}
}
ret = append(ret, response)
}
return ret, nil
}