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// Copyright (c) 2019, 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 (
"encoding/hex"
"encoding/json"
"fmt"
)
// The following structures reflect the JSON of ACVP hash tests. See
// https://pages.nist.gov/ACVP/draft-celi-acvp-sha.html#name-test-vectors
type hashTestVectorSet struct {
Groups []hashTestGroup `json:"testGroups"`
}
type hashTestGroup struct {
ID uint64 `json:"tgId"`
Type string `json:"testType"`
Tests []struct {
ID uint64 `json:"tcId"`
BitLength uint64 `json:"len"`
MsgHex string `json:"msg"`
} `json:"tests"`
}
type hashTestGroupResponse struct {
ID uint64 `json:"tgId"`
Tests []hashTestResponse `json:"tests"`
}
type hashTestResponse struct {
ID uint64 `json:"tcId"`
DigestHex string `json:"md,omitempty"`
MCTResults []hashMCTResult `json:"resultsArray,omitempty"`
}
type hashMCTResult struct {
DigestHex string `json:"md"`
}
// hashPrimitive implements an ACVP algorithm by making requests to the
// subprocess to hash strings.
type hashPrimitive struct {
// algo is the ACVP name for this algorithm and also the command name
// given to the subprocess to hash with this hash function.
algo string
// size is the number of bytes of digest that the hash produces.
size int
}
func (h *hashPrimitive) Process(vectorSet []byte, m Transactable) (interface{}, error) {
var parsed hashTestVectorSet
if err := json.Unmarshal(vectorSet, &parsed); err != nil {
return nil, err
}
var ret []hashTestGroupResponse
// See
// https://pages.nist.gov/ACVP/draft-celi-acvp-sha.html#name-test-vectors
// for details about the tests.
for _, group := range parsed.Groups {
response := hashTestGroupResponse{
ID: group.ID,
}
for _, test := range group.Tests {
if uint64(len(test.MsgHex))*4 != test.BitLength {
return nil, fmt.Errorf("test case %d/%d contains hex message of length %d but specifies a bit length of %d", group.ID, test.ID, len(test.MsgHex), test.BitLength)
}
msg, err := hex.DecodeString(test.MsgHex)
if err != nil {
return nil, fmt.Errorf("failed to decode hex in test case %d/%d: %s", group.ID, test.ID, err)
}
// http://usnistgov.github.io/ACVP/artifacts/draft-celi-acvp-sha-00.html#rfc.section.3
switch group.Type {
case "AFT":
result, err := m.Transact(h.algo, 1, msg)
if err != nil {
panic(h.algo + " hash operation failed: " + err.Error())
}
response.Tests = append(response.Tests, hashTestResponse{
ID: test.ID,
DigestHex: hex.EncodeToString(result[0]),
})
case "MCT":
if len(msg) != h.size {
return nil, fmt.Errorf("MCT test case %d/%d contains message of length %d but the digest length is %d", group.ID, test.ID, len(msg), h.size)
}
testResponse := hashTestResponse{ID: test.ID}
digest := msg
for i := 0; i < 100; i++ {
result, err := m.Transact(h.algo+"/MCT", 1, digest)
if err != nil {
panic(h.algo + " hash operation failed: " + err.Error())
}
digest = result[0]
testResponse.MCTResults = append(testResponse.MCTResults, hashMCTResult{hex.EncodeToString(digest)})
}
response.Tests = append(response.Tests, testResponse)
default:
return nil, fmt.Errorf("test group %d has unknown type %q", group.ID, group.Type)
}
}
ret = append(ret, response)
}
return ret, nil
}