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// Copyright 2020 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package wycheproof
import (
"crypto/hmac"
"testing"
)
func TestHMAC(t *testing.T) {
// MacTestVector
type MacTestVector struct {
// A brief description of the test case
Comment string `json:"comment,omitempty"`
// A list of flags
Flags []string `json:"flags,omitempty"`
// the key
Key string `json:"key,omitempty"`
// the plaintext
Msg string `json:"msg,omitempty"`
// Test result
Result string `json:"result,omitempty"`
// the authentication tag
Tag string `json:"tag,omitempty"`
// Identifier of the test case
TcId int `json:"tcId,omitempty"`
}
// MacTestGroup
type MacTestGroup struct {
// the keySize in bits
KeySize int `json:"keySize,omitempty"`
// the expected size of the tag in bits
TagSize int `json:"tagSize,omitempty"`
Tests []*MacTestVector `json:"tests,omitempty"`
Type interface{} `json:"type,omitempty"`
}
// Notes a description of the labels used in the test vectors
type Notes struct {
}
// Root
type Root struct {
// the primitive tested in the test file
Algorithm string `json:"algorithm,omitempty"`
// the version of the test vectors.
GeneratorVersion string `json:"generatorVersion,omitempty"`
// additional documentation
Header []string `json:"header,omitempty"`
// a description of the labels used in the test vectors
Notes *Notes `json:"notes,omitempty"`
// the number of test vectors in this test
NumberOfTests int `json:"numberOfTests,omitempty"`
Schema interface{} `json:"schema,omitempty"`
TestGroups []*MacTestGroup `json:"testGroups,omitempty"`
}
fileHashAlgs := map[string]string{
"hmac_sha1_test.json": "SHA-1",
"hmac_sha224_test.json": "SHA-224",
"hmac_sha256_test.json": "SHA-256",
"hmac_sha384_test.json": "SHA-384",
"hmac_sha512_test.json": "SHA-512",
}
for f := range fileHashAlgs {
var root Root
readTestVector(t, f, &root)
for _, tg := range root.TestGroups {
h := parseHash(fileHashAlgs[f])
// Skip test vectors where the tag length does not equal the
// hash length, since crypto/hmac does not support generating
// these truncated tags.
if tg.TagSize/8 != h.Size() {
continue
}
for _, tv := range tg.Tests {
hm := hmac.New(h.New, decodeHex(tv.Key))
hm.Write(decodeHex(tv.Msg))
tag := hm.Sum(nil)
got := hmac.Equal(decodeHex(tv.Tag), tag)
if want := shouldPass(tv.Result, tv.Flags, nil); want != got {
t.Errorf("%s, tcid: %d, type: %s, comment: %q, unexpected result", f, tv.TcId, tv.Result, tv.Comment)
}
}
}
}
}
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