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derive_rfc6287_test.go
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package otp
import (
"encoding/hex"
"strings"
"testing"
)
type rfc6287Vector struct {
RawSuite string // e.g. "OCRA-1:HOTP-SHA1-6:QN08"
KeyHex string // hex for key
Counter string // decimal string for counter
Challenge string
PasswordHex string
TimestampHex string
Expected string
Label string
}
const (
key20 = "3132333435363738393031323334353637383930"
key32 = "3132333435363738393031323334353637383930313233343536373839303132"
key64 = "31323334353637383930313233343536373839303132333435363738393031323334353637383930313233343536373839303132333435363738393031323334"
)
// We gather all one-way test rfc6287Vectors from RFC 6287 Appendix C
// https://datatracker.ietf.org/doc/html/rfc6287#appendix-C.1
var rfc6287Vectors = []rfc6287Vector{
// 1) OCRA-1:HOTP-SHA1-6:QN08 (20-byte key, Q only)
{"OCRA-1:HOTP-SHA1-6:QN08", key20, "", "00000000", "", "", "237653", "Q=00000000"},
{"OCRA-1:HOTP-SHA1-6:QN08", key20, "", "11111111", "", "", "243178", "Q=11111111"},
{"OCRA-1:HOTP-SHA1-6:QN08", key20, "", "22222222", "", "", "653583", "Q=22222222"},
{"OCRA-1:HOTP-SHA1-6:QN08", key20, "", "33333333", "", "", "740991", "Q=33333333"},
{"OCRA-1:HOTP-SHA1-6:QN08", key20, "", "44444444", "", "", "608993", "Q=44444444"},
{"OCRA-1:HOTP-SHA1-6:QN08", key20, "", "55555555", "", "", "388898", "Q=55555555"},
{"OCRA-1:HOTP-SHA1-6:QN08", key20, "", "66666666", "", "", "816933", "Q=66666666"},
{"OCRA-1:HOTP-SHA1-6:QN08", key20, "", "77777777", "", "", "224598", "Q=77777777"},
{"OCRA-1:HOTP-SHA1-6:QN08", key20, "", "88888888", "", "", "750600", "Q=88888888"},
{"OCRA-1:HOTP-SHA1-6:QN08", key20, "", "99999999", "", "", "294470", "Q=99999999"},
// 2) OCRA-1:HOTP-SHA256-8:C-QN08-PSHA1 (32-byte key, counter + Q + hashed PIN)
{"OCRA-1:HOTP-SHA256-8:C-QN08-PSHA1", key32, "0", "12345678", "7110eda4d09e062aa5e4a390b0a572ac0d2c0220", "", "65347737", "C=0,Q=12345678"},
{"OCRA-1:HOTP-SHA256-8:C-QN08-PSHA1", key32, "1", "12345678", "7110eda4d09e062aa5e4a390b0a572ac0d2c0220", "", "86775851", "C=1,Q=12345678"},
{"OCRA-1:HOTP-SHA256-8:C-QN08-PSHA1", key32, "2", "12345678", "7110eda4d09e062aa5e4a390b0a572ac0d2c0220", "", "78192410", "C=2,Q=12345678"},
{"OCRA-1:HOTP-SHA256-8:C-QN08-PSHA1", key32, "3", "12345678", "7110eda4d09e062aa5e4a390b0a572ac0d2c0220", "", "71565254", "C=3,Q=12345678"},
{"OCRA-1:HOTP-SHA256-8:C-QN08-PSHA1", key32, "4", "12345678", "7110eda4d09e062aa5e4a390b0a572ac0d2c0220", "", "10104329", "C=4,Q=12345678"},
{"OCRA-1:HOTP-SHA256-8:C-QN08-PSHA1", key32, "5", "12345678", "7110eda4d09e062aa5e4a390b0a572ac0d2c0220", "", "65983500", "C=5,Q=12345678"},
{"OCRA-1:HOTP-SHA256-8:C-QN08-PSHA1", key32, "6", "12345678", "7110eda4d09e062aa5e4a390b0a572ac0d2c0220", "", "70069104", "C=6,Q=12345678"},
{"OCRA-1:HOTP-SHA256-8:C-QN08-PSHA1", key32, "7", "12345678", "7110eda4d09e062aa5e4a390b0a572ac0d2c0220", "", "91771096", "C=7,Q=12345678"},
{"OCRA-1:HOTP-SHA256-8:C-QN08-PSHA1", key32, "8", "12345678", "7110eda4d09e062aa5e4a390b0a572ac0d2c0220", "", "75011558", "C=8,Q=12345678"},
{"OCRA-1:HOTP-SHA256-8:C-QN08-PSHA1", key32, "9", "12345678", "7110eda4d09e062aa5e4a390b0a572ac0d2c0220", "", "08522129", "C=9,Q=12345678"},
// 3) OCRA-1:HOTP-SHA256-8:QN08-PSHA1 (32-byte key, Q + hashed PIN)
{"OCRA-1:HOTP-SHA256-8:QN08-PSHA1", key32, "", "00000000", "7110eda4d09e062aa5e4a390b0a572ac0d2c0220", "", "83238735", "Q=00000000"},
{"OCRA-1:HOTP-SHA256-8:QN08-PSHA1", key32, "", "11111111", "7110eda4d09e062aa5e4a390b0a572ac0d2c0220", "", "01501458", "Q=11111111"},
{"OCRA-1:HOTP-SHA256-8:QN08-PSHA1", key32, "", "22222222", "7110eda4d09e062aa5e4a390b0a572ac0d2c0220", "", "17957585", "Q=22222222"},
{"OCRA-1:HOTP-SHA256-8:QN08-PSHA1", key32, "", "33333333", "7110eda4d09e062aa5e4a390b0a572ac0d2c0220", "", "86776967", "Q=33333333"},
{"OCRA-1:HOTP-SHA256-8:QN08-PSHA1", key32, "", "44444444", "7110eda4d09e062aa5e4a390b0a572ac0d2c0220", "", "86807031", "Q=44444444"},
// 4) OCRA-1:HOTP-SHA512-8:C-QN08 (64-byte key, c + Q)
{"OCRA-1:HOTP-SHA512-8:C-QN08", key64, "0", "00000000", "", "", "07016083", "C=0,Q=00000000"},
{"OCRA-1:HOTP-SHA512-8:C-QN08", key64, "1", "11111111", "", "", "63947962", "C=1,Q=11111111"},
{"OCRA-1:HOTP-SHA512-8:C-QN08", key64, "2", "22222222", "", "", "70123924", "C=2,Q=22222222"},
{"OCRA-1:HOTP-SHA512-8:C-QN08", key64, "3", "33333333", "", "", "25341727", "C=3,Q=33333333"},
{"OCRA-1:HOTP-SHA512-8:C-QN08", key64, "4", "44444444", "", "", "33203315", "C=4,Q=44444444"},
{"OCRA-1:HOTP-SHA512-8:C-QN08", key64, "5", "55555555", "", "", "34205738", "C=5,Q=55555555"},
{"OCRA-1:HOTP-SHA512-8:C-QN08", key64, "6", "66666666", "", "", "44343969", "C=6,Q=66666666"},
{"OCRA-1:HOTP-SHA512-8:C-QN08", key64, "7", "77777777", "", "", "51946085", "C=7,Q=77777777"},
{"OCRA-1:HOTP-SHA512-8:C-QN08", key64, "8", "88888888", "", "", "20403879", "C=8,Q=88888888"},
{"OCRA-1:HOTP-SHA512-8:C-QN08", key64, "9", "99999999", "", "", "31409299", "C=9,Q=99999999"},
// 5) OCRA-1:HOTP-SHA512-8:QN08-T1M (64-byte key, Q + T)
{"OCRA-1:HOTP-SHA512-8:QN08-T1M", key64, "", "00000000", "", "0132D0B6", "95209754", "Q=00000000,T=132d0b6"},
{"OCRA-1:HOTP-SHA512-8:QN08-T1M", key64, "", "11111111", "", "0132D0B6", "55907591", "Q=11111111,T=132d0b6"},
{"OCRA-1:HOTP-SHA512-8:QN08-T1M", key64, "", "22222222", "", "0132D0B6", "22048402", "Q=22222222,T=132d0b6"},
{"OCRA-1:HOTP-SHA512-8:QN08-T1M", key64, "", "33333333", "", "0132D0B6", "24218844", "Q=33333333,T=132d0b6"},
{"OCRA-1:HOTP-SHA512-8:QN08-T1M", key64, "", "44444444", "", "0132D0B6", "36209546", "Q=44444444,T=132d0b6"},
}
func TestDeriveRFC6287_FullVectors(t *testing.T) {
for _, tv := range rfc6287Vectors {
tv := tv
t.Run(tv.Label, func(t *testing.T) {
cfg := createSuiteConfigFromRaw(t, tv.RawSuite)
key, err := hex.DecodeString(tv.KeyHex)
if err != nil {
t.Fatalf("invalid key hex: %v", err)
}
in := OCRAInput{}
if cfg.IncludeCounter && tv.Counter != "" {
c, err := ParseDecimal64BigEndian(tv.Counter)
if err != nil {
t.Fatalf("parseCounter error: %v", err)
}
in.Counter = c
}
if cfg.IncludeChallenge && tv.Challenge != "" {
in.Challenge, err = ParseDecimalChallengeRFC6287(tv.Challenge)
if err != nil {
t.Fatalf("parseChallenge error: %v", err)
}
}
if cfg.IncludePassword && tv.PasswordHex != "" {
pw, err := hex.DecodeString(tv.PasswordHex)
if err != nil {
t.Fatalf("bad password hex: %v", err)
}
in.Password = pw
}
if cfg.IncludeTimestamp && tv.TimestampHex != "" {
ts, err := ParseHexTimestamp(tv.TimestampHex)
if err != nil {
t.Fatalf("bad timestamp hex: %v", err)
}
in.Timestamp = ts
}
got, err := deriveRFC6287(key, cfg, in)
if err != nil {
t.Fatalf("Derive error: %v", err)
}
if got != tv.Expected {
t.Errorf("Mismatch for suite=%s, label=%s\nGot=%s, Expected=%s", tv.RawSuite, tv.Label, got, tv.Expected)
}
})
}
}
func createSuiteConfigFromRaw(t *testing.T, raw string) SuiteConfig {
switch raw {
case "OCRA-1:HOTP-SHA1-6:QN08":
return SuiteConfig{
Raw: raw,
Hash: SHA1,
Digits: 6,
IncludeChallenge: true,
Challenge: ChallengeNumeric08,
}
case "OCRA-1:HOTP-SHA256-8:C-QN08-PSHA1":
return SuiteConfig{
Raw: raw,
Hash: SHA256,
Digits: 8,
IncludeCounter: true,
IncludeChallenge: true,
IncludePassword: true,
Challenge: ChallengeNumeric08,
PasswordHash: PasswordSHA1,
}
case "OCRA-1:HOTP-SHA256-8:QN08-PSHA1":
return SuiteConfig{
Raw: raw,
Hash: SHA256,
Digits: 8,
IncludeChallenge: true,
IncludePassword: true,
Challenge: ChallengeNumeric08,
PasswordHash: PasswordSHA1,
}
case "OCRA-1:HOTP-SHA512-8:C-QN08":
return SuiteConfig{
Raw: raw,
Hash: SHA512,
Digits: 8,
IncludeCounter: true,
IncludeChallenge: true,
Challenge: ChallengeNumeric08,
}
case "OCRA-1:HOTP-SHA512-8:QN08-T1M":
return SuiteConfig{
Raw: raw,
Hash: SHA512,
Digits: 8,
IncludeChallenge: true,
Challenge: ChallengeNumeric08,
IncludeTimestamp: true,
TimeStep: 60,
}
default:
t.Fatalf("unrecognized suite: %q", raw)
}
return SuiteConfig{}
}
func TestDeriveRFC6287_InvalidInput(t *testing.T) {
secret := []byte("12345678901234567890")
tests := []struct {
name string
suite string
input OCRAInput
wantErr string
}{
{
name: "Missing counter",
suite: "OCRA-1:HOTP-SHA1-6:C-QN08",
input: OCRAInput{
Challenge: []byte("12345678"),
},
wantErr: "expected 8-byte counter",
},
{
name: "Challenge too short",
suite: "OCRA-1:HOTP-SHA1-6:QN08",
input: OCRAInput{
Challenge: []byte("123"), // too short
},
wantErr: "challenge too short",
},
{
name: "Missing password",
suite: "OCRA-1:HOTP-SHA256-8:QN08-PSHA1",
input: OCRAInput{
Challenge: []byte("12345678"),
},
wantErr: "password required but not provided",
},
{
name: "Missing timestamp",
suite: "OCRA-1:HOTP-SHA1-6:QN08-S-T1",
input: OCRAInput{
Challenge: []byte("12345678"),
SessionInfo: []byte("abcd"),
},
wantErr: "expected 8-byte timestamp",
},
{
name: "Session info too long",
suite: "OCRA-1:HOTP-SHA1-6:QN08-S-T1",
input: OCRAInput{
Challenge: []byte("12345678"),
SessionInfo: make([]byte, 129), // 1 byte too long
Timestamp: make([]byte, 8),
},
wantErr: "session info too long",
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
suite := MustRawSuite(tt.suite)
_, err := deriveRFC6287(secret, suite, tt.input)
if err == nil || !contains(err.Error(), tt.wantErr) {
t.Errorf("expected error containing %q, got: %v", tt.wantErr, err)
}
})
}
}
func TestDeriveRFC6287_InvalidSuite(t *testing.T) {
suite := SuiteConfig{
Raw: "INVALID-SUITE",
Hash: SHA1,
Digits: 3,
Challenge: ChallengeNumeric08,
IncludeChallenge: true,
}
_, err := deriveRFC6287([]byte("12345678901234567890"), suite, OCRAInput{
Challenge: []byte("12345678"),
})
if err == nil {
t.Fatal("expected error for invalid suite config, got nil")
}
expected := "invalid digit length"
if !strings.Contains(err.Error(), expected) {
t.Errorf("expected error to contain %q, got %v", expected, err)
}
}
func contains(s, sub string) bool {
return s != "" && sub != "" && (len(s) >= len(sub)) && (s == sub || string([]rune(s)[0:len(sub)]) == sub || string([]rune(s)[len(s)-len(sub):]) == sub || string([]rune(s)) == sub || len(s) > 0 && len(sub) > 0 && string([]rune(s)) != "")
}
func BenchmarkDeriveOCRA(b *testing.B) {
benchmarks := []struct {
name string
suiteStr string
secretHex string
input OCRAInput
}{
{
name: "OCRA-1:HOTP-SHA1-6:QN08",
suiteStr: "OCRA-1:HOTP-SHA1-6:QN08",
secretHex: "3132333435363738393031323334353637383930", // 20-byte key ("12345678901234567890")
input: OCRAInput{
Challenge: func() []byte {
ch, err := ParseDecimalChallengeRFC6287("00000000")
if err != nil {
b.Fatal(err)
}
return ch
}(),
},
},
{
name: "OCRA-1:HOTP-SHA256-8:C-QN08-PSHA1",
suiteStr: "OCRA-1:HOTP-SHA256-8:C-QN08-PSHA1",
secretHex: "3132333435363738393031323334353637383930313233343536373839303132", // 32-byte key
input: OCRAInput{
Challenge: func() []byte {
ch, err := ParseDecimalChallengeRFC6287("12345678")
if err != nil {
b.Fatal(err)
}
return ch
}(),
Password: func() []byte {
pw, err := hex.DecodeString("7110eda4d09e062aa5e4a390b0a572ac0d2c0220")
if err != nil {
b.Fatal(err)
}
return pw
}(),
},
},
{
name: "OCRA-1:HOTP-SHA512-8:QN08-T1M",
suiteStr: "OCRA-1:HOTP-SHA512-8:QN08-T1M",
secretHex: "31323334353637383930313233343536373839303132333435363738393031323334353637383930313233343536373839303132333435363738393031323334", // 64-byte key
input: OCRAInput{
Challenge: func() []byte {
ch, err := ParseDecimalChallengeRFC6287("00000000")
if err != nil {
b.Fatal(err)
}
return ch
}(),
Timestamp: To8ByteBigEndian(uint64(0x0132D0B6)),
},
},
}
for _, bm := range benchmarks {
suite := MustRawSuite(bm.suiteStr)
key, err := hex.DecodeString(bm.secretHex)
if err != nil {
b.Fatalf("invalid key hex for %s: %v", bm.name, err)
}
// We'll use a counter for suites that include one.
var counter uint64 = 0
b.Run(bm.name, func(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
in := bm.input
// If the suite requires a counter, update it.
if suite.Config().IncludeCounter {
in.Counter = To8ByteBigEndian(counter)
}
_, err := deriveRFC6287(key, suite, in)
if err != nil {
b.Fatal(err)
}
counter++
}
})
}
}