feat(QMCv2): replace with old decoder
MengYX
3 years ago
parent
7755d47f7a
commit
deaa58e91f
@ -1,70 +0,0 @@
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package qmc
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var oggPublicHeader1 = []byte{
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0x4f, 0x67, 0x67, 0x53, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff,
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0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x01, 0x1e, 0x01, 0x76, 0x6f, 0x72,
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0x62, 0x69, 0x73, 0x00, 0x00, 0x00, 0x00, 0x02, 0x44, 0xac, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0xee, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0xb8, 0x01, 0x4f, 0x67, 0x67, 0x53, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x01, 0x00, 0x00, 0x00,
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0xff, 0xff, 0xff, 0xff}
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var oggPublicHeader2 = []byte{
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0x03, 0x76, 0x6f, 0x72, 0x62, 0x69, 0x73, 0x2c, 0x00, 0x00, 0x00, 0x58, 0x69, 0x70, 0x68, 0x2e,
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0x4f, 0x72, 0x67, 0x20, 0x6c, 0x69, 0x62, 0x56, 0x6f, 0x72, 0x62, 0x69, 0x73, 0x20, 0x49, 0x20,
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0x32, 0x30, 0x31, 0x35, 0x30, 0x31, 0x30, 0x35, 0x20, 0x28, 0xe2, 0x9b, 0x84, 0xe2, 0x9b, 0x84,
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0xe2, 0x9b, 0x84, 0xe2, 0x9b, 0x84, 0x29, 0xff, 0x00, 0x00, 0x00, 0xff, 0x00, 0x00, 0x00, 0x54,
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0x49, 0x54, 0x4c, 0x45, 0x3d}
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var oggPublicConfidence1 = []uint{
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9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 0, 0,
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0, 0, 9, 9, 9, 9, 0, 0, 0, 0, 9, 9, 9, 9, 9, 9,
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9, 9, 9, 9, 9, 9, 9, 6, 3, 3, 3, 3, 6, 6, 6, 6,
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3, 3, 3, 3, 6, 6, 6, 6, 6, 9, 9, 9, 9, 9, 9, 9,
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9, 9, 9, 9, 9, 9, 9, 9, 0, 0, 0, 0, 9, 9, 9, 9,
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0, 0, 0, 0}
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var oggPublicConfidence2 = []uint{
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3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
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3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
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3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
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3, 3, 3, 3, 3, 3, 3, 0, 1, 3, 3, 0, 1, 3, 3, 3,
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3, 3, 3, 3, 3}
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var (
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defaultKey256Mask44 = []byte{
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0xde, 0x51, 0xfa, 0xc3, 0x4a, 0xd6, 0xca, 0x90,
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0x7e, 0x67, 0x5e, 0xf7, 0xd5, 0x52, 0x84, 0xd8,
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0x47, 0x95, 0xbb, 0xa1, 0xaa, 0xc6, 0x66, 0x23,
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0x92, 0x62, 0xf3, 0x74, 0xa1, 0x9f, 0xf4, 0xa0,
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0x1d, 0x3f, 0x5b, 0xf0, 0x13, 0x0e, 0x09, 0x3d,
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0xf9, 0xbc, 0x00, 0x11}
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)
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var key256MappingAll [][]int //[idx256][idx128]idx44
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var key256Mapping128to44 map[int]int
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func init() {
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{ // init all mapping
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key256MappingAll = make([][]int, 256)
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for i := 0; i < 128; i++ {
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realIdx := (i*i + 27) % 256
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if key256MappingAll[realIdx] == nil {
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key256MappingAll[realIdx] = []int{i}
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} else {
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key256MappingAll[realIdx] = append(key256MappingAll[realIdx], i)
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}
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}
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}
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{ // init
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key256Mapping128to44 = make(map[int]int, 128)
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idx44 := 0
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for _, all128 := range key256MappingAll {
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if all128 != nil {
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for _, _i128 := range all128 {
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key256Mapping128to44[_i128] = idx44
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}
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idx44++
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}
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}
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}
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}
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@ -1,212 +0,0 @@
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package qmc
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import (
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"bytes"
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"errors"
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"github.com/unlock-music/cli/algo/common"
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"github.com/unlock-music/cli/internal/logging"
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"go.uber.org/zap"
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)
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var (
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ErrFailToMatchMask = errors.New("can not match at least one key")
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ErrTestDataLength = errors.New("invalid length of test file")
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ErrMaskLength128 = errors.New("incorrect mask length 128")
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ErrMaskLength44 = errors.New("incorrect mask length 44")
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ErrMaskDecode = errors.New("decode mask-128 to mask-58 failed")
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ErrDetectFlacMask = errors.New("can not detect mflac mask")
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ErrDetectMggMask = errors.New("can not detect mgg mask")
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)
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type Key256Mask struct {
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matrix []byte // Mask 128
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}
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func NewKey256FromMask128(mask128 []byte) (*Key256Mask, error) {
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if len(mask128) != 128 {
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return nil, ErrMaskLength128
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}
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q := &Key256Mask{matrix: mask128}
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return q, nil
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}
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func NewKey256FromMask44(mask44 []byte) (*Key256Mask, error) {
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mask128, err := convertKey256Mask44to128(mask44)
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if err != nil {
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return nil, err
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}
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q := &Key256Mask{matrix: mask128}
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return q, nil
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}
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func (q *Key256Mask) GetMatrix44() ([]byte, error) {
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if len(q.matrix) != 128 {
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return nil, ErrMaskLength128
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}
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matrix44 := make([]byte, 44)
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idx44 := 0
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for _, it256 := range key256MappingAll {
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if it256 != nil {
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it256Len := len(it256)
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for i := 1; i < it256Len; i++ {
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if q.matrix[it256[0]] != q.matrix[it256[i]] {
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return nil, ErrMaskDecode
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}
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}
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matrix44[idx44] = q.matrix[it256[0]]
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idx44++
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}
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}
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return matrix44, nil
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}
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func (q *Key256Mask) Decrypt(data []byte) []byte {
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dst := make([]byte, len(data))
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index := -1
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maskIdx := -1
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for cur := 0; cur < len(data); cur++ {
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index++
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maskIdx++
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if index == 0x8000 || (index > 0x8000 && (index+1)%0x8000 == 0) {
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index++
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maskIdx++
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}
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if maskIdx >= 128 {
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maskIdx -= 128
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}
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dst[cur] = data[cur] ^ q.matrix[maskIdx]
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}
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return dst
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}
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func convertKey256Mask44to128(mask44 []byte) ([]byte, error) {
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if len(mask44) != 44 {
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return nil, ErrMaskLength44
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}
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mask128 := make([]byte, 128)
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idx44 := 0
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for _, it256 := range key256MappingAll {
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if it256 != nil {
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for _, idx128 := range it256 {
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mask128[idx128] = mask44[idx44]
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}
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idx44++
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}
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}
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return mask128, nil
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}
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func getDefaultMask() *Key256Mask {
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y, _ := NewKey256FromMask44(defaultKey256Mask44)
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return y
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}
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func detectMflac256Mask(input []byte) (*Key256Mask, error) {
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var q *Key256Mask
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var rtErr = ErrDetectFlacMask
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lenData := len(input)
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lenTest := 0x8000
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if lenData < 0x8000 {
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lenTest = lenData
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}
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for blockIdx := 0; blockIdx < lenTest; blockIdx += 128 {
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var err error
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q, err = NewKey256FromMask128(input[blockIdx : blockIdx+128])
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if err != nil {
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continue
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}
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if common.SnifferFLAC(q.Decrypt(input[:4])) {
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rtErr = nil
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break
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}
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}
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return q, rtErr
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}
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func detectMgg256Mask(input []byte) (*Key256Mask, error) {
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if len(input) < 0x100 {
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return nil, ErrTestDataLength
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}
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matrixConf := make([]map[uint8]uint, 44) //meaning: [idx58][value]confidence
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for i := uint(0); i < 44; i++ {
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matrixConf[i] = make(map[uint8]uint)
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}
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page2size := input[0x54] ^ input[0xC] ^ oggPublicHeader1[0xC]
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spHeader, spConf := generateOggFullHeader(int(page2size))
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lenTest := len(spHeader)
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for idx128 := 0; idx128 < lenTest; idx128++ {
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confidence := spConf[idx128]
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if confidence > 0 {
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mask := input[idx128] ^ spHeader[idx128]
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idx44 := key256Mapping128to44[idx128&0x7f] // equals: [idx128 % 128]
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if _, ok2 := matrixConf[idx44][mask]; ok2 {
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matrixConf[idx44][mask] += confidence
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} else {
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matrixConf[idx44][mask] = confidence
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}
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}
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}
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matrix := make([]uint8, 44)
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var err error
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for i := uint(0); i < 44; i++ {
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matrix[i], err = decideMgg256MaskItemConf(matrixConf[i])
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if err != nil {
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return nil, err
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}
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}
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q, err := NewKey256FromMask44(matrix)
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if err != nil {
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return nil, err
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}
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if common.SnifferOGG(q.Decrypt(input[:4])) {
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return q, nil
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}
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return nil, ErrDetectMggMask
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}
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func generateOggFullHeader(pageSize int) ([]byte, []uint) {
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spec := make([]byte, pageSize+1)
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spec[0], spec[1], spec[pageSize] = uint8(pageSize), 0xFF, 0xFF
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for i := 2; i < pageSize; i++ {
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spec[i] = 0xFF
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}
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specConf := make([]uint, pageSize+1)
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specConf[0], specConf[1], specConf[pageSize] = 6, 0, 0
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for i := 2; i < pageSize; i++ {
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specConf[i] = 4
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}
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allConf := append(oggPublicConfidence1, specConf...)
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allConf = append(allConf, oggPublicConfidence2...)
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allHeader := bytes.Join(
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[][]byte{oggPublicHeader1, spec, oggPublicHeader2},
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[]byte{},
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)
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return allHeader, allConf
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}
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func decideMgg256MaskItemConf(confidence map[uint8]uint) (uint8, error) {
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lenConf := len(confidence)
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if lenConf == 0 {
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return 0xff, ErrFailToMatchMask
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} else if lenConf > 1 {
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logging.Log().Warn("there are 2 potential value for the mask", zap.Any("confidence", confidence))
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}
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result := uint8(0)
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conf := uint(0)
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for idx, item := range confidence {
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if item > conf {
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result = idx
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conf = item
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}
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}
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return result, nil
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}
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@ -1,129 +0,0 @@
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package qmc
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import (
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"encoding/base64"
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"encoding/binary"
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"errors"
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"github.com/unlock-music/cli/algo/common"
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)
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var (
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ErrQmcFileLength = errors.New("invalid qmc file length")
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ErrQmcKeyDecodeFailed = errors.New("base64 decode qmc key failed")
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ErrQmcKeyLength = errors.New("unexpected decoded qmc key length")
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)
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type OldDecoder struct {
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file []byte
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maskDetector func(encodedData []byte) (*Key256Mask, error)
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mask *Key256Mask
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audioExt string
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key []byte
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audio []byte
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}
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func NewMflac256Decoder(data []byte) common.Decoder {
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return &OldDecoder{file: data, maskDetector: detectMflac256Mask, audioExt: "flac"}
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}
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func NewMgg256Decoder(data []byte) common.Decoder {
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return &OldDecoder{file: data, maskDetector: detectMgg256Mask, audioExt: "ogg"}
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}
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func (d *OldDecoder) Validate() error {
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if nil != d.mask {
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return nil
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}
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if nil != d.maskDetector {
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if err := d.validateKey(); err != nil {
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return err
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}
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var err error
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d.mask, err = d.maskDetector(d.file)
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return err
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}
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return errors.New("no mask or mask detector found")
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}
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func (d *OldDecoder) validateKey() error {
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lenData := len(d.file)
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if lenData < 4 {
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return ErrQmcFileLength
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}
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keyLen := binary.LittleEndian.Uint32(d.file[lenData-4:])
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if lenData < int(keyLen+4) {
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return ErrQmcFileLength
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}
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var err error
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d.key, err = base64.StdEncoding.DecodeString(
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string(d.file[lenData-4-int(keyLen) : lenData-4]))
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if err != nil {
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return ErrQmcKeyDecodeFailed
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}
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if len(d.key) != 272 {
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return ErrQmcKeyLength
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}
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d.file = d.file[:lenData-4-int(keyLen)]
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return nil
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}
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func (d *OldDecoder) Decode() error {
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d.audio = d.mask.Decrypt(d.file)
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return nil
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}
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func (d OldDecoder) GetCoverImage() []byte {
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return nil
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}
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func (d OldDecoder) GetAudioData() []byte {
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return d.audio
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}
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func (d OldDecoder) GetAudioExt() string {
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if d.audioExt != "" {
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return "." + d.audioExt
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}
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return ""
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}
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func (d OldDecoder) GetMeta() common.Meta {
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return nil
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}
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func DecoderFuncWithExt(ext string) common.NewDecoderFunc {
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return func(file []byte) common.Decoder {
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return &OldDecoder{file: file, audioExt: ext, mask: getDefaultMask()}
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}
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}
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//goland:noinspection SpellCheckingInspection
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func init() {
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common.RegisterDecoder("qmc0", false, DecoderFuncWithExt("mp3")) //QQ Music Mp3
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common.RegisterDecoder("qmc3", false, DecoderFuncWithExt("mp3")) //QQ Music Mp3
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common.RegisterDecoder("qmc2", false, DecoderFuncWithExt("m4a")) //QQ Music M4A
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common.RegisterDecoder("qmc4", false, DecoderFuncWithExt("m4a")) //QQ Music M4A
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common.RegisterDecoder("qmc6", false, DecoderFuncWithExt("m4a")) //QQ Music M4A
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common.RegisterDecoder("qmc8", false, DecoderFuncWithExt("m4a")) //QQ Music M4A
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common.RegisterDecoder("qmcflac", false, DecoderFuncWithExt("flac")) //QQ Music Flac
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common.RegisterDecoder("qmcogg", false, DecoderFuncWithExt("ogg")) //QQ Music Ogg
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common.RegisterDecoder("tkm", false, DecoderFuncWithExt("m4a")) //QQ Music Accompaniment M4a
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common.RegisterDecoder("bkcmp3", false, DecoderFuncWithExt("mp3")) //Moo Music Mp3
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common.RegisterDecoder("bkcflac", false, DecoderFuncWithExt("flac")) //Moo Music Flac
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common.RegisterDecoder("666c6163", false, DecoderFuncWithExt("flac")) //QQ Music Weiyun Flac
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common.RegisterDecoder("6d7033", false, DecoderFuncWithExt("mp3")) //QQ Music Weiyun Mp3
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common.RegisterDecoder("6f6767", false, DecoderFuncWithExt("ogg")) //QQ Music Weiyun Ogg
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common.RegisterDecoder("6d3461", false, DecoderFuncWithExt("m4a")) //QQ Music Weiyun M4a
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common.RegisterDecoder("776176", false, DecoderFuncWithExt("wav")) //QQ Music Weiyun Wav
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common.RegisterDecoder("mgg", false, NewMgg256Decoder) //QQ Music New Ogg
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common.RegisterDecoder("mflac", false, NewMflac256Decoder) //QQ Music New Flac
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}
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