refactor: use kgm crypto from `parakeet-rs`

chore: update deps

algo/kgm/kgm.go

@@ -2,29 +2,26 @@ package kgm
 
 import (
 	"bytes"
-	"encoding/binary"
-	"errors"
+	"fmt"
+	"io"
 
 	"github.com/unlock-music/cli/algo/common"
 )
 
-var (
-	vprHeader = []byte{
-		0x05, 0x28, 0xBC, 0x96, 0xE9, 0xE4, 0x5A, 0x43,
-		0x91, 0xAA, 0xBD, 0xD0, 0x7A, 0xF5, 0x36, 0x31}
-	kgmHeader = []byte{
-		0x7C, 0xD5, 0x32, 0xEB, 0x86, 0x02, 0x7F, 0x4B,
-		0xA8, 0xAF, 0xA6, 0x8E, 0x0F, 0xFF, 0x99, 0x14}
-	ErrKgmMagicHeader = errors.New("kgm/vpr magic header not matched")
-)
-
 type Decoder struct {
+	header      Header
+	initializer kgmCryptoInitializer
+
 	file  []byte
-	key      []byte
-	maskFunc func(int) byte
 	audio []byte
 }
 
+type kgmCryptoInitializer func(header *Header, body io.Reader) (io.Reader, error)
+
+var kgmCryptoInitializers = map[uint32]kgmCryptoInitializer{
+	3: newKgmCryptoV3,
+}
+
 func NewDecoder(file []byte) common.Decoder {
 	return &Decoder{
 		file: file,
@@ -44,31 +41,34 @@ func (d *Decoder) GetMeta() common.Meta {
 }
 
 func (d *Decoder) Validate() error {
-	if bytes.Equal(kgmHeader, d.file[:len(kgmHeader)]) {
-		d.maskFunc = getKgmMask
-	} else if bytes.Equal(vprHeader, d.file[:len(vprHeader)]) {
-		d.maskFunc = getVprMask
-	} else {
-		return ErrKgmMagicHeader
+	if err := d.header.FromBytes(d.file); err != nil {
+		return err
+	}
+	// TODO; validate crypto version
+
+	var ok bool
+	d.initializer, ok = kgmCryptoInitializers[d.header.CryptoVersion]
+	if !ok {
+		return fmt.Errorf("kgm: unsupported crypto version %d", d.header.CryptoVersion)
 	}
 
-	d.key = d.file[0x1c:0x2c]
-	d.key = append(d.key, 0x00)
-	_ = d.file[0x2c:0x3c] //todo: key2
 	return nil
 }
 
 func (d *Decoder) Decode() error {
-	headerLen := binary.LittleEndian.Uint32(d.file[0x10:0x14])
-	d.audio = d.file[headerLen:]
+	d.audio = d.file[d.header.AudioOffset:]
 
-	for i := 0; i < len(d.audio); i++ {
-		med8 := d.audio[i] ^ d.key[i%17] ^ d.maskFunc(i)
-		d.audio[i] = med8 ^ (med8&0xf)<<4
+	r, err := d.initializer(&d.header, bytes.NewReader(d.audio))
+	if err != nil {
+		return fmt.Errorf("kgm: failed to initialize crypto: %w", err)
+	}
+	d.audio, err = io.ReadAll(r)
+	if err != nil {
+		return fmt.Errorf("kgm: failed to decrypt audio: %w", err)
 	}
-
 	return nil
 }
+
 func init() {
 	// Kugou
 	common.RegisterDecoder("kgm", false, NewDecoder)

algo/kgm/kgm_header.go

@@ -0,0 +1,64 @@
+package kgm
+
+import (
+	"bytes"
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"io"
+)
+
+var (
+	vprHeader = []byte{
+		0x05, 0x28, 0xBC, 0x96, 0xE9, 0xE4, 0x5A, 0x43,
+		0x91, 0xAA, 0xBD, 0xD0, 0x7A, 0xF5, 0x36, 0x31,
+	}
+	kgmHeader = []byte{
+		0x7C, 0xD5, 0x32, 0xEB, 0x86, 0x02, 0x7F, 0x4B,
+		0xA8, 0xAF, 0xA6, 0x8E, 0x0F, 0xFF, 0x99, 0x14,
+	}
+
+	ErrKgmMagicHeader = errors.New("kgm magic header not matched")
+)
+
+// Header is the header of a KGM file.
+type Header struct {
+	MagicHeader    []byte // 0x00-0x0f: magic header
+	AudioOffset    uint32 // 0x10-0x13: offset of audio data
+	CryptoVersion  uint32 // 0x14-0x17: crypto version
+	CryptoSlot     uint32 // 0x18-0x1b: crypto key slot
+	CryptoTestData []byte // 0x1c-0x2b: crypto test data
+	CryptoKey      []byte // 0x2c-0x3b: crypto key
+}
+
+func (h *Header) FromFile(rd io.ReadSeeker) error {
+	if _, err := rd.Seek(0, io.SeekStart); err != nil {
+		return fmt.Errorf("kgm seek start: %w", err)
+	}
+
+	buf := make([]byte, 0x3c)
+	if _, err := io.ReadFull(rd, buf); err != nil {
+		return fmt.Errorf("kgm read header: %w", err)
+	}
+
+	return h.FromBytes(buf)
+}
+
+func (h *Header) FromBytes(buf []byte) error {
+	if len(buf) < 0x3c {
+		return errors.New("invalid kgm header length")
+	}
+
+	h.MagicHeader = buf[:0x10]
+	if !bytes.Equal(kgmHeader, h.MagicHeader) && !bytes.Equal(vprHeader, h.MagicHeader) {
+		return ErrKgmMagicHeader
+	}
+
+	h.AudioOffset = binary.LittleEndian.Uint32(buf[0x10:0x14])
+	h.CryptoVersion = binary.LittleEndian.Uint32(buf[0x14:0x18])
+	h.CryptoSlot = binary.LittleEndian.Uint32(buf[0x18:0x1c])
+	h.CryptoTestData = buf[0x1c:0x2c]
+	h.CryptoKey = buf[0x2c:0x3c]
+
+	return nil
+}

algo/kgm/kgm_v3.go

@@ -0,0 +1,66 @@
+package kgm
+
+import (
+	"crypto/md5"
+	"fmt"
+	"io"
+)
+
+// kgmCryptoV3 is kgm file crypto v3
+type kgmCryptoV3 struct {
+	slotBox []byte
+	fileBox []byte
+
+	rd     io.Reader
+	offset int
+}
+
+var kgmV3Slot2Key = map[uint32][]byte{
+	1: {0x6C, 0x2C, 0x2F, 0x27},
+}
+
+func newKgmCryptoV3(header *Header, body io.Reader) (io.Reader, error) {
+	c := &kgmCryptoV3{rd: body}
+
+	slotKey, ok := kgmV3Slot2Key[header.CryptoSlot]
+	if !ok {
+		return nil, fmt.Errorf("kgm3: unknown crypto slot %d", header.CryptoSlot)
+	}
+	c.slotBox = kugouMD5(slotKey)
+
+	c.fileBox = append(kugouMD5(header.CryptoKey), 0x6b)
+
+	return c, nil
+}
+
+func (d *kgmCryptoV3) Read(buf []byte) (int, error) {
+	n, err := d.rd.Read(buf)
+	if n > 0 {
+		d.decrypt(buf[:n], d.offset)
+		d.offset += n
+	}
+	return n, err
+}
+
+func (d *kgmCryptoV3) decrypt(b []byte, offset int) {
+	for i := 0; i < len(b); i++ {
+		b[i] ^= d.fileBox[(offset+i)%len(d.fileBox)]
+		b[i] ^= b[i] << 4
+		b[i] ^= d.slotBox[(offset+i)%len(d.slotBox)]
+		b[i] ^= xorCollapseUint32(uint32(offset + i))
+	}
+}
+
+func xorCollapseUint32(i uint32) byte {
+	return byte(i) ^ byte(i>>8) ^ byte(i>>16) ^ byte(i>>24)
+}
+
+func kugouMD5(b []byte) []byte {
+	digest := md5.Sum(b)
+	ret := make([]byte, 16)
+	for i := 0; i < md5.Size; i += 2 {
+		ret[i] = digest[14-i]
+		ret[i+1] = digest[14-i+1]
+	}
+	return ret
+}

algo/kgm/mask.go

@@ -1,88 +0,0 @@
-package kgm
-
-import (
-	_ "embed"
-)
-
-var kgmMaskTable1 = [...]byte{
-	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-	0x00, 0x01, 0x21, 0x01, 0x61, 0x01, 0x21, 0x01, 0xe1, 0x01, 0x21, 0x01, 0x61, 0x01, 0x21, 0x01,
-	0xd2, 0x23, 0x02, 0x02, 0x42, 0x42, 0x02, 0x02, 0xc2, 0xc2, 0x02, 0x02, 0x42, 0x42, 0x02, 0x02,
-	0xd3, 0xd3, 0x02, 0x03, 0x63, 0x43, 0x63, 0x03, 0xe3, 0xc3, 0xe3, 0x03, 0x63, 0x43, 0x63, 0x03,
-	0x94, 0xb4, 0x94, 0x65, 0x04, 0x04, 0x04, 0x04, 0x84, 0x84, 0x84, 0x84, 0x04, 0x04, 0x04, 0x04,
-	0x95, 0x95, 0x95, 0x95, 0x04, 0x05, 0x25, 0x05, 0xe5, 0x85, 0xa5, 0x85, 0xe5, 0x05, 0x25, 0x05,
-	0xd6, 0xb6, 0x96, 0xb6, 0xd6, 0x27, 0x06, 0x06, 0xc6, 0xc6, 0x86, 0x86, 0xc6, 0xc6, 0x06, 0x06,
-	0xd7, 0xd7, 0x97, 0x97, 0xd7, 0xd7, 0x06, 0x07, 0xe7, 0xc7, 0xe7, 0x87, 0xe7, 0xc7, 0xe7, 0x07,
-	0x18, 0x38, 0x18, 0x78, 0x18, 0x38, 0x18, 0xe9, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08,
-	0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x08, 0x09, 0x29, 0x09, 0x69, 0x09, 0x29, 0x09,
-	0xda, 0x3a, 0x1a, 0x3a, 0x5a, 0x3a, 0x1a, 0x3a, 0xda, 0x2b, 0x0a, 0x0a, 0x4a, 0x4a, 0x0a, 0x0a,
-	0xdb, 0xdb, 0x1b, 0x1b, 0x5b, 0x5b, 0x1b, 0x1b, 0xdb, 0xdb, 0x0a, 0x0b, 0x6b, 0x4b, 0x6b, 0x0b,
-	0x9c, 0xbc, 0x9c, 0x7c, 0x1c, 0x3c, 0x1c, 0x7c, 0x9c, 0xbc, 0x9c, 0x6d, 0x0c, 0x0c, 0x0c, 0x0c,
-	0x9d, 0x9d, 0x9d, 0x9d, 0x1d, 0x1d, 0x1d, 0x1d, 0x9d, 0x9d, 0x9d, 0x9d, 0x0c, 0x0d, 0x2d, 0x0d,
-	0xde, 0xbe, 0x9e, 0xbe, 0xde, 0x3e, 0x1e, 0x3e, 0xde, 0xbe, 0x9e, 0xbe, 0xde, 0x2f, 0x0e, 0x0e,
-	0xdf, 0xdf, 0x9f, 0x9f, 0xdf, 0xdf, 0x1f, 0x1f, 0xdf, 0xdf, 0x9f, 0x9f, 0xdf, 0xdf, 0x0e, 0x0f,
-	0x00, 0x20, 0x00, 0x60, 0x00, 0x20, 0x00, 0xe0, 0x00, 0x20, 0x00, 0x60, 0x00, 0x20, 0x00, 0xf1,
-}
-
-var kgmMaskTable2 = [...]byte{
-	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-	0x00, 0x01, 0x23, 0x01, 0x67, 0x01, 0x23, 0x01, 0xef, 0x01, 0x23, 0x01, 0x67, 0x01, 0x23, 0x01,
-	0xdf, 0x21, 0x02, 0x02, 0x46, 0x46, 0x02, 0x02, 0xce, 0xce, 0x02, 0x02, 0x46, 0x46, 0x02, 0x02,
-	0xde, 0xde, 0x02, 0x03, 0x65, 0x47, 0x65, 0x03, 0xed, 0xcf, 0xed, 0x03, 0x65, 0x47, 0x65, 0x03,
-	0x9d, 0xbf, 0x9d, 0x63, 0x04, 0x04, 0x04, 0x04, 0x8c, 0x8c, 0x8c, 0x8c, 0x04, 0x04, 0x04, 0x04,
-	0x9c, 0x9c, 0x9c, 0x9c, 0x04, 0x05, 0x27, 0x05, 0xeb, 0x8d, 0xaf, 0x8d, 0xeb, 0x05, 0x27, 0x05,
-	0xdb, 0xbd, 0x9f, 0xbd, 0xdb, 0x25, 0x06, 0x06, 0xca, 0xca, 0x8e, 0x8e, 0xca, 0xca, 0x06, 0x06,
-	0xda, 0xda, 0x9e, 0x9e, 0xda, 0xda, 0x06, 0x07, 0xe9, 0xcb, 0xe9, 0x8f, 0xe9, 0xcb, 0xe9, 0x07,
-	0x19, 0x3b, 0x19, 0x7f, 0x19, 0x3b, 0x19, 0xe7, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08,
-	0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x08, 0x09, 0x2b, 0x09, 0x6f, 0x09, 0x2b, 0x09,
-	0xd7, 0x39, 0x1b, 0x39, 0x5f, 0x39, 0x1b, 0x39, 0xd7, 0x29, 0x0a, 0x0a, 0x4e, 0x4e, 0x0a, 0x0a,
-	0xd6, 0xd6, 0x1a, 0x1a, 0x5e, 0x5e, 0x1a, 0x1a, 0xd6, 0xd6, 0x0a, 0x0b, 0x6d, 0x4f, 0x6d, 0x0b,
-	0x95, 0xb7, 0x95, 0x7b, 0x1d, 0x3f, 0x1d, 0x7b, 0x95, 0xb7, 0x95, 0x6b, 0x0c, 0x0c, 0x0c, 0x0c,
-	0x94, 0x94, 0x94, 0x94, 0x1c, 0x1c, 0x1c, 0x1c, 0x94, 0x94, 0x94, 0x94, 0x0c, 0x0d, 0x2f, 0x0d,
-	0xd3, 0xb5, 0x97, 0xb5, 0xd3, 0x3d, 0x1f, 0x3d, 0xd3, 0xb5, 0x97, 0xb5, 0xd3, 0x2d, 0x0e, 0x0e,
-	0xd2, 0xd2, 0x96, 0x96, 0xd2, 0xd2, 0x1e, 0x1e, 0xd2, 0xd2, 0x96, 0x96, 0xd2, 0xd2, 0x0e, 0x0f,
-	0x00, 0x22, 0x00, 0x66, 0x00, 0x22, 0x00, 0xee, 0x00, 0x22, 0x00, 0x66, 0x00, 0x22, 0x00, 0xfe,
-}
-
-var kgmMaskTable3 = [...]byte{
-	0xB8, 0xD5, 0x3D, 0xB2, 0xE9, 0xAF, 0x78, 0x8C, 0x83, 0x33, 0x71, 0x51, 0x76, 0xA0, 0xCD, 0x37,
-	0x2F, 0x3E, 0x35, 0x8D, 0xA9, 0xBE, 0x98, 0xB7, 0xE7, 0x8C, 0x22, 0xCE, 0x5A, 0x61, 0xDF, 0x68,
-	0x69, 0x89, 0xFE, 0xA5, 0xB6, 0xDE, 0xA9, 0x77, 0xFC, 0xC8, 0xBD, 0xBD, 0xE5, 0x6D, 0x3E, 0x5A,
-	0x36, 0xEF, 0x69, 0x4E, 0xBE, 0xE1, 0xE9, 0x66, 0x1C, 0xF3, 0xD9, 0x02, 0xB6, 0xF2, 0x12, 0x9B,
-	0x44, 0xD0, 0x6F, 0xB9, 0x35, 0x89, 0xB6, 0x46, 0x6D, 0x73, 0x82, 0x06, 0x69, 0xC1, 0xED, 0xD7,
-	0x85, 0xC2, 0x30, 0xDF, 0xA2, 0x62, 0xBE, 0x79, 0x2D, 0x62, 0x62, 0x3D, 0x0D, 0x7E, 0xBE, 0x48,
-	0x89, 0x23, 0x02, 0xA0, 0xE4, 0xD5, 0x75, 0x51, 0x32, 0x02, 0x53, 0xFD, 0x16, 0x3A, 0x21, 0x3B,
-	0x16, 0x0F, 0xC3, 0xB2, 0xBB, 0xB3, 0xE2, 0xBA, 0x3A, 0x3D, 0x13, 0xEC, 0xF6, 0x01, 0x45, 0x84,
-	0xA5, 0x70, 0x0F, 0x93, 0x49, 0x0C, 0x64, 0xCD, 0x31, 0xD5, 0xCC, 0x4C, 0x07, 0x01, 0x9E, 0x00,
-	0x1A, 0x23, 0x90, 0xBF, 0x88, 0x1E, 0x3B, 0xAB, 0xA6, 0x3E, 0xC4, 0x73, 0x47, 0x10, 0x7E, 0x3B,
-	0x5E, 0xBC, 0xE3, 0x00, 0x84, 0xFF, 0x09, 0xD4, 0xE0, 0x89, 0x0F, 0x5B, 0x58, 0x70, 0x4F, 0xFB,
-	0x65, 0xD8, 0x5C, 0x53, 0x1B, 0xD3, 0xC8, 0xC6, 0xBF, 0xEF, 0x98, 0xB0, 0x50, 0x4F, 0x0F, 0xEA,
-	0xE5, 0x83, 0x58, 0x8C, 0x28, 0x2C, 0x84, 0x67, 0xCD, 0xD0, 0x9E, 0x47, 0xDB, 0x27, 0x50, 0xCA,
-	0xF4, 0x63, 0x63, 0xE8, 0x97, 0x7F, 0x1B, 0x4B, 0x0C, 0xC2, 0xC1, 0x21, 0x4C, 0xCC, 0x58, 0xF5,
-	0x94, 0x52, 0xA3, 0xF3, 0xD3, 0xE0, 0x68, 0xF4, 0x00, 0x23, 0xF3, 0x5E, 0x0A, 0x7B, 0x93, 0xDD,
-	0xAB, 0x12, 0xB2, 0x13, 0xE8, 0x84, 0xD7, 0xA7, 0x9F, 0x0F, 0x32, 0x4C, 0x55, 0x1D, 0x04, 0x36,
-	0x52, 0xDC, 0x03, 0xF3, 0xF9, 0x4E, 0x42, 0xE9, 0x3D, 0x61, 0xEF, 0x7C, 0xB6, 0xB3, 0x93, 0x50,
-}
-
-func getKgmMask(i int) byte {
-	offset := i >> 4
-	value := byte(0)
-	for offset >= 17 {
-		value ^= kgmMaskTable1[offset%(16*17)]
-		offset = offset >> 4
-		value ^= kgmMaskTable2[offset%(16*17)]
-		offset = offset >> 4
-	}
-
-	return kgmMaskTable3[i%(16*17)] ^ value
-}
-
-var vprMaskDiffKgm = []byte{
-	0x75, 0x2F, 0x68, 0xC6, 0x25, 0xFE, 0x25, 0xEE,
-	0xDF, 0x80, 0xC3, 0xFD, 0x38, 0xD6, 0xD3, 0x01,
-	0x00,
-}
-
-func getVprMask(i int) byte {
-	return vprMaskDiffKgm[i%17] ^ getKgmMask(i)
-}

go.mod

@@ -3,15 +3,15 @@ module github.com/unlock-music/cli
 go 1.17
 
 require (
-	github.com/ulikunitz/xz v0.5.10
-	github.com/urfave/cli/v2 v2.3.0
-	go.uber.org/zap v1.19.1
-	golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550
+	github.com/urfave/cli/v2 v2.23.5
+	go.uber.org/zap v1.23.0
+	golang.org/x/crypto v0.3.0
 )
 
 require (
-	github.com/cpuguy83/go-md2man/v2 v2.0.1 // indirect
+	github.com/cpuguy83/go-md2man/v2 v2.0.2 // indirect
 	github.com/russross/blackfriday/v2 v2.1.0 // indirect
-	go.uber.org/atomic v1.9.0 // indirect
-	go.uber.org/multierr v1.7.0 // indirect
+	github.com/xrash/smetrics v0.0.0-20201216005158-039620a65673 // indirect
+	go.uber.org/atomic v1.10.0 // indirect
+	go.uber.org/multierr v1.8.0 // indirect
 )

go.sum

@@ -1,9 +1,8 @@
-github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/BurntSushi/toml v1.2.1/go.mod h1:CxXYINrC8qIiEnFrOxCa7Jy5BFHlXnUU2pbicEuybxQ=
 github.com/benbjohnson/clock v1.1.0 h1:Q92kusRqC1XV2MjkWETPvjJVqKetz1OzxZB7mHJLju8=
 github.com/benbjohnson/clock v1.1.0/go.mod h1:J11/hYXuz8f4ySSvYwY0FKfm+ezbsZBKZxNJlLklBHA=
-github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
-github.com/cpuguy83/go-md2man/v2 v2.0.1 h1:r/myEWzV9lfsM1tFLgDyu0atFtJ1fXn261LKYj/3DxU=
-github.com/cpuguy83/go-md2man/v2 v2.0.1/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
+github.com/cpuguy83/go-md2man/v2 v2.0.2 h1:p1EgwI/C7NhT0JmVkwCD2ZBK8j4aeHQX2pMHHBfMQ6w=
+github.com/cpuguy83/go-md2man/v2 v2.0.2/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
@@ -14,60 +13,76 @@ github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
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