feat: add supports for netease music driver (#6423 close #5364)

drivers/netease_music/crypto.go

@@ -0,0 +1,135 @@
+package netease_music
+
+import (
+	"bytes"
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/md5"
+	"crypto/rsa"
+	"crypto/x509"
+	"encoding/base64"
+	"encoding/hex"
+	"encoding/pem"
+	"math/big"
+	"strings"
+
+	"github.com/alist-org/alist/v3/pkg/utils"
+	"github.com/alist-org/alist/v3/pkg/utils/random"
+)
+
+var (
+	linuxapiKey = []byte("rFgB&h#%2?^eDg:Q")
+	eapiKey     = []byte("e82ckenh8dichen8")
+	iv          = []byte("0102030405060708")
+	presetKey   = []byte("0CoJUm6Qyw8W8jud")
+	publicKey   = []byte("-----BEGIN PUBLIC KEY-----\nMIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDgtQn2JZ34ZC28NWYpAUd98iZ37BUrX/aKzmFbt7clFSs6sXqHauqKWqdtLkF2KexO40H1YTX8z2lSgBBOAxLsvaklV8k4cBFK9snQXE9/DDaFt6Rr7iVZMldczhC0JNgTz+SHXT6CBHuX3e9SdB1Ua44oncaTWz7OBGLbCiK45wIDAQAB\n-----END PUBLIC KEY-----")
+	stdChars    = []byte("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
+)
+
+func aesKeyPending(key []byte) []byte {
+	k := len(key)
+	count := 0
+	switch true {
+	case k <= 16:
+		count = 16 - k
+	case k <= 24:
+		count = 24 - k
+	case k <= 32:
+		count = 32 - k
+	default:
+		return key[:32]
+	}
+	if count == 0 {
+		return key
+	}
+
+	return append(key, bytes.Repeat([]byte{0}, count)...)
+}
+
+func pkcs7Padding(src []byte, blockSize int) []byte {
+	padding := blockSize - len(src)%blockSize
+	padtext := bytes.Repeat([]byte{byte(padding)}, padding)
+	return append(src, padtext...)
+}
+
+func aesCBCEncrypt(src, key, iv []byte) []byte {
+	block, _ := aes.NewCipher(aesKeyPending(key))
+	src = pkcs7Padding(src, block.BlockSize())
+	dst := make([]byte, len(src))
+
+	mode := cipher.NewCBCEncrypter(block, iv)
+	mode.CryptBlocks(dst, src)
+
+	return dst
+}
+
+func aesECBEncrypt(src, key []byte) []byte {
+	block, _ := aes.NewCipher(aesKeyPending(key))
+
+	src = pkcs7Padding(src, block.BlockSize())
+	dst := make([]byte, len(src))
+
+	ecbCryptBlocks(block, dst, src)
+
+	return dst
+}
+
+func ecbCryptBlocks(block cipher.Block, dst, src []byte) {
+	bs := block.BlockSize()
+
+	for len(src) > 0 {
+		block.Encrypt(dst, src[:bs])
+		src = src[bs:]
+		dst = dst[bs:]
+	}
+}
+
+func rsaEncrypt(buffer, key []byte) []byte {
+	buffers := make([]byte, 128-16, 128)
+	buffers = append(buffers, buffer...)
+	block, _ := pem.Decode(key)
+	pubInterface, _ := x509.ParsePKIXPublicKey(block.Bytes)
+	pub := pubInterface.(*rsa.PublicKey)
+	c := new(big.Int).SetBytes([]byte(buffers))
+	return c.Exp(c, big.NewInt(int64(pub.E)), pub.N).Bytes()
+}
+
+func getSecretKey() ([]byte, []byte) {
+	key := make([]byte, 16)
+	reversed := make([]byte, 16)
+	for i := 0; i < 16; i++ {
+		result := stdChars[random.RangeInt64(0, 62)]
+		key[i] = result
+		reversed[15-i] = result
+	}
+	return key, reversed
+}
+
+func weapi(data map[string]string) map[string]string {
+	text, _ := utils.Json.Marshal(data)
+	secretKey, reversedKey := getSecretKey()
+	params := []byte(base64.StdEncoding.EncodeToString(aesCBCEncrypt(text, presetKey, iv)))
+	return map[string]string{
+		"params":    base64.StdEncoding.EncodeToString(aesCBCEncrypt(params, reversedKey, iv)),
+		"encSecKey": hex.EncodeToString(rsaEncrypt(secretKey, publicKey)),
+	}
+}
+
+func eapi(url string, data map[string]interface{}) map[string]string {
+	text, _ := utils.Json.Marshal(data)
+	msg := "nobody" + url + "use" + string(text) + "md5forencrypt"
+	h := md5.New()
+	h.Write([]byte(msg))
+	digest := hex.EncodeToString(h.Sum(nil))
+	params := []byte(url + "-36cd479b6b5-" + string(text) + "-36cd479b6b5-" + digest)
+	return map[string]string{
+		"params": hex.EncodeToString(aesECBEncrypt(params, eapiKey)),
+	}
+}
+
+func linuxapi(data map[string]interface{}) map[string]string {
+	text, _ := utils.Json.Marshal(data)
+	return map[string]string{
+		"eparams": strings.ToUpper(hex.EncodeToString(aesECBEncrypt(text, linuxapiKey))),
+	}
+}