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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))),
}
}
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