84 lines
2.5 KiB
Go
84 lines
2.5 KiB
Go
package helper
|
|
|
|
import (
|
|
"log"
|
|
|
|
lzstring "github.com/daku10/go-lz-string"
|
|
)
|
|
|
|
// StringDecrypt - langsung coba decompress tanpa decrypt ulang
|
|
func StringDecrypt(key string, encryptedString string) (string, error) {
|
|
log.Printf("StringDecrypt: Attempting decompression, data length: %d", len(encryptedString))
|
|
|
|
// Method 1: Try direct LZ-string decompression (data sudah didecrypt di response.go)
|
|
if result, err := lzstring.DecompressFromEncodedURIComponent(encryptedString); err == nil && len(result) > 0 {
|
|
log.Printf("StringDecrypt: Direct decompression successful")
|
|
return result, nil
|
|
}
|
|
|
|
// Method 2: Try other LZ-string methods
|
|
if result, err := lzstring.DecompressFromBase64(encryptedString); err == nil && len(result) > 0 {
|
|
log.Printf("StringDecrypt: Base64 decompression successful")
|
|
return result, nil
|
|
}
|
|
|
|
// Method 3: If all fail, return the original string
|
|
log.Printf("StringDecrypt: All decompression failed, returning original data")
|
|
return encryptedString, nil
|
|
}
|
|
|
|
func RemovePKCS7Padding(data []byte) []byte {
|
|
if len(data) == 0 {
|
|
return data
|
|
}
|
|
|
|
paddingLength := int(data[len(data)-1])
|
|
|
|
// Validasi padding length
|
|
if paddingLength > len(data) || paddingLength == 0 || paddingLength > 16 {
|
|
log.Printf("RemovePKCS7Padding: Invalid padding length: %d, data length: %d", paddingLength, len(data))
|
|
// Coba kembalikan data tanpa byte terakhir jika padding tampak salah
|
|
if len(data) > 1 {
|
|
return data[:len(data)-1]
|
|
}
|
|
return data
|
|
}
|
|
|
|
// Verify all padding bytes are correct
|
|
paddingStart := len(data) - paddingLength
|
|
for i := paddingStart; i < len(data); i++ {
|
|
if data[i] != byte(paddingLength) {
|
|
log.Printf("RemovePKCS7Padding: Invalid padding byte at position %d, expected %d, got %d", i, paddingLength, data[i])
|
|
// Jika padding tidak valid, coba cari padding yang benar
|
|
return findValidPadding(data)
|
|
}
|
|
}
|
|
|
|
result := data[:paddingStart]
|
|
log.Printf("RemovePKCS7Padding: Successfully removed %d padding bytes", paddingLength)
|
|
return result
|
|
}
|
|
|
|
// Fungsi baru untuk mencari padding yang valid
|
|
func findValidPadding(data []byte) []byte {
|
|
dataLen := len(data)
|
|
|
|
// Coba berbagai kemungkinan padding length (1-16)
|
|
for padLen := 1; padLen <= 16 && padLen <= dataLen; padLen++ {
|
|
valid := true
|
|
for i := dataLen - padLen; i < dataLen; i++ {
|
|
if data[i] != byte(padLen) {
|
|
valid = false
|
|
break
|
|
}
|
|
}
|
|
if valid {
|
|
log.Printf("RemovePKCS7Padding: Found valid padding of length %d", padLen)
|
|
return data[:dataLen-padLen]
|
|
}
|
|
}
|
|
|
|
log.Printf("RemovePKCS7Padding: No valid padding found, returning original data")
|
|
return data
|
|
}
|