godot加密

extends Node

static func pad(a_in:PackedByteArray, a_bytes:int) -> PackedByteArray:
    assert(a_bytes >- 0x04)
    assert(a_bytes <= 0x7f)
    a_bytes = a_bytes & 0x7c
    var ilen:int = a_in.size()
    var blen:int = ilen + (a_bytes - (ilen % a_bytes))
    var n:int = blen - ilen
    if (n == 0): n = a_bytes
    for i in range(n):
        a_in.append(n)
    return a_in

# 密钥32位 AES-256-ECB
static func encode(data, key):
    if !data: return
    data = JSON.stringify(data, "", false)
    var aes = AESContext.new()
    aes.start(AESContext.MODE_ECB_ENCRYPT, key.to_utf8_buffer())
    var encrypted = aes.update(pad(data.to_utf8_buffer(), 16))
    aes.finish()
    return Marshalls.raw_to_base64(encrypted).uri_encode()

static func decode(encode, key):
    if !encode: return
    encode = Marshalls.base64_to_raw(encode.uri_decode())
    var aes = AESContext.new()
    aes.start(AESContext.MODE_ECB_DECRYPT, key.to_utf8_buffer())
    var decrypted = aes.update(encode)
    aes.finish()
    decrypted = JSON.parse_string(decrypted.get_string_from_utf8())
    return decrypted

static func md5(str):
    return str.md5_text()