├── 1.bin
├── 1.rbl
├── README.md
├── gzipHeader.bin
├── my_1.rbl
├── ota_packager_python.py
└── 对比图.png


/1.bin:
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1 |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/1.rbl:
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https://raw.githubusercontent.com/sunkr1995/RT_ota_packager_python/6c3010a07c5dbd20f187ac35e26cdf094f7bdbc3/1.rbl


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/README.md:
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 1 | <!--
 2 |  * @Author: your name
 3 |  * @Date: 2021-07-27 11:24:43
 4 |  * @LastEditTime: 2021-07-27 11:32:31
 5 |  * @LastEditors: Please set LastEditors
 6 |  * @Description: In User Settings Edit
 7 |  * @FilePath: \pkg\README.md
 8 | -->
 9 | # RT-Thread OTA 固件打包器 python版本
10 | 
11 | RT-Thread OTA 固件打包器原始的固件打包器操作不便，无法在linux上运行，不便于自动打包，自动更新版本。
12 | 于是研究了几天，写了一个python的版本，现仅支持gzip压缩,(对我来说足够了。。。quicklz实在太古老。。。)
13 | 
14 | 随便搞了个二进制文件，与原固件打包器的对比如图：
15 | ![avatar](对比图.png)


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/gzipHeader.bin:
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https://raw.githubusercontent.com/sunkr1995/RT_ota_packager_python/6c3010a07c5dbd20f187ac35e26cdf094f7bdbc3/gzipHeader.bin


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/my_1.rbl:
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https://raw.githubusercontent.com/sunkr1995/RT_ota_packager_python/6c3010a07c5dbd20f187ac35e26cdf094f7bdbc3/my_1.rbl


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/ota_packager_python.py:
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  1 | '''
  2 | Author: your name
  3 | Date: 2021-07-15 10:05:16
  4 | LastEditTime: 2021-07-20 14:25:35
  5 | LastEditors: Please set LastEditors
  6 | Description: In User Settings Edit
  7 | FilePath: \pkg\3.py
  8 | '''
  9 | import gzip
 10 | import os
 11 | import struct
 12 | import zlib
 13 | 
 14 | from Crypto import Random
 15 | from Crypto.Cipher import AES
 16 | 
 17 | """
 18 | aes加密算法
 19 | padding : PKCS7
 20 | """
 21 | 
 22 | class AESUtil:
 23 | 
 24 |     __BLOCK_SIZE_16 = BLOCK_SIZE_16 = AES.block_size
 25 | 
 26 |     @staticmethod
 27 |     def encryt(string, key, iv):
 28 |         """
 29 |         加密文本
 30 |         :param string: 文本
 31 |         :param key: 密钥
 32 |         :param iv: 偏移量/初始向量
 33 |         :return: 密文
 34 |         """
 35 |         #print (string)
 36 |         
 37 |         cipher = AES.new(key, AES.MODE_CBC, iv)
 38 |         x = AESUtil.__BLOCK_SIZE_16 - (len(string) % AESUtil.__BLOCK_SIZE_16)
 39 |         # 如果最后一块不够16位需要用字符进行补全
 40 |         if x != 0:
 41 |             string = string + bytes(chr(x)*x,encoding="utf-8")
 42 | 
 43 |         msg = cipher.encrypt(string)
 44 |         
 45 |         # msg = base64.urlsafe_b64encode(msg).replace('=', '')
 46 |         # msg = base64.b64encode(msg)
 47 |         return msg
 48 | 
 49 |     @staticmethod
 50 |     def decrypt(en_str, key, iv):
 51 |         cipher = AES.new(key, AES.MODE_CBC, iv)
 52 |         # en_str += (len(en_str) % 4)*"="
 53 |         # decryptByts = base64.urlsafe_b64decode(en_str)
 54 |         # decryptByts = base64.b64decode(en_str)
 55 |         # msg = cipher.decrypt(decryptByts)
 56 | 
 57 |         msg = cipher.decrypt(en_str)
 58 |         padding_len = msg[len(msg)-1]
 59 |         return msg[0:-padding_len]
 60 | 
 61 | 
 62 | def crc32(bytes_obj):
 63 |     hashs = 0
 64 |     hashs = zlib.crc32(bytes_obj)
 65 |     return hashs
 66 | 
 67 | def fnv1a_r(oneByte,has):
 68 |     return ((oneByte ^ has)*0x1000193) & 0xFFFFFFFF
 69 | 
 70 | def getHashCode(data):
 71 |     has = 0x811c9dc5
 72 |     for i in range(len(data)):
 73 |         has = fnv1a_r(data[i],has)
 74 |     return has
 75 | 
 76 | def gethead(filename,ori_obj,dst_obj):
 77 |     ###  ("type_4")
 78 |     type_name = b'RBL'
 79 |     type_4 = struct.pack('4s',type_name)
 80 | 
 81 |     ###  ("fota_algo")
 82 |     fota_algo = 258#int(statinfo.st_ctime)
 83 |     algo = struct.pack('<H',fota_algo)
 84 | 
 85 |     ###  ("ctime")
 86 |     statinfo=os.stat(filename)
 87 |     
 88 |     ctime = int(statinfo.st_mtime)
 89 |     ct = struct.pack('<I',ctime)
 90 |     ct = b'\x00'*(6-len(ct)) + ct 
 91 | 
 92 |     ###  ("app_part_name")
 93 |     app_part_name = b'app'
 94 |     apn = struct.pack('16s',app_part_name)
 95 | 
 96 |     ###  ("download_version")
 97 |     download_version  = b'2.0.6'
 98 |     dv = struct.pack('24s',download_version)
 99 | 
100 |     ###  ("current_version")
101 |     current_version  = b'00010203040506070809'
102 |     cv = struct.pack('24s',current_version)
103 | 
104 |     ###  ("body_crc32")
105 |     body_crc32 = struct.pack('<I',crc32(dst_obj))
106 | 
107 |     ###  ("HASH_CODE")
108 |     hash_val = struct.pack('<I',getHashCode(ori_obj))
109 | 
110 |     raw_size = len(ori_obj)
111 |     raw_size = struct.pack('<I',raw_size)
112 |     com_size = len(dst_obj)
113 |     com_size = struct.pack('<I',com_size)
114 | 
115 |     head = type_4 + algo + ct + apn + dv + cv + body_crc32 + hash_val + raw_size + com_size
116 |     head = head + struct.pack('<I',crc32(head))
117 |     return head
118 | 
119 | 
120 | if __name__ == "__main__":
121 |     key = b"0123456789ABCDEF0123456789ABCDEF"   # 32位
122 |     iv = b"0123456789ABCDEF"    # 16位
123 |     with open("gzipHeader.bin","rb") as f:
124 |         gzipheader = f.read()
125 |     print ("gzip文件头",gzipheader)
126 |     print ("gzip文件头长度",len(gzipheader))
127 | 
128 |     #for i in range(96):
129 |     #    print (i,A[i])
130 | 
131 | 
132 |     filename = "1.bin"
133 |     with open (filename,"rb") as f:
134 |         bytes_obj = f.read()
135 |         print("加密压缩前文件长度：",len(bytes_obj))
136 |         ### gizp 压缩
137 |         tmp_gizp = gzip.compress(bytes_obj,compresslevel=6)
138 |         tmp = gzipheader + tmp_gizp[10:]
139 |         ### aes 加密
140 |         res = AESUtil.encryt(tmp, key, iv)
141 |         my_head = gethead(filename,bytes_obj,res)
142 |         print (my_head)
143 |         print("加密压缩后文件长度：",len(res))
144 |         
145 |     with open("my_1.rbl","wb") as f:
146 |         f.write(my_head)
147 |         f.write(res)
148 | 


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/对比图.png:
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https://raw.githubusercontent.com/sunkr1995/RT_ota_packager_python/6c3010a07c5dbd20f187ac35e26cdf094f7bdbc3/对比图.png


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