68 lines
2.1 KiB
Python
68 lines
2.1 KiB
Python
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from crypto.PBKDF2 import PBKDF2
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from crypto.aes import AESdecryptCBC
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from util import read_file, write_file, makedirs, readPlist
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from util.bplist import BPlistReader
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import hashlib
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import struct
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import glob
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import sys
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import os
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"""
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decrypt iOS 3 backup blob (metadata and file contents)
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"""
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def decrypt_blob(blob, auth_key):
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len = struct.unpack(">H", blob[0:2])[0]
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if len != 66:
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print "blob len != 66"
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magic = struct.unpack(">H", blob[2:4])[0]
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if magic != 0x0100:
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print "magic != 0x0100"
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iv = blob[4:20]
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blob_key = AESdecryptCBC(blob[20:68], auth_key, iv)[:32]
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return AESdecryptCBC(blob[68:], blob_key, iv, padding=True)
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def decrypt_backup3(backupfolder, outputfolder, passphrase):
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auth_key = None
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manifest = readPlist(backupfolder + "/Manifest.plist")
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if manifest["IsEncrypted"]:
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manifest_data = manifest["Data"].data
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authdata = manifest["AuthData"].data
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pkbdf_salt = authdata[:8]
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iv = authdata[8:24]
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key = PBKDF2(passphrase,pkbdf_salt,iterations=2000).read(32)
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data = AESdecryptCBC(authdata[24:], key, iv)
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auth_key = data[:32]
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if hashlib.sha1(auth_key).digest() != data[32:52]:
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print "wrong auth key (hash mismatch) => wrong passphrase"
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return
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print "Passphrase seems OK"
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for mdinfo_name in glob.glob(backupfolder + "/*.mdinfo"):
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mddata_name = mdinfo_name[:-7] + ".mddata"
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mdinfo = readPlist(mdinfo_name)
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metadata = mdinfo["Metadata"].data
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if mdinfo["IsEncrypted"]:
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metadata = decrypt_blob(metadata, auth_key)
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metadata = BPlistReader.plistWithString(metadata)
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print metadata["Path"]
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filedata = read_file(mddata_name)
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if mdinfo["IsEncrypted"]:
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filedata = decrypt_blob(filedata, auth_key)
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filename = metadata["Path"]
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makedirs(outputfolder + "/" + os.path.dirname(filename))
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write_file(outputfolder + "/" + filename, filedata)
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