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Use tempfile instead of memory to prepare the plaintext and cipher bu… #145

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Use tempfile instead of memory to prepare the plaintext and cipher bu… #145

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52 changes: 37 additions & 15 deletions tools/ps3py/pkg.py
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@

import struct
import sys
import tempfile
import hashlib
import os
import getopt
Expand Down Expand Up @@ -235,6 +236,26 @@ def setContextNum(key, tmpnum):

import pkgcrypt

def cryptfile(key, infile, outfile):
if not isinstance(key, list):
return b""
# Call our ultra fast c implemetation
infile.seek(0, 2)
length = infile.tell()
infile.seek(0)
offset = 0
BS = 8 * 1024 * 1024
while length:
len = length
if len > BS:
len = BS
inbuf = infile.read(len)
data, new_key = pkgcrypt.pkgcrypt(listToString(key), inbuf, len);
outfile.write(data)
length = length - len
offset = offset + len
key[:] = new_key

def crypt(key, inbuf, length):
if not isinstance(key, list):
return ""
Expand Down Expand Up @@ -427,7 +448,7 @@ def pack(folder, contentid, outname=None):
files = []
getFiles(files, folder, folder)
header.itemCount = len(files)
dataToEncrypt = b""
tmpFile = tempfile.TemporaryFile()
fileDescLength = 0
fileOff = 0x20 * len(files)
for file in files:
Expand All @@ -437,12 +458,12 @@ def pack(folder, contentid, outname=None):
for file in files:
file.fileOff = fileOff
fileOff += (file.fileSize + 0x0F) & ~0x0F
dataToEncrypt += file.pack()
tmpFile.write(file.pack())
for file in files:
alignedSize = (file.fileNameLength + 0x0F) & ~0x0F
dataToEncrypt += file.fileName
dataToEncrypt += b"\0" * (alignedSize-file.fileNameLength)
fileDescLength = len(dataToEncrypt)
tmpFile.write(file.fileName)
tmpFile.write(b"\0" * (alignedSize-file.fileNameLength))
fileDescLength = tmpFile.tell()
for file in files:
if not file.flags & 0xFF == TYPE_DIRECTORY:
path = os.path.join(folder, file.fileNameStr())
Expand All @@ -469,7 +490,7 @@ def pack(folder, contentid, outname=None):
break
digestOff += len(digest)
if appheader.appType == 8 and found:
dataToEncrypt += fileData[0:digestOff]
tmpFile.write(fileData[0:digestOff])

meta = EbootMeta()
meta.magic = 0x4E504400
Expand All @@ -486,20 +507,22 @@ def pack(folder, contentid, outname=None):
else:
meta.notXORKLSHA1[i] = (0 ^ meta.notSHA1[i] ^ 0xAA) & 0xFF
meta.nulls[i] = 0
dataToEncrypt += meta.pack()
dataToEncrypt += fileData[digestOff + 0x80:]
tmpFile.write(meta.pack())
tmpFile.write(fileData[digestOff + 0x80:])
else:
dataToEncrypt += fileData
tmpFile.write(fileData)
else:
dataToEncrypt += fileData
tmpFile.write(fileData)

dataToEncrypt += b'\0' * (((file.fileSize + 0x0F) & ~0x0F) - len(fileData))
header.dataSize = len(dataToEncrypt)
tmpFile.write(b'\0' * (((file.fileSize + 0x0F) & ~0x0F) - len(fileData)))
tmpFile.seek(0, 2)
header.dataSize = tmpFile.tell()
metaBlock.dataSize = header.dataSize
header.packageSize = header.dataSize + 0x1A0
head = header.pack()
qadigest.update(head)
qadigest.update(dataToEncrypt[0:fileDescLength])
tmpFile.seek(0)
qadigest.update(tmpFile.read(fileDescLength))
QA_Digest = qadigest.digest()

for i in range(0, 0x10):
Expand Down Expand Up @@ -539,8 +562,7 @@ def pack(folder, contentid, outname=None):
outFile.write(metaBlockSHAPadEnc)

context = keyToContext(header.QADigest)
encData = crypt(context, dataToEncrypt, header.dataSize)
outFile.write(encData)
cryptfile(context, tmpFile, outFile)
outFile.write(b'\0' * 0x60)
outFile.close()
print(header)
Expand Down