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Fix high memory usage

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This commit is contained in:
Xpl0itU 2023-07-19 19:03:37 +02:00
parent 8ba5a4c1bc
commit 28b2ef38d9
3 changed files with 50 additions and 28 deletions
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25
hash.go
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@ -11,16 +11,8 @@ import (
var commonKey = []byte{0xD7, 0xB0, 0x04, 0x02, 0x65, 0x9B, 0xA2, 0xAB, 0xD2, 0xCB, 0x0D, 0xB2, 0x7F, 0xA2, 0xB6, 0x56}
func checkContentHashes(path string, encryptedTitleKey []byte, titleID []byte, content contentInfo) error {
c, err := aes.NewCipher(commonKey)
if err != nil {
return fmt.Errorf("failed to create AES cipher: %w", err)
}
decryptedTitleKey := make([]byte, len(encryptedTitleKey))
cbc := cipher.NewCBCDecrypter(c, append(titleID, make([]byte, 8)...))
cbc.CryptBlocks(decryptedTitleKey, encryptedTitleKey)
func checkContentHashes(path string, content contentInfo, cipherHashTree *cipher.Block) error {
cHashTree := *cipherHashTree
h3Data, err := os.ReadFile(fmt.Sprintf("%s/%s.h3", path, content.ID))
if err != nil {
return fmt.Errorf("failed to read H3 hash tree file: %w", err)
@ -29,6 +21,7 @@ func checkContentHashes(path string, encryptedTitleKey []byte, titleID []byte, c
if err != nil {
return fmt.Errorf("failed to open encrypted file: %w", err)
}
defer encryptedFile.Close()
h3Hash := sha1.Sum(h3Data)
if !reflect.DeepEqual(h3Hash[:8], content.Hash[:8]) {
@ -36,22 +29,18 @@ func checkContentHashes(path string, encryptedTitleKey []byte, titleID []byte, c
}
chunkCount := int(content.Size / 0x10000)
decryptedContent := make([]byte, content.Size)
decryptedContent := make([]byte, 0x400)
h0HashNum := 0
h1HashNum := 0
h2HashNum := 0
h3HashNum := 0
buffer := make([]byte, 0x400)
iv := make([]byte, aes.BlockSize)
for chunkNum := 0; chunkNum < chunkCount; chunkNum++ {
cipherHashTree, err := aes.NewCipher(decryptedTitleKey)
if err != nil {
return fmt.Errorf("failed to create AES cipher: %w", err)
}
hashTree := cipher.NewCBCDecrypter(cipherHashTree, make([]byte, aes.BlockSize))
buffer := make([]byte, 0x400)
encryptedFile.Read(buffer)
hashTree.CryptBlocks(decryptedContent, buffer)
cipher.NewCBCDecrypter(cHashTree, iv).CryptBlocks(decryptedContent, buffer)
h0Hashes := decryptedContent[0:0x140]
h1Hashes := decryptedContent[0x140:0x280]