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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,44 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "crypto/sha1" | ||
| "encoding/hex" | ||
| "fmt" | ||
| "os" | ||
| "strings" | ||
| ) | ||
|
|
||
| func getCommonKey() ([]byte, error) { | ||
| if fileExists("otp.bin") { | ||
| otp, err := os.ReadFile("otp.bin") | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| commonKey := otp[0x0E0 : 0x0E0+0x10] | ||
| commonKeyHash := sha1.Sum(commonKey) | ||
| if hex.EncodeToString(commonKeyHash[:]) != "6a0b87fc98b306ae3366f0e0a88d0b06a2813313" { | ||
| return nil, fmt.Errorf("invalid common key from otp") | ||
| } | ||
| return commonKey, nil | ||
| } | ||
| fmt.Print("Common key not found. Enter it here: ") | ||
| var inputKey string | ||
| fmt.Scanln(&inputKey) | ||
| commonKey, err := hex.DecodeString(strings.TrimSpace(inputKey)) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| commonKeyHash := sha1.Sum(commonKey) | ||
| if hex.EncodeToString(commonKeyHash[:]) != "6a0b87fc98b306ae3366f0e0a88d0b06a2813313" { | ||
| return nil, fmt.Errorf("invalid common key") | ||
| } | ||
| return commonKey, nil | ||
| } | ||
|
|
||
| func fileExists(filename string) bool { | ||
| info, err := os.Stat(filename) | ||
| if os.IsNotExist(err) { | ||
| return false | ||
| } | ||
| return !info.IsDir() | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,109 @@ | ||
| package mlcrestorerdownloader | ||
|
|
||
| import ( | ||
| "crypto/aes" | ||
| "crypto/cipher" | ||
| "crypto/sha1" | ||
| "fmt" | ||
| "os" | ||
| "reflect" | ||
| ) | ||
|
|
||
| func checkContentHashes(path string, commonKey []byte, 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) | ||
|
|
||
| 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) | ||
| } | ||
| encryptedFile, err := os.OpenFile(fmt.Sprintf("%s/%s.app", path, content.ID), os.O_RDONLY, 0) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to open encrypted file: %w", err) | ||
| } | ||
|
|
||
| h3Hash := sha1.Sum(h3Data) | ||
| if !equalSlices(h3Hash[:8], content.Hash[:8]) { | ||
| return fmt.Errorf("h3 Hash mismatch") | ||
| } | ||
|
|
||
| chunkCount := int(content.Size / 0x10000) | ||
| decryptedContent := make([]byte, content.Size) | ||
|
|
||
| h0HashNum := 0 | ||
| h1HashNum := 0 | ||
| h2HashNum := 0 | ||
| h3HashNum := 0 | ||
|
|
||
| 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) | ||
|
|
||
| h0Hashes := decryptedContent[0:0x140] | ||
| h1Hashes := decryptedContent[0x140:0x280] | ||
| h2Hashes := decryptedContent[0x280:0x3c0] | ||
|
|
||
| h1Hash := h1Hashes[(h1HashNum * 0x14):((h1HashNum + 1) * 0x14)] | ||
| h2Hash := h2Hashes[(h2HashNum * 0x14):((h2HashNum + 1) * 0x14)] | ||
| h3Hash := h3Data[(h3HashNum * 0x14):((h3HashNum + 1) * 0x14)] | ||
|
|
||
| h0HashesHash := sha1.Sum(h0Hashes) | ||
| h1HashesHash := sha1.Sum(h1Hashes) | ||
| h2HashesHash := sha1.Sum(h2Hashes) | ||
|
|
||
| if !reflect.DeepEqual(h0HashesHash[:], h1Hash) { | ||
| return fmt.Errorf("h0 Hashes Hash mismatch") | ||
| } | ||
| if !reflect.DeepEqual(h1HashesHash[:], h2Hash) { | ||
| return fmt.Errorf("h1 Hashes Hash mismatch") | ||
| } | ||
| if !reflect.DeepEqual(h2HashesHash[:], h3Hash) { | ||
| return fmt.Errorf("h2 Hashes Hash mismatch") | ||
| } | ||
| encryptedFile.Seek(0xFC00, 1) | ||
| h0HashNum++ | ||
| if h0HashNum >= 16 { | ||
| h0HashNum = 0 | ||
| h1HashNum++ | ||
| } | ||
| if h1HashNum >= 16 { | ||
| h1HashNum = 0 | ||
| h2HashNum++ | ||
| } | ||
| if h2HashNum >= 16 { | ||
| h2HashNum = 0 | ||
| h3HashNum++ | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| type contentInfo struct { | ||
| ID string | ||
| Size int64 | ||
| Hash []byte | ||
| } | ||
|
|
||
| func equalSlices(slice1, slice2 []byte) bool { | ||
| if len(slice1) != len(slice2) { | ||
| return false | ||
| } | ||
| for i := range slice1 { | ||
| if slice1[i] != slice2[i] { | ||
| return false | ||
| } | ||
| } | ||
| return true | ||
| } |