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70 lines
1.7 KiB
70 lines
1.7 KiB
package decrypt
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import (
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"crypto/aes"
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"crypto/cipher"
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"syscall"
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"unsafe"
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)
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func ChromePass(key, encryptPass []byte) ([]byte, error) {
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if len(encryptPass) > 15 {
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// remove Prefix 'v10'
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return aesGCMDecrypt(encryptPass[15:], key, encryptPass[3:15])
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} else {
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return nil, errPasswordIsEmpty
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}
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}
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// chromium > 80 https://source.chromium.org/chromium/chromium/src/+/master:components/os_crypt/os_crypt_win.cc
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func aesGCMDecrypt(crypted, key, nounce []byte) ([]byte, error) {
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, err
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}
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blockMode, err := cipher.NewGCM(block)
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if err != nil {
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return nil, err
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}
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origData, err := blockMode.Open(nil, nounce, crypted, nil)
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if err != nil {
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return nil, err
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}
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return origData, nil
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}
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type dataBlob struct {
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cbData uint32
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pbData *byte
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}
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func NewBlob(d []byte) *dataBlob {
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if len(d) == 0 {
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return &dataBlob{}
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}
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return &dataBlob{
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pbData: &d[0],
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cbData: uint32(len(d)),
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}
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}
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func (b *dataBlob) ToByteArray() []byte {
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d := make([]byte, b.cbData)
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copy(d, (*[1 << 30]byte)(unsafe.Pointer(b.pbData))[:])
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return d
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}
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// chrome < 80 https://chromium.googlesource.com/chromium/src/+/76f496a7235c3432983421402951d73905c8be96/components/os_crypt/os_crypt_win.cc#82
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func DPApi(data []byte) ([]byte, error) {
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dllCrypt := syscall.NewLazyDLL("Crypt32.dll")
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dllKernel := syscall.NewLazyDLL("Kernel32.dll")
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procDecryptData := dllCrypt.NewProc("CryptUnprotectData")
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procLocalFree := dllKernel.NewProc("LocalFree")
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var outBlob dataBlob
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r, _, err := procDecryptData.Call(uintptr(unsafe.Pointer(NewBlob(data))), 0, 0, 0, 0, 0, uintptr(unsafe.Pointer(&outBlob)))
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if r == 0 {
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return nil, err
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}
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defer procLocalFree.Call(uintptr(unsafe.Pointer(outBlob.pbData)))
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return outBlob.ToByteArray(), nil
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}
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