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dpapi.go
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dpapi.go
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package dpapi
import (
"encoding/base64"
"unsafe"
"github.com/pkg/errors"
"golang.org/x/sys/windows"
)
type cryptProtect uint32
const (
cryptProtectUIForbidden cryptProtect = 0x1
cryptProtectLocalMachine cryptProtect = 0x4
)
var (
dllcrypt32 = windows.NewLazySystemDLL("Crypt32.dll")
procEncryptData = dllcrypt32.NewProc("CryptProtectData")
procDecryptData = dllcrypt32.NewProc("CryptUnprotectData")
)
type dataBlob struct {
cbData uint32
pbData *byte
}
func newBlob(d []byte) *dataBlob {
if len(d) == 0 {
return &dataBlob{}
}
return &dataBlob{
pbData: &d[0],
cbData: uint32(len(d)),
}
}
func (b *dataBlob) toByteArray() []byte {
d := make([]byte, b.cbData)
/* #nosec# G103 */
copy(d, (*[1 << 30]byte)(unsafe.Pointer(b.pbData))[:])
return d
}
func (b *dataBlob) zeroMemory() {
zeros := make([]byte, b.cbData)
/* #nosec# G103 */
copy((*[1 << 30]byte)(unsafe.Pointer(b.pbData))[:], zeros)
}
func (b *dataBlob) free() error {
/* #nosec# G103 */
_, err := windows.LocalFree(windows.Handle(unsafe.Pointer(b.pbData)))
if err != nil {
return errors.Wrap(err, "localfree")
}
return nil
}
// Encrypt a string value to a base64 string
func Encrypt(secret string) (string, error) {
return encrypt(secret, "", cryptProtectUIForbidden)
}
func EncryptEntropy(secret, entropy string) (string, error) {
return encrypt(secret, entropy, cryptProtectUIForbidden)
}
func encrypt(secret, entropy string, cf cryptProtect) (string, error) {
var result string
var b []byte
b, err := encryptBytes([]byte(secret), []byte(entropy), cf)
if err != nil {
return result, errors.Wrap(err, "encryptbytes")
}
result = base64.StdEncoding.EncodeToString(b)
return result, nil
}
// EncryptBytes encrypts a byte array and returns a byte array
func EncryptBytes(data []byte) ([]byte, error) {
return encryptBytes(data, nil, cryptProtectUIForbidden)
}
func EncryptBytesEntropy(data, entropy []byte) ([]byte, error) {
return encryptBytes(data, entropy, cryptProtectUIForbidden)
}
func encryptBytes(data []byte, entropy []byte, cf cryptProtect) ([]byte, error) {
var (
outblob dataBlob
r uintptr
err error
)
if len(entropy) > 0 {
/* #nosec# G103 */
r, _, err = procEncryptData.Call(uintptr(unsafe.Pointer(newBlob(data))), 0, uintptr(unsafe.Pointer(newBlob(entropy))), 0, 0, uintptr(cf), uintptr(unsafe.Pointer(&outblob)))
} else {
/* #nosec# G103 */
r, _, err = procEncryptData.Call(uintptr(unsafe.Pointer(newBlob(data))), 0, 0, 0, 0, uintptr(cf), uintptr(unsafe.Pointer(&outblob)))
}
if r == 0 {
return nil, errors.Wrap(err, "procencryptdata")
}
enc := outblob.toByteArray()
return enc, outblob.free()
}
// EncryptBytesMachineLocal encrypts a byte array and returns a byte array and associates the data
// encrypted with the current computer instead of with an individual user.
func EncryptBytesMachineLocal(data []byte) ([]byte, error) {
return encryptBytes(data, nil, cryptProtectUIForbidden|cryptProtectLocalMachine)
}
func EncryptBytesMachineLocalEntropy(data, entropy []byte) ([]byte, error) {
return encryptBytes(data, entropy, cryptProtectUIForbidden|cryptProtectLocalMachine)
}
// EncryptMachineLocal a string value to a base64 string and associates the data encrypted with the
// current computer instead of with an individual user.
func EncryptMachineLocal(secret string) (string, error) {
return encrypt(secret, "", cryptProtectUIForbidden|cryptProtectLocalMachine)
}
func EncryptMachineLocalEntropy(secret, entropy string) (string, error) {
return encrypt(secret, entropy, cryptProtectUIForbidden|cryptProtectLocalMachine)
}
// DecryptBytes decrypts a byte array returning a byte array
func decryptBytes(data, entropy []byte, cf cryptProtect) ([]byte, error) {
var (
outblob dataBlob
r uintptr
err error
)
if len(entropy) > 0 {
/* #nosec# G103 */
r, _, err = procDecryptData.Call(uintptr(unsafe.Pointer(newBlob(data))), 0, uintptr(unsafe.Pointer(newBlob(entropy))), 0, 0, uintptr(cf), uintptr(unsafe.Pointer(&outblob)))
} else {
/* #nosec# G103 */
r, _, err = procDecryptData.Call(uintptr(unsafe.Pointer(newBlob(data))), 0, 0, 0, 0, uintptr(cf), uintptr(unsafe.Pointer(&outblob)))
}
if r == 0 {
return nil, errors.Wrap(err, "procdecryptdata")
}
dec := outblob.toByteArray()
outblob.zeroMemory()
return dec, outblob.free()
}
// Decrypt a string to a string
func Decrypt(data string) (string, error) {
return DecryptEntropy(data, "")
}
// EncryptBytes encrypts a byte array and returns a byte array
func DecryptBytes(data []byte) ([]byte, error) {
return decryptBytes(data, nil, cryptProtectUIForbidden)
}
func DecryptBytesEntropy(data, entropy []byte) ([]byte, error) {
return decryptBytes(data, entropy, cryptProtectUIForbidden)
}
func DecryptEntropy(data, entropy string) (string, error) {
raw, err := base64.StdEncoding.DecodeString(data)
if err != nil {
return "", errors.Wrap(err, "decodestring")
}
b, err := decryptBytes(raw, []byte(entropy), cryptProtectUIForbidden)
if err != nil {
return "", errors.Wrap(err, "decryptbytes")
}
return string(b), nil
}