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-rw-r--r--internal/configfile/config_file.go36
1 files changed, 21 insertions, 15 deletions
diff --git a/internal/configfile/config_file.go b/internal/configfile/config_file.go
index 67d67f0..01e3b80 100644
--- a/internal/configfile/config_file.go
+++ b/internal/configfile/config_file.go
@@ -87,20 +87,23 @@ func CreateConfFile(filename string, password string, plaintextNames bool, logN
if aessiv {
cf.FeatureFlags = append(cf.FeatureFlags, knownFlags[FlagAESSIV])
}
-
- // Generate new random master key
- var key []byte
- if devrandom {
- key = randBytesDevRandom(cryptocore.KeyLen)
- } else {
- key = cryptocore.RandBytes(cryptocore.KeyLen)
+ {
+ // Generate new random master key
+ var key []byte
+ if devrandom {
+ key = randBytesDevRandom(cryptocore.KeyLen)
+ } else {
+ key = cryptocore.RandBytes(cryptocore.KeyLen)
+ }
+ // Encrypt it using the password
+ // This sets ScryptObject and EncryptedKey
+ // Note: this looks at the FeatureFlags, so call it AFTER setting them.
+ cf.EncryptKey(key, password, logN)
+ for i := range key {
+ key[i] = 0
+ }
+ // key runs out of scope here
}
-
- // Encrypt it using the password
- // This sets ScryptObject and EncryptedKey
- // Note: this looks at the FeatureFlags, so call it AFTER setting them.
- cf.EncryptKey(key, password, logN)
-
// Write file to disk
return cf.WriteFile()
}
@@ -197,14 +200,17 @@ func LoadConfFile(filename string, password string) ([]byte, *ConfFile, error) {
// Uses scrypt with cost parameter logN and stores the scrypt parameters in
// cf.ScryptObject.
func (cf *ConfFile) EncryptKey(key []byte, password string, logN int) {
- // Generate derived key from password
+ // Generate scrypt-derived key from password
cf.ScryptObject = NewScryptKDF(logN)
scryptHash := cf.ScryptObject.DeriveKey(password)
-
// Lock master key using password-based key
useHKDF := cf.IsFeatureFlagSet(FlagHKDF)
ce := getKeyEncrypter(scryptHash, useHKDF)
cf.EncryptedKey = ce.EncryptBlock(key, 0, nil)
+ // Purge scrypt-derived key
+ for i := range scryptHash {
+ scryptHash[i] = 0
+ }
}
// WriteFile - write out config in JSON format to file "filename.tmp"