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cmd/utils, crypto: add --lightkdf flag for lighter KDF

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This commit is contained in:
Drake Burroughs
2015-10-23 16:49:36 +02:00
parent 6b5a42a15c
commit 05ea8926c3
7 changed files with 41 additions and 22 deletions
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35
crypto/key_store_passphrase.go
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@ -45,19 +45,29 @@ import (
const (
keyHeaderKDF = "scrypt"
// 2^18 / 8 / 1 uses 256MB memory and approx 1s CPU time on a modern CPU.
scryptN = 1 << 18
scryptr = 8
scryptp = 1
scryptdkLen = 32
// n,r,p = 2^18, 8, 1 uses 256MB memory and approx 1s CPU time on a modern CPU.
StandardScryptN = 1 << 18
StandardScryptP = 1
// n,r,p = 2^12, 8, 6 uses 4MB memory and approx 100ms CPU time on a modern CPU.
LightScryptN = 1 << 12
LightScryptP = 6
scryptR = 8
scryptDKLen = 32
)
type keyStorePassphrase struct {
keysDirPath string
scryptN int
scryptP int
scryptR int
scryptDKLen int
}
func NewKeyStorePassphrase(path string) KeyStore {
return &keyStorePassphrase{path}
func NewKeyStorePassphrase(path string, scryptN int, scryptP int) KeyStore {
return &keyStorePassphrase{path, scryptN, scryptP, scryptR, scryptDKLen}
}
func (ks keyStorePassphrase) GenerateNewKey(rand io.Reader, auth string) (key *Key, err error) {
@ -87,11 +97,10 @@ func (ks keyStorePassphrase) GetKeyAddresses() (addresses []common.Address, err
func (ks keyStorePassphrase) StoreKey(key *Key, auth string) (err error) {
authArray := []byte(auth)
salt := randentropy.GetEntropyCSPRNG(32)
derivedKey, err := scrypt.Key(authArray, salt, scryptN, scryptr, scryptp, scryptdkLen)
derivedKey, err := scrypt.Key(authArray, salt, ks.scryptN, ks.scryptR, ks.scryptP, ks.scryptDKLen)
if err != nil {
return err
}
encryptKey := derivedKey[:16]
keyBytes := FromECDSA(key.PrivateKey)
@ -104,10 +113,10 @@ func (ks keyStorePassphrase) StoreKey(key *Key, auth string) (err error) {
mac := Sha3(derivedKey[16:32], cipherText)
scryptParamsJSON := make(map[string]interface{}, 5)
scryptParamsJSON["n"] = scryptN
scryptParamsJSON["r"] = scryptr
scryptParamsJSON["p"] = scryptp
scryptParamsJSON["dklen"] = scryptdkLen
scryptParamsJSON["n"] = ks.scryptN
scryptParamsJSON["r"] = ks.scryptR
scryptParamsJSON["p"] = ks.scryptP
scryptParamsJSON["dklen"] = ks.scryptDKLen
scryptParamsJSON["salt"] = hex.EncodeToString(salt)
cipherParamsJSON := cipherparamsJSON{