765 lines
24 KiB
Nim
765 lines
24 KiB
Nim
# beacon_chain
|
|
# Copyright (c) 2018-2020 Status Research & Development GmbH
|
|
# Licensed and distributed under either of
|
|
# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
|
|
# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
|
|
# at your option. This file may not be copied, modified, or distributed except according to those terms.
|
|
|
|
import
|
|
# Standard library
|
|
std/[algorithm, math, parseutils, strformat, strutils, typetraits, unicode],
|
|
# Third-party libraries
|
|
normalize,
|
|
# Status libraries
|
|
stew/[results, bitseqs, bitops2], stew/shims/macros,
|
|
bearssl, eth/keyfile/uuid, blscurve, json_serialization,
|
|
nimcrypto/[sha2, rijndael, pbkdf2, bcmode, hash, scrypt],
|
|
# Local modules
|
|
libp2p/crypto/crypto as lcrypto,
|
|
./datatypes, ./crypto, ./digest, ./signatures
|
|
|
|
# We use `ncrutils` for constant-time hexadecimal encoding/decoding procedures.
|
|
import nimcrypto/utils as ncrutils
|
|
|
|
export
|
|
results, burnMem, writeValue, readValue
|
|
|
|
{.push raises: [Defect].}
|
|
{.localPassC: "-fno-lto".} # no LTO for crypto
|
|
|
|
type
|
|
ChecksumFunctionKind* = enum
|
|
sha256Checksum = "sha256"
|
|
|
|
Sha256Params* = object
|
|
Sha256Digest* = MDigest[256]
|
|
|
|
ChecksumBytes* = distinct seq[byte]
|
|
|
|
Checksum* = object
|
|
case function*: ChecksumFunctionKind
|
|
of sha256Checksum:
|
|
params*: Sha256Params
|
|
message*: Sha256Digest
|
|
|
|
Aes128CtrIv* = distinct seq[byte]
|
|
|
|
Aes128CtrParams* = object
|
|
iv*: Aes128CtrIv
|
|
|
|
CipherFunctionKind* = enum
|
|
aes128CtrCipher = "aes-128-ctr"
|
|
|
|
CipherBytes* = distinct seq[byte]
|
|
|
|
Cipher* = object
|
|
case function*: CipherFunctionKind
|
|
of aes128ctrCipher:
|
|
params*: Aes128CtrParams
|
|
message*: CipherBytes
|
|
|
|
KdfKind* = enum
|
|
kdfPbkdf2 = "pbkdf2"
|
|
kdfScrypt = "scrypt"
|
|
|
|
ScryptSalt* = distinct seq[byte]
|
|
|
|
ScryptParams* = object
|
|
dklen: uint64
|
|
n, p, r: int
|
|
salt: ScryptSalt
|
|
|
|
Pbkdf2Salt* = distinct seq[byte]
|
|
|
|
PrfKind* = enum # Pseudo-random-function Kind
|
|
HmacSha256 = "hmac-sha256"
|
|
|
|
Pbkdf2Params* = object
|
|
dklen*: uint64
|
|
c*: uint64
|
|
prf*: PrfKind
|
|
salt*: Pbkdf2Salt
|
|
|
|
DecryptionStatus* = enum
|
|
Success = "Success"
|
|
InvalidPassword = "Invalid password"
|
|
InvalidKeystore = "Invalid keystore"
|
|
|
|
# https://github.com/ethereum/EIPs/blob/4494da0966afa7318ec0157948821b19c4248805/EIPS/eip-2386.md#specification
|
|
Wallet* = object
|
|
uuid*: UUID
|
|
name*: WalletName
|
|
version*: uint
|
|
walletType* {.serializedFieldName: "type"}: string
|
|
# TODO: The use of `JsonString` can be removed once we
|
|
# solve the serialization problem for `Crypto[T]`
|
|
crypto*: Crypto
|
|
nextAccount* {.serializedFieldName: "nextaccount".}: Natural
|
|
|
|
Kdf* = object
|
|
case function*: KdfKind
|
|
of kdfPbkdf2:
|
|
pbkdf2Params* {.serializedFieldName: "params".}: Pbkdf2Params
|
|
of kdfScrypt:
|
|
scryptParams* {.serializedFieldName: "params".}: ScryptParams
|
|
message*: string
|
|
|
|
Crypto* = object
|
|
kdf*: Kdf
|
|
checksum*: Checksum
|
|
cipher*: Cipher
|
|
|
|
Keystore* = object
|
|
crypto*: Crypto
|
|
description*: ref string
|
|
pubkey*: ValidatorPubKey
|
|
path*: KeyPath
|
|
uuid*: string
|
|
version*: int
|
|
|
|
NetKeystore* = object
|
|
crypto*: Crypto
|
|
description*: ref string
|
|
pubkey*: lcrypto.PublicKey
|
|
uuid*: string
|
|
version*: int
|
|
|
|
KsResult*[T] = Result[T, string]
|
|
|
|
Eth2KeyKind* = enum
|
|
signingKeyKind # Also known as voting key
|
|
withdrawalKeyKind
|
|
|
|
UUID* = distinct string
|
|
WalletName* = distinct string
|
|
Mnemonic* = distinct string
|
|
KeyPath* = distinct string
|
|
KeySeed* = distinct seq[byte]
|
|
KeystorePass* = object
|
|
str*: string
|
|
|
|
Credentials* = object
|
|
mnemonic*: Mnemonic
|
|
keystore*: Keystore
|
|
signingKey*: ValidatorPrivKey
|
|
withdrawalKey*: ValidatorPrivKey
|
|
|
|
SensitiveStrings = Mnemonic|KeySeed
|
|
SimpleHexEncodedTypes = ScryptSalt|ChecksumBytes|CipherBytes
|
|
|
|
const
|
|
keyLen = 32
|
|
|
|
scryptParams = ScryptParams(
|
|
dklen: uint64 keyLen,
|
|
n: 2^18,
|
|
p: 1,
|
|
r: 8
|
|
)
|
|
|
|
pbkdf2Params = Pbkdf2Params(
|
|
dklen: uint64 keyLen,
|
|
c: uint64(2^18),
|
|
prf: HmacSha256
|
|
)
|
|
|
|
# https://eips.ethereum.org/EIPS/eip-2334
|
|
eth2KeyPurpose = 12381
|
|
eth2CoinType* = 3600
|
|
|
|
# https://github.com/bitcoin/bips/blob/master/bip-0039/bip-0039-wordlists.md
|
|
wordListLen = 2048
|
|
maxWordLen = 16
|
|
|
|
UUID.serializesAsBaseIn Json
|
|
KeyPath.serializesAsBaseIn Json
|
|
WalletName.serializesAsBaseIn Json
|
|
|
|
ChecksumFunctionKind.serializesAsTextInJson
|
|
CipherFunctionKind.serializesAsTextInJson
|
|
PrfKind.serializesAsTextInJson
|
|
KdfKind.serializesAsTextInJson
|
|
|
|
template `$`*(m: Mnemonic): string =
|
|
string(m)
|
|
|
|
template `==`*(lhs, rhs: WalletName): bool =
|
|
string(lhs) == string(rhs)
|
|
|
|
template `$`*(x: WalletName): string =
|
|
string(x)
|
|
|
|
template burnMem*(m: var (SensitiveStrings|TaintedString)) =
|
|
# TODO: `burnMem` in nimcrypto could use distinctBase
|
|
# to make its usage less error-prone.
|
|
ncrutils.burnMem(string m)
|
|
|
|
template burnMem*(m: var KeystorePass) =
|
|
# TODO: `burnMem` in nimcrypto could use distinctBase
|
|
# to make its usage less error-prone.
|
|
ncrutils.burnMem(m.str)
|
|
|
|
func longName*(wallet: Wallet): string =
|
|
if wallet.name.string == wallet.uuid.string:
|
|
wallet.name.string
|
|
else:
|
|
wallet.name.string & " (" & wallet.uuid.string & ")"
|
|
|
|
proc getRandomBytes*(rng: var BrHmacDrbgContext, n: Natural): seq[byte]
|
|
{.raises: [Defect].} =
|
|
result = newSeq[byte](n)
|
|
brHmacDrbgGenerate(rng, result)
|
|
|
|
macro wordListArray*(filename: static string,
|
|
maxWords: static int = 0,
|
|
minWordLen: static int = 0,
|
|
maxWordLen: static int = high(int)): untyped =
|
|
result = newTree(nnkBracket)
|
|
var words = slurp(filename).splitLines()
|
|
for word in words:
|
|
if word.len >= minWordLen and word.len <= maxWordLen:
|
|
result.add newCall("cstring", newLit(word))
|
|
if maxWords > 0 and result.len >= maxWords:
|
|
return
|
|
|
|
const
|
|
englishWords = wordListArray("english_word_list.txt",
|
|
maxWords = wordListLen,
|
|
maxWordLen = maxWordLen)
|
|
englishWordsDigest =
|
|
"AD90BF3BEB7B0EB7E5ACD74727DC0DA96E0A280A258354E7293FB7E211AC03DB".toDigest
|
|
|
|
proc checkEnglishWords(): bool =
|
|
if len(englishWords) != wordListLen:
|
|
false
|
|
else:
|
|
var ctx: sha256
|
|
ctx.init()
|
|
for item in englishWords:
|
|
ctx.update($item)
|
|
ctx.finish() == englishWordsDigest
|
|
|
|
static:
|
|
doAssert(checkEnglishWords(), "English words array is corrupted!")
|
|
|
|
func append*(path: KeyPath, pathNode: Natural): KeyPath =
|
|
KeyPath(path.string & "/" & $pathNode)
|
|
|
|
func validateKeyPath*(path: TaintedString): Result[KeyPath, cstring] =
|
|
var digitCount: int
|
|
var number: BiggestUint
|
|
try:
|
|
for elem in path.string.split("/"):
|
|
# TODO: doesn't "m" have to be the first character and is it the only
|
|
# place where it is valid?
|
|
if elem == "m":
|
|
continue
|
|
# parseBiggestUInt can raise if overflow
|
|
digitCount = elem.parseBiggestUInt(number)
|
|
if digitCount == 0:
|
|
return err("Invalid derivation path")
|
|
except ValueError:
|
|
return err("KeyPath contains invalid number(s)")
|
|
|
|
return ok(KeyPath path)
|
|
|
|
iterator pathNodes(path: KeyPath): Natural =
|
|
# TODO: we have exceptions there
|
|
# and this iterator is used to derive secret keys
|
|
# if we fail we want to scrub secrets from memory
|
|
try:
|
|
for elem in path.string.split("/"):
|
|
if elem == "m": continue
|
|
yield parseBiggestUInt(elem)
|
|
except ValueError:
|
|
doAssert false, "Make sure you've validated the key path with `validateKeyPath`"
|
|
|
|
func makeKeyPath*(validatorIdx: Natural,
|
|
keyType: Eth2KeyKind): KeyPath =
|
|
# https://eips.ethereum.org/EIPS/eip-2334
|
|
let use = case keyType
|
|
of withdrawalKeyKind: "0"
|
|
of signingKeyKind: "0/0"
|
|
|
|
try:
|
|
KeyPath &"m/{eth2KeyPurpose}/{eth2CoinType}/{validatorIdx}/{use}"
|
|
except ValueError:
|
|
raiseAssert "All values above can be converted successfully to strings"
|
|
|
|
func isControlRune(r: Rune): bool =
|
|
let r = int r
|
|
(r >= 0 and r < 0x20) or (r >= 0x7F and r < 0xA0)
|
|
|
|
proc init*(T: type KeystorePass, input: string): T =
|
|
for rune in toNFKD(input):
|
|
if not isControlRune(rune):
|
|
result.str.add rune
|
|
|
|
func getSeed*(mnemonic: Mnemonic, password: KeystorePass): KeySeed =
|
|
# https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki#from-mnemonic-to-seed
|
|
let salt = toNFKD("mnemonic" & password.str)
|
|
KeySeed sha512.pbkdf2(mnemonic.string, salt, 2048, 64)
|
|
|
|
template add(m: var Mnemonic, s: cstring) =
|
|
m.string.add s
|
|
|
|
proc generateMnemonic*(
|
|
rng: var BrHmacDrbgContext,
|
|
words: openarray[cstring] = englishWords,
|
|
entropyParam: openarray[byte] = @[]): Mnemonic =
|
|
## Generates a valid BIP-0039 mnenomic:
|
|
## https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki#generating-the-mnemonic
|
|
var entropy: seq[byte]
|
|
if entropyParam.len == 0:
|
|
setLen(entropy, 32)
|
|
brHmacDrbgGenerate(rng, entropy)
|
|
else:
|
|
doAssert entropyParam.len >= 128 and
|
|
entropyParam.len <= 256 and
|
|
entropyParam.len mod 32 == 0
|
|
entropy = @entropyParam
|
|
|
|
let
|
|
checksumBits = entropy.len div 4 # ranges from 4 to 8
|
|
mnemonicWordCount = 12 + (checksumBits - 4) * 3
|
|
checksum = sha256.digest(entropy)
|
|
|
|
entropy.add byte(checksum.data.getBitsBE(0 ..< checksumBits))
|
|
|
|
# Make sure the string won't be reallocated as this may
|
|
# leave partial copies of the mnemonic in memory:
|
|
result = Mnemonic newStringOfCap(mnemonicWordCount * maxWordLen)
|
|
result.add words[entropy.getBitsBE(0..10)]
|
|
|
|
for i in 1 ..< mnemonicWordCount:
|
|
let
|
|
firstBit = i*11
|
|
lastBit = firstBit + 10
|
|
result.add " "
|
|
result.add words[entropy.getBitsBE(firstBit..lastBit)]
|
|
|
|
proc cmpIgnoreCase(lhs: cstring, rhs: string): int =
|
|
# TODO: This is a bit silly.
|
|
# Nim should have a `cmp` function for C strings.
|
|
cmpIgnoreCase($lhs, rhs)
|
|
|
|
proc validateMnemonic*(inputWords: TaintedString,
|
|
outputMnemonic: var Mnemonic): bool =
|
|
## Accept a case-insensitive input string and returns `true`
|
|
## if it represents a valid mnenomic. The `outputMnemonic`
|
|
## value will be populated with a normalized lower-case
|
|
## version of the mnemonic using a single space separator.
|
|
##
|
|
## The `outputMnemonic` value may be populated partially
|
|
## with sensitive data even in case of validator failure.
|
|
## Make sure to burn the received data after usage.
|
|
|
|
let words = strutils.strip(inputWords.string.toNFKD).split(Whitespace)
|
|
if words.len < 12 or words.len > 24 or words.len mod 3 != 0:
|
|
return false
|
|
|
|
# Make sure the string won't be re-allocated as this may
|
|
# leave partial copies of the mnemonic in memory:
|
|
outputMnemonic = Mnemonic newStringOfCap(words.len * maxWordLen)
|
|
|
|
for word in words:
|
|
let foundIdx = binarySearch(englishWords, word, cmpIgnoreCase)
|
|
if foundIdx == -1:
|
|
return false
|
|
if outputMnemonic.string.len > 0:
|
|
outputMnemonic.add " "
|
|
outputMnemonic.add englishWords[foundIdx]
|
|
|
|
return true
|
|
|
|
proc deriveChildKey*(parentKey: ValidatorPrivKey,
|
|
index: Natural): ValidatorPrivKey =
|
|
let success = derive_child_secretKey(SecretKey result,
|
|
SecretKey parentKey,
|
|
uint32 index)
|
|
# TODO `derive_child_secretKey` is reporting pre-condition
|
|
# failures with return values. We should turn the checks
|
|
# into asserts inside the function.
|
|
doAssert success
|
|
|
|
proc deriveMasterKey*(seed: KeySeed): ValidatorPrivKey =
|
|
let success = derive_master_secretKey(SecretKey result,
|
|
seq[byte] seed)
|
|
# TODO `derive_master_secretKey` is reporting pre-condition
|
|
# failures with return values. We should turn the checks
|
|
# into asserts inside the function.
|
|
doAssert success
|
|
|
|
proc deriveMasterKey*(mnemonic: Mnemonic,
|
|
password: KeystorePass): ValidatorPrivKey =
|
|
deriveMasterKey(getSeed(mnemonic, password))
|
|
|
|
proc deriveChildKey*(masterKey: ValidatorPrivKey,
|
|
path: KeyPath): ValidatorPrivKey =
|
|
result = masterKey
|
|
for idx in pathNodes(path):
|
|
# TODO: we have exceptions in pathNodes unless `validateKeyPath`
|
|
# was called,
|
|
# and this iterator is used to derive secret keys
|
|
# if we fail we want to scrub secrets from memory
|
|
result = deriveChildKey(result, idx)
|
|
|
|
proc keyFromPath*(mnemonic: Mnemonic,
|
|
password: KeystorePass,
|
|
path: KeyPath): ValidatorPrivKey =
|
|
deriveChildKey(deriveMasterKey(mnemonic, password), path)
|
|
|
|
proc shaChecksum(key, cipher: openarray[byte]): Sha256Digest =
|
|
var ctx: sha256
|
|
ctx.init()
|
|
ctx.update(key)
|
|
ctx.update(cipher)
|
|
result = ctx.finish()
|
|
ctx.clear()
|
|
|
|
proc writeJsonHexString(s: OutputStream, data: openarray[byte])
|
|
{.raises: [IOError, Defect].} =
|
|
s.write '"'
|
|
s.write ncrutils.toHex(data, {HexFlags.LowerCase})
|
|
s.write '"'
|
|
|
|
proc readValue*(r: var JsonReader, value: var Pbkdf2Salt)
|
|
{.raises: [SerializationError, IOError, Defect].} =
|
|
var s = r.readValue(string)
|
|
|
|
if s.len == 0 or s.len mod 16 != 0:
|
|
r.raiseUnexpectedValue(
|
|
"The Pbkdf2Salt salt must have a non-zero length divisible by 16")
|
|
|
|
value = Pbkdf2Salt ncrutils.fromHex(s)
|
|
let length = len(seq[byte](value))
|
|
if length == 0 or (length mod 8) != 0:
|
|
r.raiseUnexpectedValue(
|
|
"The Pbkdf2Salt must be a valid hex string")
|
|
|
|
proc readValue*(r: var JsonReader, value: var Aes128CtrIv)
|
|
{.raises: [SerializationError, IOError, Defect].} =
|
|
var s = r.readValue(string)
|
|
|
|
if s.len != 32:
|
|
r.raiseUnexpectedValue(
|
|
"The aes-128-ctr IV must be a string of length 32")
|
|
|
|
value = Aes128CtrIv ncrutils.fromHex(s)
|
|
if len(seq[byte](value)) != 16:
|
|
r.raiseUnexpectedValue(
|
|
"The aes-128-ctr IV must be a valid hex string")
|
|
|
|
proc readValue*[T: SimpleHexEncodedTypes](r: var JsonReader, value: var T)
|
|
{.raises: [SerializationError, IOError, Defect].} =
|
|
value = T ncrutils.fromHex(r.readValue(string))
|
|
if len(seq[byte](value)) == 0:
|
|
r.raiseUnexpectedValue("Valid hex string expected")
|
|
|
|
proc readValue*(r: var JsonReader, value: var Kdf)
|
|
{.raises: [SerializationError, IOError, Defect].} =
|
|
var
|
|
functionSpecified = false
|
|
paramsSpecified = false
|
|
|
|
for fieldName in readObjectFields(r):
|
|
case fieldName
|
|
of "function":
|
|
value.function = r.readValue(KdfKind)
|
|
functionSpecified = true
|
|
|
|
of "params":
|
|
if functionSpecified:
|
|
case value.function
|
|
of kdfPbkdf2:
|
|
r.readValue(value.pbkdf2Params)
|
|
of kdfScrypt:
|
|
r.readValue(value.scryptParams)
|
|
else:
|
|
r.raiseUnexpectedValue(
|
|
"The 'params' field must be specified after the 'function' field")
|
|
paramsSpecified = true
|
|
|
|
of "message":
|
|
r.readValue(value.message)
|
|
|
|
else:
|
|
r.raiseUnexpectedField(fieldName, "Kdf")
|
|
|
|
if not (functionSpecified and paramsSpecified):
|
|
r.raiseUnexpectedValue(
|
|
"The Kdf value should have sub-fields named 'function' and 'params'")
|
|
|
|
template writeValue*(w: var JsonWriter,
|
|
value: Pbkdf2Salt|SimpleHexEncodedTypes|Aes128CtrIv) =
|
|
writeJsonHexString(w.stream, distinctBase value)
|
|
|
|
template bytes(value: Pbkdf2Salt|SimpleHexEncodedTypes|Aes128CtrIv): seq[byte] =
|
|
distinctBase value
|
|
|
|
func scrypt(password: openArray[char], salt: openArray[byte],
|
|
N, r, p, keyLen: static[int]): array[keyLen, byte] =
|
|
let (xyvLen, bLen) = scryptCalc(N, r, p)
|
|
var xyv = newSeq[uint32](xyvLen)
|
|
var b = newSeq[byte](bLen)
|
|
discard scrypt(password, salt, N, r, p, xyv, b, result)
|
|
|
|
func areValid(params: Pbkdf2Params): bool =
|
|
# https://www.ietf.org/rfc/rfc2898.txt
|
|
if params.c == 0 or params.dkLen == 0 or params.salt.bytes.len == 0:
|
|
return false
|
|
|
|
let hLen = case params.prf
|
|
of HmacSha256: 256 / 8
|
|
|
|
params.dklen <= high(uint32).uint64 * hLen.uint64
|
|
|
|
func areValid(params: ScryptParams): bool =
|
|
params.dklen == scryptParams.dklen and
|
|
params.n == scryptParams.n and
|
|
params.r == scryptParams.r and
|
|
params.p == scryptParams.p and
|
|
params.salt.bytes.len > 0
|
|
|
|
proc decryptCryptoField*(crypto: Crypto,
|
|
password: KeystorePass,
|
|
outSecret: var seq[byte]): DecryptionStatus =
|
|
if crypto.cipher.message.bytes.len == 0:
|
|
return InvalidKeystore
|
|
|
|
let decKey = case crypto.kdf.function
|
|
of kdfPbkdf2:
|
|
template params: auto = crypto.kdf.pbkdf2Params
|
|
if not params.areValid or params.c > high(int).uint64:
|
|
return InvalidKeystore
|
|
sha256.pbkdf2(password.str,
|
|
params.salt.bytes,
|
|
int params.c,
|
|
int params.dklen)
|
|
of kdfScrypt:
|
|
template params: auto = crypto.kdf.scryptParams
|
|
if not params.areValid:
|
|
return InvalidKeystore
|
|
@(scrypt(password.str,
|
|
params.salt.bytes,
|
|
scryptParams.n,
|
|
scryptParams.r,
|
|
scryptParams.p,
|
|
int scryptParams.dklen))
|
|
|
|
let derivedChecksum = shaChecksum(decKey.toOpenArray(16, 31),
|
|
crypto.cipher.message.bytes)
|
|
if derivedChecksum != crypto.checksum.message:
|
|
return InvalidPassword
|
|
|
|
var aesCipher: CTR[aes128]
|
|
outSecret.setLen(crypto.cipher.message.bytes.len)
|
|
|
|
aesCipher.init(decKey.toOpenArray(0, 15), crypto.cipher.params.iv.bytes)
|
|
aesCipher.decrypt(crypto.cipher.message.bytes, outSecret)
|
|
aesCipher.clear()
|
|
|
|
return Success
|
|
|
|
func cstringToStr(v: cstring): string = $v
|
|
|
|
proc decryptKeystore*(keystore: Keystore,
|
|
password: KeystorePass): KsResult[ValidatorPrivKey] =
|
|
var secret: seq[byte]
|
|
defer: burnMem(secret)
|
|
let status = decryptCryptoField(keystore.crypto, password, secret)
|
|
case status
|
|
of Success:
|
|
ValidatorPrivKey.fromRaw(secret).mapErr(cstringToStr)
|
|
else:
|
|
err $status
|
|
|
|
proc decryptKeystore*(keystore: JsonString,
|
|
password: KeystorePass): KsResult[ValidatorPrivKey] =
|
|
let keystore = try: Json.decode(keystore.string, Keystore)
|
|
except SerializationError as e:
|
|
return err e.formatMsg("<keystore>")
|
|
decryptKeystore(keystore, password)
|
|
|
|
proc writeValue*(writer: var JsonWriter, value: lcrypto.PublicKey) {.
|
|
inline, raises: [IOError, Defect].} =
|
|
writer.writeValue(ncrutils.toHex(value.getBytes().get(),
|
|
{HexFlags.LowerCase}))
|
|
|
|
proc readValue*(reader: var JsonReader, value: var lcrypto.PublicKey) {.
|
|
raises: [SerializationError, IOError, Defect].} =
|
|
let res = init(lcrypto.PublicKey, reader.readValue(string))
|
|
if res.isOk():
|
|
value = res.get()
|
|
else:
|
|
# TODO: Can we provide better diagnostic?
|
|
raiseUnexpectedValue(reader, "Valid hex-encoded public key expected")
|
|
|
|
proc decryptNetKeystore*(nkeystore: NetKeystore,
|
|
password: KeystorePass): KsResult[lcrypto.PrivateKey] =
|
|
var secret: seq[byte]
|
|
defer: burnMem(secret)
|
|
let status = decryptCryptoField(nkeystore.crypto, password, secret)
|
|
case status
|
|
of Success:
|
|
let res = lcrypto.PrivateKey.init(secret)
|
|
if res.isOk:
|
|
ok res.get
|
|
else:
|
|
err "Invalid key"
|
|
else:
|
|
err $status
|
|
|
|
proc decryptNetKeystore*(nkeystore: JsonString,
|
|
password: KeystorePass): KsResult[lcrypto.PrivateKey] =
|
|
try:
|
|
let keystore = Json.decode(string(nkeystore), NetKeystore)
|
|
return decryptNetKeystore(keystore, password)
|
|
except SerializationError as exc:
|
|
return err(exc.formatMsg("<keystore>"))
|
|
|
|
proc createCryptoField(kdfKind: KdfKind,
|
|
rng: var BrHmacDrbgContext,
|
|
secret: openarray[byte],
|
|
password = KeystorePass.init "",
|
|
salt: openarray[byte] = @[],
|
|
iv: openarray[byte] = @[]): Crypto =
|
|
type AES = aes128
|
|
|
|
let kdfSalt =
|
|
if salt.len > 0:
|
|
doAssert salt.len == keyLen
|
|
@salt
|
|
else:
|
|
getRandomBytes(rng, keyLen)
|
|
|
|
let aesIv = if iv.len > 0:
|
|
doAssert iv.len == AES.sizeBlock
|
|
@iv
|
|
else:
|
|
getRandomBytes(rng, AES.sizeBlock)
|
|
|
|
var decKey: seq[byte]
|
|
let kdf = case kdfKind
|
|
of kdfPbkdf2:
|
|
decKey = sha256.pbkdf2(password.str,
|
|
kdfSalt,
|
|
int pbkdf2Params.c,
|
|
int pbkdf2Params.dklen)
|
|
var params = pbkdf2Params
|
|
params.salt = Pbkdf2Salt kdfSalt
|
|
Kdf(function: kdfPbkdf2, pbkdf2Params: params, message: "")
|
|
of kdfScrypt:
|
|
decKey = @(scrypt(password.str, kdfSalt,
|
|
scryptParams.n, scryptParams.r, scryptParams.p, keyLen))
|
|
var params = scryptParams
|
|
params.salt = ScryptSalt kdfSalt
|
|
Kdf(function: kdfScrypt, scryptParams: params, message: "")
|
|
|
|
var
|
|
aesCipher: CTR[AES]
|
|
cipherMsg = newSeq[byte](secret.len)
|
|
|
|
aesCipher.init(decKey.toOpenArray(0, 15), aesIv)
|
|
aesCipher.encrypt(secret, cipherMsg)
|
|
aesCipher.clear()
|
|
|
|
let sum = shaChecksum(decKey.toOpenArray(16, 31), cipherMsg)
|
|
|
|
Crypto(
|
|
kdf: kdf,
|
|
checksum: Checksum(
|
|
function: sha256Checksum,
|
|
message: sum),
|
|
cipher: Cipher(
|
|
function: aes128CtrCipher,
|
|
params: Aes128CtrParams(iv: Aes128CtrIv aesIv),
|
|
message: CipherBytes cipherMsg))
|
|
|
|
proc createNetKeystore*(kdfKind: KdfKind,
|
|
rng: var BrHmacDrbgContext,
|
|
privKey: lcrypto.PrivateKey,
|
|
password = KeystorePass.init "",
|
|
description = "",
|
|
salt: openarray[byte] = @[],
|
|
iv: openarray[byte] = @[]): NetKeystore =
|
|
let
|
|
secret = privKey.getBytes().get()
|
|
cryptoField = createCryptoField(kdfKind, rng, secret, password, salt, iv)
|
|
pubKey = privKey.getKey().get()
|
|
uuid = uuidGenerate().expect("Random bytes should be available")
|
|
|
|
NetKeystore(
|
|
crypto: cryptoField,
|
|
pubkey: pubKey,
|
|
description: newClone(description),
|
|
uuid: $uuid,
|
|
version: 1
|
|
)
|
|
|
|
proc createKeystore*(kdfKind: KdfKind,
|
|
rng: var BrHmacDrbgContext,
|
|
privKey: ValidatorPrivkey,
|
|
password = KeystorePass.init "",
|
|
path = KeyPath "",
|
|
description = "",
|
|
salt: openarray[byte] = @[],
|
|
iv: openarray[byte] = @[]): Keystore =
|
|
let
|
|
secret = privKey.toRaw[^32..^1]
|
|
cryptoField = createCryptoField(kdfKind, rng, secret, password, salt, iv)
|
|
pubkey = privKey.toPubKey()
|
|
uuid = uuidGenerate().expect("Random bytes should be available")
|
|
|
|
Keystore(
|
|
crypto: cryptoField,
|
|
pubkey: pubkey,
|
|
path: path,
|
|
description: newClone(description),
|
|
uuid: $uuid,
|
|
version: 4)
|
|
|
|
proc createWallet*(kdfKind: KdfKind,
|
|
rng: var BrHmacDrbgContext,
|
|
mnemonic: Mnemonic,
|
|
name = WalletName "",
|
|
salt: openarray[byte] = @[],
|
|
iv: openarray[byte] = @[],
|
|
password = KeystorePass.init "",
|
|
nextAccount = none(Natural),
|
|
pretty = true): Wallet =
|
|
let
|
|
uuid = UUID $(uuidGenerate().expect("Random bytes should be available"))
|
|
# Please note that we are passing an empty password here because
|
|
# we want the wallet restoration procedure to depend only on the
|
|
# mnemonic (the user is asked to treat the mnemonic as a password).
|
|
seed = getSeed(mnemonic, KeystorePass.init "")
|
|
crypto = createCryptoField(kdfKind, rng, distinctBase seed,
|
|
password, salt, iv)
|
|
Wallet(
|
|
uuid: uuid,
|
|
name: if name.string.len > 0: name
|
|
else: WalletName(uuid),
|
|
version: 1,
|
|
walletType: "hierarchical deterministic",
|
|
crypto: crypto,
|
|
nextAccount: nextAccount.get(0))
|
|
|
|
# https://github.com/ethereum/eth2.0-specs/blob/v0.12.2/specs/phase0/deposit-contract.md#withdrawal-credentials
|
|
proc makeWithdrawalCredentials*(k: ValidatorPubKey): Eth2Digest =
|
|
var bytes = eth2digest(k.toRaw())
|
|
bytes.data[0] = BLS_WITHDRAWAL_PREFIX.uint8
|
|
bytes
|
|
|
|
proc prepareDeposit*(preset: RuntimePreset,
|
|
withdrawalPubKey: ValidatorPubKey,
|
|
signingKey: ValidatorPrivKey, signingPubKey: ValidatorPubKey,
|
|
amount = MAX_EFFECTIVE_BALANCE.Gwei): DepositData =
|
|
var res = DepositData(
|
|
amount: amount,
|
|
pubkey: signingPubKey,
|
|
withdrawal_credentials: makeWithdrawalCredentials(withdrawalPubKey))
|
|
|
|
res.signature = preset.get_deposit_signature(res, signingKey)
|
|
return res
|