func main() {
var iban string
var r, s, t, st []string
u := new(big.Int)
v := new(big.Int)
w := new(big.Int)
iban = "GB82 TEST 1234 5698 7654 32"
r = strings.Split(iban, " ")
s = strings.Split(r[0], "")
t = strings.Split(r[1], "")
st = []string{strconv.Itoa(sCode[t[0]]),
strconv.Itoa(sCode[t[1]]),
strconv.Itoa(sCode[t[2]]),
strconv.Itoa(sCode[t[3]]),
strings.Join(r[2:6], ""),
strconv.Itoa(sCode[s[0]]),
strconv.Itoa(sCode[s[1]]),
strings.Join(s[2:4], ""),
}
u.SetString(strings.Join(st, ""), 10)
v.SetInt64(97)
w.Mod(u, v)
if w.Uint64() == 1 && lCode[strings.Join(s[0:2], "")] == len(strings.Join(r, "")) {
fmt.Printf("IBAN %s looks good!\n", iban)
} else {
fmt.Printf("IBAN %s looks wrong!\n", iban)
}
}
func (dag *Dagger) Node(L uint64, i uint64) *big.Int {
if L == i {
return dag.hash
}
var m *big.Int
if L == 9 {
m = big.NewInt(16)
} else {
m = big.NewInt(3)
}
sha := sha3.NewKeccak256()
sha.Reset()
d := sha3.NewKeccak256()
b := new(big.Int)
ret := new(big.Int)
for k := 0; k < int(m.Uint64()); k++ {
d.Reset()
d.Write(dag.hash.Bytes())
d.Write(dag.xn.Bytes())
d.Write(big.NewInt(int64(L)).Bytes())
d.Write(big.NewInt(int64(i)).Bytes())
d.Write(big.NewInt(int64(k)).Bytes())
b.SetBytes(Sum(d))
pk := b.Uint64() & ((1 << ((L - 1) * 3)) - 1)
sha.Write(dag.Node(L-1, pk).Bytes())
}
ret.SetBytes(Sum(sha))
return ret
}
func ecrecoverFunc(in []byte) []byte {
// "in" is (hash, v, r, s), each 32 bytes
// but for ecrecover we want (r, s, v)
if len(in) < ecRecoverInputLength {
return nil
}
// Treat V as a 256bit integer
v := new(big.Int).Sub(common.Bytes2Big(in[32:64]), big.NewInt(27))
// Ethereum requires V to be either 0 or 1 => (27 || 28)
if !(v.Cmp(Zero) == 0 || v.Cmp(One) == 0) {
return nil
}
// v needs to be moved to the end
rsv := append(in[64:128], byte(v.Uint64()))
pubKey, err := crypto.Ecrecover(in[:32], rsv)
// make sure the public key is a valid one
if err != nil {
glog.V(logger.Error).Infof("EC RECOVER FAIL: ", err)
return nil
}
// the first byte of pubkey is bitcoin heritage
return common.LeftPadBytes(crypto.Sha3(pubKey[1:])[12:], 32)
}
func TestJWKThumbprint(t *testing.T) {
// Key example from RFC 7638
const base64N = "0vx7agoebGcQSuuPiLJXZptN9nndrQmbXEps2aiAFbWhM78LhWx4cbbfAAt" +
"VT86zwu1RK7aPFFxuhDR1L6tSoc_BJECPebWKRXjBZCiFV4n3oknjhMstn6" +
"4tZ_2W-5JsGY4Hc5n9yBXArwl93lqt7_RN5w6Cf0h4QyQ5v-65YGjQR0_FD" +
"W2QvzqY368QQMicAtaSqzs8KJZgnYb9c7d0zgdAZHzu6qMQvRL5hajrn1n9" +
"1CbOpbISD08qNLyrdkt-bFTWhAI4vMQFh6WeZu0fM4lFd2NcRwr3XPksINH" +
"aQ-G_xBniIqbw0Ls1jF44-csFCur-kEgU8awapJzKnqDKgw"
const base64E = "AQAB"
const expected = "NzbLsXh8uDCcd-6MNwXF4W_7noWXFZAfHkxZsRGC9Xs"
bytes, err := base64.RawURLEncoding.DecodeString(base64N)
if err != nil {
t.Fatalf("Error parsing example key N: %v", err)
}
n := new(big.Int).SetBytes(bytes)
bytes, err = base64.RawURLEncoding.DecodeString(base64E)
if err != nil {
t.Fatalf("Error parsing example key E: %v", err)
}
e := new(big.Int).SetBytes(bytes)
pub := &rsa.PublicKey{N: n, E: int(e.Uint64())}
th := JWKThumbprint(pub)
if th != expected {
t.Errorf("th = %q; want %q", th, expected)
}
}
// Create a new UniformDH instance
func New() *UniformDH {
udh := &UniformDH{}
privStr := make([]byte, groupLen)
// To pick a private UniformDH key, we pick a random 1536-bit number,
// and make it even by setting its low bit to 0. Let x be that private
// key, and X = g^x (mod p).
rand.Read(privStr)
udh.priv.SetBytes(privStr)
/// XXX: is setting this bit *and* modulo 2 necessary?
udh.priv.SetBit(&udh.priv, 0, 0)
// When someone sends her public key to the other party, she randomly
// decides whether to send X or p-X. This makes the public key
// negligibly different from a uniform 1536-bit string
flip := new(big.Int).Mod(&udh.priv, big.NewInt(2))
udh.priv.Sub(&udh.priv, flip)
udh.pub.Exp(big.NewInt(g), &udh.priv, &mod)
if flip.Uint64() == 1 {
udh.pub.Sub(&mod, &udh.pub)
}
/// XXX: handle erroneous situations better
if udh.priv.BitLen() > intSize {
panic("int too large")
}
return udh
}
func (dag *Dagger) Eval(N *big.Int) *big.Int {
pow := common.BigPow(2, 26)
dag.xn = pow.Div(N, pow)
sha := sha3.NewKeccak256()
sha.Reset()
ret := new(big.Int)
for k := 0; k < 4; k++ {
d := sha3.NewKeccak256()
b := new(big.Int)
d.Reset()
d.Write(dag.hash.Bytes())
d.Write(dag.xn.Bytes())
d.Write(N.Bytes())
d.Write(big.NewInt(int64(k)).Bytes())
b.SetBytes(Sum(d))
pk := (b.Uint64() & 0x1ffffff)
sha.Write(dag.Node(9, pk).Bytes())
}
return ret.SetBytes(Sum(sha))
}
// encodeBlock fills the dst buffer with the encoding of src.
// It is assumed the buffers are appropriately sized, and no
// bounds checks are performed. In particular, the dst buffer will
// be zero-padded from right to left in all remaining bytes.
func (enc *Encoding) encodeBlock(dst, src []byte) {
// Interpret the block as a big-endian number (Go's default)
num := new(big.Int).SetBytes(src)
rem := new(big.Int)
quo := new(big.Int)
encodedLen := enc.EncodedLen(len(src))
// Shift over the given number of extra Bits, so that all of our
// wasted bits are on the right.
num = num.Lsh(num, enc.extraBits(len(src), encodedLen))
p := encodedLen - 1
for num.Sign() != 0 {
num, rem = quo.QuoRem(num, enc.baseBig, rem)
dst[p] = enc.encode[rem.Uint64()]
p--
}
// Pad the remainder of the buffer with 0s
for p >= 0 {
dst[p] = enc.encode[0]
p--
}
}
func TestModAdc(t *testing.T) {
A := new(big.Int)
B := new(big.Int)
C := new(big.Int)
Carry := new(big.Int)
Mask := new(big.Int)
for _, a := range numbers {
A.SetUint64(a)
for _, b := range numbers {
B.SetUint64(b)
for width := uint8(1); width < 64; width++ {
carry := b
c := mod_adc(a, width, &carry)
C.Add(A, B)
Carry.Rsh(C, uint(width))
expectedCarry := Carry.Uint64()
Mask.SetUint64(uint64(1)<<width - 1)
C.And(C, Mask)
expected := C.Uint64()
if c != expected || expectedCarry != carry {
t.Fatalf("adc(%d,%d,%d): Expecting %d carry %d but got %d carry %d", a, b, width, expected, expectedCarry, c, carry)
}
}
}
}
}
func ecrecoverFunc(in []byte) []byte {
in = common.RightPadBytes(in, 128)
// "in" is (hash, v, r, s), each 32 bytes
// but for ecrecover we want (r, s, v)
r := common.BytesToBig(in[64:96])
s := common.BytesToBig(in[96:128])
// Treat V as a 256bit integer
vbig := common.Bytes2Big(in[32:64])
v := byte(vbig.Uint64())
if !crypto.ValidateSignatureValues(v, r, s) {
glog.V(logger.Error).Infof("EC RECOVER FAIL: v, r or s value invalid")
return nil
}
// v needs to be at the end and normalized for libsecp256k1
vbignormal := new(big.Int).Sub(vbig, big.NewInt(27))
vnormal := byte(vbignormal.Uint64())
rsv := append(in[64:128], vnormal)
pubKey, err := crypto.Ecrecover(in[:32], rsv)
// make sure the public key is a valid one
if err != nil {
glog.V(logger.Error).Infof("EC RECOVER FAIL: ", err)
return nil
}
// the first byte of pubkey is bitcoin heritage
return common.LeftPadBytes(crypto.Sha3(pubKey[1:])[12:], 32)
}
func getData(data []byte, start, size *big.Int) []byte {
dlen := big.NewInt(int64(len(data)))
s := common.BigMin(start, dlen)
e := common.BigMin(new(big.Int).Add(s, size), dlen)
return common.RightPadBytes(data[s.Uint64():e.Uint64()], int(size.Uint64()))
}
func (d *DatasourceDerive) CalculatePdpPrep(newValue string, interval float64) (float64, error) {
if float64(d.Heartbeat) < interval {
d.LastValue = Undefined
}
rate := math.NaN()
newPdp := math.NaN()
if newValue != Undefined && float64(d.Heartbeat) >= interval {
newInt := new(big.Int)
_, err := fmt.Sscan(newValue, newInt)
if err != nil {
return math.NaN(), errors.Errorf("not a simple signed integer: %s", newValue)
}
if d.LastValue != "U" {
prevInt := new(big.Int)
_, err := fmt.Sscan(d.LastValue, prevInt)
if err != nil {
return math.NaN(), errors.Wrap(err, 0)
}
diff := new(big.Int)
diff.Sub(newInt, prevInt)
newPdp = float64(diff.Uint64())
rate = newPdp / interval
}
}
if !d.checkRateBounds(rate) {
newPdp = math.NaN()
}
d.LastValue = newValue
return newPdp, nil
}
// Encode58 base58 encodes the input.
func Encode58(inp []byte) string {
num := new(big.Int).SetBytes(inp)
buf := make([]byte, 0, len(inp))
base := big.NewInt(int64(58))
rem := new(big.Int)
quo := new(big.Int)
for num.Sign() != 0 {
num, rem = quo.QuoRem(num, base, rem)
c := alphabet[rem.Uint64()]
buf = append(buf, c)
}
// Pad leading zeros...
for _, c := range inp {
if c == 0x0 {
buf = append(buf, alphabet[0])
} else {
// Stop adding padding after the first nonzero byte.
break
}
}
reverseBuf(buf)
return string(buf)
}
// SmallPrimeTest determins if N is a small prime
// or divisible by a small prime.
func SmallPrimeTest(N *big.Int) int {
if N.Sign() <= 0 {
panic("SmallPrimeTest for positive integers only")
}
if N.BitLen() <= 10 {
n := uint16(N.Uint64())
i := sort.Search(len(primes10), func(i int) bool {
return primes10[i] >= n
})
if i >= len(primes10) || n != primes10[i] {
return IsComposite
}
return IsPrime
}
// quick test for N even
if N.Bits()[0]&1 == 0 {
return IsComposite
}
// compare several small gcds for efficency
z := new(big.Int)
if z.GCD(nil, nil, N, prodPrimes10A).Cmp(one) == 1 {
return IsComposite
}
if z.GCD(nil, nil, N, prodPrimes10B).Cmp(one) == 1 {
return IsComposite
}
if z.GCD(nil, nil, N, prodPrimes10C).Cmp(one) == 1 {
return IsComposite
}
if z.GCD(nil, nil, N, prodPrimes10D).Cmp(one) == 1 {
return IsComposite
}
return Undetermined
}
func jump(mapping map[uint64]uint64, destinations map[uint64]struct{}, contract *Contract, to *big.Int) (uint64, error) {
if !validDest(destinations, to) {
nop := contract.GetOp(to.Uint64())
return 0, fmt.Errorf("invalid jump destination (%v) %v", nop, to)
}
return mapping[to.Uint64()], nil
}
/* solution:
Will rapresent the moves as R=right, D=Down....
In any grid of size N, we need N moves of each (R,D) (total 2N moves)
ex for the 2x2 grid we have RRDD,RDRD,RDDR,DRRD,DRDR,DDRR (6 moves)
If we arbitrary choose N of one direction first and fill the rest
with other direction,
the problem becomes a combination problem for N choices out of 2N
so we could use the C(n,k) = n!/(k!(n-k)!) for the answer
where n = 2N and k=N
*/
func Euler015(N int) uint64 {
n, k := (2 * N), N
num := utils.Fact(n)
den := new(big.Int).Mul(utils.Fact(k), utils.Fact(n-k))
res := new(big.Int).Div(num, den)
return res.Uint64()
}
// validDest checks if the given destination is a valid one given the
// destination table of the program
func validDest(dests map[uint64]struct{}, dest *big.Int) bool {
// PC cannot go beyond len(code) and certainly can't be bigger than 64bits.
// Don't bother checking for JUMPDEST in that case.
if dest.Cmp(bigMaxUint64) > 0 {
return false
}
_, ok := dests[dest.Uint64()]
return ok
}
// trailingZeros counts the number of trailing zeros in the
// big.Int value. It first attempts to use an unsigned integer
// representation of the big.Int to compute this because it is
// roughly 8x faster. If this unsigned integer would overflow,
// it falls back to formatting the big.Int itself.
func trailingZeros(bi *big.Int, tmp []byte) int {
if bi.BitLen() <= 64 {
i := bi.Uint64()
bs := strconv.AppendUint(tmp, i, 10)
return trailingZerosFromBytes(bs)
}
bs := bi.Append(tmp, 10)
return trailingZerosFromBytes(bs)
}
func SumBig(n *big.Int, base int) (sum int) {
i := new(big.Int).Set(n)
b := new(big.Int).SetUint64(uint64(base))
r := new(big.Int)
for i.BitLen() > 0 {
i.DivMod(i, b, r)
sum += int(r.Uint64())
}
return
}
func myHashFunc(name string) int {
data := []byte(name)
tmp := md5.Sum(data)
var c []byte
for i := 14; i < 16; i++ {
c = append(c, tmp[i])
}
z := new(big.Int).SetBytes(c)
return int(z.Uint64())
}
func (self *Encoder) optimize(obj *jksn_proxy) *jksn_proxy {
control := obj.Control & 0xf0
if control == 0x10 {
if self.lastint != nil {
origin_int := obj.Origin.(*big.Int)
delta := new(big.Int).Sub(origin_int, self.lastint)
if new(big.Int).Abs(delta).Cmp(new(big.Int).Abs(origin_int)) < 0 {
var new_control uint8
var new_data []byte
if delta.Sign() >= 0 && delta.Cmp(big.NewInt(0x5)) <= 0 {
new_control, new_data = 0xd0|uint8(delta.Uint64()), empty_bytes
} else if delta.Cmp(big.NewInt(-0x5)) >= 0 && delta.Cmp(big.NewInt(-0x1)) <= 0 {
new_control, new_data = 0xd0|uint8(new(big.Int).Add(delta, big.NewInt(11)).Uint64()), empty_bytes
} else if delta.Cmp(big.NewInt(-0x80)) >= 0 && delta.Cmp(big.NewInt(0x7f)) <= 0 {
new_control, new_data = 0xdd, self.encode_int(delta, 1)
} else if delta.Cmp(big.NewInt(-0x8000)) >= 0 && delta.Cmp(big.NewInt(0x7fff)) <= 0 {
new_control, new_data = 0xdc, self.encode_int(delta, 2)
} else if (delta.Cmp(big.NewInt(-0x80000000)) >= 0 && delta.Cmp(big.NewInt(-0x200000)) <= 0) ||
(delta.Cmp(big.NewInt(0x200000)) >= 0 && delta.Cmp(big.NewInt(0x7fffffff)) <= 0) {
new_control, new_data = 0xdb, self.encode_int(delta, 4)
} else if delta.Sign() >= 0 {
new_control, new_data = 0xdf, self.encode_int(delta, 0)
} else {
new_control, new_data = 0xde, self.encode_int(new(big.Int).Neg(delta), 0)
}
if len(new_data) < len(obj.Data) {
obj.Control, obj.Data = new_control, new_data
}
}
}
self.lastint = obj.Origin.(*big.Int)
} else if control == 0x30 || control == 0x40 {
if len(obj.Buf) > 1 {
if bytes.Equal(self.texthash[obj.Hash], obj.Buf) {
obj.Control, obj.Data, obj.Buf = 0x3c, []byte{obj.Hash}, empty_bytes
} else {
self.texthash[obj.Hash] = obj.Buf
}
}
} else if control == 0x50 {
if len(obj.Buf) > 1 {
if bytes.Equal(self.blobhash[obj.Hash], obj.Buf) {
obj.Control, obj.Data, obj.Buf = 0x5c, []byte{obj.Hash}, empty_bytes
} else {
self.blobhash[obj.Hash] = make([]byte, len(obj.Buf))
copy(self.blobhash[obj.Hash], obj.Buf)
}
}
} else {
for _, child := range obj.Children {
self.optimize(child)
}
}
return obj
}
// Encodes n using Knuth's Hashing Algorithm.
// Ensure that you store the prime, modInverse and random number
// associated with the Optimus struct so that it can be decoded
// correctly.
func (o Optimus) Encode(n *big.Int) *big.Int {
b := &big.Int{}
b.SetUint64(((n.Uint64() * o.prime.Uint64()) & o.maxInt.Uint64()) ^ o.random.Uint64())
b.Mul(n, o.prime)
for i := o.bits + 1; i < b.BitLen(); i++ {
b.SetBit(b, i, 0)
}
b.And(b, o.maxInt)
b.Xor(b, o.random)
return b
}
func check(table primesTable, p *big.Int) error {
if q, ok := table[p.Uint64()]; ok {
if p.Cmp(q) == 0 {
log.Printf("same primes TODO \n")
return errors.New("duplicate prime")
}
log.Printf("same uint64, but not same prime TODO \n")
}
table[p.Uint64()] = p
return nil
}
// OTP generates a new one-time password.
func (otp HOTP) OTP() string {
h := hmac.New(sha1.New, otp.Key)
h.Write(otp.counter[:])
otp.Increment()
hash := h.Sum(nil)
result := truncate(hash)
mod := new(big.Int).Exp(big.NewInt(10), big.NewInt(int64(otp.Digits)), nil)
mod = mod.Mod(big.NewInt(result), mod)
fmtStr := fmt.Sprintf("%%0%dd", otp.Digits)
return fmt.Sprintf(fmtStr, mod.Uint64())
}
// IntegrityCheck returns two values, the base OTP and the current
// counter. This is used, for example, with the Google Authenticator
// app's "Check key value" function and can be used to verify that
// the application and the provider are in sync.
func (otp *HOTP) IntegrityCheck() (string, uint64) {
h := hmac.New(sha1.New, otp.Key)
counter := make([]byte, 8)
h.Write(counter)
hash := h.Sum(nil)
result := truncate(hash)
mod := new(big.Int).Exp(big.NewInt(10), big.NewInt(int64(otp.Digits)), nil)
mod = mod.Mod(big.NewInt(result), mod)
fmtStr := fmt.Sprintf("%%0%dd", otp.Digits)
return fmt.Sprintf(fmtStr, mod.Uint64()), otp.Counter()
}
func SumString(n string, base int) (int, error) {
i, ok := new(big.Int).SetString(n, base)
if !ok {
return 0, strconv.ErrSyntax
}
if i.Sign() < 0 {
return 0, strconv.ErrRange
}
if i.BitLen() <= 64 {
return Sum(i.Uint64(), base), nil
}
return SumBig(i, base), nil
}
func TestModSqr(t *testing.T) {
A := new(big.Int)
B := new(big.Int)
for _, a := range numbers {
A.SetUint64(a)
b := mod_sqr(a)
B.Mul(A, A)
B.Mod(B, P)
expected := B.Uint64()
if b != expected {
t.Fatalf("%d**2: Expecting %d but got %d", a, expected, b)
}
}
}
// has checks whether code has a JUMPDEST at dest.
func (d destinations) has(codehash common.Hash, code []byte, dest *big.Int) bool {
// PC cannot go beyond len(code) and certainly can't be bigger than 64bits.
// Don't bother checking for JUMPDEST in that case.
if dest.Cmp(bigMaxUint64) > 0 {
return false
}
m, analysed := d[codehash]
if !analysed {
m = jumpdests(code)
d[codehash] = m
}
_, ok := m[dest.Uint64()]
return ok
}
// IsSquare returns true if N = m^2
// for some positive integer m.
// It uses newtons method and other checks.
func IsSquare(N *big.Int) bool {
// Step -1: check inputs
if N.Sign() <= 0 {
// 0 is a square
if N.Sign() == 0 {
return true
}
// negative numbers are not
return false
}
// Step 0: Easy case
if N.BitLen() < 62 { // need padding, 63 is too close to limit
n := N.Int64()
a := int64(math.Sqrt(float64(n)))
if a*a == n {
return true
}
return false
}
// Step 1.1: check if it is a square mod small power of 2
if _, ok := squaresMod128[uint8(N.Uint64())]; !ok {
return false
}
// Setp 1.2: check if it is a square mod a small number
_z := uint16(new(big.Int).Mod(N, smallSquareMod).Uint64())
if _, ok := smallSquares[_z]; !ok {
return false
}
// Step 2: run newtons method, see
// Cohen's book computational alg. number theory
// Ch. 1, algorithm 1.7.1
z := new(big.Int)
x := new(big.Int).Lsh(one, uint(N.BitLen()+2)>>1)
y := new(big.Int)
for {
// Set y = [(x + [N/x])/2]
y := y.Rsh(z.Add(x, z.Div(N, x)), 1)
// if y < x, set x to y
// else return x
if y.Cmp(x) == -1 {
x.Set(y)
} else {
return z.Mul(x, x).Cmp(N) == 0
}
}
}
func (bc *blockchain) mineGenesisBlock() error {
msg := "Never roll your own crypto"
b := coin.Block(msg)
genesisHeader = coin.Header{
MerkleRoot: sha256.Sum256([]byte(msg)),
Difficulty: MinimumDifficulty,
}
// Calculate modulus
dInt := new(big.Int).SetUint64(genesisHeader.Difficulty)
mInt := new(big.Int).SetUint64(2)
mInt.Exp(mInt, dInt, nil)
ticker := time.NewTicker(90 * time.Second)
getblocktemplate:
genesisHeader.Timestamp = time.Now().UnixNano()
hashMap := make(map[uint64][]uint64)
i := uint64(0)
for {
select {
case <-ticker.C:
goto getblocktemplate
default:
break
}
genesisHeader.Nonces[0] = i
aHash := genesisHeader.SumNonce(0)
aInt := new(big.Int).SetBytes(aHash[:])
aInt.Mod(aInt, mInt)
a := aInt.Uint64()
if ns, ok := hashMap[a]; ok {
if len(ns) == 2 {
genesisHeader.Nonces[0] = ns[0]
genesisHeader.Nonces[1] = ns[1]
genesisHeader.Nonces[2] = i
return bc.AddBlock(genesisHeader, b)
}
hashMap[a] = append(ns, i)
} else {
hashMap[a] = []uint64{i}
}
i++
}
}
// PendingAccountNonce implements ContractTransactor.PendingAccountNonce, delegating
// the current account nonce retrieval to the remote node.
func (b *rpcBackend) PendingAccountNonce(account common.Address) (uint64, error) {
res, err := b.request("exp_getTransactionCount", []interface{}{account.Hex(), "pending"})
if err != nil {
return 0, err
}
var hex string
if err := json.Unmarshal(res, &hex); err != nil {
return 0, err
}
nonce, ok := new(big.Int).SetString(hex, 0)
if !ok {
return 0, fmt.Errorf("invalid nonce hex: %s", hex)
}
return nonce.Uint64(), nil
}
