// Compile instruction
//
// Attempts to compile and parse the given instruction in "s"
// and returns the byte sequence
func CompileInstr(s interface{}) ([]byte, error) {
switch s.(type) {
case string:
str := s.(string)
isOp := IsOpCode(str)
if isOp {
return []byte{OpCodes[str]}, nil
}
// Check for pre formatted byte array
// Jumps are preformatted
if []byte(str)[0] == 0 {
return []byte(str), nil
}
num := new(big.Int)
_, success := num.SetString(str, 0)
// Assume regular bytes during compilation
if !success {
num.SetBytes([]byte(str))
}
return num.Bytes(), nil
case int:
//num := bigToBytes(big.NewInt(int64(s.(int))), 256)
return big.NewInt(int64(s.(int))).Bytes(), nil
case []byte:
return new(big.Int).SetBytes(s.([]byte)).Bytes(), nil
}
return nil, nil
}
// Compile instruction
//
// Attempts to compile and parse the given instruction in "s"
// and returns the byte sequence
func CompileInstr(s interface{}) ([]byte, error) {
switch s := s.(type) {
case vm.OpCode:
return []byte{byte(s)}, nil
case string:
str := s
// Check for pre formatted byte array
// Jumps are preformatted
if []byte(str)[0] == 0 {
return []byte(str), nil
}
num := new(big.Int)
_, success := num.SetString(str, 0)
// Assume regular bytes during compilation
if !success {
num.SetBytes([]byte(str))
}
return num.Bytes(), nil
case int:
return big.NewInt(int64(s)).Bytes(), nil
case []byte:
return new(big.Int).SetBytes(s).Bytes(), nil
}
return nil, nil
}
// (n - 2^(k-1)) mod 2^m
func calcLastFinger(n []byte, k int) (string, []byte) {
// convert the n to a bigint
nBigInt := big.Int{}
nBigInt.SetBytes(n)
// get the right addend, i.e. 2^(k-1)
two := big.NewInt(2)
addend := big.Int{}
addend.Exp(two, big.NewInt(int64(k-1)), nil)
addend.Mul(&addend, big.NewInt(-1))
//Soustraction
neg := big.Int{}
neg.Add(&addend, &nBigInt)
// calculate 2^m
m := 160
ceil := big.Int{}
ceil.Exp(two, big.NewInt(int64(m)), nil)
// apply the mod
result := big.Int{}
result.Mod(&neg, &ceil)
resultBytes := result.Bytes()
resultHex := fmt.Sprintf("%x", resultBytes)
return resultHex, resultBytes
}
// getMPI returns the length encoded Int and the next slice.
func getMPI(b []byte) (*big.Int, []byte) {
p := new(big.Int)
plen := (uint64(b[0])*256 + uint64(b[1]) + 7) >> 3
p.SetBytes(b[2 : plen+2])
b = b[plen+2:]
return p, b
}
// (n + 2^(k-1)) mod (2^m)
func calcFinger(n []byte, k int, m int) (string, []byte) {
// convert the n to a bigint
nBigInt := big.Int{}
nBigInt.SetBytes(n)
// get the right addend, i.e. 2^(k-1)
two := big.NewInt(2)
addend := big.Int{}
addend.Exp(two, big.NewInt(int64(k-1)), nil)
// calculate sum
sum := big.Int{}
sum.Add(&nBigInt, &addend)
// calculate 2^m
ceil := big.Int{}
ceil.Exp(two, big.NewInt(int64(m)), nil)
// apply the mod
result := big.Int{}
result.Mod(&sum, &ceil)
resultBytes := result.Bytes()
resultHex := fmt.Sprintf("%x", resultBytes)
return resultHex, resultBytes
}
func main() {
for _, c := range curves {
f, err := os.Create(c.params.Name)
if err != nil {
fmt.Fprintf(os.Stderr, "error creating file %s: %s", c.params.Name, err)
os.Exit(-1)
}
h := sha3.NewShake256()
h.Write([]byte(c.params.Name))
h.Write([]byte(": doubly prime"))
buf := make([]byte, c.bits)
v := new(big.Int)
fmt.Fprintf(f, "[")
for i := 0; i < 1000; i++ {
if i != 0 {
fmt.Fprintf(f, ",")
}
for trial := 0; ; trial++ {
h.Read(buf)
v.SetBytes(buf)
if v.Cmp(c.params.P) == -1 {
break
}
}
fmt.Fprintf(f, "%d", v)
}
fmt.Fprintf(f, "]\n")
f.Close()
}
}
func TestPad(t *testing.T) {
private, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil || private == nil {
t.Fatal("Can't gen private key %s\n", err)
}
public := &private.PublicKey
var a [9]byte
copy(a[0:8], "IDENTITY")
seed := []byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16}
encrypted_secret, err := rsa.EncryptOAEP(sha1.New(), rand.Reader,
public, seed, a[0:9])
if err != nil {
t.Fatal("Can't encrypt ", err)
}
fmt.Printf("encrypted_secret: %x\n", encrypted_secret)
decrypted_secret, err := rsa.DecryptOAEP(sha1.New(), rand.Reader,
private, encrypted_secret, a[0:9])
if err != nil {
t.Fatal("Can't decrypt ", err)
}
fmt.Printf("decrypted_secret: %x\n", decrypted_secret)
var N *big.Int
var D *big.Int
var x *big.Int
var z *big.Int
N = public.N
D = private.D
x = new(big.Int)
z = new(big.Int)
x.SetBytes(encrypted_secret)
z = z.Exp(x, D, N)
decrypted_pad := z.Bytes()
fmt.Printf("decrypted_pad : %x\n", decrypted_pad)
}
// Sign signs a blinded message
func (signer *Signer) Sign(blindmessage *BlindMessageInt, privateParams *SignRequestPrivateInt) (signature *BlindSignatureInt, err error) {
if privateParams.IsUsed {
return nil, eccutil.ErrParamReuse
}
//cparams := signer.curve.curve.Params()
privkeyInt := new(big.Int)
privkeyInt = privkeyInt.SetBytes(signer.privkey)
_, err = signer.curve.TestParams(privkeyInt, blindmessage.M1, blindmessage.M2, privateParams.ScalarRs1, privateParams.ScalarKs1, privateParams.ScalarLs1, privateParams.ScalarRs2, privateParams.ScalarKs2, privateParams.ScalarLs2)
if err != nil {
return nil, err // Should never fire
}
mt1 := eccutil.ManyMult(privkeyInt, blindmessage.M1) // SigPriv * m1
mt2 := eccutil.ManyMult(privkeyInt, blindmessage.M2) // SigPriv * m2
ms1 := eccutil.ManyMult(privateParams.ScalarRs1, privateParams.ScalarKs1, privateParams.ScalarLs1) // rs1 * k1 * l1
ms2 := eccutil.ManyMult(privateParams.ScalarRs2, privateParams.ScalarKs2, privateParams.ScalarLs2) // rs2 * k2 * l2
ss1, ss2 := new(big.Int), new(big.Int)
ss1 = ss1.Sub(mt1, ms1) // (SigPriv * m1) - (rs1 * k1 * l1)
ss2 = ss2.Sub(mt2, ms2) // (SigPriv * m2) - (rs2 * k2 * l2)
ss1 = ss1.Mod(ss1, signer.curve.Params.N) // ss1 = (SigPriv * m1 - rs1 * k1 * l1) mod N
ss2 = ss2.Mod(ss2, signer.curve.Params.N) // ss2 = (SigPriv * m2 - rs2 * k2 * l2) mod N
signaturet := new(BlindSignatureInt)
signaturet.ScalarS1 = ss1
signaturet.ScalarS2 = ss2
return signaturet, nil
}
func (p *PrivateKeys) addRemoteKey(remote []byte, clientPacket []byte, serverPacket []byte) SharedKeys {
remote_be := new(big.Int)
remote_be.SetBytes(remote)
shared_key := powm(remote_be, p.privateKey, p.prime)
data := make([]byte, 0, 100)
mac := hmac.New(sha1.New, shared_key.Bytes())
for i := 1; i < 6; i++ {
mac.Write(clientPacket)
mac.Write(serverPacket)
mac.Write([]byte{uint8(i)})
data = append(data, mac.Sum(nil)...)
mac.Reset()
}
mac = hmac.New(sha1.New, data[0:0x14])
mac.Write(clientPacket)
mac.Write(serverPacket)
return SharedKeys{
challenge: mac.Sum(nil),
sendKey: data[0x14:0x34],
recvKey: data[0x34:0x54],
}
}
// Put implements storage.Contacts.
func (c *contacts) Put(name string, key *sf.PublicKey) error {
if len(name) == 0 {
return errgo.New("empty key name")
}
return c.db.Update(func(tx *bolt.Tx) error {
contactsBucket, err := tx.CreateBucketIfNotExists([]byte("contacts"))
if err != nil {
return errgo.Mask(err)
}
err = contactsBucket.Put(key[:], []byte(name))
if err != nil {
return errgo.Mask(err)
}
keysBucket, err := contactsBucket.CreateBucketIfNotExists([]byte(name))
if err != nil {
return errgo.Mask(err)
}
lastSeqBytes, _ := keysBucket.Cursor().Last()
var seq big.Int
seq.SetBytes(lastSeqBytes)
seq.Add(&seq, bigOne)
err = keysBucket.Put(seq.Bytes(), key[:])
if err != nil {
return errgo.Mask(err)
}
return nil
})
}
// Returns a big integer with the given nb bytes
func RandomBigInt(nb int) *big.Int {
b := make([]byte, nb)
rand.Read(b)
r := new(big.Int)
r.SetBytes(b)
return r
}
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 (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))
}
// powerOffset computes the offset by (n + 2^exp) % (2^mod)
func powerOffset(id []byte, exp int, mod int) []byte {
// Copy the existing slice
off := make([]byte, len(id))
copy(off, id)
// Convert the ID to a bigint
idInt := big.Int{}
idInt.SetBytes(id)
// Get the offset
two := big.NewInt(2)
offset := big.Int{}
offset.Exp(two, big.NewInt(int64(exp)), nil)
// Sum
sum := big.Int{}
sum.Add(&idInt, &offset)
// Get the ceiling
ceil := big.Int{}
ceil.Exp(two, big.NewInt(int64(mod)), nil)
// Apply the mod
idInt.Mod(&sum, &ceil)
// Add together
return idInt.Bytes()
}
/*
KeyedPRF is a psuedo random function. It hashes the input, pads it to
the correct output length, and then encrypts it with AES. Finally it
checks that the result is within the desired range. If it is it returns
the value as a long integer, if it isn't, it increments a nonce in the
input and recalculates until it finds an integer in the given range
*/
func keyedPRFBig(key []byte, r *big.Int, x int) (*big.Int, error) {
aesBlockEncrypter, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
aesEncrypter := cipher.NewCFBEncrypter(aesBlockEncrypter, make([]byte, aes.BlockSize))
hash := sha256.New()
var num big.Int
result := make([]byte, r.BitLen()>>3)
for nonce := 0; ; nonce++ {
hash.Reset()
hash.Write([]byte(strconv.Itoa(x + nonce)))
h := hash.Sum(nil)
if r.BitLen() > 32*8 {
len := 32 - uint((r.BitLen()+7)>>3)
h = append(h, make([]byte, len)...)
}
if r.BitLen() < 32*8 {
len := uint((r.BitLen() + 7) >> 3)
h = h[:len]
}
aesEncrypter.XORKeyStream(result, h)
num.SetBytes(result)
if num.Cmp(r) < 0 {
break
}
}
return &num, nil
}
func CompileInstr(s interface{}) ([]byte, error) {
switch s.(type) {
case string:
str := s.(string)
isOp := IsOpCode(str)
if isOp {
return []byte{OpCodes[str]}, nil
}
num := new(big.Int)
_, success := num.SetString(str, 0)
// Assume regular bytes during compilation
if !success {
num.SetBytes([]byte(str))
}
return num.Bytes(), nil
case int:
return big.NewInt(int64(s.(int))).Bytes(), nil
case []byte:
return BigD(s.([]byte)).Bytes(), nil
}
return nil, nil
}
func (d *decoder) decodeUint128(size uint, offset uint) (*big.Int, uint, error) {
newOffset := offset + size
val := new(big.Int)
val.SetBytes(d.buffer[offset:newOffset])
return val, newOffset, nil
}
func generateKeys() privateKeys {
private := new(big.Int)
private.SetBytes(randomVec(95))
nonce := randomVec(0x10)
return generateKeysFromPrivate(private, nonce)
}
// Base58Encode encodes a byte slice to a modified base58 string.
func Base58Encode(b []byte, alphabet string) string {
x := new(big.Int)
x.SetBytes(b)
answer := make([]byte, 0)
for x.Cmp(bigZero) > 0 {
mod := new(big.Int)
x.DivMod(x, bigRadix, mod)
answer = append(answer, alphabet[mod.Int64()])
}
// leading zero bytes
for _, i := range b {
if i != 0 {
break
}
answer = append(answer, alphabet[0])
}
// reverse
alen := len(answer)
for i := 0; i < alen/2; i++ {
answer[i], answer[alen-1-i] = answer[alen-1-i], answer[i]
}
return string(answer)
}
func CreateID(d *schema.ResourceData, meta interface{}) error {
byteLength := d.Get("byte_length").(int)
bytes := make([]byte, byteLength)
n, err := rand.Reader.Read(bytes)
if n != byteLength {
return fmt.Errorf("generated insufficient random bytes")
}
if err != nil {
return fmt.Errorf("error generating random bytes: %s", err)
}
b64Str := base64.RawURLEncoding.EncodeToString(bytes)
hexStr := hex.EncodeToString(bytes)
int := big.Int{}
int.SetBytes(bytes)
decStr := int.String()
d.SetId(b64Str)
d.Set("b64", b64Str)
d.Set("hex", hexStr)
d.Set("dec", decStr)
return nil
}
func wipeBigInt(k *big.Int) {
if k == nil {
return
}
k.SetBytes(zeroes(len(k.Bytes())))
}
func (c *Conversation) processSMP4(mpis []*big.Int) error {
if len(mpis) != 3 {
return errors.New("otr: incorrect number of arguments in SMP4 message")
}
rb := mpis[0]
cr := mpis[1]
d7 := mpis[2]
h := sha256.New()
r := new(big.Int).Exp(c.smp.qaqb, d7, p)
s := new(big.Int).Exp(rb, cr, p)
r.Mul(r, s)
r.Mod(r, p)
s.Exp(g, d7, p)
t := new(big.Int).Exp(c.smp.g3b, cr, p)
s.Mul(s, t)
s.Mod(s, p)
t.SetBytes(hashMPIs(h, 8, s, r))
if t.Cmp(cr) != 0 {
return errors.New("otr: ZKP cR failed in SMP4 message")
}
r.Exp(rb, c.smp.a3, p)
if r.Cmp(c.smp.papb) != 0 {
return smpFailureError
}
return nil
}
func (c *Conversation) processSMP1(mpis []*big.Int) error {
if len(mpis) != 6 {
return errors.New("otr: incorrect number of arguments in SMP1 message")
}
g2a := mpis[0]
c2 := mpis[1]
d2 := mpis[2]
g3a := mpis[3]
c3 := mpis[4]
d3 := mpis[5]
h := sha256.New()
r := new(big.Int).Exp(g, d2, p)
s := new(big.Int).Exp(g2a, c2, p)
r.Mul(r, s)
r.Mod(r, p)
t := new(big.Int).SetBytes(hashMPIs(h, 1, r))
if c2.Cmp(t) != 0 {
return errors.New("otr: ZKP c2 incorrect in SMP1 message")
}
r.Exp(g, d3, p)
s.Exp(g3a, c3, p)
r.Mul(r, s)
r.Mod(r, p)
t.SetBytes(hashMPIs(h, 2, r))
if c3.Cmp(t) != 0 {
return errors.New("otr: ZKP c3 incorrect in SMP1 message")
}
c.smp.g2a = g2a
c.smp.g3a = g3a
return nil
}
// splitK returns a balanced length-two representation of k and their signs.
// This is algorithm 3.74 from [GECC].
//
// One thing of note about this algorithm is that no matter what c1 and c2 are,
// the final equation of k = k1 + k2 * lambda (mod n) will hold. This is
// provable mathematically due to how a1/b1/a2/b2 are computed.
//
// c1 and c2 are chosen to minimize the max(k1,k2).
func (curve *KoblitzCurve) splitK(k []byte) ([]byte, []byte, int, int) {
// All math here is done with big.Int, which is slow.
// At some point, it might be useful to write something similar to
// FieldVal but for N instead of P as the prime field if this ends up
// being a bottleneck.
bigIntK := new(big.Int)
c1, c2 := new(big.Int), new(big.Int)
tmp1, tmp2 := new(big.Int), new(big.Int)
k1, k2 := new(big.Int), new(big.Int)
bigIntK.SetBytes(k)
// c1 = round(b2 * k / n) from step 4.
// Rounding isn't really necessary and costs too much, hence skipped
c1.Mul(curve.b2, bigIntK)
c1.Div(c1, curve.N)
// c2 = round(b1 * k / n) from step 4 (sign reversed to optimize one step)
// Rounding isn't really necessary and costs too much, hence skipped
c2.Mul(curve.b1, bigIntK)
c2.Div(c2, curve.N)
// k1 = k - c1 * a1 - c2 * a2 from step 5 (note c2's sign is reversed)
tmp1.Mul(c1, curve.a1)
tmp2.Mul(c2, curve.a2)
k1.Sub(bigIntK, tmp1)
k1.Add(k1, tmp2)
// k2 = - c1 * b1 - c2 * b2 from step 5 (note c2's sign is reversed)
tmp1.Mul(c1, curve.b1)
tmp2.Mul(c2, curve.b2)
k2.Sub(tmp2, tmp1)
// Note Bytes() throws out the sign of k1 and k2. This matters
// since k1 and/or k2 can be negative. Hence, we pass that
// back separately.
return k1.Bytes(), k2.Bytes(), k1.Sign(), k2.Sign()
}
func setBytesReverse(b *big.Int, d []byte) *big.Int {
buf := make([]byte, len(d))
for i := 0; i < len(d); i++ {
buf[len(d)-i-1] = d[i]
}
return b.SetBytes(buf)
}
func (h *hasher) GetLoggregatorServerForAppId(appId string) string {
var id, numberOfItems big.Int
id.SetBytes([]byte(appId))
numberOfItems.SetInt64(int64(len(h.items)))
id.Mod(&id, &numberOfItems)
return h.items[id.Int64()]
}
func (key Keypair) Decrypt(ciphertext []byte) []byte {
dataInt := new(big.Int)
dataInt.SetBytes(ciphertext)
msg := new(big.Int).Exp(dataInt, key.D, key.N)
return msg.Bytes()
}
//example hash function
func H(to_hash, salt []byte) big.Int {
var x big.Int
dk := pbkdf2.Key(to_hash, salt, 10000, 128, sha512.New)
x.SetBytes(dk)
return x
}
func (key Keypair) Encrypt(plaintext []byte) []byte {
dataInt := new(big.Int)
dataInt.SetBytes(plaintext)
msg := new(big.Int).Exp(dataInt, big.NewInt(int64(key.E)), key.N)
return msg.Bytes()
}
func (txn *NameAllocation) Verify(publicKey *ecdsa.PublicKey) bool {
buf := bytes.NewBuffer([]byte{})
binary.Write(buf, binary.LittleEndian, sha1.Sum(append([]byte("ALLOCATE"), txn.Name...)))
r := new(big.Int)
s := new(big.Int)
r.SetBytes(txn.SignatureR)
s.SetBytes(txn.SignatureS)
return ecdsa.Verify(publicKey, buf.Bytes(), r, s)
}