Ejemplo n.º 1
2
func GetHash(a string) (hash.Hash, error) {
	var h hash.Hash
	switch a {
	case "adler32":
		h = adler32.New()
	case "crc32", "crc32ieee":
		h = crc32.New(crc32.MakeTable(crc32.IEEE))
	case "crc32castagnoli":
		h = crc32.New(crc32.MakeTable(crc32.Castagnoli))
	case "crc32koopman":
		h = crc32.New(crc32.MakeTable(crc32.Koopman))
	case "crc64", "crc64iso":
		h = crc64.New(crc64.MakeTable(crc64.ISO))
	case "crc64ecma":
		h = crc64.New(crc64.MakeTable(crc64.ECMA))
	case "fnv", "fnv32":
		h = fnv.New32()
	case "fnv32a":
		h = fnv.New32a()
	case "fnv64":
		h = fnv.New64()
	case "fnv64a":
		h = fnv.New64a()
	case "hmac", "hmacsha256":
		h = hmac.New(sha256.New, []byte(key))
	case "hmacmd5":
		h = hmac.New(md5.New, []byte(key))
	case "hmacsha1":
		h = hmac.New(sha1.New, []byte(key))
	case "hmacsha512":
		h = hmac.New(sha512.New, []byte(key))
	case "md4":
		h = md4.New()
	case "md5":
		h = md5.New()
	case "ripemd160":
		h = ripemd160.New()
	case "sha1":
		h = sha1.New()
	case "sha224":
		h = sha256.New224()
	case "sha256":
		h = sha256.New()
	case "sha384":
		h = sha512.New384()
	case "sha512":
		h = sha512.New()
	default:
		return nil, errors.New("Invalid algorithm")
	}
	return h, nil
}
Ejemplo n.º 2
0
func RimpHash(in []byte, out []byte) {
	sha := sha256.New()
	sha.Write(in)
	rim := ripemd160.New()
	rim.Write(sha.Sum(nil)[:])
	copy(out, rim.Sum(nil))
}
Ejemplo n.º 3
0
func hash160(data []byte) []byte {
	sha := sha256.New()
	ripe := ripemd160.New()
	sha.Write(data)
	ripe.Write(sha.Sum(nil))
	return ripe.Sum(nil)
}
Ejemplo n.º 4
0
func Sha256RipeMD160(b []byte) []byte {
	ripe := ripemd160.New()
	sha := sha256.New()
	sha.Write(b)
	ripe.Write(sha.Sum(nil))
	return ripe.Sum(nil)
}
Ejemplo n.º 5
0
// Convert ECC-256 Public Key to an EMP address (raw 25 bytes).
func GetAddress(log chan string, x, y *big.Int) []byte {
	pubKey := elliptic.Marshal(elliptic.P256(), x, y)
	ripemd := ripemd160.New()

	sum := sha512.Sum384(pubKey)
	sumslice := make([]byte, sha512.Size384, sha512.Size384)
	for i := 0; i < sha512.Size384; i++ {
		sumslice[i] = sum[i]
	}

	ripemd.Write(sumslice)
	appender := ripemd.Sum(nil)
	appender = appender[len(appender)-20:]
	address := make([]byte, 1, 1)

	// Version 0x01
	address[0] = 0x01
	address = append(address, appender...)

	sum = sha512.Sum384(address)
	sum = sha512.Sum384(sum[:])

	for i := 0; i < 4; i++ {
		address = append(address, sum[i])
	}

	return address
}
Ejemplo n.º 6
0
// General Convenience
func SimpleHashFromBinary(item interface{}) []byte {
	hasher, n, err := ripemd160.New(), new(int64), new(error)
	wire.WriteBinary(item, hasher, n, err)
	if *err != nil {
		PanicCrisis(err)
	}
	return hasher.Sum(nil)
}
Ejemplo n.º 7
0
Archivo: msg.go Proyecto: nictuku/bitz
// Bitmessage produces a hash for the provided message using a SHA-512 in the
// first round and a RIPEMD-160 in the second.
func Bitmessage(msg []byte) ([]byte, error) {
	s := sha512.New()
	s.Write(msg)

	r := ripemd160.New()
	r.Write(s.Sum(nil))
	return r.Sum(nil), nil
}
Ejemplo n.º 8
0
func BinaryRipemd160(o interface{}) []byte {
	hasher, n, err := ripemd160.New(), new(int64), new(error)
	WriteBinary(o, hasher, n, err)
	if *err != nil {
		panic(*err)
	}
	return hasher.Sum(nil)
}
Ejemplo n.º 9
0
// Returns hash: RIMP160( SHA256( data ) )
func Rimp160AfterSha256(in []byte) (res [20]byte) {
	sha := sha256.New()
	sha.Write(in)
	rim := ripemd160.New()
	rim.Write(sha.Sum(nil)[:])
	copy(res[:], rim.Sum(nil))
	return
}
Ejemplo n.º 10
0
func execRipemd160(ctx *execContext, op Opcode, _ []byte) error {
	if ctx.stack.empty() {
		return errStackItemMissing
	}
	r := ripemd160.New()
	r.Write(ctx.stack.pop())
	ctx.stack.push(r.Sum(nil))
	return nil
}
Ejemplo n.º 11
0
func (part *Part) Hash() []byte {
	if part.hash != nil {
		return part.hash
	} else {
		hasher := ripemd160.New()
		hasher.Write(part.Bytes) // doesn't err
		part.hash = hasher.Sum(nil)
		return part.hash
	}
}
Ejemplo n.º 12
0
func execHash160(ctx *execContext, op Opcode, _ []byte) error {
	if ctx.stack.empty() {
		return errStackItemMissing
	}
	h := sha256.Sum256(ctx.stack.pop())
	r := ripemd160.New()
	r.Write(h[:])
	ctx.stack.push(r.Sum(nil))
	return nil
}
Ejemplo n.º 13
0
func SimpleHashFromTwoHashes(left []byte, right []byte) []byte {
	var n int64
	var err error
	var hasher = ripemd160.New()
	wire.WriteByteSlice(left, hasher, &n, &err)
	wire.WriteByteSlice(right, hasher, &n, &err)
	if err != nil {
		PanicCrisis(err)
	}
	return hasher.Sum(nil)
}
Ejemplo n.º 14
0
func Sha256RipeMD160(b []byte) ([]byte, error) {
	ripe := ripemd160.New()
	sha := sha256.New()
	if _, err := sha.Write(b); err != nil {
		return nil, err
	}
	if _, err := ripe.Write(sha.Sum(nil)); err != nil {
		return nil, err
	}
	return ripe.Sum(nil), nil
}
Ejemplo n.º 15
0
func (kv KVPair) Hash() []byte {
	hasher, n, err := ripemd160.New(), new(int64), new(error)
	wire.WriteString(kv.Key, hasher, n, err)
	if kvH, ok := kv.Value.(Hashable); ok {
		wire.WriteByteSlice(kvH.Hash(), hasher, n, err)
	} else {
		wire.WriteBinary(kv.Value, hasher, n, err)
	}
	if *err != nil {
		PanicSanity(*err)
	}
	return hasher.Sum(nil)
}
Ejemplo n.º 16
0
func ECDSAPublicKeyToString(key ecdsa.PublicKey) string {
	x := key.X.Bytes()
	y := key.Y.Bytes()
	sha := util.SHA256(append(append([]byte{0x04}, x...), y...)) // should it be 0x04?
	ripe := ripemd160.New().Sum(sha)
	ripesha := util.SHA256(ripe)
	ripedoublesha := util.SHA256(ripesha)
	head := ripedoublesha[0:3]
	final := append(ripe, head...)
	i := new(big.Int)
	i.SetBytes(final)
	var b []byte
	return string(base58.EncodeBig(b, i))
}
Ejemplo n.º 17
0
// Hash160 performs the same operations as OP_HASH160 in Bitcoin Script
// It hashes the given data first with SHA256, then RIPEMD160
func Hash160(data []byte) ([]byte, error) {
	//Does identical function to Script OP_HASH160. Hash once with SHA-256, then RIPEMD-160
	if data == nil {
		return nil, errors.New("Empty bytes cannot be hashed")
	}
	shaHash := sha256.New()
	shaHash.Write(data)
	hash := shaHash.Sum(nil) //SHA256 first
	ripemd160Hash := ripemd160.New()
	ripemd160Hash.Write(hash)
	hash = ripemd160Hash.Sum(nil) //RIPEMD160 second

	return hash, nil
}
Ejemplo n.º 18
0
func ripemd160Func(input []byte, gas *uint64) (output []byte, err error) {
	// Deduct gas
	gasRequired := uint64((len(input)+31)/32)*GasRipemd160Word + GasRipemd160Base
	if *gas < gasRequired {
		return nil, ErrInsufficientGas
	} else {
		*gas -= gasRequired
	}
	// Hash
	hasher := ripemd160.New()
	_, err = hasher.Write(input)
	if err != nil {
		panic(err)
	}
	return LeftPadBytes(hasher.Sum(nil), 32), nil
}
Ejemplo n.º 19
0
// NOTE: sets hashes recursively
func (node *IAVLNode) hashWithCount(t *IAVLTree) ([]byte, int) {
	if node.hash != nil {
		return node.hash, 0
	}

	hasher := ripemd160.New()
	buf := new(bytes.Buffer)
	_, hashCount, err := node.writeHashBytes(t, buf)
	if err != nil {
		PanicCrisis(err)
	}
	// fmt.Printf("Wrote IAVL hash bytes: %X\n", buf.Bytes())
	hasher.Write(buf.Bytes())
	node.hash = hasher.Sum(nil)
	// fmt.Printf("Write IAVL hash: %X\n", node.hash)

	return node.hash, hashCount + 1
}
Ejemplo n.º 20
0
// ToAddressUncompressed converts a Bitcoin public key to an uncompressed Bitcoin address string.
func (pub *PublicKey) ToAddressUncompressed() (address string) {
	/* See https://en.bitcoin.it/wiki/Technical_background_of_Bitcoin_addresses */

	/* Convert the public key to bytes */
	pub_bytes := pub.ToBytesUncompressed()

	/* SHA256 Hash */
	sha256_h := sha256.New()
	sha256_h.Reset()
	sha256_h.Write(pub_bytes)
	pub_hash_1 := sha256_h.Sum(nil)

	/* RIPEMD-160 Hash */
	ripemd160_h := ripemd160.New()
	ripemd160_h.Reset()
	ripemd160_h.Write(pub_hash_1)
	pub_hash_2 := ripemd160_h.Sum(nil)

	/* Convert hash bytes to base58 check encoded sequence */
	address = b58checkencode(0x00, pub_hash_2)

	return address
}
Ejemplo n.º 21
0
func GetHash(alg string) (hash.Hash, error) {
	var h hash.Hash
	switch alg {
	default:
		return nil, fmt.Errorf("Invalid algorithm")
	case "md4":
		h = md4.New()
	case "md5":
		h = md5.New()
	case "ripemd160":
		h = ripemd160.New()
	case "sha1":
		h = sha1.New()
	case "sha224":
		h = sha256.New224()
	case "sha256":
		h = sha256.New()
	case "sha384":
		h = sha512.New384()
	case "sha512":
		h = sha512.New()
	}
	return h, nil
}
Ejemplo n.º 22
0
func evalScript(p []byte, stack *scrStack, tx *Tx, inp int) bool {
	var vfExec scrStack
	var altstack scrStack
	sta, idx, nOpCount := 0, 0, 0
	for idx < len(p) {
		fExec := vfExec.empties() == 0

		// Read instruction
		opcode, vchPushValue, n, e := getOpcode(p[idx:])
		if e != nil {
			println(e.Error())
			return false
		}
		idx += n

		if don(DBG_SCRIPT) {
			fmt.Printf("\nExecuting opcode 0x%02x..\n", opcode)
			stack.print()
		}

		if vchPushValue != nil && len(vchPushValue) > MAX_SCRIPT_ELEMENT_SIZE {
			println("vchPushValue too long", len(vchPushValue))
			return false
		}

		if opcode > 0x60 {
			nOpCount++
			if nOpCount > 201 {
				println("evalScript: too many opcodes A")
				return false
			}
		}

		if opcode == 0x7e /*OP_CAT*/ ||
			opcode == 0x7f /*OP_SUBSTR*/ ||
			opcode == 0x80 /*OP_LEFT*/ ||
			opcode == 0x81 /*OP_RIGHT*/ ||
			opcode == 0x83 /*OP_INVERT*/ ||
			opcode == 0x84 /*OP_AND*/ ||
			opcode == 0x85 /*OP_OR*/ ||
			opcode == 0x86 /*OP_XOR*/ ||
			opcode == 0x8d /*OP_2MUL*/ ||
			opcode == 0x8e /*OP_2DIV*/ ||
			opcode == 0x95 /*OP_MUL*/ ||
			opcode == 0x96 /*OP_DIV*/ ||
			opcode == 0x97 /*OP_MOD*/ ||
			opcode == 0x98 /*OP_LSHIFT*/ ||
			opcode == 0x99 /*OP_RSHIFT*/ {
			println("Unsupported opcode")
			return false
		}

		if fExec && 0 <= opcode && opcode <= 0x4e /*OP_PUSHDATA4*/ {
			stack.push(vchPushValue[:])
		} else if fExec || (0x63 /*OP_IF*/ <= opcode && opcode <= 0x68 /*OP_ENDIF*/) {
			switch {
			case opcode == 0x4f: // OP_1NEGATE
				stack.pushInt(-1)

			case opcode >= 0x51 && opcode <= 0x60: // OP_1-OP_16
				stack.pushInt(opcode - 0x50)

			case opcode == 0x61: // OP_NOP
				// Do nothing

			case opcode == 0x62: // OP_VER
				// I think, do nothing...

			case opcode == 0x63 || opcode == 0x64: //OP_IF || OP_NOTIF
				// <expression> if [statements] [else [statements]] endif
				fValue := false
				if fExec {
					if stack.size() < 1 {
						println("Stack too short for", opcode)
						return false
					}
					if opcode == 0x63 /*OP_IF*/ {
						fValue = stack.popInt() != 0
					} else {
						fValue = stack.popInt() == 0
					}
				}
				vfExec.pushBool(fValue)

			case opcode == 0x67: //OP_ELSE
				if vfExec.size() == 0 {
					println("vfExec empty in OP_ELSE")
				}
				vfExec.pushBool(vfExec.popInt() == 0)

			case opcode == 0x68: //OP_ENDIF
				if vfExec.size() == 0 {
					println("vfExec empty in OP_ENDIF")
				}
				vfExec.pop()

			case opcode == 0x69: //OP_VERIFY
				if stack.size() < 1 {
					println("Stack too short for opcode", opcode)
					return false
				}
				if stack.topInt(-1) == 0 {
					return false
				}
				stack.pop()

			case opcode == 0x6b: //OP_TOALTSTACK
				if stack.size() < 1 {
					println("Stack too short for opcode", opcode)
					return false
				}
				altstack.push(stack.pop())

			case opcode == 0x6c: //OP_FROMALTSTACK
				if altstack.size() < 1 {
					println("AltStack too short for opcode", opcode)
					return false
				}
				stack.push(altstack.pop())

			case opcode == 0x6d: //OP_2DROP
				if stack.size() < 2 {
					println("Stack too short for opcode", opcode)
					return false
				}
				stack.pop()
				stack.pop()

			case opcode == 0x6e: //OP_2DUP
				if stack.size() < 2 {
					println("Stack too short for opcode", opcode)
					return false
				}
				x1 := stack.top(-1)
				x2 := stack.top(-2)
				stack.push(x2)
				stack.push(x1)

			case opcode == 0x6f: //OP_3DUP
				if stack.size() < 3 {
					println("Stack too short for opcode", opcode)
					return false
				}
				x1 := stack.top(-3)
				x2 := stack.top(-2)
				x3 := stack.top(-1)
				stack.push(x1)
				stack.push(x2)
				stack.push(x3)

			case opcode == 0x70: //OP_2OVER
				if stack.size() < 4 {
					println("Stack too short for opcode", opcode)
					return false
				}
				x1 := stack.top(-4)
				x2 := stack.top(-3)
				stack.push(x1)
				stack.push(x2)

			case opcode == 0x73: //OP_IFDUP
				if stack.size() < 1 {
					println("Stack too short for opcode", opcode)
					return false
				}
				ti := stack.topInt(-1)
				if ti != 0 {
					stack.pushInt(ti)
				}

			case opcode == 0x74: //OP_DEPTH
				stack.pushInt(stack.size())

			case opcode == 0x75: //OP_DROP
				if stack.size() < 1 {
					println("Stack too short for opcode", opcode)
					return false
				}
				stack.pop()

			case opcode == 0x76: //OP_DUP
				if stack.size() < 1 {
					println("Stack too short for opcode", opcode)
					return false
				}
				el := stack.pop()
				stack.push(el)
				stack.push(el)

			case opcode == 0x77: //OP_NIP
				if stack.size() < 2 {
					println("Stack too short for opcode", opcode)
					return false
				}
				x := stack.pop()
				stack.pop()
				stack.push(x)

			case opcode == 0x78: //OP_OVER
				if stack.size() < 2 {
					println("Stack too short for opcode", opcode)
					return false
				}
				stack.push(stack.top(-2))

			case opcode == 0x79 || opcode == 0x7a: //OP_PICK || OP_ROLL
				if stack.size() < 2 {
					println("Stack too short for opcode", opcode)
					return false
				}
				n := stack.popInt()
				if n < 0 || n >= stack.size() {
					println("Wrong n for opcode", opcode)
					return false
				}
				if opcode == 0x79 /*OP_PICK*/ {
					stack.push(stack.top(-1 - n))
				} else if n > 0 {
					tmp := make([][]byte, n)
					for i := range tmp {
						tmp[i] = stack.pop()
					}
					xn := stack.pop()
					for i := len(tmp) - 1; i >= 0; i-- {
						stack.push(tmp[i])
					}
					stack.push(xn)
				}

			case opcode == 0x7b: //OP_ROT
				if stack.size() < 3 {
					println("Stack too short for opcode", opcode)
					return false
				}
				x1 := stack.pop()
				x2 := stack.pop()
				x3 := stack.pop()
				stack.push(x2)
				stack.push(x3)
				stack.push(x1)

			case opcode == 0x7c: //OP_SWAP
				if stack.size() < 2 {
					println("Stack too short for opcode", opcode)
					return false
				}
				x1 := stack.pop()
				x2 := stack.pop()
				stack.push(x1)
				stack.push(x2)

			case opcode == 0x7d: //OP_TUCK
				if stack.size() < 2 {
					println("Stack too short for opcode", opcode)
					return false
				}
				x1 := stack.pop()
				x2 := stack.pop()
				stack.push(x2)
				stack.push(x1)
				stack.push(x2)

			case opcode == 0x82: //OP_SIZE
				if stack.size() < 1 {
					println("Stack too short for opcode", opcode)
					return false
				}
				stack.pushInt(len(stack.top(-1)))

			case opcode == 0x87: //OP_EQUAL
				if stack.size() < 2 {
					println("Stack too short for opcode", opcode)
					return false
				}
				if bytes.Equal(stack.pop()[:], stack.pop()[:]) {
					stack.push([]byte{1})
				} else {
					stack.push([]byte{0})
				}

			case opcode == 0x88: //OP_EQUALVERIFY
				if stack.size() < 2 {
					println("Stack too short for opcode", opcode)
					return false
				}
				return bytes.Equal(stack.pop()[:], stack.pop()[:])

			case opcode == 0x8c: //OP_1SUB
				if stack.size() < 1 {
					println("Stack too short for opcode", opcode)
					return false
				}
				stack.pushInt(stack.popInt() - 1)

			case opcode == 0x8f: //OP_NEGATE
				if stack.size() < 1 {
					println("Stack too short for opcode", opcode)
					return false
				}
				stack.pushInt(-stack.popInt())

			case opcode == 0x90: //OP_ABS
				if stack.size() < 1 {
					println("Stack too short for opcode", opcode)
					return false
				}
				a := stack.popInt()
				if a < 0 {
					stack.pushInt(-a)
				} else {
					stack.pushInt(a)
				}

			case opcode == 0x91: //OP_NOT
				if stack.size() < 1 {
					println("Stack too short for opcode", opcode)
					return false
				}
				stack.pushBool(stack.popInt() == 0)

			case opcode == 0x92: //OP_0NOTEQUAL
				if stack.size() < 1 {
					println("Stack too short for opcode", opcode)
					return false
				}
				stack.pushBool(stack.popInt() != 0)

			case opcode == 0x93: //OP_ADD
				if stack.size() < 2 {
					println("Stack too short for opcode", opcode)
					return false
				}
				stack.pushInt(stack.popInt() + stack.popInt())

			case opcode == 0x94: //OP_SUB
				if stack.size() < 2 {
					println("Stack too short for opcode", opcode)
					return false
				}
				a := stack.popInt()
				b := stack.popInt()
				stack.pushInt(a - b)

			case opcode == 0x9a: //OP_BOOLAND
				if stack.size() < 2 {
					println("Stack too short for opcode", opcode)
					return false
				}
				stack.pushBool(stack.popInt() != 0 && stack.popInt() != 0)

			case opcode == 0x9b: //OP_BOOLOR
				if stack.size() < 2 {
					println("Stack too short for opcode", opcode)
					return false
				}
				stack.pushBool(stack.popInt() != 0 || stack.popInt() != 0)

			case opcode == 0x9c || opcode == 0x9d: //OP_NUMEQUAL || OP_NUMEQUALVERIFY
				if stack.size() < 2 {
					println("Stack too short for opcode", opcode)
					return false
				}
				if opcode == 0x9d {
					return stack.popInt() == stack.popInt()
				} else {
					stack.pushBool(stack.popInt() == stack.popInt())
				}

			case opcode == 0x9e: //OP_NUMNOTEQUAL
				if stack.size() < 2 {
					println("Stack too short for opcode", opcode)
					return false
				}
				stack.pushBool(stack.popInt() != stack.popInt())

			case opcode == 0x9f: //OP_LESSTHAN
				if stack.size() < 2 {
					println("Stack too short for opcode", opcode)
					return false
				}
				a := stack.popInt()
				b := stack.popInt()
				stack.pushBool(a < b)

			case opcode == 0xa0: //OP_GREATERTHAN
				if stack.size() < 2 {
					println("Stack too short for opcode", opcode)
					return false
				}
				a := stack.popInt()
				b := stack.popInt()
				stack.pushBool(a > b)

			case opcode == 0xa1: //OP_LESSTHANOREQUAL
				if stack.size() < 2 {
					println("Stack too short for opcode", opcode)
					return false
				}
				a := stack.popInt()
				b := stack.popInt()
				stack.pushBool(a <= b)

			case opcode == 0xa2: //OP_GREATERTHANOREQUAL
				if stack.size() < 2 {
					println("Stack too short for opcode", opcode)
					return false
				}
				a := stack.popInt()
				b := stack.popInt()
				stack.pushBool(a >= b)

			case opcode == 0xa3: //OP_MIN
				if stack.size() < 2 {
					println("Stack too short for opcode", opcode)
					return false
				}
				a := stack.popInt()
				b := stack.popInt()
				if a < b {
					stack.pushInt(a)
				} else {
					stack.pushInt(b)
				}

			case opcode == 0xa4: //OP_MAX
				if stack.size() < 2 {
					println("Stack too short for opcode", opcode)
					return false
				}
				a := stack.popInt()
				b := stack.popInt()
				if a > b {
					stack.pushInt(a)
				} else {
					stack.pushInt(b)
				}

			case opcode == 0xa5: //OP_WITHIN
				if stack.size() < 3 {
					println("Stack too short for opcode", opcode)
					return false
				}
				x := stack.popInt()
				mi := stack.popInt()
				ma := stack.popInt()
				stack.pushBool(x >= mi && x < ma)

			case opcode == 0xa6: //OP_RIPEMD160
				if stack.size() < 1 {
					println("Stack too short for opcode", opcode)
					return false
				}
				rim := ripemd160.New()
				rim.Write(stack.pop()[:])
				stack.push(rim.Sum(nil)[:])

			case opcode == 0xa8: //OP_SHA256
				if stack.size() < 1 {
					println("Stack too short for opcode", opcode)
					return false
				}
				sha := sha256.New()
				sha.Write(stack.pop()[:])
				stack.push(sha.Sum(nil)[:])

			case opcode == 0xa9: //OP_HASH160
				if stack.size() < 1 {
					println("Stack too short for opcode", opcode)
					return false
				}
				rim160 := Rimp160AfterSha256(stack.pop())
				stack.push(rim160[:])

			case opcode == 0xaa: //OP_HASH256
				if stack.size() < 1 {
					println("Stack too short for opcode", opcode)
					return false
				}
				h := Sha2Sum(stack.pop())
				stack.push(h[:])

			case opcode == 0xab: // OP_CODESEPARATOR
				sta = idx

			case opcode == 0xac: // OP_CHECKSIG
				if stack.size() < 2 {
					println("Stack too short for opcode", opcode)
					return false
				}
				key, e := NewPublicKey(stack.pop())
				if e != nil {
					println(e.Error())
					return false
				}
				sig, e := NewSignature(stack.pop())
				if e != nil {
					println(e.Error())
					return false
				}
				return key.Verify(tx.SignatureHash(p[sta:], inp, sig.HashType), sig)

			case opcode == 0xae: //OP_CHECKMULTISIG
				//println("OP_CHECKMULTISIG ...")
				//stack.print()
				if stack.size() < 1 {
					println("OP_CHECKMULTISIG: Stack too short A")
					return false
				}
				i := 1
				nKeysCount := stack.topInt(-i)
				if nKeysCount < 0 || nKeysCount > 20 {
					println("OP_CHECKMULTISIG: Wrong number of keys")
					return false
				}
				nOpCount += nKeysCount
				if nOpCount > 201 {
					println("evalScript: too many opcodes B")
					return false
				}
				i++
				ikey := i
				i += nKeysCount
				if stack.size() < i {
					println("OP_CHECKMULTISIG: Stack too short B")
					return false
				}
				nSigsCount := stack.topInt(-i)
				if nSigsCount < 0 || nSigsCount > nKeysCount {
					println("OP_CHECKMULTISIG: nSigsCount error")
					return false
				}
				i++
				isig := i
				i += nSigsCount
				if stack.size() < i {
					println("OP_CHECKMULTISIG: Stack too short C")
					return false
				}
				fSuccess := true
				for nSigsCount > 0 {
					key, e := NewPublicKey(stack.top(-ikey))
					if e != nil {
						println(e.Error())
						return false
					}
					sig, e := NewSignature(stack.top(-isig))
					if e != nil {
						println(e.Error())
						return false
					}
					fOk := key.Verify(tx.SignatureHash(p[sta:], inp, sig.HashType), sig)

					if fOk {
						isig++
						nSigsCount--
					}
					ikey++
					nKeysCount--

					// If there are more signatures left than keys left,
					// then too many signatures have failed
					if nSigsCount > nKeysCount {
						fSuccess = false
					}
				}
				for i > 0 {
					i--
					stack.pop()
				}
				//stack.print()
				return fSuccess

			case opcode >= 0xb0 && opcode <= 0xb9: //OP_NOP
				// just do nothing

			case opcode >= 0xba: // inivalid opcode = invaid script
				println("fail tx because it contains invalid opcode", opcode)
				return false

			default:
				fmt.Printf("Unhandled opcode 0x%02x\n", opcode)
				stack.print()
				fmt.Println("Rest of the script:", hex.EncodeToString(p[idx:]))
				os.Exit(0)
			}
		}

		if don(DBG_SCRIPT) {
			stack.print()
		}
		if stack.size()+altstack.size() > 1000 {
			println("Stack too big")
			return false
		}
	}

	if vfExec.size() > 0 {
		println("Unfinished if..")
		return false
	}

	return true
}
Ejemplo n.º 23
0
func evalScript(p []byte, stack *scrStack, tx *Tx, inp int) bool {
	if don(DBG_SCRIPT) {
		println("script len", len(p))
	}

	if len(p) > 10000 {
		if don(DBG_SCRERR) {
			println("script too long", len(p))
		}
		return false
	}

	defer func() {
		if r := recover(); r != nil {
			if don(DBG_SCRERR) {
				err, ok := r.(error)
				if !ok {
					err = fmt.Errorf("pkg: %v", r)
				}
				println("evalScript panic:", err.Error())
			}
		}
	}()

	var vfExec scrStack
	var altstack scrStack
	sta, idx, opcnt := 0, 0, 0
	for idx < len(p) {
		fExec := vfExec.nofalse()

		// Read instruction
		opcode, vchPushValue, n, e := GetOpcode(p[idx:])
		if e != nil {
			println(e.Error())
			println("A", idx, hex.EncodeToString(p))
			return false
		}
		idx += n

		if don(DBG_SCRIPT) {
			fmt.Printf("\nExecuting opcode 0x%02x  n=%d  fExec:%t  push:%s..\n",
				opcode, n, fExec, hex.EncodeToString(vchPushValue))
			stack.print()
		}

		if vchPushValue != nil && len(vchPushValue) > MAX_SCRIPT_ELEMENT_SIZE {
			if don(DBG_SCRERR) {
				println("vchPushValue too long", len(vchPushValue))
			}
			return false
		}

		if opcode > 0x60 {
			opcnt++
			if opcnt > 201 {
				if don(DBG_SCRERR) {
					println("evalScript: too many opcodes A")
				}
				return false
			}
		}

		if opcode == 0x7e /*OP_CAT*/ ||
			opcode == 0x7f /*OP_SUBSTR*/ ||
			opcode == 0x80 /*OP_LEFT*/ ||
			opcode == 0x81 /*OP_RIGHT*/ ||
			opcode == 0x83 /*OP_INVERT*/ ||
			opcode == 0x84 /*OP_AND*/ ||
			opcode == 0x85 /*OP_OR*/ ||
			opcode == 0x86 /*OP_XOR*/ ||
			opcode == 0x8d /*OP_2MUL*/ ||
			opcode == 0x8e /*OP_2DIV*/ ||
			opcode == 0x95 /*OP_MUL*/ ||
			opcode == 0x96 /*OP_DIV*/ ||
			opcode == 0x97 /*OP_MOD*/ ||
			opcode == 0x98 /*OP_LSHIFT*/ ||
			opcode == 0x99 /*OP_RSHIFT*/ {
			if don(DBG_SCRERR) {
				println("Unsupported opcode", opcode)
			}
			return false
		}

		if fExec && 0 <= opcode && opcode <= OP_PUSHDATA4 {
			stack.push(vchPushValue)
			if don(DBG_SCRIPT) {
				fmt.Println("pushed", len(vchPushValue), "bytes")
			}
		} else if fExec || (0x63 /*OP_IF*/ <= opcode && opcode <= 0x68 /*OP_ENDIF*/) {
			switch {
			case opcode == 0x4f: // OP_1NEGATE
				stack.pushInt(-1)

			case opcode >= 0x51 && opcode <= 0x60: // OP_1-OP_16
				stack.pushInt(int64(opcode - 0x50))

			case opcode == 0x61: // OP_NOP
				// Do nothing

			/* - not handled
			OP_VER = 0x62
			*/

			case opcode == 0x63 || opcode == 0x64: //OP_IF || OP_NOTIF
				// <expression> if [statements] [else [statements]] endif
				fValue := false
				if fExec {
					if stack.size() < 1 {
						if don(DBG_SCRERR) {
							println("Stack too short for", opcode)
						}
						return false
					}
					if opcode == 0x63 /*OP_IF*/ {
						fValue = stack.popBool()
					} else {
						fValue = !stack.popBool()
					}
				}
				if don(DBG_SCRERR) {
					println(fExec, "if pushing", fValue, "...")
				}
				vfExec.pushBool(fValue)

			/* - not handled
			   OP_VERIF = 0x65,
			   OP_VERNOTIF = 0x66,
			*/
			case opcode == 0x67: //OP_ELSE
				if vfExec.size() == 0 {
					if don(DBG_SCRERR) {
						println("vfExec empty in OP_ELSE")
					}
				}
				vfExec.pushBool(!vfExec.popBool())

			case opcode == 0x68: //OP_ENDIF
				if vfExec.size() == 0 {
					if don(DBG_SCRERR) {
						println("vfExec empty in OP_ENDIF")
					}
				}
				vfExec.pop()

			case opcode == 0x69: //OP_VERIFY
				if stack.size() < 1 {
					if don(DBG_SCRERR) {
						println("Stack too short for opcode", opcode)
					}
					return false
				}
				if !stack.topBool(-1) {
					return false
				}
				stack.pop()

			case opcode == 0x6b: //OP_TOALTSTACK
				if stack.size() < 1 {
					if don(DBG_SCRERR) {
						println("Stack too short for opcode", opcode)
					}
					return false
				}
				altstack.push(stack.pop())

			case opcode == 0x6c: //OP_FROMALTSTACK
				if altstack.size() < 1 {
					if don(DBG_SCRERR) {
						println("AltStack too short for opcode", opcode)
					}
					return false
				}
				stack.push(altstack.pop())

			case opcode == 0x6d: //OP_2DROP
				if stack.size() < 2 {
					if don(DBG_SCRERR) {
						println("Stack too short for opcode", opcode)
					}
					return false
				}
				stack.pop()
				stack.pop()

			case opcode == 0x6e: //OP_2DUP
				if stack.size() < 2 {
					if don(DBG_SCRERR) {
						println("Stack too short for opcode", opcode)
					}
					return false
				}
				x1 := stack.top(-1)
				x2 := stack.top(-2)
				stack.push(x2)
				stack.push(x1)

			case opcode == 0x6f: //OP_3DUP
				if stack.size() < 3 {
					if don(DBG_SCRERR) {
						println("Stack too short for opcode", opcode)
					}
					return false
				}
				x1 := stack.top(-3)
				x2 := stack.top(-2)
				x3 := stack.top(-1)
				stack.push(x1)
				stack.push(x2)
				stack.push(x3)

			case opcode == 0x70: //OP_2OVER
				if stack.size() < 4 {
					if don(DBG_SCRERR) {
						println("Stack too short for opcode", opcode)
					}
					return false
				}
				x1 := stack.top(-4)
				x2 := stack.top(-3)
				stack.push(x1)
				stack.push(x2)

			case opcode == 0x71: //OP_2ROT
				// (x1 x2 x3 x4 x5 x6 -- x3 x4 x5 x6 x1 x2)
				if stack.size() < 6 {
					if don(DBG_SCRERR) {
						println("Stack too short for opcode", opcode)
					}
					return false
				}
				x6 := stack.pop()
				x5 := stack.pop()
				x4 := stack.pop()
				x3 := stack.pop()
				x2 := stack.pop()
				x1 := stack.pop()
				stack.push(x3)
				stack.push(x4)
				stack.push(x5)
				stack.push(x6)
				stack.push(x1)
				stack.push(x2)

			case opcode == 0x72: //OP_2SWAP
				// (x1 x2 x3 x4 -- x3 x4 x1 x2)
				if stack.size() < 4 {
					if don(DBG_SCRERR) {
						println("Stack too short for opcode", opcode)
					}
					return false
				}
				x4 := stack.pop()
				x3 := stack.pop()
				x2 := stack.pop()
				x1 := stack.pop()
				stack.push(x3)
				stack.push(x4)
				stack.push(x1)
				stack.push(x2)

			case opcode == 0x73: //OP_IFDUP
				if stack.size() < 1 {
					if don(DBG_SCRERR) {
						println("Stack too short for opcode", opcode)
					}
					return false
				}
				if stack.topBool(-1) {
					stack.push(stack.top(-1))
				}

			case opcode == 0x74: //OP_DEPTH
				stack.pushInt(int64(stack.size()))

			case opcode == 0x75: //OP_DROP
				if stack.size() < 1 {
					if don(DBG_SCRERR) {
						println("Stack too short for opcode", opcode)
					}
					return false
				}
				stack.pop()

			case opcode == 0x76: //OP_DUP
				if stack.size() < 1 {
					if don(DBG_SCRERR) {
						println("Stack too short for opcode", opcode)
					}
					return false
				}
				el := stack.pop()
				stack.push(el)
				stack.push(el)

			case opcode == 0x77: //OP_NIP
				if stack.size() < 2 {
					if don(DBG_SCRERR) {
						println("Stack too short for opcode", opcode)
					}
					return false
				}
				x := stack.pop()
				stack.pop()
				stack.push(x)

			case opcode == 0x78: //OP_OVER
				if stack.size() < 2 {
					if don(DBG_SCRERR) {
						println("Stack too short for opcode", opcode)
					}
					return false
				}
				stack.push(stack.top(-2))

			case opcode == 0x79 || opcode == 0x7a: //OP_PICK || OP_ROLL
				if stack.size() < 2 {
					if don(DBG_SCRERR) {
						println("Stack too short for opcode", opcode)
					}
					return false
				}
				n := stack.popInt()
				if n < 0 || n >= int64(stack.size()) {
					if don(DBG_SCRERR) {
						println("Wrong n for opcode", opcode)
					}
					return false
				}
				if opcode == 0x79 /*OP_PICK*/ {
					stack.push(stack.top(int(-1 - n)))
				} else if n > 0 {
					tmp := make([][]byte, n)
					for i := range tmp {
						tmp[i] = stack.pop()
					}
					xn := stack.pop()
					for i := len(tmp) - 1; i >= 0; i-- {
						stack.push(tmp[i])
					}
					stack.push(xn)
				}

			case opcode == 0x7b: //OP_ROT
				if stack.size() < 3 {
					if don(DBG_SCRERR) {
						println("Stack too short for opcode", opcode)
					}
					return false
				}
				x3 := stack.pop()
				x2 := stack.pop()
				x1 := stack.pop()
				stack.push(x2)
				stack.push(x3)
				stack.push(x1)

			case opcode == 0x7c: //OP_SWAP
				if stack.size() < 2 {
					if don(DBG_SCRERR) {
						println("Stack too short for opcode", opcode)
					}
					return false
				}
				x1 := stack.pop()
				x2 := stack.pop()
				stack.push(x1)
				stack.push(x2)

			case opcode == 0x7d: //OP_TUCK
				if stack.size() < 2 {
					if don(DBG_SCRERR) {
						println("Stack too short for opcode", opcode)
					}
					return false
				}
				x1 := stack.pop()
				x2 := stack.pop()
				stack.push(x1)
				stack.push(x2)
				stack.push(x1)

			case opcode == 0x82: //OP_SIZE
				if stack.size() < 1 {
					if don(DBG_SCRERR) {
						println("Stack too short for opcode", opcode)
					}
					return false
				}
				stack.pushInt(int64(len(stack.top(-1))))

			case opcode == 0x87 || opcode == 0x88: //OP_EQUAL || OP_EQUALVERIFY
				if stack.size() < 2 {
					if don(DBG_SCRERR) {
						println("Stack too short for opcode", opcode)
					}
					return false
				}
				a := stack.pop()
				b := stack.pop()
				if opcode == 0x88 { //OP_EQUALVERIFY
					if !bytes.Equal(a, b) {
						return false
					}
				} else {
					stack.pushBool(bytes.Equal(a, b))
				}

			/* - not handled
			OP_RESERVED1 = 0x89,
			OP_RESERVED2 = 0x8a,
			*/

			case opcode == 0x8b: //OP_1ADD
				if stack.size() < 1 {
					if don(DBG_SCRERR) {
						println("Stack too short for opcode", opcode)
					}
					return false
				}
				stack.pushInt(stack.popInt() + 1)

			case opcode == 0x8c: //OP_1SUB
				if stack.size() < 1 {
					if don(DBG_SCRERR) {
						println("Stack too short for opcode", opcode)
					}
					return false
				}
				stack.pushInt(stack.popInt() - 1)

			case opcode == 0x8f: //OP_NEGATE
				if stack.size() < 1 {
					if don(DBG_SCRERR) {
						println("Stack too short for opcode", opcode)
					}
					return false
				}
				stack.pushInt(-stack.popInt())

			case opcode == 0x90: //OP_ABS
				if stack.size() < 1 {
					if don(DBG_SCRERR) {
						println("Stack too short for opcode", opcode)
					}
					return false
				}
				a := stack.popInt()
				if a < 0 {
					stack.pushInt(-a)
				} else {
					stack.pushInt(a)
				}

			case opcode == 0x91: //OP_NOT
				if stack.size() < 1 {
					if don(DBG_SCRERR) {
						println("Stack too short for opcode", opcode)
					}
					return false
				}
				stack.pushBool(stack.popInt() == 0)

			case opcode == 0x92: //OP_0NOTEQUAL
				if stack.size() < 1 {
					if don(DBG_SCRERR) {
						println("Stack too short for opcode", opcode)
					}
					return false
				}
				stack.pushBool(stack.popBool())

			case opcode == 0x93 || //OP_ADD
				opcode == 0x94 || //OP_SUB
				opcode == 0x9a || //OP_BOOLAND
				opcode == 0x9b || //OP_BOOLOR
				opcode == 0x9c || opcode == 0x9d || //OP_NUMEQUAL || OP_NUMEQUALVERIFY
				opcode == 0x9e || //OP_NUMNOTEQUAL
				opcode == 0x9f || //OP_LESSTHAN
				opcode == 0xa0 || //OP_GREATERTHAN
				opcode == 0xa1 || //OP_LESSTHANOREQUAL
				opcode == 0xa2 || //OP_GREATERTHANOREQUAL
				opcode == 0xa3 || //OP_MIN
				opcode == 0xa4: //OP_MAX
				if stack.size() < 2 {
					if don(DBG_SCRERR) {
						println("Stack too short for opcode", opcode)
					}
					return false
				}
				bn2 := stack.popInt()
				bn1 := stack.popInt()
				var bn int64
				switch opcode {
				case 0x93:
					bn = bn1 + bn2 // OP_ADD
				case 0x94:
					bn = bn1 - bn2 // OP_SUB
				case 0x9a:
					bn = b2i(bn1 != 0 && bn2 != 0) // OP_BOOLAND
				case 0x9b:
					bn = b2i(bn1 != 0 || bn2 != 0) // OP_BOOLOR
				case 0x9c:
					bn = b2i(bn1 == bn2) // OP_NUMEQUAL
				case 0x9d:
					bn = b2i(bn1 == bn2) // OP_NUMEQUALVERIFY
				case 0x9e:
					bn = b2i(bn1 != bn2) // OP_NUMNOTEQUAL
				case 0x9f:
					bn = b2i(bn1 < bn2) // OP_LESSTHAN
				case 0xa0:
					bn = b2i(bn1 > bn2) // OP_GREATERTHAN
				case 0xa1:
					bn = b2i(bn1 <= bn2) // OP_LESSTHANOREQUAL
				case 0xa2:
					bn = b2i(bn1 >= bn2) // OP_GREATERTHANOREQUAL
				case 0xa3: // OP_MIN
					if bn1 < bn2 {
						bn = bn1
					} else {
						bn = bn2
					}
				case 0xa4: // OP_MAX
					if bn1 > bn2 {
						bn = bn1
					} else {
						bn = bn2
					}
				default:
					panic("invalid opcode")
				}
				if opcode == 0x9d { //OP_NUMEQUALVERIFY
					if bn == 0 {
						return false
					}
				} else {
					stack.pushInt(bn)
				}

			case opcode == 0xa5: //OP_WITHIN
				if stack.size() < 3 {
					if don(DBG_SCRERR) {
						println("Stack too short for opcode", opcode)
					}
					return false
				}
				bn3 := stack.popInt()
				bn2 := stack.popInt()
				bn1 := stack.popInt()
				stack.pushBool(bn2 <= bn1 && bn1 < bn3)

			case opcode == 0xa6: //OP_RIPEMD160
				if stack.size() < 1 {
					if don(DBG_SCRERR) {
						println("Stack too short for opcode", opcode)
					}
					return false
				}
				rim := ripemd160.New()
				rim.Write(stack.pop()[:])
				stack.push(rim.Sum(nil)[:])

			case opcode == 0xa7: //OP_SHA1
				if stack.size() < 1 {
					if don(DBG_SCRERR) {
						println("Stack too short for opcode", opcode)
					}
					return false
				}
				sha := sha1.New()
				sha.Write(stack.pop()[:])
				stack.push(sha.Sum(nil)[:])

			case opcode == 0xa8: //OP_SHA256
				if stack.size() < 1 {
					if don(DBG_SCRERR) {
						println("Stack too short for opcode", opcode)
					}
					return false
				}
				sha := sha256.New()
				sha.Write(stack.pop()[:])
				stack.push(sha.Sum(nil)[:])

			case opcode == 0xa9: //OP_HASH160
				if stack.size() < 1 {
					if don(DBG_SCRERR) {
						println("Stack too short for opcode", opcode)
					}
					return false
				}
				rim160 := Rimp160AfterSha256(stack.pop())
				stack.push(rim160[:])

			case opcode == 0xaa: //OP_HASH256
				if stack.size() < 1 {
					if don(DBG_SCRERR) {
						println("Stack too short for opcode", opcode)
					}
					return false
				}
				h := Sha2Sum(stack.pop())
				stack.push(h[:])

			case opcode == 0xab: // OP_CODESEPARATOR
				sta = idx

			case opcode == 0xac || opcode == 0xad: // OP_CHECKSIG || OP_CHECKSIGVERIFY
				if stack.size() < 2 {
					if don(DBG_SCRERR) {
						println("Stack too short for opcode", opcode)
					}
					return false
				}
				var ok bool
				pk := stack.pop()
				si := stack.pop()
				if len(si) > 9 {
					sh := tx.SignatureHash(delSig(p[sta:], si), inp, si[len(si)-1])
					ok = EcdsaVerify(pk, si, sh)
					if !ok && don(DBG_SCRERR) {
						println("EcdsaVerify fail 1")
					}
				}
				if don(DBG_SCRIPT) {
					println("ver:", ok)
				}
				if opcode == 0xad {
					if !ok { // OP_CHECKSIGVERIFY
						return false
					}
				} else { // OP_CHECKSIG
					stack.pushBool(ok)
				}

			case opcode == 0xae || opcode == 0xaf: //OP_CHECKMULTISIG || OP_CHECKMULTISIGVERIFY
				//println("OP_CHECKMULTISIG ...")
				//stack.print()
				if stack.size() < 1 {
					if don(DBG_SCRERR) {
						println("OP_CHECKMULTISIG: Stack too short A")
					}
					return false
				}
				i := 1
				keyscnt := stack.topInt(-i)
				if keyscnt < 0 || keyscnt > 20 {
					println("OP_CHECKMULTISIG: Wrong number of keys")
					return false
				}
				opcnt += int(keyscnt)
				if opcnt > 201 {
					println("evalScript: too many opcodes B")
					return false
				}
				i++
				ikey := i
				i += int(keyscnt)
				if stack.size() < i {
					if don(DBG_SCRERR) {
						println("OP_CHECKMULTISIG: Stack too short B")
					}
					return false
				}
				sigscnt := stack.topInt(-i)
				if sigscnt < 0 || sigscnt > keyscnt {
					println("OP_CHECKMULTISIG: sigscnt error")
					return false
				}
				i++
				isig := i
				i += int(sigscnt)
				if stack.size() < i {
					if don(DBG_SCRERR) {
						println("OP_CHECKMULTISIG: Stack too short C")
					}
					return false
				}

				xxx := p[sta:]
				for k := 0; k < int(sigscnt); k++ {
					xxx = delSig(xxx, stack.top(-isig-k))
				}

				success := true
				for sigscnt > 0 {
					pk := stack.top(-ikey)
					si := stack.top(-isig)
					if len(si) > 9 && ((len(pk) == 65 && pk[0] == 4) || (len(pk) == 33 && (pk[0]|1) == 3)) {
						sh := tx.SignatureHash(xxx, inp, si[len(si)-1])
						if EcdsaVerify(pk, si, sh) {
							isig++
							sigscnt--
						}
					}

					ikey++
					keyscnt--

					// If there are more signatures left than keys left,
					// then too many signatures have failed
					if sigscnt > keyscnt {
						success = false
						break
					}
				}
				for i > 0 {
					i--
					stack.pop()
				}
				if opcode == 0xaf {
					if !success { // OP_CHECKMULTISIGVERIFY
						return false
					}
				} else {
					stack.pushBool(success)
				}

			case opcode >= 0xb0 && opcode <= 0xb9: //OP_NOP
				// just do nothing

			default:
				if don(DBG_SCRERR) {
					fmt.Printf("Unhandled opcode 0x%02x - a handler must be implemented\n", opcode)
					stack.print()
					fmt.Println("Rest of the script:", hex.EncodeToString(p[idx:]))
				}
				return false
			}
		}

		if don(DBG_SCRIPT) {
			fmt.Printf("Finished Executing opcode 0x%02x\n", opcode)
			stack.print()
		}
		if stack.size()+altstack.size() > 1000 {
			if don(DBG_SCRERR) {
				println("Stack too big")
			}
			return false
		}
	}

	if don(DBG_SCRIPT) {
		fmt.Println("END OF SCRIPT")
		stack.print()
	}

	if vfExec.size() > 0 {
		if don(DBG_SCRERR) {
			println("Unfinished if..")
		}
		return false
	}

	return true
}
Ejemplo n.º 24
0
func Ripemd160(data []byte) []byte {
	ripemd := ripemd160.New()
	ripemd.Write(data)

	return ripemd.Sum(nil)
}
Ejemplo n.º 25
0
func evalScript(p []byte, stack *scrStack, tx *btc.Tx, inp int, ver_flags uint32) bool {
	if DBG_SCR {
		fmt.Println("script len", len(p))
	}

	if len(p) > 10000 {
		if DBG_ERR {
			fmt.Println("script too long", len(p))
		}
		return false
	}

	defer func() {
		if r := recover(); r != nil {
			if DBG_ERR {
				err, ok := r.(error)
				if !ok {
					err = fmt.Errorf("pkg: %v", r)
				}
				fmt.Println("evalScript panic:", err.Error())
				fmt.Println(string(debug.Stack()))
			}
		}
	}()

	var exestack scrStack
	var altstack scrStack
	sta, idx, opcnt := 0, 0, 0
	checkMinVals := (ver_flags & VER_MINDATA) != 0
	for idx < len(p) {
		inexec := exestack.nofalse()

		// Read instruction
		opcode, pushval, n, e := btc.GetOpcode(p[idx:])
		if e != nil {
			//fmt.Println(e.Error())
			//fmt.Println("A", idx, hex.EncodeToString(p))
			return false
		}
		idx += n

		if DBG_SCR {
			fmt.Printf("\nExecuting opcode 0x%02x  n=%d  inexec:%t  push:%s..\n",
				opcode, n, inexec, hex.EncodeToString(pushval))
			stack.print()
		}

		if pushval != nil && len(pushval) > btc.MAX_SCRIPT_ELEMENT_SIZE {
			if DBG_ERR {
				fmt.Println("pushval too long", len(pushval))
			}
			return false
		}

		if opcode > 0x60 {
			opcnt++
			if opcnt > 201 {
				if DBG_ERR {
					fmt.Println("evalScript: too many opcodes A")
				}
				return false
			}
		}

		if opcode == 0x7e /*OP_CAT*/ ||
			opcode == 0x7f /*OP_SUBSTR*/ ||
			opcode == 0x80 /*OP_LEFT*/ ||
			opcode == 0x81 /*OP_RIGHT*/ ||
			opcode == 0x83 /*OP_INVERT*/ ||
			opcode == 0x84 /*OP_AND*/ ||
			opcode == 0x85 /*OP_OR*/ ||
			opcode == 0x86 /*OP_XOR*/ ||
			opcode == 0x8d /*OP_2MUL*/ ||
			opcode == 0x8e /*OP_2DIV*/ ||
			opcode == 0x95 /*OP_MUL*/ ||
			opcode == 0x96 /*OP_DIV*/ ||
			opcode == 0x97 /*OP_MOD*/ ||
			opcode == 0x98 /*OP_LSHIFT*/ ||
			opcode == 0x99 /*OP_RSHIFT*/ {
			if DBG_ERR {
				fmt.Println("Unsupported opcode", opcode)
			}
			return false
		}

		if inexec && 0 <= opcode && opcode <= btc.OP_PUSHDATA4 {
			if checkMinVals && !checkMinimalPush(pushval, opcode) {
				if DBG_ERR {
					fmt.Println("Push value not in a minimal format", hex.EncodeToString(pushval))
				}
				return false
			}
			stack.push(pushval)
			if DBG_SCR {
				fmt.Println("pushed", len(pushval), "bytes")
			}
		} else if inexec || (0x63 /*OP_IF*/ <= opcode && opcode <= 0x68 /*OP_ENDIF*/) {
			switch {
			case opcode == 0x4f: // OP_1NEGATE
				stack.pushInt(-1)

			case opcode >= 0x51 && opcode <= 0x60: // OP_1-OP_16
				stack.pushInt(int64(opcode - 0x50))

			case opcode == 0x61: // OP_NOP
				// Do nothing

			/* - not handled
			OP_VER = 0x62
			*/

			case opcode == 0x63 || opcode == 0x64: //OP_IF || OP_NOTIF
				// <expression> if [statements] [else [statements]] endif
				val := false
				if inexec {
					if stack.size() < 1 {
						if DBG_ERR {
							fmt.Println("Stack too short for", opcode)
						}
						return false
					}
					if opcode == 0x63 /*OP_IF*/ {
						val = stack.popBool()
					} else {
						val = !stack.popBool()
					}
				}
				if DBG_SCR {
					fmt.Println(inexec, "if pushing", val, "...")
				}
				exestack.pushBool(val)

			/* - not handled
			   OP_VERIF = 0x65,
			   OP_VERNOTIF = 0x66,
			*/
			case opcode == 0x67: //OP_ELSE
				if exestack.size() == 0 {
					if DBG_ERR {
						fmt.Println("exestack empty in OP_ELSE")
					}
				}
				exestack.pushBool(!exestack.popBool())

			case opcode == 0x68: //OP_ENDIF
				if exestack.size() == 0 {
					if DBG_ERR {
						fmt.Println("exestack empty in OP_ENDIF")
					}
				}
				exestack.pop()

			case opcode == 0x69: //OP_VERIFY
				if stack.size() < 1 {
					if DBG_ERR {
						fmt.Println("Stack too short for opcode", opcode)
					}
					return false
				}
				if !stack.topBool(-1) {
					return false
				}
				stack.pop()

			case opcode == 0x6b: //OP_TOALTSTACK
				if stack.size() < 1 {
					if DBG_ERR {
						fmt.Println("Stack too short for opcode", opcode)
					}
					return false
				}
				altstack.push(stack.pop())

			case opcode == 0x6c: //OP_FROMALTSTACK
				if altstack.size() < 1 {
					if DBG_ERR {
						fmt.Println("AltStack too short for opcode", opcode)
					}
					return false
				}
				stack.push(altstack.pop())

			case opcode == 0x6d: //OP_2DROP
				if stack.size() < 2 {
					if DBG_ERR {
						fmt.Println("Stack too short for opcode", opcode)
					}
					return false
				}
				stack.pop()
				stack.pop()

			case opcode == 0x6e: //OP_2DUP
				if stack.size() < 2 {
					if DBG_ERR {
						fmt.Println("Stack too short for opcode", opcode)
					}
					return false
				}
				x1 := stack.top(-1)
				x2 := stack.top(-2)
				stack.push(x2)
				stack.push(x1)

			case opcode == 0x6f: //OP_3DUP
				if stack.size() < 3 {
					if DBG_ERR {
						fmt.Println("Stack too short for opcode", opcode)
					}
					return false
				}
				x1 := stack.top(-3)
				x2 := stack.top(-2)
				x3 := stack.top(-1)
				stack.push(x1)
				stack.push(x2)
				stack.push(x3)

			case opcode == 0x70: //OP_2OVER
				if stack.size() < 4 {
					if DBG_ERR {
						fmt.Println("Stack too short for opcode", opcode)
					}
					return false
				}
				x1 := stack.top(-4)
				x2 := stack.top(-3)
				stack.push(x1)
				stack.push(x2)

			case opcode == 0x71: //OP_2ROT
				// (x1 x2 x3 x4 x5 x6 -- x3 x4 x5 x6 x1 x2)
				if stack.size() < 6 {
					if DBG_ERR {
						fmt.Println("Stack too short for opcode", opcode)
					}
					return false
				}
				x6 := stack.pop()
				x5 := stack.pop()
				x4 := stack.pop()
				x3 := stack.pop()
				x2 := stack.pop()
				x1 := stack.pop()
				stack.push(x3)
				stack.push(x4)
				stack.push(x5)
				stack.push(x6)
				stack.push(x1)
				stack.push(x2)

			case opcode == 0x72: //OP_2SWAP
				// (x1 x2 x3 x4 -- x3 x4 x1 x2)
				if stack.size() < 4 {
					if DBG_ERR {
						fmt.Println("Stack too short for opcode", opcode)
					}
					return false
				}
				x4 := stack.pop()
				x3 := stack.pop()
				x2 := stack.pop()
				x1 := stack.pop()
				stack.push(x3)
				stack.push(x4)
				stack.push(x1)
				stack.push(x2)

			case opcode == 0x73: //OP_IFDUP
				if stack.size() < 1 {
					if DBG_ERR {
						fmt.Println("Stack too short for opcode", opcode)
					}
					return false
				}
				if stack.topBool(-1) {
					stack.push(stack.top(-1))
				}

			case opcode == 0x74: //OP_DEPTH
				stack.pushInt(int64(stack.size()))

			case opcode == 0x75: //OP_DROP
				if stack.size() < 1 {
					if DBG_ERR {
						fmt.Println("Stack too short for opcode", opcode)
					}
					return false
				}
				stack.pop()

			case opcode == 0x76: //OP_DUP
				if stack.size() < 1 {
					if DBG_ERR {
						fmt.Println("Stack too short for opcode", opcode)
					}
					return false
				}
				el := stack.pop()
				stack.push(el)
				stack.push(el)

			case opcode == 0x77: //OP_NIP
				if stack.size() < 2 {
					if DBG_ERR {
						fmt.Println("Stack too short for opcode", opcode)
					}
					return false
				}
				x := stack.pop()
				stack.pop()
				stack.push(x)

			case opcode == 0x78: //OP_OVER
				if stack.size() < 2 {
					if DBG_ERR {
						fmt.Println("Stack too short for opcode", opcode)
					}
					return false
				}
				stack.push(stack.top(-2))

			case opcode == 0x79 || opcode == 0x7a: //OP_PICK || OP_ROLL
				if stack.size() < 2 {
					if DBG_ERR {
						fmt.Println("Stack too short for opcode", opcode)
					}
					return false
				}
				n := stack.popInt(checkMinVals)
				if n < 0 || n >= int64(stack.size()) {
					if DBG_ERR {
						fmt.Println("Wrong n for opcode", opcode)
					}
					return false
				}
				if opcode == 0x79 /*OP_PICK*/ {
					stack.push(stack.top(int(-1 - n)))
				} else if n > 0 {
					tmp := make([][]byte, n)
					for i := range tmp {
						tmp[i] = stack.pop()
					}
					xn := stack.pop()
					for i := len(tmp) - 1; i >= 0; i-- {
						stack.push(tmp[i])
					}
					stack.push(xn)
				}

			case opcode == 0x7b: //OP_ROT
				if stack.size() < 3 {
					if DBG_ERR {
						fmt.Println("Stack too short for opcode", opcode)
					}
					return false
				}
				x3 := stack.pop()
				x2 := stack.pop()
				x1 := stack.pop()
				stack.push(x2)
				stack.push(x3)
				stack.push(x1)

			case opcode == 0x7c: //OP_SWAP
				if stack.size() < 2 {
					if DBG_ERR {
						fmt.Println("Stack too short for opcode", opcode)
					}
					return false
				}
				x1 := stack.pop()
				x2 := stack.pop()
				stack.push(x1)
				stack.push(x2)

			case opcode == 0x7d: //OP_TUCK
				if stack.size() < 2 {
					if DBG_ERR {
						fmt.Println("Stack too short for opcode", opcode)
					}
					return false
				}
				x1 := stack.pop()
				x2 := stack.pop()
				stack.push(x1)
				stack.push(x2)
				stack.push(x1)

			case opcode == 0x82: //OP_SIZE
				if stack.size() < 1 {
					if DBG_ERR {
						fmt.Println("Stack too short for opcode", opcode)
					}
					return false
				}
				stack.pushInt(int64(len(stack.top(-1))))

			case opcode == 0x87 || opcode == 0x88: //OP_EQUAL || OP_EQUALVERIFY
				if stack.size() < 2 {
					if DBG_ERR {
						fmt.Println("Stack too short for opcode", opcode)
					}
					return false
				}
				a := stack.pop()
				b := stack.pop()
				if opcode == 0x88 { //OP_EQUALVERIFY
					if !bytes.Equal(a, b) {
						return false
					}
				} else {
					stack.pushBool(bytes.Equal(a, b))
				}

			/* - not handled
			OP_RESERVED1 = 0x89,
			OP_RESERVED2 = 0x8a,
			*/

			case opcode == 0x8b: //OP_1ADD
				if stack.size() < 1 {
					if DBG_ERR {
						fmt.Println("Stack too short for opcode", opcode)
					}
					return false
				}
				stack.pushInt(stack.popInt(checkMinVals) + 1)

			case opcode == 0x8c: //OP_1SUB
				if stack.size() < 1 {
					if DBG_ERR {
						fmt.Println("Stack too short for opcode", opcode)
					}
					return false
				}
				stack.pushInt(stack.popInt(checkMinVals) - 1)

			case opcode == 0x8f: //OP_NEGATE
				if stack.size() < 1 {
					if DBG_ERR {
						fmt.Println("Stack too short for opcode", opcode)
					}
					return false
				}
				stack.pushInt(-stack.popInt(checkMinVals))

			case opcode == 0x90: //OP_ABS
				if stack.size() < 1 {
					if DBG_ERR {
						fmt.Println("Stack too short for opcode", opcode)
					}
					return false
				}
				a := stack.popInt(checkMinVals)
				if a < 0 {
					stack.pushInt(-a)
				} else {
					stack.pushInt(a)
				}

			case opcode == 0x91: //OP_NOT
				if stack.size() < 1 {
					if DBG_ERR {
						fmt.Println("Stack too short for opcode", opcode)
					}
					return false
				}
				stack.pushBool(stack.popInt(checkMinVals) == 0)

			case opcode == 0x92: //OP_0NOTEQUAL
				if stack.size() < 1 {
					if DBG_ERR {
						fmt.Println("Stack too short for opcode", opcode)
					}
					return false
				}
				d := stack.pop()
				if checkMinVals && len(d) > 1 {
					if DBG_ERR {
						fmt.Println("Not minimal bool value", hex.EncodeToString(d))
					}
					return false
				}
				stack.pushBool(bts2bool(d))

			case opcode == 0x93 || //OP_ADD
				opcode == 0x94 || //OP_SUB
				opcode == 0x9a || //OP_BOOLAND
				opcode == 0x9b || //OP_BOOLOR
				opcode == 0x9c || opcode == 0x9d || //OP_NUMEQUAL || OP_NUMEQUALVERIFY
				opcode == 0x9e || //OP_NUMNOTEQUAL
				opcode == 0x9f || //OP_LESSTHAN
				opcode == 0xa0 || //OP_GREATERTHAN
				opcode == 0xa1 || //OP_LESSTHANOREQUAL
				opcode == 0xa2 || //OP_GREATERTHANOREQUAL
				opcode == 0xa3 || //OP_MIN
				opcode == 0xa4: //OP_MAX
				if stack.size() < 2 {
					if DBG_ERR {
						fmt.Println("Stack too short for opcode", opcode)
					}
					return false
				}
				bn2 := stack.popInt(checkMinVals)
				bn1 := stack.popInt(checkMinVals)
				var bn int64
				switch opcode {
				case 0x93:
					bn = bn1 + bn2 // OP_ADD
				case 0x94:
					bn = bn1 - bn2 // OP_SUB
				case 0x9a:
					bn = b2i(bn1 != 0 && bn2 != 0) // OP_BOOLAND
				case 0x9b:
					bn = b2i(bn1 != 0 || bn2 != 0) // OP_BOOLOR
				case 0x9c:
					bn = b2i(bn1 == bn2) // OP_NUMEQUAL
				case 0x9d:
					bn = b2i(bn1 == bn2) // OP_NUMEQUALVERIFY
				case 0x9e:
					bn = b2i(bn1 != bn2) // OP_NUMNOTEQUAL
				case 0x9f:
					bn = b2i(bn1 < bn2) // OP_LESSTHAN
				case 0xa0:
					bn = b2i(bn1 > bn2) // OP_GREATERTHAN
				case 0xa1:
					bn = b2i(bn1 <= bn2) // OP_LESSTHANOREQUAL
				case 0xa2:
					bn = b2i(bn1 >= bn2) // OP_GREATERTHANOREQUAL
				case 0xa3: // OP_MIN
					if bn1 < bn2 {
						bn = bn1
					} else {
						bn = bn2
					}
				case 0xa4: // OP_MAX
					if bn1 > bn2 {
						bn = bn1
					} else {
						bn = bn2
					}
				default:
					panic("invalid opcode")
				}
				if opcode == 0x9d { //OP_NUMEQUALVERIFY
					if bn == 0 {
						return false
					}
				} else {
					stack.pushInt(bn)
				}

			case opcode == 0xa5: //OP_WITHIN
				if stack.size() < 3 {
					if DBG_ERR {
						fmt.Println("Stack too short for opcode", opcode)
					}
					return false
				}
				bn3 := stack.popInt(checkMinVals)
				bn2 := stack.popInt(checkMinVals)
				bn1 := stack.popInt(checkMinVals)
				stack.pushBool(bn2 <= bn1 && bn1 < bn3)

			case opcode == 0xa6: //OP_RIPEMD160
				if stack.size() < 1 {
					if DBG_ERR {
						fmt.Println("Stack too short for opcode", opcode)
					}
					return false
				}
				rim := ripemd160.New()
				rim.Write(stack.pop()[:])
				stack.push(rim.Sum(nil)[:])

			case opcode == 0xa7: //OP_SHA1
				if stack.size() < 1 {
					if DBG_ERR {
						fmt.Println("Stack too short for opcode", opcode)
					}
					return false
				}
				sha := sha1.New()
				sha.Write(stack.pop()[:])
				stack.push(sha.Sum(nil)[:])

			case opcode == 0xa8: //OP_SHA256
				if stack.size() < 1 {
					if DBG_ERR {
						fmt.Println("Stack too short for opcode", opcode)
					}
					return false
				}
				sha := sha256.New()
				sha.Write(stack.pop()[:])
				stack.push(sha.Sum(nil)[:])

			case opcode == 0xa9: //OP_HASH160
				if stack.size() < 1 {
					if DBG_ERR {
						fmt.Println("Stack too short for opcode", opcode)
					}
					return false
				}
				rim160 := btc.Rimp160AfterSha256(stack.pop())
				stack.push(rim160[:])

			case opcode == 0xaa: //OP_HASH256
				if stack.size() < 1 {
					if DBG_ERR {
						fmt.Println("Stack too short for opcode", opcode)
					}
					return false
				}
				h := btc.Sha2Sum(stack.pop())
				stack.push(h[:])

			case opcode == 0xab: // OP_CODESEPARATOR
				sta = idx

			case opcode == 0xac || opcode == 0xad: // OP_CHECKSIG || OP_CHECKSIGVERIFY

				if stack.size() < 2 {
					if DBG_ERR {
						fmt.Println("Stack too short for opcode", opcode)
					}
					return false
				}
				var ok bool
				pk := stack.pop()
				si := stack.pop()

				// BIP-0066
				if !CheckSignatureEncoding(si, ver_flags) {
					if DBG_ERR {
						fmt.Println("Invalid Signature Encoding A")
					}
					return false
				}

				if len(si) > 0 {
					sh := tx.SignatureHash(delSig(p[sta:], si), inp, int32(si[len(si)-1]))
					ok = btc.EcdsaVerify(pk, si, sh)
				}
				if !ok && DBG_ERR {
					if DBG_ERR {
						fmt.Println("EcdsaVerify fail 1")
					}
				}

				if DBG_SCR {
					fmt.Println("ver:", ok)
				}
				if opcode == 0xad {
					if !ok { // OP_CHECKSIGVERIFY
						return false
					}
				} else { // OP_CHECKSIG
					stack.pushBool(ok)
				}

			case opcode == 0xae || opcode == 0xaf: //OP_CHECKMULTISIG || OP_CHECKMULTISIGVERIFY
				//fmt.Println("OP_CHECKMULTISIG ...")
				//stack.print()
				if stack.size() < 1 {
					if DBG_ERR {
						fmt.Println("OP_CHECKMULTISIG: Stack too short A")
					}
					return false
				}
				i := 1
				keyscnt := stack.topInt(-i, checkMinVals)
				if keyscnt < 0 || keyscnt > 20 {
					fmt.Println("OP_CHECKMULTISIG: Wrong number of keys")
					return false
				}
				opcnt += int(keyscnt)
				if opcnt > 201 {
					if DBG_ERR {
						fmt.Println("evalScript: too many opcodes B")
					}
					return false
				}
				i++
				ikey := i
				i += int(keyscnt)
				if stack.size() < i {
					if DBG_ERR {
						fmt.Println("OP_CHECKMULTISIG: Stack too short B")
					}
					return false
				}
				sigscnt := stack.topInt(-i, checkMinVals)
				if sigscnt < 0 || sigscnt > keyscnt {
					fmt.Println("OP_CHECKMULTISIG: sigscnt error")
					return false
				}
				i++
				isig := i
				i += int(sigscnt)
				if stack.size() < i {
					if DBG_ERR {
						fmt.Println("OP_CHECKMULTISIG: Stack too short C")
					}
					return false
				}

				xxx := p[sta:]
				for k := 0; k < int(sigscnt); k++ {
					xxx = delSig(xxx, stack.top(-isig-k))
				}

				success := true
				for sigscnt > 0 {
					pk := stack.top(-ikey)
					si := stack.top(-isig)

					// BIP-0066
					if !CheckSignatureEncoding(si, ver_flags) {
						if DBG_ERR {
							fmt.Println("Invalid Signature Encoding B")
						}
						return false
					}

					if len(si) > 0 {
						sh := tx.SignatureHash(xxx, inp, int32(si[len(si)-1]))
						if btc.EcdsaVerify(pk, si, sh) {
							isig++
							sigscnt--
						}
					}

					ikey++
					keyscnt--

					// If there are more signatures left than keys left,
					// then too many signatures have failed
					if sigscnt > keyscnt {
						success = false
						break
					}
				}
				for i > 0 {
					i--
					stack.pop()
				}
				if opcode == 0xaf {
					if !success { // OP_CHECKMULTISIGVERIFY
						return false
					}
				} else {
					stack.pushBool(success)
				}

			case opcode >= 0xb1: //OP_NOP2 or OP_CHECKLOCKTIMEVERIFY
				if DBG_SCR {
					println("OP_NOP2...")
				}

				if (ver_flags & VER_CLTV) == 0 {
					break // Just do NOP2
				}

				if DBG_SCR {
					println("OP_CHECKLOCKTIMEVERIFY...")
				}

				if stack.size() < 1 {
					if DBG_ERR {
						fmt.Println("OP_CHECKLOCKTIMEVERIFY: Stack too short")
					}
					return false
				}

				d := stack.top(-1)
				if len(d) > 5 {
					if DBG_ERR {
						fmt.Println("OP_CHECKLOCKTIMEVERIFY: locktime field too long", len(d))
					}
					return false
				}

				if DBG_SCR {
					fmt.Println("val from stack", hex.EncodeToString(d))
				}

				locktime := bts2int_ext(d, 5, checkMinVals)
				if locktime < 0 {
					if DBG_ERR {
						fmt.Println("OP_CHECKLOCKTIMEVERIFY: negative locktime")
					}
					return false
				}

				if !((tx.Lock_time < LOCKTIME_THRESHOLD && locktime < LOCKTIME_THRESHOLD) ||
					(tx.Lock_time >= LOCKTIME_THRESHOLD && locktime >= LOCKTIME_THRESHOLD)) {
					if DBG_ERR {
						fmt.Println("OP_CHECKLOCKTIMEVERIFY: broken lock value")
					}
					return false
				}

				if DBG_SCR {
					println("locktime > int64(tx.Lock_time)", locktime, int64(tx.Lock_time))
					println(" ... seq", len(tx.TxIn), inp, tx.TxIn[inp].Sequence)
				}

				// Actually compare the specified lock time with the transaction.
				if locktime > int64(tx.Lock_time) {
					if DBG_ERR {
						fmt.Println("OP_CHECKLOCKTIMEVERIFY: Locktime requirement not satisfied")
					}
					return false
				}

				if tx.TxIn[inp].Sequence == 0xffffffff {
					if DBG_ERR {
						fmt.Println("OP_CHECKLOCKTIMEVERIFY: TxIn final")
					}
					return false
				}

				// OP_CHECKLOCKTIMEVERIFY passed successfully

			case opcode >= 0xb0 || opcode >= 0xb2 && opcode <= 0xb9: //OP_NOP1 || OP_NOP3..OP_NOP10
				// just do nothing

			default:
				if DBG_ERR {
					fmt.Printf("Unhandled opcode 0x%02x - a handler must be implemented\n", opcode)
					stack.print()
					fmt.Println("Rest of the script:", hex.EncodeToString(p[idx:]))
				}
				return false
			}
		}

		if DBG_SCR {
			fmt.Printf("Finished Executing opcode 0x%02x\n", opcode)
			stack.print()
		}
		if stack.size()+altstack.size() > 1000 {
			if DBG_ERR {
				fmt.Println("Stack too big")
			}
			return false
		}
	}

	if DBG_SCR {
		fmt.Println("END OF SCRIPT")
		stack.print()
	}

	if exestack.size() > 0 {
		if DBG_ERR {
			fmt.Println("Unfinished if..")
		}
		return false
	}

	return true
}
Ejemplo n.º 26
0
// Calculate a unique 200-bits long hash of the address
func (a *StealthAddr) Hash160() []byte {
	rim := ripemd160.New()
	rim.Write(a.BytesNoPrefix())
	return rim.Sum(nil)
}
Ejemplo n.º 27
0
// calculate hash160 which is ripemd160(sha256(data))
func CalcHash160(buf []byte) []byte {
	return CalcHash(CalcHash(buf, sha256.New()), ripemd160.New())
}
Ejemplo n.º 28
0
// Hash160 calculates the hash ripemd160(sha256(b)).
func Hash160(buf []byte) []byte {
	return calcHash(calcHash(buf, fastsha256.New()), ripemd160.New())
}
Ejemplo n.º 29
0
func main() {
	h := ripemd160.New()
	h.Write([]byte("Rosetta Code"))
	fmt.Printf("%x\n", h.Sum(nil))
}
Ejemplo n.º 30
0
func publicKeyHash(key []byte) []byte {
	s256 := sha256.Sum256(key)
	ripemd160Hash := ripemd160.New()
	ripemd160Hash.Write(s256[:])
	return ripemd160Hash.Sum(nil)
}