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lbcd/txscript/scriptnum_test.go
David Hill ce22159fb2 txscript: Change makeScriptNum to take a length argument 
While current existing numeric opcodes are limited to 4 bytes, new
opcodes may need different limits.

This mimics Bitcoin Core commit 99088d60d8a7747c6d1a7fd5d8cd388be1b3e138
2015-10-05 19:48:55 -04:00

268 lines
10 KiB
Go
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// Copyright (c) 2015 The btcsuite developers
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.
package txscript
import (
"bytes"
"encoding/hex"
"testing"
)
// hexToBytes converts the passed hex string into bytes and will panic if there
// is an error. This is only provided for the hard-coded constants so errors in
// the source code can be detected. It will only (and must only) be called with
// hard-coded values.
func hexToBytes(s string) []byte {
b, err := hex.DecodeString(s)
if err != nil {
panic("invalid hex in source file: " + s)
}
return b
}
// TestScriptNumBytes ensures that converting from integral script numbers to
// byte representations works as expected.
func TestScriptNumBytes(t *testing.T) {
t.Parallel()
tests := []struct {
num scriptNum
serialized []byte
}{
{0, nil},
{1, hexToBytes("01")},
{-1, hexToBytes("81")},
{127, hexToBytes("7f")},
{-127, hexToBytes("ff")},
{128, hexToBytes("8000")},
{-128, hexToBytes("8080")},
{129, hexToBytes("8100")},
{-129, hexToBytes("8180")},
{256, hexToBytes("0001")},
{-256, hexToBytes("0081")},
{32767, hexToBytes("ff7f")},
{-32767, hexToBytes("ffff")},
{32768, hexToBytes("008000")},
{-32768, hexToBytes("008080")},
{65535, hexToBytes("ffff00")},
{-65535, hexToBytes("ffff80")},
{524288, hexToBytes("000008")},
{-524288, hexToBytes("000088")},
{7340032, hexToBytes("000070")},
{-7340032, hexToBytes("0000f0")},
{8388608, hexToBytes("00008000")},
{-8388608, hexToBytes("00008080")},
{2147483647, hexToBytes("ffffff7f")},
{-2147483647, hexToBytes("ffffffff")},
// Values that are out of range for data that is interpreted as
// numbers, but are allowed as the result of numeric operations.
{2147483648, hexToBytes("0000008000")},
{-2147483648, hexToBytes("0000008080")},
{2415919104, hexToBytes("0000009000")},
{-2415919104, hexToBytes("0000009080")},
{4294967295, hexToBytes("ffffffff00")},
{-4294967295, hexToBytes("ffffffff80")},
{4294967296, hexToBytes("0000000001")},
{-4294967296, hexToBytes("0000000081")},
{281474976710655, hexToBytes("ffffffffffff00")},
{-281474976710655, hexToBytes("ffffffffffff80")},
{72057594037927935, hexToBytes("ffffffffffffff00")},
{-72057594037927935, hexToBytes("ffffffffffffff80")},
{9223372036854775807, hexToBytes("ffffffffffffff7f")},
{-9223372036854775807, hexToBytes("ffffffffffffffff")},
}
for _, test := range tests {
gotBytes := test.num.Bytes()
if !bytes.Equal(gotBytes, test.serialized) {
t.Errorf("Bytes: did not get expected bytes for %d - "+
"got %x, want %x", test.num, gotBytes,
test.serialized)
continue
}
}
}
// TestMakeScriptNum ensures that converting from byte representations to
// integral script numbers works as expected.
func TestMakeScriptNum(t *testing.T) {
t.Parallel()
tests := []struct {
serialized []byte
num scriptNum
numLen int
minimalEncoding bool
err error
}{
// Minimal encoding must reject negative 0.
{hexToBytes("80"), 0, defaultScriptNumLen, true, ErrStackMinimalData},
// Minimally encoded valid values with minimal encoding flag.
// Should not error and return expected integral number.
{nil, 0, defaultScriptNumLen, true, nil},
{hexToBytes("01"), 1, defaultScriptNumLen, true, nil},
{hexToBytes("81"), -1, defaultScriptNumLen, true, nil},
{hexToBytes("7f"), 127, defaultScriptNumLen, true, nil},
{hexToBytes("ff"), -127, defaultScriptNumLen, true, nil},
{hexToBytes("8000"), 128, defaultScriptNumLen, true, nil},
{hexToBytes("8080"), -128, defaultScriptNumLen, true, nil},
{hexToBytes("8100"), 129, defaultScriptNumLen, true, nil},
{hexToBytes("8180"), -129, defaultScriptNumLen, true, nil},
{hexToBytes("0001"), 256, defaultScriptNumLen, true, nil},
{hexToBytes("0081"), -256, defaultScriptNumLen, true, nil},
{hexToBytes("ff7f"), 32767, defaultScriptNumLen, true, nil},
{hexToBytes("ffff"), -32767, defaultScriptNumLen, true, nil},
{hexToBytes("008000"), 32768, defaultScriptNumLen, true, nil},
{hexToBytes("008080"), -32768, defaultScriptNumLen, true, nil},
{hexToBytes("ffff00"), 65535, defaultScriptNumLen, true, nil},
{hexToBytes("ffff80"), -65535, defaultScriptNumLen, true, nil},
{hexToBytes("000008"), 524288, defaultScriptNumLen, true, nil},
{hexToBytes("000088"), -524288, defaultScriptNumLen, true, nil},
{hexToBytes("000070"), 7340032, defaultScriptNumLen, true, nil},
{hexToBytes("0000f0"), -7340032, defaultScriptNumLen, true, nil},
{hexToBytes("00008000"), 8388608, defaultScriptNumLen, true, nil},
{hexToBytes("00008080"), -8388608, defaultScriptNumLen, true, nil},
{hexToBytes("ffffff7f"), 2147483647, defaultScriptNumLen, true, nil},
{hexToBytes("ffffffff"), -2147483647, defaultScriptNumLen, true, nil},
{hexToBytes("ffffffff7f"), 549755813887, 5, true, nil},
{hexToBytes("ffffffffff"), -549755813887, 5, true, nil},
{hexToBytes("ffffffffffffff7f"), 9223372036854775807, 8, true, nil},
{hexToBytes("ffffffffffffffff"), -9223372036854775807, 8, true, nil},
{hexToBytes("ffffffffffffffff7f"), -1, 9, true, nil},
{hexToBytes("ffffffffffffffffff"), 1, 9, true, nil},
{hexToBytes("ffffffffffffffffff7f"), -1, 10, true, nil},
{hexToBytes("ffffffffffffffffffff"), 1, 10, true, nil},
// Minimally encoded values that are out of range for data that
// is interpreted as script numbers with the minimal encoding
// flag set. Should error and return 0.
{hexToBytes("0000008000"), 0, defaultScriptNumLen, true, ErrStackNumberTooBig},
{hexToBytes("0000008080"), 0, defaultScriptNumLen, true, ErrStackNumberTooBig},
{hexToBytes("0000009000"), 0, defaultScriptNumLen, true, ErrStackNumberTooBig},
{hexToBytes("0000009080"), 0, defaultScriptNumLen, true, ErrStackNumberTooBig},
{hexToBytes("ffffffff00"), 0, defaultScriptNumLen, true, ErrStackNumberTooBig},
{hexToBytes("ffffffff80"), 0, defaultScriptNumLen, true, ErrStackNumberTooBig},
{hexToBytes("0000000001"), 0, defaultScriptNumLen, true, ErrStackNumberTooBig},
{hexToBytes("0000000081"), 0, defaultScriptNumLen, true, ErrStackNumberTooBig},
{hexToBytes("ffffffffffff00"), 0, defaultScriptNumLen, true, ErrStackNumberTooBig},
{hexToBytes("ffffffffffff80"), 0, defaultScriptNumLen, true, ErrStackNumberTooBig},
{hexToBytes("ffffffffffffff00"), 0, defaultScriptNumLen, true, ErrStackNumberTooBig},
{hexToBytes("ffffffffffffff80"), 0, defaultScriptNumLen, true, ErrStackNumberTooBig},
{hexToBytes("ffffffffffffff7f"), 0, defaultScriptNumLen, true, ErrStackNumberTooBig},
{hexToBytes("ffffffffffffffff"), 0, defaultScriptNumLen, true, ErrStackNumberTooBig},
// Non-minimally encoded, but otherwise valid values with
// minimal encoding flag. Should error and return 0.
{hexToBytes("00"), 0, defaultScriptNumLen, true, ErrStackMinimalData}, // 0
{hexToBytes("0100"), 0, defaultScriptNumLen, true, ErrStackMinimalData}, // 1
{hexToBytes("7f00"), 0, defaultScriptNumLen, true, ErrStackMinimalData}, // 127
{hexToBytes("800000"), 0, defaultScriptNumLen, true, ErrStackMinimalData}, // 128
{hexToBytes("810000"), 0, defaultScriptNumLen, true, ErrStackMinimalData}, // 129
{hexToBytes("000100"), 0, defaultScriptNumLen, true, ErrStackMinimalData}, // 256
{hexToBytes("ff7f00"), 0, defaultScriptNumLen, true, ErrStackMinimalData}, // 32767
{hexToBytes("00800000"), 0, defaultScriptNumLen, true, ErrStackMinimalData}, // 32768
{hexToBytes("ffff0000"), 0, defaultScriptNumLen, true, ErrStackMinimalData}, // 65535
{hexToBytes("00000800"), 0, defaultScriptNumLen, true, ErrStackMinimalData}, // 524288
{hexToBytes("00007000"), 0, defaultScriptNumLen, true, ErrStackMinimalData}, // 7340032
{hexToBytes("0009000100"), 0, 5, true, ErrStackMinimalData}, // 16779520
// Non-minimally encoded, but otherwise valid values without
// minimal encoding flag. Should not error and return expected
// integral number.
{hexToBytes("00"), 0, defaultScriptNumLen, false, nil},
{hexToBytes("0100"), 1, defaultScriptNumLen, false, nil},
{hexToBytes("7f00"), 127, defaultScriptNumLen, false, nil},
{hexToBytes("800000"), 128, defaultScriptNumLen, false, nil},
{hexToBytes("810000"), 129, defaultScriptNumLen, false, nil},
{hexToBytes("000100"), 256, defaultScriptNumLen, false, nil},
{hexToBytes("ff7f00"), 32767, defaultScriptNumLen, false, nil},
{hexToBytes("00800000"), 32768, defaultScriptNumLen, false, nil},
{hexToBytes("ffff0000"), 65535, defaultScriptNumLen, false, nil},
{hexToBytes("00000800"), 524288, defaultScriptNumLen, false, nil},
{hexToBytes("00007000"), 7340032, defaultScriptNumLen, false, nil},
{hexToBytes("0009000100"), 16779520, 5, false, nil},
}
for _, test := range tests {
gotNum, err := makeScriptNum(test.serialized, test.minimalEncoding,
test.numLen)
if err != test.err {
t.Errorf("makeScriptNum: did not received expected "+
"error for %x - got %v, want %v",
test.serialized, err, test.err)
continue
}
if gotNum != test.num {
t.Errorf("makeScriptNum: did not get expected number "+
"for %x - got %d, want %d", test.serialized,
gotNum, test.num)
continue
}
}
}
// TestScriptNumInt32 ensures that the Int32 function on script number behaves
// as expected.
func TestScriptNumInt32(t *testing.T) {
t.Parallel()
tests := []struct {
in scriptNum
want int32
}{
// Values inside the valid int32 range are just the values
// themselves cast to an int32.
{0, 0},
{1, 1},
{-1, -1},
{127, 127},
{-127, -127},
{128, 128},
{-128, -128},
{129, 129},
{-129, -129},
{256, 256},
{-256, -256},
{32767, 32767},
{-32767, -32767},
{32768, 32768},
{-32768, -32768},
{65535, 65535},
{-65535, -65535},
{524288, 524288},
{-524288, -524288},
{7340032, 7340032},
{-7340032, -7340032},
{8388608, 8388608},
{-8388608, -8388608},
{2147483647, 2147483647},
{-2147483647, -2147483647},
{-2147483648, -2147483648},
// Values outside of the valid int32 range are limited to int32.
{2147483648, 2147483647},
{-2147483649, -2147483648},
{1152921504606846975, 2147483647},
{-1152921504606846975, -2147483648},
{2305843009213693951, 2147483647},
{-2305843009213693951, -2147483648},
{4611686018427387903, 2147483647},
{-4611686018427387903, -2147483648},
{9223372036854775807, 2147483647},
{-9223372036854775808, -2147483648},
}
for _, test := range tests {
got := test.in.Int32()
if got != test.want {
t.Errorf("Int32: did not get expected value for %d - "+
"got %d, want %d", test.in, got, test.want)
continue
}
}
}
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