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authorThomas Bocek <tom@tomp2p.net>2016-06-03 00:43:27 +0800
committerThomas Bocek <tom@tomp2p.net>2016-06-06 20:27:15 +0800
commit89c6c5bb85ff24c152218f245fa366e733c951a7 (patch)
treeed0d02d136ed0f2aa06eb617a9feec661005ddfd /accounts
parent16a23ff74056aa306eb8a87272277bc8660f3252 (diff)
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accounts/abi: Negative numbers not properly converted in ABI encoding
When converting a negative number e.g., -2, the resulting ABI encoding should look as follows: fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe. However, since the check of the type is for an uint instead of an int, it results in the following ABI encoding: 0101010101010101010101010101010101010101010101010101010101010102. The Ethereum ABI (https://github.com/ethereum/wiki/wiki/Ethereum-Contract-ABI) says, that signed integers are stored in two's complement which should be of the form ffffff.... and not 01010101..... for e.g. -1. Thus, I removed the type check in numbers.go as well as the function S256 as I don't think they are correct. Or maybe I'm missing something?
Diffstat (limited to 'accounts')
-rw-r--r--accounts/abi/method.go2
-rw-r--r--accounts/abi/numbers.go42
-rw-r--r--accounts/abi/numbers_test.go26
-rw-r--r--accounts/abi/packing.go4
4 files changed, 10 insertions, 64 deletions
diff --git a/accounts/abi/method.go b/accounts/abi/method.go
index f3d1a44b5..d56f3bc3d 100644
--- a/accounts/abi/method.go
+++ b/accounts/abi/method.go
@@ -62,7 +62,7 @@ func (m Method) pack(method Method, args ...interface{}) ([]byte, error) {
// calculate the offset
offset := len(method.Inputs)*32 + len(variableInput)
// set the offset
- ret = append(ret, packNum(reflect.ValueOf(offset), UintTy)...)
+ ret = append(ret, packNum(reflect.ValueOf(offset))...)
// Append the packed output to the variable input. The variable input
// will be appended at the end of the input.
variableInput = append(variableInput, packed...)
diff --git a/accounts/abi/numbers.go b/accounts/abi/numbers.go
index 5a31cf2b5..06c4422f9 100644
--- a/accounts/abi/numbers.go
+++ b/accounts/abi/numbers.go
@@ -61,54 +61,20 @@ func U256(n *big.Int) []byte {
return common.LeftPadBytes(common.U256(n).Bytes(), 32)
}
-func S256(n *big.Int) []byte {
- sint := common.S256(n)
- ret := common.LeftPadBytes(sint.Bytes(), 32)
- if sint.Cmp(common.Big0) < 0 {
- for i, b := range ret {
- if b == 0 {
- ret[i] = 1
- continue
- }
- break
- }
- }
-
- return ret
-}
-
// S256 will ensure signed 256bit on big nums
func U2U256(n uint64) []byte {
return U256(big.NewInt(int64(n)))
}
-func S2S256(n int64) []byte {
- return S256(big.NewInt(n))
-}
-
// packNum packs the given number (using the reflect value) and will cast it to appropriate number representation
-func packNum(value reflect.Value, to byte) []byte {
+func packNum(value reflect.Value) []byte {
switch kind := value.Kind(); kind {
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
- if to == UintTy {
- return U2U256(value.Uint())
- } else {
- return S2S256(int64(value.Uint()))
- }
+ return U2U256(value.Uint())
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
- if to == UintTy {
- return U2U256(uint64(value.Int()))
- } else {
- return S2S256(value.Int())
- }
+ return U2U256(uint64(value.Int()))
case reflect.Ptr:
- // This only takes care of packing and casting. No type checking is done here. It should be done prior to using this function.
- if to == UintTy {
- return U256(value.Interface().(*big.Int))
- } else {
- return S256(value.Interface().(*big.Int))
- }
-
+ return U256(value.Interface().(*big.Int))
}
return nil
diff --git a/accounts/abi/numbers_test.go b/accounts/abi/numbers_test.go
index d66a43258..f409aa60f 100644
--- a/accounts/abi/numbers_test.go
+++ b/accounts/abi/numbers_test.go
@@ -26,48 +26,28 @@ import (
func TestNumberTypes(t *testing.T) {
ubytes := make([]byte, 32)
ubytes[31] = 1
- sbytesmin := []byte{1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}
unsigned := U256(big.NewInt(1))
if !bytes.Equal(unsigned, ubytes) {
t.Errorf("expected %x got %x", ubytes, unsigned)
}
-
- signed := S256(big.NewInt(1))
- if !bytes.Equal(signed, ubytes) {
- t.Errorf("expected %x got %x", ubytes, unsigned)
- }
-
- signed = S256(big.NewInt(-1))
- if !bytes.Equal(signed, sbytesmin) {
- t.Errorf("expected %x got %x", ubytes, unsigned)
- }
}
func TestPackNumber(t *testing.T) {
ubytes := make([]byte, 32)
ubytes[31] = 1
- sbytesmin := []byte{1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}
maxunsigned := []byte{255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255}
- packed := packNum(reflect.ValueOf(1), IntTy)
- if !bytes.Equal(packed, ubytes) {
- t.Errorf("expected %x got %x", ubytes, packed)
- }
- packed = packNum(reflect.ValueOf(-1), IntTy)
- if !bytes.Equal(packed, sbytesmin) {
- t.Errorf("expected %x got %x", ubytes, packed)
- }
- packed = packNum(reflect.ValueOf(1), UintTy)
+ packed := packNum(reflect.ValueOf(1))
if !bytes.Equal(packed, ubytes) {
t.Errorf("expected %x got %x", ubytes, packed)
}
- packed = packNum(reflect.ValueOf(-1), UintTy)
+ packed = packNum(reflect.ValueOf(-1))
if !bytes.Equal(packed, maxunsigned) {
t.Errorf("expected %x got %x", maxunsigned, packed)
}
- packed = packNum(reflect.ValueOf("string"), UintTy)
+ packed = packNum(reflect.ValueOf("string"))
if packed != nil {
t.Errorf("expected 'string' to pack to nil. got %x instead", packed)
}
diff --git a/accounts/abi/packing.go b/accounts/abi/packing.go
index c765dfdf3..0c37edf17 100644
--- a/accounts/abi/packing.go
+++ b/accounts/abi/packing.go
@@ -25,7 +25,7 @@ import (
// packBytesSlice packs the given bytes as [L, V] as the canonical representation
// bytes slice
func packBytesSlice(bytes []byte, l int) []byte {
- len := packNum(reflect.ValueOf(l), UintTy)
+ len := packNum(reflect.ValueOf(l))
return append(len, common.RightPadBytes(bytes, (l+31)/32*32)...)
}
@@ -34,7 +34,7 @@ func packBytesSlice(bytes []byte, l int) []byte {
func packElement(t Type, reflectValue reflect.Value) []byte {
switch t.T {
case IntTy, UintTy:
- return packNum(reflectValue, t.T)
+ return packNum(reflectValue)
case StringTy:
return packBytesSlice([]byte(reflectValue.String()), reflectValue.Len())
case AddressTy: