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Fix compat with 32 bit arch

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This commit is contained in:
Eduard S
2020-03-17 17:17:45 +01:00
parent ee467c6215
commit e10db811aa
2 changed files with 41 additions and 6 deletions
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40
ff/element.go
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@@ -513,15 +513,33 @@ func (z *Element) String() string {
// ToBigInt returns z as a big.Int in Montgomery form
func (z *Element) ToBigInt(res *big.Int) *big.Int {
bits := (*[4]big.Word)(unsafe.Pointer(z))
return res.SetBits(bits[:])
if bits.UintSize == 64 {
bits := (*[4]big.Word)(unsafe.Pointer(z))
return res.SetBits(bits[:])
} else {
var bits [8]big.Word
for i := 0; i < len(z); i++ {
bits[i*2] = big.Word(z[i])
bits[i*2+1] = big.Word(z[i] >> 32)
}
return res.SetBits(bits[:])
}
}
// ToBigIntRegular returns z as a big.Int in regular form
func (z Element) ToBigIntRegular(res *big.Int) *big.Int {
z.FromMont()
bits := (*[4]big.Word)(unsafe.Pointer(&z))
return res.SetBits(bits[:])
if bits.UintSize == 64 {
bits := (*[4]big.Word)(unsafe.Pointer(&z))
return res.SetBits(bits[:])
} else {
var bits [8]big.Word
for i := 0; i < len(z); i++ {
bits[i*2] = big.Word(z[i])
bits[i*2+1] = big.Word(z[i] >> 32)
}
return res.SetBits(bits[:])
}
}
// SetBigInt sets z to v (regular form) and returns z in Montgomery form
@@ -548,8 +566,18 @@ func (z *Element) SetBigInt(v *big.Int) *Element {
}
// v should
vBits := vv.Bits()
for i := 0; i < len(vBits); i++ {
z[i] = uint64(vBits[i])
if bits.UintSize == 64 {
for i := 0; i < len(vBits); i++ {
z[i] = uint64(vBits[i])
}
} else {
for i := 0; i < len(vBits); i++ {
if i%2 == 0 {
z[i/2] = uint64(vBits[i])
} else {
z[i/2] |= uint64(vBits[i]) << 32
}
}
}
return z.ToMont()
}