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core/vm: use optimized bigint (#26021)

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This commit is contained in:
Daniel Liu 2024-09-26 13:52:56 +08:00
parent abebda601c
commit 8e15f825ce
1 changed files with 6 additions and 5 deletions
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11
core/vm/contracts.go
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@ -29,6 +29,7 @@ import (
"github.com/XinFinOrg/XDPoSChain/crypto/blake2b"
"github.com/XinFinOrg/XDPoSChain/crypto/bn256"
"github.com/XinFinOrg/XDPoSChain/params"
big2 "github.com/holiman/big"
//lint:ignore SA1019 Needed for precompile
"golang.org/x/crypto/ripemd160"
@ -401,17 +402,17 @@ func (c *bigModExp) Run(input []byte) ([]byte, error) {
}
// Retrieve the operands and execute the exponentiation
var (
base = new(big.Int).SetBytes(getData(input, 0, baseLen))
exp = new(big.Int).SetBytes(getData(input, baseLen, expLen))
mod = new(big.Int).SetBytes(getData(input, baseLen+expLen, modLen))
base = new(big2.Int).SetBytes(getData(input, 0, baseLen))
exp = new(big2.Int).SetBytes(getData(input, baseLen, expLen))
mod = new(big2.Int).SetBytes(getData(input, baseLen+expLen, modLen))
v []byte
)
switch {
case mod.BitLen() == 0:
// Modulo 0 is undefined, return zero
return common.LeftPadBytes([]byte{}, int(modLen)), nil
case base.Cmp(common.Big1) == 0:
//If base == 1, then we can just return base % mod (if mod >= 1, which it is)
case base.BitLen() == 1: // a bit length of 1 means it's 1 (or -1).
// If base == 1, then we can just return base % mod (if mod >= 1, which it is)
v = base.Mod(base, mod).Bytes()
default:
v = base.Exp(base, exp, mod).Bytes()