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use abstraction from modexp package

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This commit is contained in:
Kevaundray Wedderburn 2025-07-11 00:08:33 +01:00
parent e131482fe2
commit 9f789b6272
1 changed files with 10 additions and 13 deletions
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23
core/vm/contracts.go
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@ -35,6 +35,7 @@ import (
"github.com/ethereum/go-ethereum/crypto/blake2b"
"github.com/ethereum/go-ethereum/crypto/bn256"
"github.com/ethereum/go-ethereum/crypto/kzg4844"
"github.com/ethereum/go-ethereum/crypto/modexp"
"github.com/ethereum/go-ethereum/crypto/secp256r1"
"github.com/ethereum/go-ethereum/params"
"github.com/holiman/uint256"
@ -623,21 +624,17 @@ 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))
v []byte
base = getData(input, 0, baseLen)
exp = getData(input, baseLen, expLen)
mod = getData(input, baseLen+expLen, modLen)
)
switch {
case mod.BitLen() == 0:
// Modulo 0 is undefined, return zero
return common.LeftPadBytes([]byte{}, int(modLen)), nil
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()
// Use the modexp implementation
v, err := modexp.ModExp(base, exp, mod)
if err != nil {
return nil, err
}
return common.LeftPadBytes(v, int(modLen)), nil
}