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vm contracts spec implements updated #2252

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merged 1 commit into from
Jan 29, 2025
Merged

vm contracts spec implements updated #2252

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102 changes: 12 additions & 90 deletions core/vm/contracts.go
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Original file line number Diff line number Diff line change
Expand Up @@ -131,14 +131,12 @@ var PrecompiledContractsPrague = map[common.Address]PrecompiledContract{
common.BytesToAddress([]byte{0x09}): &blake2F{},
common.BytesToAddress([]byte{0x0a}): &kzgPointEvaluation{},
common.BytesToAddress([]byte{0x0b}): &bls12381G1Add{},
common.BytesToAddress([]byte{0x0c}): &bls12381G1Mul{},
common.BytesToAddress([]byte{0x0d}): &bls12381G1MultiExp{},
common.BytesToAddress([]byte{0x0e}): &bls12381G2Add{},
common.BytesToAddress([]byte{0x0f}): &bls12381G2Mul{},
common.BytesToAddress([]byte{0x10}): &bls12381G2MultiExp{},
common.BytesToAddress([]byte{0x11}): &bls12381Pairing{},
common.BytesToAddress([]byte{0x12}): &bls12381MapG1{},
common.BytesToAddress([]byte{0x13}): &bls12381MapG2{},
common.BytesToAddress([]byte{0x0c}): &bls12381G1MultiExp{},
common.BytesToAddress([]byte{0x0d}): &bls12381G2Add{},
common.BytesToAddress([]byte{0x0e}): &bls12381G2MultiExp{},
common.BytesToAddress([]byte{0x0f}): &bls12381Pairing{},
common.BytesToAddress([]byte{0x10}): &bls12381MapG1{},
common.BytesToAddress([]byte{0x11}): &bls12381MapG2{},
}

var PrecompiledContractsBLS = PrecompiledContractsPrague
Expand Down Expand Up @@ -719,44 +717,6 @@ func (c *bls12381G1Add) Run(input []byte) ([]byte, error) {
return encodePointG1(p0), nil
}

// bls12381G1Mul implements EIP-2537 G1Mul precompile.
type bls12381G1Mul struct{}

// RequiredGas returns the gas required to execute the pre-compiled contract.
func (c *bls12381G1Mul) RequiredGas(input []byte) uint64 {
return params.Bls12381G1MulGas
}

func (c *bls12381G1Mul) Run(input []byte) ([]byte, error) {
// Implements EIP-2537 G1Mul precompile.
// > G1 multiplication call expects `160` bytes as an input that is interpreted as byte concatenation of encoding of G1 point (`128` bytes) and encoding of a scalar value (`32` bytes).
// > Output is an encoding of multiplication operation result - single G1 point (`128` bytes).
if len(input) != 160 {
return nil, errBLS12381InvalidInputLength
}
var err error
var p0 *bls12381.G1Affine

// Decode G1 point
if p0, err = decodePointG1(input[:128]); err != nil {
return nil, err
}
// 'point is on curve' check already done,
// Here we need to apply subgroup checks.
if !p0.IsInSubGroup() {
return nil, errBLS12381G1PointSubgroup
}
// Decode scalar value
e := new(big.Int).SetBytes(input[128:])

// Compute r = e * p_0
r := new(bls12381.G1Affine)
r.ScalarMultiplication(p0, e)

// Encode the G1 point into 128 bytes
return encodePointG1(r), nil
}

// bls12381G1MultiExp implements EIP-2537 G1MultiExp precompile.
type bls12381G1MultiExp struct{}

Expand All @@ -770,10 +730,10 @@ func (c *bls12381G1MultiExp) RequiredGas(input []byte) uint64 {
}
// Lookup discount value for G1 point, scalar value pair length
var discount uint64
if dLen := len(params.Bls12381MultiExpDiscountTable); k < dLen {
discount = params.Bls12381MultiExpDiscountTable[k-1]
if dLen := len(params.Bls12381G1MultiExpDiscountTable); k < dLen {
discount = params.Bls12381G1MultiExpDiscountTable[k-1]
} else {
discount = params.Bls12381MultiExpDiscountTable[dLen-1]
discount = params.Bls12381G1MultiExpDiscountTable[dLen-1]
}
// Calculate gas and return the result
return (uint64(k) * params.Bls12381G1MulGas * discount) / 1000
Expand Down Expand Up @@ -854,44 +814,6 @@ func (c *bls12381G2Add) Run(input []byte) ([]byte, error) {
return encodePointG2(r), nil
}

// bls12381G2Mul implements EIP-2537 G2Mul precompile.
type bls12381G2Mul struct{}

// RequiredGas returns the gas required to execute the pre-compiled contract.
func (c *bls12381G2Mul) RequiredGas(input []byte) uint64 {
return params.Bls12381G2MulGas
}

func (c *bls12381G2Mul) Run(input []byte) ([]byte, error) {
// Implements EIP-2537 G2MUL precompile logic.
// > G2 multiplication call expects `288` bytes as an input that is interpreted as byte concatenation of encoding of G2 point (`256` bytes) and encoding of a scalar value (`32` bytes).
// > Output is an encoding of multiplication operation result - single G2 point (`256` bytes).
if len(input) != 288 {
return nil, errBLS12381InvalidInputLength
}
var err error
var p0 *bls12381.G2Affine

// Decode G2 point
if p0, err = decodePointG2(input[:256]); err != nil {
return nil, err
}
// 'point is on curve' check already done,
// Here we need to apply subgroup checks.
if !p0.IsInSubGroup() {
return nil, errBLS12381G2PointSubgroup
}
// Decode scalar value
e := new(big.Int).SetBytes(input[256:])

// Compute r = e * p_0
r := new(bls12381.G2Affine)
r.ScalarMultiplication(p0, e)

// Encode the G2 point into 256 bytes
return encodePointG2(r), nil
}

// bls12381G2MultiExp implements EIP-2537 G2MultiExp precompile.
type bls12381G2MultiExp struct{}

Expand All @@ -905,10 +827,10 @@ func (c *bls12381G2MultiExp) RequiredGas(input []byte) uint64 {
}
// Lookup discount value for G2 point, scalar value pair length
var discount uint64
if dLen := len(params.Bls12381MultiExpDiscountTable); k < dLen {
discount = params.Bls12381MultiExpDiscountTable[k-1]
if dLen := len(params.Bls12381G2MultiExpDiscountTable); k < dLen {
discount = params.Bls12381G2MultiExpDiscountTable[k-1]
} else {
discount = params.Bls12381MultiExpDiscountTable[dLen-1]
discount = params.Bls12381G2MultiExpDiscountTable[dLen-1]
}
// Calculate gas and return the result
return (uint64(k) * params.Bls12381G2MulGas * discount) / 1000
Expand Down
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