mirror of
https://github.com/nspcc-dev/neo-go.git
synced 2024-10-16 15:43:25 +00:00
450 lines
14 KiB
Go
450 lines
14 KiB
Go
package native
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import (
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"crypto/elliptic"
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"encoding/binary"
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"errors"
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"fmt"
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"math/big"
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bls12381 "github.com/consensys/gnark-crypto/ecc/bls12-381"
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"github.com/consensys/gnark-crypto/ecc/bls12-381/fr"
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"github.com/decred/dcrd/dcrec/secp256k1/v4"
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"github.com/nspcc-dev/neo-go/pkg/core/dao"
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"github.com/nspcc-dev/neo-go/pkg/core/interop"
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"github.com/nspcc-dev/neo-go/pkg/core/native/nativenames"
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"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
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"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract/callflag"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract/manifest"
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"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
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"github.com/twmb/murmur3"
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)
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// Crypto represents CryptoLib contract.
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type Crypto struct {
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interop.ContractMD
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}
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// NamedCurve identifies named elliptic curves.
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type NamedCurve byte
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// Various named elliptic curves.
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const (
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Secp256k1 NamedCurve = 22
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Secp256r1 NamedCurve = 23
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)
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const cryptoContractID = -3
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func newCrypto() *Crypto {
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c := &Crypto{ContractMD: *interop.NewContractMD(nativenames.CryptoLib, cryptoContractID)}
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defer c.UpdateHash()
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desc := newDescriptor("sha256", smartcontract.ByteArrayType,
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manifest.NewParameter("data", smartcontract.ByteArrayType))
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md := newMethodAndPrice(c.sha256, 1<<15, callflag.NoneFlag)
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c.AddMethod(md, desc)
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desc = newDescriptor("ripemd160", smartcontract.ByteArrayType,
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manifest.NewParameter("data", smartcontract.ByteArrayType))
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md = newMethodAndPrice(c.ripemd160, 1<<15, callflag.NoneFlag)
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c.AddMethod(md, desc)
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desc = newDescriptor("murmur32", smartcontract.ByteArrayType,
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manifest.NewParameter("data", smartcontract.ByteArrayType),
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manifest.NewParameter("seed", smartcontract.IntegerType))
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md = newMethodAndPrice(c.murmur32, 1<<13, callflag.NoneFlag)
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c.AddMethod(md, desc)
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desc = newDescriptor("verifyWithECDsa", smartcontract.BoolType,
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manifest.NewParameter("message", smartcontract.ByteArrayType),
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manifest.NewParameter("pubkey", smartcontract.ByteArrayType),
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manifest.NewParameter("signature", smartcontract.ByteArrayType),
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manifest.NewParameter("curve", smartcontract.IntegerType))
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md = newMethodAndPrice(c.verifyWithECDsa, 1<<15, callflag.NoneFlag)
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c.AddMethod(md, desc)
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desc = newDescriptor("bls12381Serialize", smartcontract.ByteArrayType,
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manifest.NewParameter("g", smartcontract.InteropInterfaceType))
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md = newMethodAndPrice(c.bls12381Serialize, 1<<19, callflag.NoneFlag)
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c.AddMethod(md, desc)
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desc = newDescriptor("bls12381Deserialize", smartcontract.InteropInterfaceType,
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manifest.NewParameter("data", smartcontract.ByteArrayType))
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md = newMethodAndPrice(c.bls12381Deserialize, 1<<19, callflag.NoneFlag)
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c.AddMethod(md, desc)
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desc = newDescriptor("bls12381Equal", smartcontract.BoolType,
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manifest.NewParameter("x", smartcontract.InteropInterfaceType),
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manifest.NewParameter("y", smartcontract.InteropInterfaceType))
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md = newMethodAndPrice(c.bls12381Equal, 1<<5, callflag.NoneFlag)
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c.AddMethod(md, desc)
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desc = newDescriptor("bls12381Add", smartcontract.InteropInterfaceType,
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manifest.NewParameter("x", smartcontract.InteropInterfaceType),
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manifest.NewParameter("y", smartcontract.InteropInterfaceType))
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md = newMethodAndPrice(c.bls12381Add, 1<<19, callflag.NoneFlag)
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c.AddMethod(md, desc)
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desc = newDescriptor("bls12381Mul", smartcontract.InteropInterfaceType,
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manifest.NewParameter("x", smartcontract.InteropInterfaceType),
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manifest.NewParameter("mul", smartcontract.ByteArrayType),
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manifest.NewParameter("neg", smartcontract.BoolType))
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md = newMethodAndPrice(c.bls12381Mul, 1<<21, callflag.NoneFlag)
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c.AddMethod(md, desc)
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desc = newDescriptor("bls12381Pairing", smartcontract.InteropInterfaceType,
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manifest.NewParameter("g1", smartcontract.InteropInterfaceType),
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manifest.NewParameter("g2", smartcontract.InteropInterfaceType))
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md = newMethodAndPrice(c.bls12381Pairing, 1<<23, callflag.NoneFlag)
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c.AddMethod(md, desc)
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return c
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}
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func (c *Crypto) sha256(_ *interop.Context, args []stackitem.Item) stackitem.Item {
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bs, err := args[0].TryBytes()
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if err != nil {
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panic(err)
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}
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return stackitem.NewByteArray(hash.Sha256(bs).BytesBE())
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}
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func (c *Crypto) ripemd160(_ *interop.Context, args []stackitem.Item) stackitem.Item {
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bs, err := args[0].TryBytes()
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if err != nil {
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panic(err)
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}
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return stackitem.NewByteArray(hash.RipeMD160(bs).BytesBE())
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}
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func (c *Crypto) murmur32(_ *interop.Context, args []stackitem.Item) stackitem.Item {
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bs, err := args[0].TryBytes()
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if err != nil {
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panic(err)
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}
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seed := toUint32(args[1])
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h := murmur3.SeedSum32(seed, bs)
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result := make([]byte, 4)
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binary.LittleEndian.PutUint32(result, h)
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return stackitem.NewByteArray(result)
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}
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func (c *Crypto) verifyWithECDsa(_ *interop.Context, args []stackitem.Item) stackitem.Item {
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msg, err := args[0].TryBytes()
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if err != nil {
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panic(fmt.Errorf("invalid message stackitem: %w", err))
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}
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hashToCheck := hash.Sha256(msg)
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pubkey, err := args[1].TryBytes()
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if err != nil {
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panic(fmt.Errorf("invalid pubkey stackitem: %w", err))
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}
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signature, err := args[2].TryBytes()
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if err != nil {
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panic(fmt.Errorf("invalid signature stackitem: %w", err))
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}
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curve, err := curveFromStackitem(args[3])
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if err != nil {
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panic(fmt.Errorf("invalid curve stackitem: %w", err))
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}
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pkey, err := keys.NewPublicKeyFromBytes(pubkey, curve)
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if err != nil {
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panic(fmt.Errorf("failed to decode pubkey: %w", err))
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}
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res := pkey.Verify(signature, hashToCheck.BytesBE())
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return stackitem.NewBool(res)
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}
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func curveFromStackitem(si stackitem.Item) (elliptic.Curve, error) {
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curve, err := si.TryInteger()
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if err != nil {
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return nil, err
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}
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if !curve.IsInt64() {
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return nil, errors.New("not an int64")
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}
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c := curve.Int64()
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switch c {
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case int64(Secp256k1):
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return secp256k1.S256(), nil
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case int64(Secp256r1):
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return elliptic.P256(), nil
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default:
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return nil, errors.New("unsupported curve type")
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}
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}
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func (c *Crypto) bls12381Serialize(_ *interop.Context, args []stackitem.Item) stackitem.Item {
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val, ok := args[0].(*stackitem.Interop).Value().(blsPoint)
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if !ok {
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panic(errors.New("not a bls12381 point"))
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}
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return stackitem.NewByteArray(val.Bytes())
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}
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func (c *Crypto) bls12381Deserialize(_ *interop.Context, args []stackitem.Item) stackitem.Item {
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buf, err := args[0].TryBytes()
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if err != nil {
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panic(fmt.Errorf("invalid serialized bls12381 point: %w", err))
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}
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var res interface{}
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switch l := len(buf); l {
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case bls12381.SizeOfG1AffineCompressed:
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g1Affine := new(bls12381.G1Affine)
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_, err = g1Affine.SetBytes(buf)
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if err != nil {
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panic(fmt.Errorf("failed to decode bls12381 G1Affine point: %w", err))
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}
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res = g1Affine
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case bls12381.SizeOfG2AffineCompressed:
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g2Affine := new(bls12381.G2Affine)
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_, err = g2Affine.SetBytes(buf)
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if err != nil {
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panic(fmt.Errorf("failed to decode bls12381 G2Affine point: %w", err))
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}
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res = g2Affine
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case bls12381.SizeOfGT:
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gt := new(bls12381.GT)
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err := gt.SetBytes(buf)
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if err != nil {
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panic(fmt.Errorf("failed to decode GT point: %w", err))
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}
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res = gt
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}
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return stackitem.NewInterop(blsPoint{point: res})
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}
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func (c *Crypto) bls12381Equal(_ *interop.Context, args []stackitem.Item) stackitem.Item {
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a, okA := args[0].(*stackitem.Interop).Value().(blsPoint)
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b, okB := args[1].(*stackitem.Interop).Value().(blsPoint)
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if !(okA && okB) {
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panic("some of the arguments are not a bls12381 point")
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}
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res, err := a.EqualsCheckType(b)
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if err != nil {
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panic(err)
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}
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return stackitem.NewBool(res)
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}
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func (c *Crypto) bls12381Add(_ *interop.Context, args []stackitem.Item) stackitem.Item {
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a, okA := args[0].(*stackitem.Interop).Value().(blsPoint)
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b, okB := args[1].(*stackitem.Interop).Value().(blsPoint)
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if !(okA && okB) {
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panic("some of the arguments are not a bls12381 point")
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}
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var res interface{}
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switch x := a.point.(type) {
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case *bls12381.G1Affine:
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switch y := b.point.(type) {
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case *bls12381.G1Affine:
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xJac := new(bls12381.G1Jac)
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xJac.FromAffine(x)
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xJac.AddMixed(y)
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res = xJac
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case *bls12381.G1Jac:
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yJac := new(bls12381.G1Jac)
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yJac.Set(y)
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yJac.AddMixed(x)
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res = yJac
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default:
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panic(fmt.Errorf("add: inconsistent bls12381 point types: %T and %T", x, y))
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}
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case *bls12381.G1Jac:
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resJac := new(bls12381.G1Jac)
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resJac.Set(x)
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switch y := b.point.(type) {
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case *bls12381.G1Affine:
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resJac.AddMixed(y)
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case *bls12381.G1Jac:
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resJac.AddAssign(y)
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default:
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panic(fmt.Errorf("add: inconsistent bls12381 point types: %T and %T", x, y))
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}
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res = resJac
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case *bls12381.G2Affine:
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switch y := b.point.(type) {
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case *bls12381.G2Affine:
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xJac := new(bls12381.G2Jac)
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xJac.FromAffine(x)
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xJac.AddMixed(y)
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res = xJac
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case *bls12381.G2Jac:
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yJac := new(bls12381.G2Jac)
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yJac.Set(y)
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yJac.AddMixed(x)
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res = yJac
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default:
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panic(fmt.Errorf("add: inconsistent bls12381 point types: %T and %T", x, y))
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}
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case *bls12381.G2Jac:
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resJac := new(bls12381.G2Jac)
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resJac.Set(x)
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switch y := b.point.(type) {
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case *bls12381.G2Affine:
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resJac.AddMixed(y)
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case *bls12381.G2Jac:
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resJac.AddAssign(y)
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default:
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panic(fmt.Errorf("add: inconsistent bls12381 point types: %T and %T", x, y))
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}
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res = resJac
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case *bls12381.GT:
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resGT := new(bls12381.GT)
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resGT.Set(x)
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switch y := b.point.(type) {
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case *bls12381.GT:
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// It's multiplication, see https://github.com/neo-project/Neo.Cryptography.BLS12_381/issues/4.
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resGT.Mul(x, y)
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default:
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panic(fmt.Errorf("add: inconsistent bls12381 point types: %T and %T", x, y))
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}
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res = resGT
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default:
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panic(fmt.Errorf("add: unexpected bls12381 point type: %T", x))
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}
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return stackitem.NewInterop(blsPoint{point: res})
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}
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func scalarFromBytes(bytes []byte, neg bool) (*fr.Element, error) {
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alpha := new(fr.Element)
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if len(bytes) != fr.Bytes {
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return nil, fmt.Errorf("invalid multiplier: 32-bytes scalar is expected, got %d", len(bytes))
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}
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// The input bytes are in the LE form, so we can't use fr.Element.SetBytesCanonical as far
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// as it accepts BE.
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v, err := fr.LittleEndian.Element((*[fr.Bytes]byte)(bytes))
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if err != nil {
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return nil, fmt.Errorf("invalid multiplier: failed to decode scalar: %w", err)
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}
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*alpha = v
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if neg {
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alpha.Neg(alpha)
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}
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return alpha, nil
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}
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func (c *Crypto) bls12381Mul(_ *interop.Context, args []stackitem.Item) stackitem.Item {
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a, okA := args[0].(*stackitem.Interop).Value().(blsPoint)
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if !okA {
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panic("multiplier is not a bls12381 point")
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}
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mulBytes, err := args[1].TryBytes()
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if err != nil {
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panic(fmt.Errorf("invalid multiplier: %w", err))
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}
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neg, err := args[2].TryBool()
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if err != nil {
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panic(fmt.Errorf("invalid negative argument: %w", err))
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}
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alpha, err := scalarFromBytes(mulBytes, neg)
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if err != nil {
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panic(err)
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}
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alphaBi := new(big.Int)
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alpha.BigInt(alphaBi)
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var res interface{}
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switch x := a.point.(type) {
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case *bls12381.G1Affine:
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// The result is in Jacobian form in the reference implementation.
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g1Jac := new(bls12381.G1Jac)
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g1Jac.FromAffine(x)
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g1Jac.ScalarMultiplication(g1Jac, alphaBi)
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res = g1Jac
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case *bls12381.G1Jac:
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g1Jac := new(bls12381.G1Jac)
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g1Jac.ScalarMultiplication(x, alphaBi)
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res = g1Jac
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case *bls12381.G2Affine:
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// The result is in Jacobian form in the reference implementation.
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g2Jac := new(bls12381.G2Jac)
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g2Jac.FromAffine(x)
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g2Jac.ScalarMultiplication(g2Jac, alphaBi)
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res = g2Jac
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case *bls12381.G2Jac:
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g2Jac := new(bls12381.G2Jac)
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g2Jac.ScalarMultiplication(x, alphaBi)
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res = g2Jac
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case *bls12381.GT:
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gt := new(bls12381.GT)
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// C# implementation differs a bit from go's. They use double-and-add algorithm, see
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// https://github.com/neo-project/Neo.Cryptography.BLS12_381/blob/844bc3a4f7d8ba2c545ace90ca124f8ada4c8d29/src/Neo.Cryptography.BLS12_381/Gt.cs#L102
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// and https://en.wikipedia.org/wiki/Elliptic_curve_point_multiplication#Double-and-add,
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// Pay attention that C#'s Gt.Double() squares (not doubles!) the initial GT point.
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// Thus.C#'s scalar multiplication operation over Gt and Scalar is effectively an exponent.
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// Go's exponent algorithm differs a bit from the C#'s double-and-add in that go's one
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// uses 2-bits windowed method for multiplication. However, the resulting GT point is
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// absolutely the same between two implementations.
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gt.Exp(*x, alphaBi)
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res = gt
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default:
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panic(fmt.Errorf("mul: unexpected bls12381 point type: %T", x))
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}
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return stackitem.NewInterop(blsPoint{point: res})
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}
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func (c *Crypto) bls12381Pairing(_ *interop.Context, args []stackitem.Item) stackitem.Item {
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a, okA := args[0].(*stackitem.Interop).Value().(blsPoint)
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b, okB := args[1].(*stackitem.Interop).Value().(blsPoint)
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if !(okA && okB) {
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panic("some of the arguments are not a bls12381 point")
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}
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var (
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x *bls12381.G1Affine
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y *bls12381.G2Affine
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)
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switch p := a.point.(type) {
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case *bls12381.G1Affine:
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x = p
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case *bls12381.G1Jac:
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x = new(bls12381.G1Affine)
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x.FromJacobian(p)
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default:
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panic(fmt.Errorf("pairing: unexpected bls12381 point type (g1): %T", x))
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}
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switch p := b.point.(type) {
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case *bls12381.G2Affine:
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y = p
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case *bls12381.G2Jac:
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y = new(bls12381.G2Affine)
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y.FromJacobian(p)
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default:
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panic(fmt.Errorf("pairing: unexpected bls12381 point type (g2): %T", x))
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}
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gt, err := bls12381.Pair([]bls12381.G1Affine{*x}, []bls12381.G2Affine{*y})
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if err != nil {
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panic(fmt.Errorf("failed to perform pairing operation: %w", err))
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}
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return stackitem.NewInterop(blsPoint{>})
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}
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// Metadata implements the Contract interface.
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func (c *Crypto) Metadata() *interop.ContractMD {
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return &c.ContractMD
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}
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// Initialize implements the Contract interface.
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func (c *Crypto) Initialize(ic *interop.Context) error {
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return nil
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}
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// InitializeCache implements the Contract interface.
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func (c *Crypto) InitializeCache(blockHeight uint32, d *dao.Simple) error {
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return nil
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}
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// OnPersist implements the Contract interface.
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func (c *Crypto) OnPersist(ic *interop.Context) error {
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return nil
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}
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// PostPersist implements the Contract interface.
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func (c *Crypto) PostPersist(ic *interop.Context) error {
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return nil
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}
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