mirror of
https://github.com/nspcc-dev/neo-go.git
synced 2024-12-23 13:41:37 +00:00
372 lines
12 KiB
Go
372 lines
12 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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"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/config"
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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/util"
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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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"golang.org/x/crypto/sha3"
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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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// HashFunc is a delegate representing a hasher function with 256 bytes output length.
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type HashFunc func([]byte) util.Uint256
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// NamedCurveHash identifies a pair of named elliptic curve and hash function.
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type NamedCurveHash byte
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// Various pairs of named elliptic curves and hash functions.
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const (
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Secp256k1Sha256 NamedCurveHash = 22
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Secp256r1Sha256 NamedCurveHash = 23
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Secp256k1Keccak256 NamedCurveHash = 122
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Secp256r1Keccak256 NamedCurveHash = 123
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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.BuildHFSpecificMD(c.ActiveIn())
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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.verifyWithECDsaPreCockatrice, 1<<15, callflag.NoneFlag, config.HFDefault, config.HFCockatrice)
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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("curveHash", smartcontract.IntegerType))
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md = newMethodAndPrice(c.verifyWithECDsa, 1<<15, callflag.NoneFlag, config.HFCockatrice)
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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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desc = newDescriptor("keccak256", smartcontract.ByteArrayType,
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manifest.NewParameter("data", smartcontract.ByteArrayType))
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md = newMethodAndPrice(c.keccak256, 1<<15, callflag.NoneFlag, config.HFCockatrice)
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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) verifyWithECDsaPreCockatrice(_ *interop.Context, args []stackitem.Item) stackitem.Item {
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return verifyWithECDsaGeneric(args, false)
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}
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func (c *Crypto) verifyWithECDsa(_ *interop.Context, args []stackitem.Item) stackitem.Item {
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return verifyWithECDsaGeneric(args, true)
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}
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func verifyWithECDsaGeneric(args []stackitem.Item, allowKeccak bool) 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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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, hasher, err := curveHasherFromStackitem(args[3], allowKeccak)
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if err != nil {
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panic(fmt.Errorf("invalid curveHash stackitem: %w", err))
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}
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hashToCheck := hasher(msg)
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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 curveHasherFromStackitem(si stackitem.Item, allowKeccak bool) (elliptic.Curve, HashFunc, error) {
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curve, err := si.TryInteger()
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if err != nil {
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return nil, nil, err
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}
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if !curve.IsInt64() {
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return nil, 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(Secp256k1Sha256):
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return secp256k1.S256(), hash.Sha256, nil
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case int64(Secp256r1Sha256):
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return elliptic.P256(), hash.Sha256, nil
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case int64(Secp256k1Keccak256):
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if !allowKeccak {
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return nil, nil, fmt.Errorf("%w: keccak hash", errors.ErrUnsupported)
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}
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return secp256k1.S256(), Keccak256, nil
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case int64(Secp256r1Keccak256):
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if !allowKeccak {
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return nil, nil, fmt.Errorf("%w: keccak hash", errors.ErrUnsupported)
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}
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return elliptic.P256(), Keccak256, nil
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default:
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return nil, nil, fmt.Errorf("%w: unknown curve/hash", errors.ErrUnsupported)
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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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p := new(blsPoint)
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err = p.FromBytes(buf)
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if err != nil {
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panic(err)
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}
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return stackitem.NewInterop(*p)
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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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p, err := blsPointAdd(a, b)
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if err != nil {
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panic(err)
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}
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return stackitem.NewInterop(p)
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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. Confirmed by https://github.com/neo-project/neo/issues/2647#issuecomment-1129849870
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// and by https://github.com/nspcc-dev/neo-go/pull/3043#issuecomment-1733424840.
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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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p, err := blsPointMul(a, alphaBi)
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if err != nil {
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panic(err)
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}
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return stackitem.NewInterop(p)
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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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p, err := blsPointPairing(a, b)
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if err != nil {
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panic(err)
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}
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return stackitem.NewInterop(p)
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}
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func (c *Crypto) keccak256(_ *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(Keccak256(bs).BytesBE())
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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, hf *config.Hardfork, newMD *interop.HFSpecificContractMD) 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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// ActiveIn implements the Contract interface.
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func (c *Crypto) ActiveIn() *config.Hardfork {
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return nil
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}
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// Keccak256 hashes the incoming byte slice using the
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// keccak256 algorithm.
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func Keccak256(data []byte) util.Uint256 {
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var hash util.Uint256
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hasher := sha3.NewLegacyKeccak256()
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_, _ = hasher.Write(data)
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hasher.Sum(hash[:0])
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return hash
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}
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