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use go version bls implementation (#39)
* replace github.com/herumi/bls-go-binary with github.com/consensys/gnark-crypto for bls
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,70 +1,100 @@ | ||
| package bls | ||
|
|
||
| import "github.com/herumi/bls-go-binary/bls" | ||
| import ( | ||
| "encoding/hex" | ||
| bls "github.com/consensys/gnark-crypto/ecc/bls12-381" | ||
| "github.com/consensys/gnark-crypto/ecc/bls12-381/fr" | ||
| "math/big" | ||
| ) | ||
|
|
||
| const ( | ||
| dstG1 = "BLS_SIG_BLS12381G1_XMD:SHA-256_SSWU_RO_NUL_" | ||
| publicKeyGenerator = "1 0x24aa2b2f08f0a91260805272dc51051c6e47ad4fa403b02b4510b647ae3d1770bac0326a805bbefd48056c8c121bdb8 0x13e02b6052719f607dacd3a088274f65596bd0d09920b61ab5da61bbdc7f5049334cf11213945d57e5ac7d055d042b7e 0x0ce5d527727d6e118cc9cdc6da2e351aadfd9baa8cbdd3a76d429a695160d12c923ac9cc3baca289e193548608b82801 0x0606c4a02ea734cc32acd2b02bc28b99cb3e287e85a763af267492ab572e99ab3f370d275cec1da1aaa9075ff05f79be" | ||
| dstG1 = "BLS_SIG_BLS12381G1_XMD:SHA-256_SSWU_RO_NUL_" | ||
| ) | ||
|
|
||
| func init() { | ||
| if err := bls.Init(bls.BLS12_381); err != nil { | ||
| panic(err) | ||
| } | ||
|
|
||
| // Set Ethereum serialization format. | ||
| bls.SetETHserialization(true) | ||
| if err := bls.SetMapToMode(bls.IRTF); err != nil { | ||
| panic(err) | ||
| } | ||
|
|
||
| // Set the generator of G2. see https://www.ietf.org/archive/id/draft-irtf-cfrg-pairing-friendly-curves-11.html#section-4.2.1 | ||
| var gen bls.PublicKey | ||
| if err := gen.SetHexString(publicKeyGenerator); err != nil { | ||
| panic(err) | ||
| } | ||
| if err := bls.SetGeneratorOfPublicKey(&gen); err != nil { | ||
| panic(err) | ||
| } | ||
|
|
||
| if err := bls.SetDstG1(dstG1); err != nil { | ||
| panic(err) | ||
| } | ||
| } | ||
|
|
||
| type PublicKey = bls.PublicKey | ||
| type PublicKey bls.G2Affine | ||
|
|
||
| // PublicKeyFromBytes returns a PublicKey from a byte slice. | ||
| func PublicKeyFromBytes(b []byte) (*PublicKey, error) { | ||
| var pub bls.PublicKey | ||
| return &pub, pub.Deserialize(b) | ||
| var pub bls.G2Affine | ||
| err := pub.Unmarshal(b) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| res := PublicKey(pub) | ||
| return &res, err | ||
| } | ||
|
|
||
| // PublicKeyFromHexString returns a PublicKey from a hex string. | ||
| func PublicKeyFromHexString(s string) (*PublicKey, error) { | ||
| var pub bls.PublicKey | ||
| return &pub, pub.DeserializeHexStr(s) | ||
| b, err := hex.DecodeString(s) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return PublicKeyFromBytes(b) | ||
| } | ||
|
|
||
| type SecretKey = bls.SecretKey | ||
| type SecretKey fr.Element | ||
|
|
||
| // NewSecretKeyByCSPRNG returns a new SecretKey generated by CSPRNG. | ||
| func NewSecretKeyByCSPRNG() *SecretKey { | ||
| var sk bls.SecretKey | ||
| sk.SetByCSPRNG() | ||
| return &sk | ||
| var sk fr.Element | ||
| _, err := sk.SetRandom() | ||
| if err != nil { | ||
| return nil | ||
| } | ||
| res := SecretKey(sk) | ||
| return &res | ||
| } | ||
|
|
||
| func (sk *SecretKey) PublicKey() *PublicKey { | ||
| _, _, _, g2Gen := bls.Generators() | ||
|
|
||
| el := fr.Element(*sk) | ||
| v := el.BigInt(big.NewInt(0)) | ||
|
|
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| pk := g2Gen.ScalarMultiplication(&g2Gen, v) | ||
| return (*PublicKey)(pk) | ||
| } | ||
|
|
||
| func (sk *SecretKey) Sign(msg []byte) *Signature { | ||
| el := fr.Element(*sk) | ||
| v := el.BigInt(big.NewInt(0)) | ||
| g1, _ := bls.HashToG1(msg, []byte(dstG1)) | ||
| sig := g1.ScalarMultiplication(&g1, v) | ||
| return (*Signature)(sig) | ||
| } | ||
|
|
||
| type Signature = bls.Sign | ||
| type Signature bls.G1Affine | ||
|
|
||
| // SignatureFromBytes returns a Signature from a byte slice. | ||
| func SignatureFromBytes(b []byte) (*Signature, error) { | ||
| var sig bls.Sign | ||
| return &sig, sig.Deserialize(b) | ||
| var sig bls.G1Affine | ||
| _, err := sig.SetBytes(b) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| res := Signature(sig) | ||
| return &res, err | ||
| } | ||
|
|
||
| // SignatureFromHexString returns a Signature from a hex string. | ||
| func SignatureFromHexString(s string) (*Signature, error) { | ||
| var sig bls.Sign | ||
| return &sig, sig.DeserializeHexStr(s) | ||
| b, err := hex.DecodeString(s) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return SignatureFromBytes(b) | ||
| } | ||
|
|
||
| func (sig *Signature) Verify(pk *PublicKey, msg []byte) bool { | ||
| g1, _ := bls.HashToG1(msg, []byte(dstG1)) | ||
| _, _, _, g2 := bls.Generators() | ||
| var g2n bls.G2Affine | ||
| g2n.Neg(&g2) | ||
|
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||
| valid, err := bls.PairingCheck([]bls.G1Affine{bls.G1Affine(*sig), g1}, []bls.G2Affine{g2n, bls.G2Affine(*pk)}) | ||
| if err != nil { | ||
| return false | ||
| } | ||
| return valid | ||
| } |
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