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March 6, 2022 21:21
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* | |
Verifying Drands BLS12-381 Signatures in GoLang | |
Using the following randomness payloads: | |
{ | |
"round": 1657526, | |
"randomness": "58b26a65bf4032555748c2949311abb2c4f580e7d7d7f70b13d0533b793c4c7d", | |
"signature": "8434e45af135f363b04b792c1d77b83e36ef66829b0a09f7eed058103429f0e7f759ebf6d001cf73e9138f5b7a7f04b602c4167390c323432562d6367e09169422707a9778eba260c4d6434ea5e1d2c81462a4e3cd430990aebc593f4ae7517c", | |
"previous_signature": "ab9e594732265dd737b536a144fb955bfeabe929116fc78f7bb740de3f43629691cabcec507eeb39a98d51be11942cf4062b0a38dd1be18be5e23bea7efd3935bb23032dba4da0374899e583feb937119f33f6b645048e0e91cde0de00e3e9ee" | |
}, | |
{ | |
"round": 1657527, | |
"randomness": "f62110e3f46d3f89be0dfa38b740fb8653f7106251cd0c360021d2d7d60b3ceb", | |
"signature": "83480a950bd42bc20cc0f34dfa80901322ca99c0cf0cb105bd87a64bc134a607eb53d0a21e7e687ca7315ad0c15124a31863c20d6a41b0bb4f0dcfe5c348797c042807964069e279026306f989ff67523052ddba82c0862800f002dc5de40772", | |
"previous_signature": "8434e45af135f363b04b792c1d77b83e36ef66829b0a09f7eed058103429f0e7f759ebf6d001cf73e9138f5b7a7f04b602c4167390c323432562d6367e09169422707a9778eba260c4d6434ea5e1d2c81462a4e3cd430990aebc593f4ae7517c" | |
} | |
The chain info: | |
{ | |
"public_key": "868f005eb8e6e4ca0a47c8a77ceaa5309a47978a7c71bc5cce96366b5d7a569937c529eeda66c7293784a9402801af31", | |
"period": 30, | |
"genesis_time": 1595431050, | |
"hash": "8990e7a9aaed2ffed73dbd7092123d6f289930540d7651336225dc172e51b2ce", | |
"groupHash": "176f93498eac9ca337150b46d21dd58673ea4e3581185f869672e59fa4cb390a" | |
} | |
*/ | |
package main | |
import ( | |
"bytes" | |
"crypto/sha256" | |
"encoding/binary" | |
"encoding/hex" | |
bls "github.com/kilic/bls12-381" | |
) | |
func main() { | |
var payload = Payload{ | |
prevSig: fromHex("8434e45af135f363b04b792c1d77b83e36ef66829b0a09f7eed058103429f0e7f759ebf6d001cf73e9138f5b7a7f04b602c4167390c323432562d6367e09169422707a9778eba260c4d6434ea5e1d2c81462a4e3cd430990aebc593f4ae7517c"), | |
currSig: fromHex("83480a950bd42bc20cc0f34dfa80901322ca99c0cf0cb105bd87a64bc134a607eb53d0a21e7e687ca7315ad0c15124a31863c20d6a41b0bb4f0dcfe5c348797c042807964069e279026306f989ff67523052ddba82c0862800f002dc5de40772"), | |
randomness: fromHex("f62110e3f46d3f89be0dfa38b740fb8653f7106251cd0c360021d2d7d60b3ceb"), | |
publicKey: fromHex("868f005eb8e6e4ca0a47c8a77ceaa5309a47978a7c71bc5cce96366b5d7a569937c529eeda66c7293784a9402801af31"), | |
currRound: 1657527, | |
} | |
//check byte array was consumed correctly | |
//var num = hex.EncodeToString(in) | |
// fmt.Println(num) | |
var engine = bls.NewEngine() | |
var G1 = bls.G1One | |
var SIG, err_sig = bls.NewG2().FromCompressed(payload.currSig) | |
if err_sig != nil { | |
println("error") | |
println(err_sig.Error()) | |
} | |
var pairOne = engine.AddPair(&G1, SIG).Result() | |
var pub, err_pub = bls.NewG1().FromCompressed(payload.publicKey) | |
if err_pub != nil { | |
println("error") | |
println(err_pub.Error()) | |
} | |
var g = bls.NewG2() | |
msg_hashed := Message(payload.currRound, payload.prevSig) | |
var domain = []byte("BLS_SIG_BLS12381G2_XMD:SHA-256_SSWU_RO_NUL_") | |
msg_on_curve, err_msg := g.HashToCurve(msg_hashed, domain) | |
if err_msg != nil { | |
println("error") | |
println(err_msg.Error()) | |
} | |
var pairTwo = engine.AddPair(pub, msg_on_curve).Result() | |
GT := engine.GT() | |
if !GT.IsValid(pairOne) { | |
println("pairing One result is not valid, please check G1 and SIG") | |
} | |
if !GT.IsValid(pairTwo) { | |
println("pairing One result is not valid, please check Public key and msg") | |
} | |
var equalPairs = pairOne.Equal(pairTwo) | |
print("The two pairs are ") | |
println(equalPairs) | |
} | |
type Payload struct { | |
prevSig []byte | |
currSig []byte | |
randomness []byte | |
publicKey []byte | |
currRound uint64 | |
} | |
func fromHex(hexStr string) []byte { | |
b, err := hex.DecodeString(hexStr) | |
if err != nil { | |
panic("invalid hex" + err.Error()) | |
} | |
return b | |
} | |
func Message(currRound uint64, prevSig []byte) []byte { | |
h := sha256.New() | |
_, _ = h.Write(prevSig) | |
_, _ = h.Write(RoundToBytes(currRound)) | |
return h.Sum(nil) | |
} | |
func RoundToBytes(r uint64) []byte { | |
var buff bytes.Buffer | |
_ = binary.Write(&buff, binary.BigEndian, r) | |
return buff.Bytes() | |
} |
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