BLS signature for Node.js by WebAssembly

Abstract

This module is built with BLS_ETH=1 for Ethereum 2.0 spec.

News

• 2020/May/19 : Call bls.setETHmode(bls.ETH_MODE_DRAFT_07) once after bls.init() for BLS_ETH_MODE_DRAFT_07 defined at BLS12381G2_XMD:SHA-256_SSWU_RO_.
• setETHmode() supports hash-to-curve defined at draft-irtf-cfrg-hash-to-curve at March 2020.

Init as the followings:

bls.init(bls.BLS12_381)
bls.setETHmode(2)

(old) The new eth2.0 functions are supported. This mode will be removed in the future.

Init as the followings:

bls.init(bls.BLS12_381)
bls.setETHmode(1)

then, you can use the following functions.

bls-eth-wasm | eth2.0 spec name| ------|-----------------| SecretKey::sign|Sign| PublicKey::verify|Verify| Sign::aggregate|Aggregate| Sign::fastAggregateVerify|FastAggregateVerify| Sign::aggregateVerifyNoCheck|AggregateVerify|

The size of message must be 32 byte.

Check functions:

• verifySignatureOrder ; make deserialize check the correctness of the order
• Sign::isValidOrder ; check the correctness of the order
• verifyPublicKeyOrder ; make deserialize check the correctness of the order
• PublicKey::isValidOrder ; check the correctness of the order
• areAllMsgDifferent ; check that all messages are different each other

Old eth2.0 spec

The msg in the following means 40 bytes Uint8Array data.

• SecretKey.signHashWithDomain(msg)
  • sign msg by secretKey
• PublicKey.verifyHashWithDomain(sig, msg)
  • verify sig with msg by publickey
• Signature.verifyAggregatedHashWithDomain(pubVec, msgVec)
  • pubVec[i] = secVec[i].getPublicKey()
  • sigVec[i] = secVec[i].signHashWithDomain(msgVec[i])
  • aggSig = sum of sigVec[i]
  • aggSig.verifyAggregatedHashWithDomain(pubVec, msgVec)
  • see aggTest() in test.js

see bls

For Node.js

node test.js

License

modified new BSD License http://opensource.org/licenses/BSD-3-Clause

Author

MITSUNARI Shigeo([email protected]) Julian Meyer [email protected]

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