Can't verify testnet signature

[olalonde]

I've been trying to verify the following testnet message/signature with bitcore-message, but keep getting this stack trace.

message: localhost:3000
address: mx5u3nqdPpzvEZ3vfnuUQEyHg3gHd8zrrH
signature: G4Bi9/Z7hF17MpE9t7Txm3n0aBH6yCVLFB1VWzkZRz17FxErgA/oOWmwXWYr6/ILlRCmeYjc8MeI8PQWYAElZY8=

Invalid Argument: Error: i must be 0, 1, 2, or 3
Error
    at Error.NodeError (/src/node_modules/bitcore/lib/errors/index.js:20:41)
    at Object.module.exports.checkArgument (/src/node_modules/bitcore/lib/util/preconditions.js:14:13)
    at Function.Signature.fromCompact (/src/node_modules/bitcore/lib/crypto/signature.js:41:5)
    at Message.verify (/src/node_modules/bitcore-message/lib/message.js:92:29)
    at authenticate (/src/server/helpers/authenticate.js:38:32)
    at Layer.handle [as handle_request] (/src/node_modules/express/lib/router/layer.js:82:5)

[ghost]

Can you post your code to see what you're doing wrong?
Judging by your error message, it could be a "bitcore" error, rather than a "bitcore-message" error.

[FoundationAwesome]

BUMP. Got the same error. Just followed the example instructions how to sign and verify a message. Mainnet this time though.

Ironically I came from bitcoinjs-lib where the documentation is also outdated.

[braydonf]

There is a known issue with uncompressed public keys that will produced the same error message: #12

[FoundationAwesome]

Took the key from here: https://brainwallet.org/#sign

5KYZdUEo39z3FPrtuX2QbbwGnNP5zTd7yyr2SC1j299sBCnWjss

[FoundationAwesome]

I can confirm that this bug does not happen with compressed keys. Wondering now how to workarround this bug.

[braydonf]

Adding support for uncompressed public keys in Signature.fromCompact: https://github.com/bitpay/bitcore/blob/master/lib/crypto/signature.js#L35 should fix the issue.

[FoundationAwesome]

Maybe some expert in crypto-signing wants to take on this todo? Would be really useful!

[ghost]

I've found that bitcoinjs-lib is much cleaner than bitcore's... Not sure why they don't have as many stars.

[braydonf]

Should be fixed in: bitpay/bitcore#1250

[braydonf]

Should be fixed here with: #19