Decompressing public key

[h0vhannes]

Hi,

decompressPublickey doesn't work at this moment. Actually, it is equal to undefined. This is due to the following commit in https://github.com/bitcoin/secp256k1
bitcoin-core/secp256k1@23cfa91#diff-0d77700fa6e05639431c962ffaa5365aL285
Here secp256k1_ec_pubkey_decompress was removed from the code, so decompressPublickey references nothing.

After all, I just want to decompress a compressed public key in node to encrypt a message with ECIES encryption having just a compressed key.

What should I do in this situation?

Thanks in advance, Hovhannes.

[h0vhannes]

This is the solution if someone is interested

var elliptic = require('elliptic');
var ec = new elliptic.ec('secp256k1');
var publicKeyUncompressed = ec.keyFromPublic(PublicKeyCompressed, 'hex').getPublic(false, 'hex');

[wanderer]

@h0vhannes thanks for the solution. I'm going to leave this open till I get a chance to write a better API for the keys.

[h0vhannes]

Thanks @wanderer, will wait for it !

[fanatid]

@h0vhannes with v2.x you can use publicKeyConvert

[h0vhannes]

thanks