status-im/status-go

package datasync

import (
    "crypto/ecdsa"

    "github.com/status-im/mvds/state"

    "github.com/status-im/status-go/eth-node/crypto"
)

func ToGroupID(data []byte) state.GroupID {
    g := state.GroupID{}
    copy(g[:], data[:])
    return g
}

// ToOneToOneGroupID returns a groupID for a onetoonechat, which is taken by
// concatenating the bytes of the compressed keys, in ascending order by X
func ToOneToOneGroupID(key1 *ecdsa.PublicKey, key2 *ecdsa.PublicKey) state.GroupID {
    pk1 := crypto.CompressPubkey(key1)
    pk2 := crypto.CompressPubkey(key2)
    var groupID []byte
    if key1.X.Cmp(key2.X) == -1 {
        groupID = append(pk1, pk2...)
    } else {
        groupID = append(pk2, pk1...)
    }

    return ToGroupID(crypto.Keccak256(groupID))
}