status-go/protocol/identity/utils.go

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package identity
import (
"errors"
"fmt"
"math/big"
"testing"
"github.com/ethereum/go-ethereum/crypto/secp256k1"
)
func ToColorID(pubkey string) (int64, error) {
const colorPalletLength = 12
pubkeyValue, ok := new(big.Int).SetString(pubkey, 0)
if !ok {
return 0, fmt.Errorf("invalid pubkey: %s", pubkey)
}
colorID := new(big.Int).Mod(pubkeyValue, new(big.Int).SetInt64(colorPalletLength-1)).Int64()
return colorID, nil
}
func ToBigBase(value *big.Int, base uint64) (res [](uint64)) {
toBigBaseImpl(value, base, &res)
return
}
func toBigBaseImpl(value *big.Int, base uint64, res *[](uint64)) {
bigBase := new(big.Int).SetUint64(base)
quotient := new(big.Int).Div(value, bigBase)
if quotient.Cmp(new(big.Int).SetUint64(0)) != 0 {
toBigBaseImpl(quotient, base, res)
}
*res = append(*res, new(big.Int).Mod(value, bigBase).Uint64())
}
// compressedPubKey = |1.5 bytes chars cutoff|20 bytes emoji hash|10 bytes color hash|1.5 bytes chars cutoff|
func Slices(compressedPubkey []byte) (res [4][]byte, err error) {
if len(compressedPubkey) != 33 {
return res, errors.New("incorrect compressed pubkey")
}
getSlice := func(low, high int, and string, rsh uint) []byte {
sliceValue := new(big.Int).SetBytes(compressedPubkey[low:high])
andValue, _ := new(big.Int).SetString(and, 0)
andRes := new(big.Int).And(sliceValue, andValue)
return new(big.Int).Rsh(andRes, rsh).Bytes()
}
res[0] = getSlice(0, 2, "0xFFF0", 4)
res[1] = getSlice(1, 22, "0x0FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0", 4)
res[2] = getSlice(21, 32, "0x0FFFFFFFFFFFFFFFFFFFF0", 4)
res[3] = getSlice(31, 33, "0x0FFF", 0)
return res, nil
}
func ToCompressedKey(pubkey string) ([]byte, error) {
pubkeyValue, ok := new(big.Int).SetString(pubkey, 0)
if !ok {
return nil, fmt.Errorf("invalid pubkey: %s", pubkey)
}
x, y := secp256k1.S256().Unmarshal(pubkeyValue.Bytes())
if x == nil || !secp256k1.S256().IsOnCurve(x, y) {
return nil, fmt.Errorf("invalid pubkey: %s", pubkey)
}
return secp256k1.CompressPubkey(x, y), nil
}
func ToBigInt(t *testing.T, str string) *big.Int {
res, ok := new(big.Int).SetString(str, 0)
if !ok {
t.Errorf("invalid conversion to int from %s", str)
}
return res
}