neoneo-go/pkg/encoding/base58/base58.go

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package base58
import (
"bytes"
"github.com/mr-tron/base58"
"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
"github.com/pkg/errors"
)
// CheckDecode implements a base58-encoded string decoding with hash-based
// checksum check.
func CheckDecode(s string) (b []byte, err error) {
b, err = base58.Decode(s)
if err != nil {
return nil, err
}
if len(b) < 5 {
return nil, errors.New("invalid base-58 check string: missing checksum")
}
if !bytes.Equal(hash.Checksum(b[:len(b)-4]), b[len(b)-4:]) {
return nil, errors.New("invalid base-58 check string: invalid checksum")
}
// Strip the 4 byte long hash.
b = b[:len(b)-4]
return b, nil
}
// CheckEncode encodes given byte slice into a base58 string with hash-based
// checksum appended to it.
func CheckEncode(b []byte) string {
b = append(b, hash.Checksum(b)...)
return base58.Encode(b)
}