public static byte[] wifToPrivateKey(String string) {
String wif = string;
byte[] wif_enc = new byte[wif.length()];
wif_enc = Base58.decode(wif);
byte[] wif_enc_fin = new byte[wif_enc.length - 5];
// Drop first and last four bytes
System.arraycopy(wif_enc, 1, wif_enc_fin, 0, wif_enc.length - 5);
return (wif_enc_fin);
}
public static byte[] wifChecksum(String string) {
byte[] wif_enc = Base58.decode(string);
byte[] wif_enc_sh = new byte[wif_enc.length - 4];
System.arraycopy(wif_enc, 0, wif_enc_sh, 0, wif_enc.length - 4);
byte[] hash = new byte[256];
byte[] hash2 = new byte[256];
try {
MessageDigest digest = MessageDigest.getInstance("SHA-256");
hash = digest.digest(wif_enc_sh);
hash2 = digest.digest(hash);
} catch (Exception e) {
// TODO: handle exception
}
byte[] checksum = new byte[4];
System.arraycopy(hash2, 0, checksum, 0, checksum.length);
return (checksum);
}