I have WIF private key and try convert to HEX private key (JAVA)

MixMAx123

full member

Activity: 161

Merit: 168

In Java:

Code:

public static String Base58ToHexString(String str, int laenge)
{
	char[] ALPHABET = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz".toCharArray();
	char[] a 	= str.toCharArray();
	BigInteger erg 	= new BigInteger("0");
	BigInteger b58 	= new BigInteger("58");
	int e = a.length-1;
	for(int j=0;j	{
		for(int i=0;i		{
		 		if(a[j]==ALPHABET[i]) 
		 		{
		   			BigInteger I = new BigInteger(String.valueOf(i));
		   			erg = erg.add(I.multiply(b58.pow(e)));
		 		}    
		}
		e--;
	}
	char[] c = erg.toString().toCharArray();
	int nullLaenge = 0;
	for(int i=0; a[i]=='1' && i	char[] EINS   = {'0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0'};
	char[] KeyOut = new char[nullLaenge + c.length];
	System.arraycopy(c, 0, KeyOut, nullLaenge, c.length);
	System.arraycopy(EINS, 0, KeyOut, 0, nullLaenge);
	String out = new String(KeyOut);
	BigInteger big = new BigInteger(out,10);
	out =  big.toString(16); 
	String nullen = "00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000";
	out = nullen+out;
	return out.substring(out.length()-laenge);
}

pooya87

legendary

Activity: 3472

Merit: 10611

Quote from: Sanka555 on December 19, 2021, 01:56:32 AM

Code:

	public static String wifToHex(String wifKey) throws Exception {
		byte[] bytes = Base58.decode(wifKey);
		String pk = bytesToHex(bytes);
		pk = pk.substring(2, pk.length() - 8);
		return pk;
	}

Your code lacks verification (byte length, first byte, last byte, checksum) and it also works only for uncompressed WIFs if you are given a compressed WIF your code will return a 33 byte hex result because you aren't removing the last byte in forth line here.

Sanka555

member

Activity: 96

Merit: 36

Many thanks to everyone. It's a pity I saw the last answer late)))
Here's what I wrote. It works Grin

Quote

   public static String wifToHex(String wifKey) throws Exception {
      byte[] bytes = Base58.decode(wifKey);
      String pk = bytesToHex(bytes);
      pk = pk.substring(2, pk.length() - Cool

;
      return pk;
   }

public static String bytesToHex(byte[] in) {
      final StringBuilder builder = new StringBuilder();
      for (byte b : in) {
         builder.append(String.format("%02x", b));
      }
      return builder.toString();
   }

PawGo

legendary

Activity: 952

Merit: 1385

Of course my dear Sanka555, this is the solution:

Code:

String toCheck = "5KWDpqqbx24hZmqMzHUAsVZVEJiJukK4MP25ZuyDMapAVs4s6p3";
boolean compressed = toCheck.length()==52;
try{
byte[] bytes = Base58.decode(toCheck);
ECKey ecKey = ECKey.fromPrivate(Arrays.copyOfRange(bytes, 1, bytes.length - 4), compressed);
String privKey = ecKey.getPrivateKeyAsHex();
System.out.println(privKey);
}catch(Exception e){
System.err.println(e.getLocalizedMessage());
}

I hope your project is progressing well ;-)

I have told you already 5 times - check sourcecode of my https://github.com/PawelGorny/WifSolver, you will find answers for all (ok, most of) your questions.

BlackHatCoiner

legendary

Activity: 1512

Merit: 7340

Farewell, Leo

Disclaimer: I want you to understand the technical part. I could just give you few lines of code that do the work, but I insist on acknowledging this procedure.

A WIF private key is a base58 encoding of four things;

A version byte prefix. (0x80 for mainnet)
The 256-bit number which is the private key.
A compression byte suffix. (0x01 if the public key is compressed, nothing if it's uncompressed)
A checksum which is the first 4 bytes of the double SHA256 hash of the above three.

For instance, let's say that I want to convert to WIF the following number:

Code:

b483cd7d8a5245e6d7c4fc4b06de669a15ce3256b7c4d0a08a5a0ab75a0db46d

Step 1:

Code:

Step 2:

Code:

80b483cd7d8a5245e6d7c4fc4b06de669a15ce3256b7c4d0a08a5a0ab75a0db46d

Step 3: (Compressed public key)

Code:

80b483cd7d8a5245e6d7c4fc4b06de669a15ce3256b7c4d0a08a5a0ab75a0db46d01

(Double hash of the above is 01c46123132816f6f7158ddb53fad901bcc9896b84d1b960c26f8dd62e42039a)

Thus, step 4:

Code:

80b483cd7d8a5245e6d7c4fc4b06de669a15ce3256b7c4d0a08a5a0ab75a0db46d0101c46123

By converting it to base58 you get:

Code:

L3GcE8o5kgmRhJF1gavfUMjHsz2tSgZYseQeQbD1iTkHBvQoR7A2

To achieve what you want, just go backwards.

Code:

5KWDpqqbx24hZmqMzHUAsVZVEJiJukK4MP25ZuyDMapAVs4s6p3

Decode the base58:

Code:

80DE5FBB6104D65246E31486BF004701E8A9FA0C388BFA0D6CB8E6F1C1A117CB9006F6CF1C

Remove the last 8 characters:

Code:

80DE5FBB6104D65246E31486BF004701E8A9FA0C388BFA0D6CB8E6F1C1A117CB90

I can recognize it's an uncompressed address. Therefore, you don't remove the last 2 characters. Just remove the prefix at the start and you have your number:

Code:

DE5FBB6104D65246E31486BF004701E8A9FA0C388BFA0D6CB8E6F1C1A117CB90

NeuroticFish

legendary

Activity: 3668

Merit: 6382

Looking for campaign manager? Contact icopress!

You should start with https://en.bitcoin.it/wiki/Wallet_import_format
From want I understand you want to do the second part.

For base58 decoder, take a look if this works: https://gist.github.com/vrotaru/1753908

I'd add that it may be nice if you do then the steps from the first part and verify the checksum for the sake of your users.

Sanka555

member

Activity: 96

Merit: 36

I need to do like in this calculator https://secretscan.org/PrivateKeyWif
the entrance is invited
5KWDpqqbx24hZmqMzHUAsVZVEJiJukK4MP25ZuyDMapAVs4s6p3

at the output I get
DE5FBB6104D65246E31486BF004701E8A9FA0C388BFA0D6CB8E6F1C1A117CB90

how to do it on JAva?

i tried to convert wif to hex both as string and as byte array.

the correct answer is not obtained.

I would be very grateful for any ideas

Topic: I have WIF private key and try convert to HEX private key (JAVA) (Read 224 times)