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openp2m_crypt.java

openp2m_crypt.java
Posted May 21, 2006
Authored by Fabiano Reese Righetti

Password encryption / decryption utility for OpenP2M.

tags | cracker
SHA-256 | d1461af4759e1ea090f8fc54fe1f7d61f94f92e6d433b080cac7c4b9431e37e0

openp2m_crypt.java

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/*
* OpenP2M Crypt Break
*
* Encrypt and decrypt password for program OpenP2M.
*
* 06/05/2006 - frighetti AT cascavel.pm.org
*/

import java.lang.String;
import java.math.BigInteger;

class RSA
{
private BigInteger n, d, e;

public RSA()
{
n = new BigInteger("849613389756793222155926708916406526722137707856633" +
"710486677120848018911369507691157686832490341300851" +
"2741498700587851315525414979963642608998181269527941");
d = new BigInteger("169922677951358644431185341783281305344427541571326" +
"742097335424169603782273897848542211926500549462803" +
"9077923965408489035118957525416966246759228390003017");
e = new BigInteger("5");
}

public final String encrypt(String s) {
return "_" + encrypt(new BigInteger(s.getBytes())).toString(36);
}

private BigInteger encrypt(BigInteger message)
{
return message.modPow(e, n);
}

public final String decrypt(String s) throws NumberFormatException
{
return s.startsWith("_") ?
new String(decrypt(new BigInteger(s.substring(1), 36)).toByteArray()) :
new String(decrypt(new BigInteger(s)).toByteArray());
}

private BigInteger decrypt(BigInteger message)
{
return message.modPow(d, n);
}
}

public class openp2m_crypt
{
private String enc = null, dec = null;

public static void main(String[] args)
{
if (args.length <= 1)
usage();

System.out.println(" " + parseargs(args) + "\n");
}

public static void usage()
{
System.out.println("Usage: \n" +
" java openp2m_crypt [-c <string for crypt> | -d <password crypted>]\n" +
" -c : criptography password for openp2m\n" +
" -d : decriptography password for openp2m\n");
System.exit(1);

}

public static String parseargs(String[] args)
{
RSA rsa = new RSA();

for (int i = 0; i < args.length; i++)
{
if (args[i].equals("-c") && i+1<args.length)
{
return rsa.encrypt(args[++i]);
}
else if (args[i].equals("-d") && i+1<args.length)
{
return rsa.decrypt(args[++i]);
}
}

return "";
}
}
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