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POHashing password and comparing with MD5
 

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  1. POHashing password and comparing with MD5
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    <p>I have the following requirement.</p> <pre><code>1. save a user password converted to hash(digested) 2. when comparing with data base, add random bytes with the password given from user 3. now send the random bytes added password to DAO class 4. separate the random byte from password 5. compare with the stored hashed(digested) password </code></pre> <p>I tried some thing similar but it gives array out of bound exception.</p> <pre><code>package poc; import com.sun.xml.internal.ws.message.ByteArrayAttachment; import java.io.ByteArrayOutputStream; import java.io.FileInputStream; import java.io.FileOutputStream; import java.security.MessageDigest; import java.security.SecureRandom; import java.util.Arrays; public class HashedPassword { public static final String CRYPTOGRAPHY_ALGORITHM = "MD5"; public static final String CHAR_SET = "UTF8"; public static void main(String[] arg){ System.out.println(createPassword("r14@17*$")); } public static byte[] createPassword(String password){ byte[] salt = new byte[12]; byte[] digestedPassword =null; byte[] digestedPasswordPwd =null; try { SecureRandom random = new SecureRandom(); random.nextBytes(salt); MessageDigest mdPassword = MessageDigest.getInstance(CRYPTOGRAPHY_ALGORITHM); MessageDigest mdPasswordPawd = MessageDigest.getInstance(CRYPTOGRAPHY_ALGORITHM); mdPassword.update(salt); mdPassword.update(password.getBytes(CHAR_SET)); mdPasswordPawd.update(password.getBytes(CHAR_SET)); digestedPassword = mdPassword.digest(); digestedPasswordPwd = mdPasswordPawd.digest(); byte[] resultBytes= new byte[1000]; System.arraycopy(digestedPassword, 11, resultBytes,0,digestedPassword.length); if(Arrays.equals(resultBytes, digestedPasswordPwd)){ System.out.println("match"); }else{ System.out.println("no-match"); } } catch (Exception ex) { ex.printStackTrace(); } System.out.println("digestedPassword : "+digestedPassword); System.out.println("digestedPasswordPwd : "+digestedPasswordPwd); return digestedPassword; } } </code></pre> <p>Stacktrace : </p> <pre><code>java.lang.ArrayIndexOutOfBoundsException digestedPassword : [B@9980d5 digestedPasswordPwd : [B@1d95492 [B@9980d5 at java.lang.System.arraycopy(Native Method) at poc.HashedPassword.createPassword(HashedPassword.java:43) at poc.HashedPassword.main(HashedPassword.java:23) </code></pre> <p>so please help me how to go about it</p> <p>Kind Regards</p>
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    1. COPost Stack Trace Please!
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      1. USppeterka
    2. COThanks for the comment, updated with strack Trace.
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    3. COWhat is the length of digestedPassword array after `digestedPassword = mdPassword.digest();` ?
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      1. POHashing password and comparing with MD5
      1. USDavid Soroko
 

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