mdgomes opened a new issue, #2421:
URL: https://github.com/apache/shiro/issues/2421

   ### Search before asking
   
   - [x] I had searched in the [issues, **including closed 
issues**](https://github.com/apache/shiro/issues?q=is%3Aissue) and found no 
similar issues.
   
   
   ### Environment
   
   Java 21, shiro-core, plain java
   
   ### Shiro version
   
   2.0.6
   
   ### What was the actual outcome?
   
   Failure to match password
   
   ### What was the expected outcome?
   
   Password was matched correctly
   
   ### How to reproduce
   
   Hi, I'm having issues migrating from Shiro 1 to 2, and before anyone 
suggests, reseting passwords and asking users to create new ones is not a valid 
suggestion for my use case, I can't seem to figure out how to actually make 
Shiro2 work with private salts.
   
   Take a Shiro1 hashed password generated with the 1.x version (i.e. 1.13), 
take the plainText password and use the passwordsMatch(String,String) method to 
validate the passwords.
   
   Example saved password (`String storedPassword`): 
`$shiro1$SHA-256$500000$qP2nXnatLnmrr+LQeZxnQg==$ABXgt5ZDlgCRRyaxXORR/QFrpZMW77didcJ8P7AYs/M=`
   Associated plain text (`String plainText`): "admin"
   
   Setup:
   ```Java
   PasswordService passwordService = new DefaultPasswordService();
   DefaultHashService hashService = new DefaultHashService();
   hashService.setDefaultAlgorithmName("SHA-256");
   passwordService.setHashService(hashService);
   Shiro1CryptFormat hashFormat = new Shiro1CryptFormat();
   passwordService.setHashFormat(hashFormat);
   
   // Assert true: passwordService.passwordsMatch(plainText, storedPassword) 
fails
   ```
   
   Our saved password was created using a private salt. And previously (i.e. 
1.13) the passwordsMatch method was successful because of this the 
passwordsMatch(plainText, savedHash) did this:
   
   ```Java
       public boolean passwordsMatch(Object plaintext, Hash saved) {
           ByteSource plaintextBytes = createByteSource(plaintext);
   
           if (saved == null || saved.isEmpty()) {
               return plaintextBytes == null || plaintextBytes.isEmpty();
           } else {
               if (plaintextBytes == null || plaintextBytes.isEmpty()) {
                   return false;
               }
           }
   
           HashRequest request = buildHashRequest(plaintextBytes, saved);
   
           Hash computed = this.hashService.computeHash(request);
   
           return constantEquals(saved.toString(), computed.toString());
       }
   ```
   
   Specifically the `computeHash` call, which combines the private and public 
salts.
   
   The current 2.x method flow for the `passwordsMatch(Object plainText, Hash 
saved)` never calls `computeHash` so the passwords never match.
   
   So either I'm missing how Shiro 2.x handles the Shiro 1 format or the way to 
handle stored passwords is to override the DefaultPasswordService with support 
for using private salts.
   
   Can you help?
   
   
   ### Debug logs
   
   _No response_


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