How to Resolve 'Encoded Password Does Not Look Like BCrypt' Error in Spring Security with OAuth2 and JWT?

What does the 'Encoded password does not look like BCrypt' error mean in Spring Security with OAuth2 and JWT?

@Bean
public PasswordEncoder passwordEncoder() {
    return new BCryptPasswordEncoder();
}

The 'Encoded password does not look like BCrypt' error typically occurs in a Spring Security application when an encoded password does not conform to the expected BCrypt format. This can arise from mismatches in password encoding strategies during user authentication with OAuth2 and JWT.

// Example of encoding a password using BCrypt
public void registerUser(String username, String rawPassword) {
    String encodedPassword = passwordEncoder().encode(rawPassword);
    // Save username and encodedPassword in the database;
}

Causes

• The password stored in the database is not encoded with BCrypt.
• The application is trying to verify a password that was encoded using a different encoding method, such as plain text or another hashing algorithm.
• Configuration issues in the Spring Security setup, leading to an incorrect password encoder being used.

Solutions

• Ensure that all passwords are stored in the database in a BCrypt encoded format. Use the BCryptPasswordEncoder for encoding passwords during user registration.
• Check the implementation of your UserDetailsService or AuthenticationProvider to confirm that the correct password encoder is being utilized.
• Implement a migration process to re-encode existing passwords stored in the database to BCrypt format, if necessary.

Mistake: Not using BCrypt for password encoding when starting the application.

Solution: Use BCryptPasswordEncoder in your Spring Security configuration to encode passwords.

Mistake: Assuming passwords are always stored in BCrypt format without validation.

Solution: Verify the format of stored passwords and re-encode them if needed.

Mistake: Different password encoding methods used across different parts of the application.

Solution: Standardize on the BCrypt encoding method throughout the application.