在Android平台使用JBCrypt进行哈希操作时出现报错

Hey there, let’s walk through fixing your BCrypt hashing problem step by step. First, let’s recap what you’ve shared: you’re testing BCrypt hashing, initially tried using an encryption function to generate the string to hash (which threw errors), then switched to a user-provided string. You’ve added the jbcrypt 0.4 library either as a standalone JAR or via Gradle dependency, but still hit an error during execution.

Here are targeted checks and fixes to resolve this:

• Fix your Gradle dependency syntax
  If you’re using a newer Gradle version, the compile keyword is deprecated. Replace it with implementation 'org.mindrot:jbcrypt:0.4' in your build.gradle file. After updating, run ./gradlew clean build to refresh dependencies and clear any cached issues.

• Validate input string constraints
  BCrypt has a hard limit of 72 characters for the input string. If your user-provided string exceeds this length, it might cause silent truncation or explicit errors. Make sure your input stays within this limit, or add explicit handling for longer strings if needed.

• Double-check your code implementation
  Ensure you’re using the library correctly. A minimal working example should look like this:

  import org.mindrot.jbcrypt.BCrypt;
  
  public class BCryptTest {
      public static void main(String[] args) {
          String userInput = "user-provided-password";
          // Generate salt and hash the input
          String hashedResult = BCrypt.hashpw(userInput, BCrypt.gensalt());
          // Verify the hash matches the original input
          boolean isMatch = BCrypt.checkpw(userInput, hashedResult);
          System.out.println("Password match status: " + isMatch);
      }
  }
  

  Your initial error with the encryption function might have happened because BCrypt expects a plaintext string, not an already encrypted one—stick to passing plain user input directly to hashpw.

• Check for conflicting dependencies
  Other libraries in your project might have conflicting versions of BCrypt or related classes. Run ./gradlew dependencies (for Gradle) to scan for duplicate artifacts, and exclude any unwanted conflicting versions if you find them.

• Confirm JDK compatibility
  jbcrypt 0.4 works best with JDK 8 and above. If you’re using an older JDK version, you might run into compatibility bugs. Verify your project’s JDK version meets this requirement.

If you’re still getting a specific error message, sharing the exact stack trace would help narrow down the issue even faster!

内容的提问来源于stack exchange，提问作者Cesar gutierrez