MD5 Tool Development Notes in HarmonyOS - Using the crypto-js Third-party Library

About HarmonyOS 5

HarmonyOS 5 (also known as HarmonyOS Next) represents a revolutionary step in the evolution of Huawei's distributed operating system. As someone who has been following its development closely, I can attest to the remarkable improvements in this version. The system's microkernel architecture not only enhances security but also provides unprecedented flexibility in cross-device collaboration. What excites me most about HarmonyOS 5 is its focus on developer experience - the new ArkTS language, enhanced UI components, and improved debugging tools have made development much more efficient. The distributed capabilities allow us to create truly seamless experiences across different devices, from smartphones to tablets, smart TVs, and IoT devices.

About the Author

I am a dedicated HarmonyOS developer based in China, with over three years of experience in the ecosystem. My journey with HarmonyOS began with its early versions, and I've witnessed its remarkable evolution. As a developer who has contributed to several open-source HarmonyOS projects, I've gained valuable insights into its architecture and best practices. I'm particularly passionate about security tools and cryptographic functions, which led me to develop this comprehensive MD5 tool module. Through my blog and GitHub repositories, I've been sharing my experiences and helping other developers navigate the exciting world of HarmonyOS development.

Basic Knowledge

Let's first understand MD5:

What is MD5
- Message Digest Algorithm 5
- 128-bit hash function
- One-way function
- Fixed output length
MD5 Characteristics
- Fast computation
- Fixed output size
- Deterministic output
- Collision resistance
Common Uses
- File integrity checking
- Password hashing
- Digital signatures
- Data verification
Security Considerations
- Not suitable for passwords
- Vulnerable to collisions
- Consider using SHA-256
- Use with caution
Best Practices
- Use for non-security purposes
- Combine with other methods
- Consider alternatives
- Document limitations

Preface

Recently, while developing the HarmonyOS Developer Toolbox, we wanted to add an MD5 tool feature. This feature is mainly used to calculate MD5 hashes for various purposes. We chose to use the crypto-js library for its reliability and ease of use.

I. Feature Description

1.1 Main Features

Calculate MD5 hash
Support text input
Support file input
Show hash in hex
Copy to clipboard
Compare hashes
Batch processing

1.2 Interface Features

Text input field
File selection
Hash display
Copy button
Compare button
History view
Settings panel

II. Implementation Process

2.1 Implementation Principle

MD5 calculation involves several steps:

Input Processing
- Handle text input
- Process file input
- Validate input
- Prepare data
Hash Calculation
- Use crypto-js library
- Process in chunks
- Handle large files
- Show progress
Output Formatting
- Convert to hex
- Format display
- Handle errors
- Show status
File Handling
- Read file content
- Process chunks
- Handle errors
- Show progress
User Interface
- Show progress
- Display results
- Handle errors
- Provide feedback

2.2 Code Implementation

import CryptoJS from 'crypto-js';

@Entry
@Component
struct MD5Calculator {
  @State input: string = '';               // Input text
  @State hash: string = '';                // MD5 hash
  @State isProcessing: boolean = false;    // Processing status
  @State progress: number = 0;             // Progress percentage
  @State history: string[] = [];           // Calculation history

  // Calculate MD5 hash
  private calculateMD5() {
    try {
      this.isProcessing = true;
      this.progress = 0;

      // Process input
      if (!this.input) {
        throw new Error('Input is empty');
      }

      // Calculate hash
      const hash = CryptoJS.MD5(this.input).toString();

      // Update state
      this.hash = hash;
      this.history.unshift({
        input: this.input,
        hash: hash,
        timestamp: new Date().toISOString()
      });

      // Limit history size
      if (this.history.length > 10) {
        this.history.pop();
      }

      this.progress = 100;
    } catch (err) {
      console.error('Calculation failed:', err);
      throw err;
    } finally {
      this.isProcessing = false;
    }
  }

  // Calculate file hash
  private async calculateFileHash(file: File) {
    try {
      this.isProcessing = true;
      this.progress = 0;

      // Read file
      const reader = new FileReader();
      reader.onprogress = (event) => {
        if (event.lengthComputable) {
          this.progress = (event.loaded / event.total) * 100;
        }
      };

      // Process file
      const content = await this.readFile(file);
      const hash = CryptoJS.MD5(content).toString();

      // Update state
      this.hash = hash;
      this.history.unshift({
        input: file.name,
        hash: hash,
        timestamp: new Date().toISOString()
      });

      // Limit history size
      if (this.history.length > 10) {
        this.history.pop();
      }

      this.progress = 100;
    } catch (err) {
      console.error('File processing failed:', err);
      throw err;
    } finally {
      this.isProcessing = false;
    }
  }

  // Helper methods
  private readFile(file: File): Promise<string> {
    return new Promise((resolve, reject) => {
      const reader = new FileReader();
      reader.onload = () => resolve(reader.result as string);
      reader.onerror = reject;
      reader.readAsText(file);
    });
  }
}

III. Development Experience

3.1 Problems Encountered

Library Integration
- Problem: crypto-js compatibility
- Solution: Used proper version
File Processing
- Problem: Large file handling
- Solution: Implemented chunking
Performance Issues
- Problem: Processing speed
- Solution: Optimized algorithms
User Experience
- Problem: Progress feedback
- Solution: Added progress bar

3.2 Optimization Suggestions

Feature Optimization
- Add more hash types
- Support batch processing
- Add hash comparison
- Support more formats
Performance Optimization
- Optimize file reading
- Improve chunking
- Cache results
- Reduce memory usage
User Experience
- Add drag and drop
- Support batch files
- Add hash verification
- Improve feedback
Security
- Add input validation
- Implement rate limiting
- Add error handling
- Improve logging

IV. Summary

This MD5 tool has all the basic features and can:

Calculate MD5 hashes
Process text and files
Show calculation history
Compare hash values

V. Reference Resources

Welcome to Experience

This MD5 tool has been integrated into the HarmonyOS Developer Toolbox. Welcome to download and experience it!

HarmonyOS Developer Toolbox

Author: In the World of Development
Email: 1743914721@qq.com
Copyright Notice: This article is an original work by the CSDN blogger, please include the original source link and this statement when reprinting.