SM4 Encryption Decryption Tool
Chinese National Standard Block Cipher Algorithm
Professional SM4 encryption and decryption tool supporting all standard modes (ECB, CBC, CFB, OFB, CTR, GCM). Secure, fast, and compliant with Chinese national cryptographic standards.
Encryption Configuration
Key and IV Configuration
Input Data
Output Result
When to Use SM4 Encryption Tool
WAPI Wireless Security
Implement SM4 encryption for WAPI (WLAN Authentication and Privacy Infrastructure) compliance in Chinese wireless network deployments and IoT devices.
Financial Transactions
Secure electronic payment systems, banking applications, and financial data transmission using Chinese national standard encryption algorithms.
Government Communications
Secure sensitive government data, official communications, and confidential documents using nationally approved cryptographic standards.
Enterprise Data Protection
Protect sensitive business data, intellectual property, and confidential information in compliance with Chinese data security regulations.
Cloud Computing Security
Implement SM4 encryption for cloud storage, data transmission, and processing in Chinese cloud computing environments and SaaS platforms.
Mobile App Security
Secure mobile applications, user data, and communication channels using SM4 encryption for compliance with Chinese mobile security standards.
Frequently Asked Questions
What is SM4 encryption algorithm?
SM4 is a Chinese national standard 128-bit block cipher algorithm (GB/T 32907-2016) designed for secure data encryption. It uses 128-bit keys and blocks, originally created for WAPI wireless network security and is now widely used in various cryptographic applications including TLS, mobile payments, and IoT devices.
How do I use the SM4 encryption tool?
Enter your text or data in the input field, provide a 128-bit encryption key (32 hexadecimal characters), select your preferred encryption mode (ECB, CBC, etc.), choose input/output formats, and click encrypt or decrypt. The tool handles all technical details automatically and provides instant results.
Is this SM4 tool free to use?
Yes, our SM4 encryption and decryption tool is completely free to use. There are no registration requirements, usage limits, or hidden fees. All processing is done securely in your browser without sending data to external servers.
What encryption modes are supported?
The tool supports all standard SM4 encryption modes: ECB (Electronic Codebook), CBC (Cipher Block Chaining), CFB (Cipher Feedback), OFB (Output Feedback), CTR (Counter Mode), and GCM (Galois Counter Mode). Each mode offers different security properties for various use cases.
Is my data secure when using this tool?
Yes, all encryption and decryption operations are performed locally in your browser using JavaScript. Your data never leaves your device or gets transmitted to external servers, ensuring complete privacy and security. The tool implements proper cryptographic practices and secure key handling.
Can I download the encrypted results?
Yes, you can download the encrypted or decrypted results as text files for later use. The tool also supports copying results to clipboard for easy integration with other applications. Multiple output formats are available including hexadecimal, Base64, and plain text.
What input formats are accepted?
The tool accepts plain text, hexadecimal, and Base64 formats for both input and output. Encryption keys must be provided in hexadecimal format (32 characters for 128-bit keys). The tool automatically handles format conversions and validates input data.
Why is SM4 important for Chinese applications?
SM4 is mandated for certain applications within China and is essential for compliance with Chinese data security regulations. It's required for WAPI wireless networks, government communications, financial systems, and many enterprise applications operating in China.
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