SM4 Encryption/Decryption Tool
SM4 block symmetric encryption algorithm.
Encrypt
Decrypt
CBC
ECB
PKCS7
NOPADDING
Key:
Hex
Base64
Please enter a 16-character or 32-bit hex key
0 chars
IV:
Hex
Base64
Please enter a 16-character or 32-bit hex IV
0 chars
Input
UTF-8
Hex
Base64
Waiting for input…
0 chars
Result
Base64
Hex
Result
Not executed yet
0 chars
LOCAL All operations are performed locally in the browser and no data will be uploaded.

What is SM4?

SM4 is a 128-bit symmetric block cipher published by the State Cryptography Administration of China, with security comparable to AES-128.

🎯

Core Value

  • High efficiency
  • Simple structure
  • Low resource use
  • Multiple modes
📋

Work Modes

  • ECB (Electronic Codebook)
  • CBC (Cipher Block Chaining)
  • CFB (Cipher Feedback)
  • OFB (Output Feedback)
  • CTR (Counter Mode)
🚀

Scenarios

  • WAPI Security
  • Disk/File encryption
  • Database encryption
  • Real-time data security
💎

Technical Features

  • 32-round iteration
  • Equivalent decryption
  • PKCS7 etc. support
  • High throughput

🚀 How to Use

  • Config: Select mode (CBC recommended) and padding, then enter a 16-byte key.
  • Run: Switch between 'Encrypt' and 'Decrypt', enter text to get results.
  • Key: Use 'Random' to generate a strong encryption key.

💡 FAQ

SM4 or AES?
Both are secure. SM4 is preferred for compliance with Chinese national standards and government requirements.
Why did decryption fail?
Ensure the key, mode, padding, and IV match exactly with those used for encryption.

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