SM4 Encrypt/Decrypt

Encrypt and decrypt data using SM4 — Chinese national standard block cipher (GB/T 32907)

How to Use SM4 Encrypt/Decrypt

1. Enter or generate a 128-bit key (16 bytes) in hexadecimal format
2. Select the encryption mode — ECB (simpler, less secure) or CBC (recommended, requires IV). For CBC mode, enter or generate a 128-bit IV (16 bytes)
3. Choose Encrypt or Decrypt, enter your data, select the output format, and click the action button

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