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SM4 Encrypt / Decrypt

SM4 Encrypt / Decrypt, processed in your browser with copy and download.

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LOCAL · PRIVATE · TOOLS

SM4 Encrypt / Decrypt

Processing stays in this browser. Your input is not uploaded.

Runs in a browser Worker. Example keys/IVs are for testing; random keys can be generated. ECB/CBC and other unauthenticated modes do not verify integrity. CFB uses full-block feedback; CTR a full big-endian counter. CTS is CBC-CS3 and requires no padding. Zeros cannot preserve trailing zero bytes.

108 / 100,000

Processed content stays in this page’s memory and cannot be recovered after clearing or closing.

About this tool

SM4 Encrypt / Decrypt, processed in your browser with copy and download. Runs in a browser Worker. Example keys/IVs are for testing; random keys can be generated. ECB/CBC and other unauthenticated modes do not verify integrity. CFB uses full-block feedback; CTR a full big-endian counter. CTS is CBC-CS3 and requires no padding. Zeros cannot preserve trailing zero bytes. Input and output are not uploaded. Metrics contain only status, duration, count and copy/download actions.

How to use

  1. Load the example or enter input and select an operation.
  2. Run the tool; cancel at any time.
  3. Review, copy or download the TXT result. Editing clears old output.

Frequently asked questions

What happens to invalid input?

Invalid formats, out-of-range numbers and oversized outputs are rejected. Follow the example; inputs are not silently repaired.

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