SM2 key encrypts data, what is the requirement for the length of plaintext data

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The ciphertext of sm2 is derived according to certain rules, and then is different or different from the plaintext. Therefore, there is no requirement for plaintext length, as long as possible, but try not to use SM2 to add and decrypt secret length data. SM2 is only used for signature, signature verification, and symmetric key negotiation. If you want to add and decrypt secret length data, sm4 symmetric encryption and decryption is more appropriate.

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