ssize_t kcapi_cipher_dec_sm4_ctr(const uint8_t * key, uint32_t keylen, const uint8_t * in, size_t inlen, const uint8_t * ctr, uint8_t * out, size_t outlen);
[in] key buffer
[in] length of key buffer
[in] ciphertext data buffer
[in] length of in buffer
[in] start counter value to be used for cipher operation
[out] plaintext data buffer
[in] length of out buffer
The convenience function performs an SM4 counter mode encryption operation using the provided key, the given input buffer and the given IV. The output is stored in the out buffer.
The input buffer can be of arbitrary length.
The output buffer must be at least as large as the input buffer.
The start counter can contain all zeros (not a NULL buffer!) and must be exactly 16 bytes in size.
The SM4 key is fixed 16 bytes long.
return number of bytes generated upon success; a negative errno-style error code if an error occurred
Stephan Mueller <email@example.com>