Developer Reference

Contents

mbx_sm4_encrypt/decrypt_cfb128_mb16

Encryption/decryption of the input data streams by using the SM4 algorithm in the CFB mode with 128-bit CFB block size.

Syntax

mbx_status16 mbx_sm4_encrypt_cfb128_mb16(int8u*
pa_out
[SM4_LINES], const int8u*
pa_inp
[SM4_LINES], const int
len
[SM4_LINES], const mbx_sm4_key_schedule*
key_sched
, const int8u*
pa_iv
[SM4_LINES]);
mbx_status16 mbx_sm4_decrypt_cfb128_mb16(int8u*
pa_out
[SM4_LINES], const int8u*
pa_inp
[SM4_LINES], const int
len
[SM4_LINES], const mbx_sm4_key_schedule*
key_sched
, const int8u*
pa_iv
[SM4_LINES]);
Include Files
crypto_mb/sm4.h
Parameters
pa_out
Array of pointers to the output data streams.
pa_inp
Array of pointers to the input data streams.
len
Array of lengths of the input data in bytes.
key_sched
Pointer to key schedule.
pa_iv
Array of pointers to the 128-bit initialization vectors for the CFB mode operation.
Description
These functions encrypt/decrypt the input data streams passed by
pa_inp
of a variable length passed through
len
array according to the CFB cipher scheme with 128-but CFB block size
pa_iv
. The results are stored into the memory buffers specified in
pa_out
parameter.
Return Values
The
mbx_sm4_encrypt/decrypt_cfb128_mb16()
function returns the status that indicates whether the operation completed successfully or not. The status value of 0 indicates that data streams were successfully encrypted/decrypted. In case of non-zero status value,
MBX_GET_HIGH_PART_STS16()
and
MBX_GET_LOW_PART_STS16()
can help to get the low and high parts of the mbx_status16, which can be analyzed separately with
MBX_GET_STS()
call. The low part includes first eight statuses, while the high part includes remaining 8 statuses for each operation.

Product and Performance Information

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Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.