mbx_sm4_encrypt/decrypt_ofb_mb16
mbx_sm4_encrypt/decrypt_ofb_mb16
Encryption/decryption of the input data streams by using the SM4 algorithm in the OFB mode.
Syntax
mbx_status16 mbx_sm4_encrypt_ofb_mb16(int8u*
pa_out
[SM4_LINES], const int8u*
pa_inp
[SM4_LINES], const int
len
[SM4_LINES], const mbx_sm4_key_schedule*
key_sched
, int8u*
pa_iv
[SM4_LINES]);
mbx_status16 mbx_sm4_decrypt_ofb_mb16(int8u*
pa_out
[SM4_LINES], const int8u*
pa_inp
[SM4_LINES], const int
len
[SM4_LINES], const mbx_sm4_key_schedule*
key_sched
, 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 initialization vectors for the OFB 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 OFB cipher scheme. The results are stored into the memory buffers specified in pa_out
parameter.Return Values
The
mbx_sm4_encrypt/decrypt_ofb_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.