mbx_sm4_gcm_update_aad_mb16¶
Processes additional authenticated data (AAD).
Syntax¶
mbx_status16 mbx_sm4_gcm_update_aad_mb16(const int8u* pa_aad[SM4_LINES], const int aad_len[SM4_LINES], SM4_GCM_CTX_mb16* p_context);
Include Files¶
crypto_mb/sm4_gcm.h
Parameters¶
pa_aad |
Array of pointers to the additional authenticated data. |
aad_len |
Array of lengths of the additional authenticated data in bytes. |
p_context |
Pointer to the context to keep intermediate results between calls. |
Description¶
Processes the additional authenticated data streams passed by pa_aad of a variable length passed through the aad_len array
according to the GCM cipher scheme and updates context with the intermediate hash value.
Note
mbx_sm4_gcm_update_aad_mb16 has several call sequence restrictions. See SM4 GCM Algorithm Functions page for details.
Return Values¶
The mbx_sm4_gcm_update_aad_mb16() function returns the status that indicates whether the operation is completed successfully or not.
The status value of 0 indicates that the key schedule is successfully initialized.
In case of a 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 mbx_status16,
which can be analyzed separately with the MBX_GET_STS() call.
The low part includes the first eight statuses, while the high part includes the remaining eight statuses for each operation.