mbx_sm4_gcm_encrypt/decrypt_mb16¶
Processes additional authenticated data (AAD).
Syntax¶
mbx_status16 mbx_sm4_gcm_encrypt_mb16(int8u* pa_out[SM4_LINES], const int8u* pa_in[SM4_LINES], const int in_len[SM4_LINES], SM4_GCM_CTX_mb16* p_context);
mbx_status16 mbx_sm4_gcm_decrypt_mb16(int8u* pa_out[SM4_LINES], const int8u* pa_in[SM4_LINES], const int in_len[SM4_LINES], SM4_GCM_CTX_mb16* p_context);
Include Files¶
crypto_mb/sm4_gcm.h
Parameters¶
pa_out |
Array of pointers to the output data streams. |
pa_in |
Array of pointers to the input data streams. |
in_len |
Array of lengths of the input data in bytes. |
p_context |
Pointer to the context to keep intermediate results between calls. |
Description¶
These functions encrypt/decrypt the input data streams passed by pa_in of a variable length passed through the in_len array according
to the GCM cipher scheme and store the results into the memory buffers specified in the pa_out parameter.
The functions also update the context with intermediate hash value.
Note
mbx_sm4_gcm_encrypt_mb16a and mbx_sm4_gcm_decrypt_mb16 have several call sequence restrictions. See SM4 GCM Algorithm Functions page for details.
Return Values¶
The mbx_sm4_gcm_encrypt_mb16/mbx_sm4_gcm_decrypt_mb16() functions return 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.