mbx_sm4_gcm_init_context_mb16¶
Initializes context by setting up all the necessary key material for both encryption and decryption operations, initializes the hash keys, and processes initialization vector (IV).
Syntax¶
mbx_status16 mbx_sm4_gcm_init_context_mb16(const sm4_key* pa_key[SM4_LINES], const int8u* pa_iv[SM4_LINES], const int iv_len[SM4_LINES], SM4_GCM_CTX_mb16* p_context);
Include Files¶
crypto_mb/sm4_gcm.h
Parameters¶
pa_key |
Array of pointers to the SM4 secret keys. |
pa_iv |
Array of pointers to the initialization vectors. |
iv_len |
Array of lengths of the initialization vectors in bytes. |
p_context |
Pointer to the context to keep intermediate results between calls. |
Description¶
Sets up a key schedule using user-supplied secret keys passed through pa_key with all necessary key material for both encryption and decryption operations.
Processes the initialization vector streams passed by pa_iv of a variable length passed through iv_len array according to the GCM cipher scheme and updates context with processing result.
Return Values¶
The mbx_sm4_gcm_init_context_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
the 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.