Interruptible sign/verify hash

Functions
psa_status_t	psa_hash_resume (psa_hash_operation_t *operation, const uint8_t *hash_state, size_t hash_state_length)
	Resume a previously suspended hash operation. More...
psa_status_t	psa_hash_suspend (psa_hash_operation_t *operation, uint8_t *hash_state, size_t hash_state_size, size_t *hash_state_length)
	Suspend an active hash operation. More...

Detailed Description

Function Documentation

psa_hash_resume()

psa_status_t psa_hash_resume	(	psa_hash_operation_t *	operation,
		const uint8_t *	hash_state,
		size_t	hash_state_length
	)

Resume a previously suspended hash operation.

Set up a multi-part hash operation using the hash suspend state from a previously suspended hash operation.

Parameters

[in,out]	operation	The operation object to set up. It must have been initialized as per the documentation for psa_hash_operation_t and not yet in use.
[in]	hash_state	Buffer containing the suspended hash state which is to be resumed.
	hash_state_length	Length of hash_state in bytes.

Return values

#PSA_SUCCESS
#PSA_ERROR_NOT_SUPPORTED
#PSA_ERROR_BAD_STATE	The operation state is not valid: it must be inactive. The library has not been previously initialized by psa_crypto_init(). It is implementation-dependent whether a failure to initialize results in this error code.

psa_hash_suspend()

psa_status_t psa_hash_suspend	(	psa_hash_operation_t *	operation,
		uint8_t *	hash_state,
		size_t	hash_state_size,
		size_t *	hash_state_length
	)

Suspend an active hash operation.

Halt the hash operation and extract the intermediate state of the hash computation.

Parameters

[in]	operation	Active hash operation.
[out]	hash_state	Buffer where the hash suspend state is to be written.
	hash_state_size	Size of the hash_state buffer in bytes. This must be appropriate for the selected algorithm.
[out]	hash_state_length	On success, the number of bytes that make up the hash suspend state.

Return values

#PSA_SUCCESS	Success. The first (*hash_state_length) bytes of hash_state contain the intermediate hash state.
#PSA_ERROR_NOT_SUPPORTED
#PSA_ERROR_BUFFER_TOO_SMALL	The size of the hash_state buffer is too small. You can determine a sufficient buffer size by calling #PSA_HASH_SUSPEND_OUTPUT_SIZE(alg) where alg is the algorithm that was used to set up the operation.
#PSA_ERROR_BAD_STATE	The operation state is not valid: it must be active. The library has not been previously initialized by psa_crypto_init(). It is implementation-dependent whether a failure to initialize results in this error code.