psa_sign_hash_start() function

#PSA_SUCCESS The operation started successfully - call \c psa_sign_hash_complete() with the same context to complete the operation #PSA_ERROR_INVALID_HANDLE \emptydescription #PSA_ERROR_NOT_PERMITTED The key does not have the #PSA_KEY_USAGE_SIGN_HASH flag, or it does not permit the requested algorithm. #PSA_ERROR_BAD_STATE An operation has previously been started on this context, and is still in progress. #PSA_ERROR_NOT_SUPPORTED \emptydescription #PSA_ERROR_INVALID_ARGUMENT \emptydescription #PSA_ERROR_INSUFFICIENT_MEMORY \emptydescription #PSA_ERROR_COMMUNICATION_FAILURE \emptydescription #PSA_ERROR_HARDWARE_FAILURE \emptydescription #PSA_ERROR_CORRUPTION_DETECTED \emptydescription #PSA_ERROR_STORAGE_FAILURE \emptydescription #PSA_ERROR_DATA_CORRUPT \emptydescription #PSA_ERROR_DATA_INVALID \emptydescription #PSA_ERROR_INSUFFICIENT_ENTROPY \emptydescription #PSA_ERROR_BAD_STATE 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.

This function combined with \c psa_sign_hash_complete() is equivalent to \c psa_sign_hash() but \c psa_sign_hash_complete() can return early and resume according to the limit set with \c psa_interruptible_set_max_ops() to reduce the maximum time spent in a function call. Users should call \c psa_sign_hash_complete() repeatedly on the same context after a successful call to this function until \c psa_sign_hash_complete() either returns 0 or an error. \c psa_sign_hash_complete() will return #PSA_OPERATION_INCOMPLETE if there is more work to do. Alternatively users can call \c psa_sign_hash_abort() at any point if they no longer want the result. If this function returns an error status, the operation enters an error state and must be aborted by calling \c psa_sign_hash_abort().