psa_sign_message() function

#PSA_SUCCESS \emptydescription #PSA_ERROR_INVALID_HANDLE \emptydescription #PSA_ERROR_NOT_PERMITTED The key does not have the #PSA_KEY_USAGE_SIGN_MESSAGE flag, or it does not permit the requested algorithm. #PSA_ERROR_BUFFER_TOO_SMALL The size of the \p signature buffer is too small. You can determine a sufficient buffer size by calling #PSA_SIGN_OUTPUT_SIZE(\c key_type, \c key_bits, \p alg) where \c key_type and \c key_bits are the type and bit-size respectively of \p key. #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.

To perform a multi-part hash-and-sign signature algorithm, first use a multi-part hash operation and then pass the resulting hash to psa_sign_hash(). PSA_ALG_SIGN_GET_HASH(\p alg) can be used to determine the hash algorithm to use.