Function psa_asymmetric_decrypt 

pub unsafe extern "C" fn psa_asymmetric_decrypt(
    key: mbedtls_svc_key_id_t,
    alg: psa_algorithm_t,
    input: *const u8,
    input_length: usize,
    salt: *const u8,
    salt_length: usize,
    output: *mut u8,
    output_size: usize,
    output_length: *mut usize,
) -> psa_status_t

\brief Decrypt a short message with a private key.

\warning When \p alg is #PSA_ALG_RSA_PKCS1V15_CRYPT, this is an inherently dangerous function (CWE-242): unless it is used in a side channel free and safe way, the calling code is vulnerable. Specifically, callers need to ensure an adversary cannot distinguish between success, #PSA_ERROR_INVALID_PADDING and #PSA_ERROR_BUFFER_TOO_SMALL. Also, in the latter two cases, the values of the output bytes must be ignored, again without revealing whether that’s the case.

\param key Identifier of the key to use for the operation. It must be an asymmetric key pair. It must allow the usage #PSA_KEY_USAGE_DECRYPT. \param alg An asymmetric encryption algorithm that is compatible with the type of \p key. \param[in] input The message to decrypt. \param input_length Size of the \p input buffer in bytes. \param[in] salt A salt or label, if supported by the encryption algorithm. If the algorithm does not support a salt, pass \c NULL. If the algorithm supports an optional salt and you do not want to pass a salt, pass \c NULL.

                         - For #PSA_ALG_RSA_PKCS1V15_CRYPT, no salt is
                           supported.

\param salt_length Size of the \p salt buffer in bytes. If \p salt is \c NULL, pass 0. \param[out] output Buffer where the decrypted message is to be written. \param output_size Size of the \c output buffer in bytes. \param[out] output_length On success, the number of bytes that make up the returned output.

\retval #PSA_SUCCESS \emptydescription \retval #PSA_ERROR_INVALID_HANDLE \emptydescription \retval #PSA_ERROR_NOT_PERMITTED \emptydescription \retval #PSA_ERROR_BUFFER_TOO_SMALL The size of the \p output buffer is too small. You can determine a sufficient buffer size by calling #PSA_ASYMMETRIC_DECRYPT_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. \retval #PSA_ERROR_NOT_SUPPORTED \emptydescription \retval #PSA_ERROR_INVALID_ARGUMENT \emptydescription \retval #PSA_ERROR_INSUFFICIENT_MEMORY \emptydescription \retval #PSA_ERROR_COMMUNICATION_FAILURE \emptydescription \retval #PSA_ERROR_HARDWARE_FAILURE \emptydescription \retval #PSA_ERROR_CORRUPTION_DETECTED \emptydescription \retval #PSA_ERROR_STORAGE_FAILURE \emptydescription \retval #PSA_ERROR_INSUFFICIENT_ENTROPY \emptydescription \retval #PSA_ERROR_INVALID_PADDING \emptydescription \retval #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.