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MySensors Library & Examples
2.3.2
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MySensors Library & Examples
2.3.2
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Collaboration diagram for MySigning:API declaration for MySigning signing backend.
Files | |
| file | MySigning.h |
| API declaration for MySigning signing backend. | |
| file | SecureActuator.ino |
| Example sketch showing how to securely control locks. | |
| file | SecurityPersonalizer.ino |
| Security personalization sketch. | |
Macros | |
| #define | NUM_OF(x) (sizeof(x)/sizeof(x[0])) |
| Helper macro to determine the number of elements in a array. | |
Functions | |
| void | signerInit (void) |
| Initializes signing infrastructure and associated backend. More... | |
| void | signerPresentation (MyMessage &msg, uint8_t destination) |
| Does signing specific presentation for a node. More... | |
| bool | signerProcessInternal (MyMessage &msg) |
| Manages internal signing message handshaking. More... | |
| bool | signerCheckTimer (void) |
| Check timeout of verification session. More... | |
| bool | signerPutNonce (MyMessage &msg) |
| Get nonce from provided message and store for signing operations. More... | |
| bool | signerSignMsg (MyMessage &msg) |
| Signs provided message. All remaining space in message payload buffer is used for signing identifier and signature. More... | |
| bool | signerVerifyMsg (MyMessage &msg) |
| Verifies signature in provided message. More... | |
| int | signerMemcmp (const void *a, const void *b, size_t sz) |
| Do a timing neutral memory comparison. More... | |
| bool signerCheckTimer | ( | void | ) |
Check timeout of verification session.
Nonce will be purged if it takes too long for a signed message to be sent to the receiver.
Usage: This function should be called on regular intervals, typically within some process loop.
true if session is still valid. | void signerInit | ( | void | ) |
Initializes signing infrastructure and associated backend.
This function makes sure that the internal states of the signing infrastructure is set to a known initial state.
Usage: This function should be called before any signing related operations take place.
| int signerMemcmp | ( | const void * | a, |
| const void * | b, | ||
| size_t | sz | ||
| ) |
Do a timing neutral memory comparison.
The function behaves similar to memcmp with the difference that it will always use the same number of instructions for a given number of bytes, no matter how the two buffers differ and the response is either 0 or -1.
| a | First buffer for comparison. |
| b | Second buffer for comparison. |
| sz | The number of bytes to compare. |
| void signerPresentation | ( | MyMessage & | msg, |
| uint8_t | destination | ||
| ) |
Does signing specific presentation for a node.
This function makes sure any signing related presentation info is shared with the other part. The presentation of the gateways signing preferences is done in signerProcessInternal().
Usage: This function should be called by the presentation routine of the MySensors library. You only need to call this directly from a sketch to set up a node to node signed message exchange. If you do call this directly from a sketch, and you at some point change your sketch to go from requiring signing to not requiring signatures, you need to present this change to the node at least once, so it can update its requirements tables accordingly. Or it will keep believing that this node require signatures and attempt to send signed messages to it.
| msg | Message buffer to use. |
| destination | Node ID of the destination. |
| bool signerProcessInternal | ( | MyMessage & | msg | ) |
Manages internal signing message handshaking.
This function takes care of signing related message handshaking such as nonce exchange.
Usage: This function should be called by the incoming message handler before any further message processing is performed on internal messages. This function should only be called for C_INTERNAL class messages.
| msg | Message buffer to process. |
true if caller should stop further message processing. | bool signerPutNonce | ( | MyMessage & | msg | ) |
Get nonce from provided message and store for signing operations.
Returns false if subsystem is busy processing an ongoing signing operation.
Returns false if signing identifier found in message is not supported by the used backend.
If successful, this marks the start of a signing operation at the sending side so implementation is expected to do any necessary initializations within this call.
Usage: This function is typically called as action when receiving a I_NONCE_RESPONSE message.
| msg | The message to get the nonce from. |
true if successful, else false. | bool signerSignMsg | ( | MyMessage & | msg | ) |
Signs provided message. All remaining space in message payload buffer is used for signing identifier and signature.
Nonce used for signature calculation is the one generated previously within signerProcessInternal().
Nonce will be cleared when this function is called to prevent re-use of nonce.
Returns false if subsystem is busy processing an ongoing signing operation.
Returns false if not two bytes or more of free payload space is left in provided message.
This ends a signing operation at the sending side so implementation is expected to do any deinitializations and enter a power saving state within this call.
Usage: This function is typically called as action when receiving a I_NONCE_RESPONSE message and after signerPutNonce() has successfully been executed.
| msg | The message to sign. |
true if successful, else false. | bool signerVerifyMsg | ( | MyMessage & | msg | ) |
Verifies signature in provided message.
Nonce used for verification is the one previously set using signerPutNonce().
Nonce will be cleared when this function is called to prevent re-use of nonce.
Returns false if subsystem is busy processing an ongoing signing operation.
Returns false if signing identifier found in message is not supported by the used backend.
This ends a signing operation at the receiving side so implementation is expected to do any deinitializations and enter a power saving state within this call.
Usage: This function is typically called when receiving a message that is flagged as signed and MY_SIGNING_REQUEST_SIGNATURES is activated.
| msg | The message to verify. |
true if successful, else false.