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armsrc/sam_common.c: fix sam_append_asn1_node

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Jakub Kramarz 2025-01-05 20:42:32 +01:00
commit 472d2e9330
2 changed files with 27 additions and 24 deletions
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49
armsrc/sam_common.c
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@ -327,31 +327,34 @@ uint8_t * sam_find_asn1_node(uint8_t * root, const uint8_t type){
return NULL;
}
// /**
// * @brief Appends an ASN.1 node to the end of a given node.
// *
// * This function appends an ASN.1 node of a specified type and length to the end of
// * the ASN.1 structure at specified node level.
// * It would make the code cleaner, but I can't get it to work - it calculates fields lengths incorrectly.
// *
// * @param root Pointer to the root node of the ASN.1 structure.
// * @param root Pointer to the node to be appended of the ASN.1 structure.
// * @param type The type of the ASN.1 node to append.
// * @param data Pointer to the data to be appended.
// * @param len The length of the data to be appended.
// */
// void sam_append_asn1_node(uint8_t * root, uint8_t * node, uint8_t type, uint8_t * data, uint8_t len){
// uint8_t * end = root + *(root+1);
/**
* @brief Appends an ASN.1 node to the end of a given node.
*
* This function appends an ASN.1 node of a specified type and length to the end of
* the ASN.1 structure at specified node level.
*
* It is the most naive solution that does not handle the case where the node to append is
* not the last node at the same level. It also does not also care about proper
* order of the nodes.
*
* @param root Pointer to the root node of the ASN.1 structure.
* @param root Pointer to the node to be appended of the ASN.1 structure.
* @param type The type of the ASN.1 node to append.
* @param data Pointer to the data to be appended.
* @param len The length of the data to be appended.
*/
void sam_append_asn1_node(uint8_t * root, uint8_t * node, uint8_t type, uint8_t * data, uint8_t len){
uint8_t * end = root + *(root+1) + 2;
// *(end) = type;
// *(end+1) = len;
// memcpy(end+2, data, len);
*(end) = type;
*(end+1) = len;
memcpy(end+2, data, len);
// for(uint8_t * current = root; current < node; current += 2){
// *(current+1) += 2 + len;
// };
// return;
// }
for(uint8_t * current = root; current <= node; current += 2){
*(current+1) += 2 + len;
};
return;
}
void sam_send_ack(void){
uint8_t * response = BigBuf_malloc(ISO7816_MAX_FRAME);