Andrew Boyson / crypto

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

Dependents:   oldheating gps motorhome heating

tls/tls-connection.c@6:819c17738dc2, 2019-09-01 (annotated)

Committer:
andrewboyson
Date:
Sun Sep 01 18:15:12 2019 +0000
Revision:
6:819c17738dc2
Parent:
5:ee5489ee1117
Child:
8:5e66a6b4b38c
Making progress - now have decryption working.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
andrewboyson 5:ee5489ee1117 1 #include <stdlib.h>
andrewboyson 5:ee5489ee1117 2
andrewboyson 5:ee5489ee1117 3 #include "tls-connection.h"
andrewboyson 5:ee5489ee1117 4 #include "mstimer.h"
andrewboyson 5:ee5489ee1117 5
andrewboyson 5:ee5489ee1117 6 #define MAX_CONNECTIONS 4
andrewboyson 5:ee5489ee1117 7
andrewboyson 5:ee5489ee1117 8 static struct TlsConnection connections[MAX_CONNECTIONS];
andrewboyson 5:ee5489ee1117 9
andrewboyson 5:ee5489ee1117 10 static void zeroConnection(struct TlsConnection* p)
andrewboyson 5:ee5489ee1117 11 {
andrewboyson 5:ee5489ee1117 12 p->id = 0;
andrewboyson 5:ee5489ee1117 13 p->lastUsed = 0;
andrewboyson 5:ee5489ee1117 14 p->toDo = 0;
andrewboyson 5:ee5489ee1117 15 p->session = 0;
andrewboyson 5:ee5489ee1117 16 Sha256Start(&p->handshakeHash); //This just clears any information previously calculated
andrewboyson 6:819c17738dc2 17 p->clientEncrypted = false;
andrewboyson 6:819c17738dc2 18 p->serverEncrypted = false;
andrewboyson 6:819c17738dc2 19 for (int i = 0; i < TLS_RANDOM_SIZE; i++) p->clientRandom[i] = 0;
andrewboyson 6:819c17738dc2 20 for (int i = 0; i < TLS_RANDOM_SIZE; i++) p->serverRandom[i] = 0;
andrewboyson 6:819c17738dc2 21 for (int i = 0; i < TLS_VERIFY_SIZE; i++) p->clientVerify[i] = 0;
andrewboyson 5:ee5489ee1117 22 }
andrewboyson 5:ee5489ee1117 23
andrewboyson 5:ee5489ee1117 24 struct TlsConnection* TlsConnectionNew(int connectionId) //Never fails so never returns NULL
andrewboyson 5:ee5489ee1117 25 {
andrewboyson 5:ee5489ee1117 26 struct TlsConnection* p;
andrewboyson 5:ee5489ee1117 27
andrewboyson 5:ee5489ee1117 28 //Look for an existing connection
andrewboyson 5:ee5489ee1117 29 for (p = connections; p < connections + MAX_CONNECTIONS; p++)
andrewboyson 5:ee5489ee1117 30 {
andrewboyson 5:ee5489ee1117 31 if (p->id == connectionId) goto end;
andrewboyson 5:ee5489ee1117 32 }
andrewboyson 5:ee5489ee1117 33
andrewboyson 5:ee5489ee1117 34 //look for an empty connection
andrewboyson 5:ee5489ee1117 35 {
andrewboyson 5:ee5489ee1117 36 struct TlsConnection* pOldest = 0;
andrewboyson 5:ee5489ee1117 37 uint32_t ageOldest = 0;
andrewboyson 5:ee5489ee1117 38 for (p = connections; p < connections + MAX_CONNECTIONS; p++)
andrewboyson 5:ee5489ee1117 39 {
andrewboyson 5:ee5489ee1117 40 if (!p->id) goto end;
andrewboyson 5:ee5489ee1117 41
andrewboyson 5:ee5489ee1117 42 //Otherwise record the oldest and keep going
andrewboyson 5:ee5489ee1117 43 uint32_t age = MsTimerCount - p->lastUsed;
andrewboyson 5:ee5489ee1117 44 if (age >= ageOldest)
andrewboyson 5:ee5489ee1117 45 {
andrewboyson 5:ee5489ee1117 46 ageOldest = age;
andrewboyson 5:ee5489ee1117 47 pOldest = p;
andrewboyson 5:ee5489ee1117 48 }
andrewboyson 5:ee5489ee1117 49 }
andrewboyson 5:ee5489ee1117 50
andrewboyson 5:ee5489ee1117 51 //No empty ones found so use the oldest
andrewboyson 5:ee5489ee1117 52 p = pOldest;
andrewboyson 5:ee5489ee1117 53 }
andrewboyson 5:ee5489ee1117 54
andrewboyson 5:ee5489ee1117 55 end:
andrewboyson 5:ee5489ee1117 56 zeroConnection(p);
andrewboyson 5:ee5489ee1117 57 p->id = connectionId;
andrewboyson 5:ee5489ee1117 58 p->lastUsed = MsTimerCount;
andrewboyson 5:ee5489ee1117 59 return p;
andrewboyson 5:ee5489ee1117 60 }
andrewboyson 5:ee5489ee1117 61 struct TlsConnection* TlsConnectionOrNull(int connectionId)
andrewboyson 5:ee5489ee1117 62 {
andrewboyson 5:ee5489ee1117 63 for (struct TlsConnection* p = connections; p < connections + MAX_CONNECTIONS; p++)
andrewboyson 5:ee5489ee1117 64 {
andrewboyson 5:ee5489ee1117 65 if (p->id == connectionId)
andrewboyson 5:ee5489ee1117 66 {
andrewboyson 5:ee5489ee1117 67 p->lastUsed = MsTimerCount;
andrewboyson 5:ee5489ee1117 68 return p;
andrewboyson 5:ee5489ee1117 69 }
andrewboyson 5:ee5489ee1117 70 }
andrewboyson 5:ee5489ee1117 71 return NULL;
andrewboyson 5:ee5489ee1117 72 }
andrewboyson 5:ee5489ee1117 73 void TlsConnectionReset(int connectionId)
andrewboyson 5:ee5489ee1117 74 {
andrewboyson 5:ee5489ee1117 75 for (struct TlsConnection* p = connections; p < connections + MAX_CONNECTIONS; p++)
andrewboyson 5:ee5489ee1117 76 {
andrewboyson 5:ee5489ee1117 77 if (p->id == connectionId) zeroConnection(p);
andrewboyson 5:ee5489ee1117 78 }
andrewboyson 5:ee5489ee1117 79 }