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- #include <stdint.h>
- #include "optiga/dtls/DtlsWindowing.h"
- #include "optiga/dtls/DtlsRecordLayer.h"
- #ifdef MODULE_ENABLE_DTLS_MUTUAL_AUTH
- #define MAX_WINDOW_SIZE 64
- int32_t DtlsCheckReplay(sWindow_d *PpsWindow)
- {
- int32_t i4Status = (int32_t) OCP_RL_WINDOW_IGNORE;
- int32_t i4Retval;
- sUint64 sIntermidateVal;
- do
- {
- #ifdef ENABLE_NULL_CHECKS
- if((NULL == PpsWindow) || (NULL == PpsWindow->fValidateRecord))
- {
- break;
- }
- #endif
- if((MAX_WINDOW_SIZE < PpsWindow->bWindowSize) || (WORD_SIZE > PpsWindow->bWindowSize))
- {
- break;
- }
-
- i4Retval = CompareUint64(&PpsWindow->sRecvSeqNumber, &PpsWindow->sLowerBound);
-
- if(LESSER_THAN == i4Retval)
- {
- break;
- }
-
-
- i4Retval = CompareUint64(&PpsWindow->sRecvSeqNumber, &PpsWindow->sHigherBound);
-
-
- if(GREATER_THAN == i4Retval)
- {
-
- i4Retval = PpsWindow->fValidateRecord(PpsWindow->pValidateArgs);
-
- if(OCP_RL_OK != i4Retval)
- {
- if(((int32_t)CMD_LIB_DECRYPT_FAILURE == i4Retval) || ((int32_t)OCP_RL_MALLOC_FAILURE == i4Retval))
- {
- i4Status = i4Retval;
- }
- break;
- }
- else
- {
-
-
-
- i4Retval = SubtractUint64(&PpsWindow->sRecvSeqNumber, &PpsWindow->sHigherBound, &sIntermidateVal);
-
- i4Retval = ShiftLeftUint64(&PpsWindow->sWindowFrame, sIntermidateVal, PpsWindow->bWindowSize, (uint8_t)MAX_WINDOW_SIZE);
- if(UTIL_SUCCESS != i4Retval)
- {
- break;
- }
-
- PpsWindow->sHigherBound = PpsWindow->sRecvSeqNumber;
- sIntermidateVal.dwHigherByte = DEFAULT_LOWBOUND_DOUBLEWORD ;
- sIntermidateVal.dwLowerByte = (uint32_t)PpsWindow->bWindowSize - 1;
-
- i4Retval = SubtractUint64(&PpsWindow->sHigherBound, &sIntermidateVal, &PpsWindow->sLowerBound);
- if(UTIL_SUCCESS != i4Retval)
- {
- break;
- }
-
- i4Retval = Utility_SetBitUint64(&PpsWindow->sWindowFrame, PpsWindow->bWindowSize, PpsWindow->bWindowSize);
- if(UTIL_SUCCESS != i4Retval)
- {
- break;
- }
- i4Status = (int32_t) OCP_RL_WINDOW_MOVED;
- break;
- }
- }
-
-
-
-
- i4Retval = SubtractUint64(&PpsWindow->sHigherBound, &PpsWindow->sRecvSeqNumber, &sIntermidateVal);
-
- if(WORD_SIZE == PpsWindow->bWindowSize)
- {
- if((MOST_SIGNIFICANT_BIT_HIGH == ((PpsWindow->sWindowFrame.dwHigherByte << (uint32_t)((WORD_SIZE - sIntermidateVal.dwLowerByte) - 1))
- & MOST_SIGNIFICANT_BIT_HIGH)))
- {
- break;
- }
- }
- else
- {
-
- if((DEFAULT_LOWBOUND_DOUBLEWORD == sIntermidateVal.dwHigherByte) && (sIntermidateVal.dwLowerByte < WORD_SIZE))
- {
- if((MOST_SIGNIFICANT_BIT_HIGH == ((PpsWindow->sWindowFrame.dwLowerByte << (uint32_t)((WORD_SIZE - sIntermidateVal.dwLowerByte) - 1 )) & MOST_SIGNIFICANT_BIT_HIGH)))
- {
- break;
- }
- }
-
- else if((DEFAULT_LOWBOUND_DOUBLEWORD == sIntermidateVal.dwHigherByte) && (sIntermidateVal.dwLowerByte >= WORD_SIZE))
- {
- if((MOST_SIGNIFICANT_BIT_HIGH == ((PpsWindow->sWindowFrame.dwHigherByte << (uint32_t)((MAX_WINDOW_SIZE - sIntermidateVal.dwLowerByte) - 1)) & MOST_SIGNIFICANT_BIT_HIGH)))
- {
- break;
- }
- }
- }
-
- i4Retval = PpsWindow->fValidateRecord(PpsWindow->pValidateArgs);
-
- if(OCP_RL_OK != i4Retval)
- {
- if(((int32_t)CMD_LIB_DECRYPT_FAILURE == i4Retval) || ((int32_t)OCP_RL_MALLOC_FAILURE == i4Retval))
- {
- i4Status = i4Retval;
- }
- break;
- }
- else
- {
- i4Retval = SubtractUint64(&PpsWindow->sRecvSeqNumber, &PpsWindow->sLowerBound,&sIntermidateVal);
- if(UTIL_SUCCESS != i4Retval)
- {
- break;
- }
-
- i4Retval = Utility_SetBitUint64(&PpsWindow->sWindowFrame, PpsWindow->bWindowSize, (uint8_t)sIntermidateVal.dwLowerByte);
- if(UTIL_SUCCESS != i4Retval)
- {
- break;
- }
- if(PpsWindow->bWindowSize > WORD_SIZE)
- {
- PpsWindow->sWindowFrame.dwHigherByte &= MASK_DOUBLE_WORD >> (MAX_WINDOW_SIZE - PpsWindow->bWindowSize);
- }
- i4Status = (int32_t)OCP_RL_WINDOW_UPDATED;
- }
- }while(0);
- return i4Status;
- }
- #endif
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