Ejemplos de AESCFBEncrypt en C++ (Cpp)

Ejemplo n.º 1

Archivo: snmpv3_usm.c Proyecto: dakkanner/cst-417-lab

uint8_t SNMPv3AESEncryptResponseScopedPdu(SNMPV3_RESPONSE_WHOLEMSG* plain_text/*uint8_t userDBIndex*/)
{

uint8_t* cryptoKey;
uint8_t* initVector;
uint8_t* plainText;
uint16_t plaintextLen;
uint8_t* encrypted_text;
uint8_t extraMemReqd;
AES_ROUND_KEYS_128_BIT round_keys;
AES_CFB_STATE_DATA current_stream;

SNMPV3_PROCESSING_MEM_INFO_PTRS snmpv3PktProcessingMemPntr; 
SNMPV3_STACK_DCPT_STUB * snmpv3EngnDcptMemoryStubPtr=0;		
				
	SNMPv3GetPktProcessingDynMemStubPtrs(&snmpv3PktProcessingMemPntr);
				
	snmpv3EngnDcptMemoryStubPtr=snmpv3PktProcessingMemPntr.snmpv3StkProcessingDynMemStubPtr;
	
	//This is a secured request. Compute the AES Encryption IV 
	SNMPv3UsmAesEncryptDecrptInitVector(SNMP_RESPONSE_PDU);

	plaintextLen= (plain_text->scopedPduStructLen);
	cryptoKey=snmpv3EngnDcptMemoryStubPtr->UserInfoDataBase[snmpv3EngnDcptMemoryStubPtr->UserInfoDataBaseIndx].userPrivPswdLoclizdKey;
	initVector=snmpV3AesEncryptInitVector;
	plainText=(plain_text->scopedPduOffset);
	

	extraMemReqd=(16-(plaintextLen%16)); //AES Blocks are in multiples of 16 Bytes
	encrypted_text=(uint8_t*)(TCPIP_HEAP_Calloc(snmpv3PktProcessingMemPntr.snmpHeapMemHandler,1,(size_t)plaintextLen+extraMemReqd));

	if(encrypted_text != NULL)
	{		
		AESCreateRoundKeys (&round_keys,cryptoKey,AES_KEY_SIZE_128_BIT);

        memcpy(current_stream.initial_vector,initVector,16);

		AESCFBEncrypt(encrypted_text,plainText, plaintextLen,    
                    &round_keys, &current_stream,        
                    AES_STREAM_START | AES_USE_CFB128 );

	}
	else
		return	SNMPV3_MSG_PRIV_FAIL;

	//Copy decrypted text to already allocated WholeMsg dynamic memory Buffer.
	memcpy(plainText,encrypted_text,plaintextLen);

	//free this temp buffer used for decryption purpose.
	TCPIP_HEAP_Free(snmpv3PktProcessingMemPntr.snmpHeapMemHandler, encrypted_text);

	return SNMPV3_MSG_PRIV_PASS;
}

Ejemplo n.º 2

Archivo: SNMPv3USM.c Proyecto: Athuli7/Microchip

BYTE Snmpv3AESEncryptResponseScopedPdu(SNMPV3_RESPONSE_WHOLEMSG* plain_text)
{

UINT8* cryptoKey;
UINT8* initVector;
UINT8* plainText;
WORD plaintextLen;
UINT8* encrypted_text;
BYTE extraMemReqd;
AES_ROUND_KEYS_128_BIT round_keys;
AES_CFB_STATE_DATA current_stream;

		
	//This is a secured request. Compute the AES Encryption IV 
	Snmpv3UsmAesEncryptDecryptInitVector(SNMP_RESPONSE_PDU);

	plaintextLen= (plain_text->scopedPduStructLen);
	cryptoKey=snmpV3UserDataBase[gSnmpv3UserDBIndex].userPrivPswdLoclizdKey;
	initVector=snmpV3AesEncryptInitVector;
	plainText=(plain_text->scopedPduOffset);
	

	extraMemReqd=(16-(plaintextLen%16)); //AES Blocks are in multiples of 16 Bytes
	encrypted_text=(UINT8*)(malloc((size_t)plaintextLen+extraMemReqd));

	if(encrypted_text != NULL)
	{		
		AESCreateRoundKeys (&round_keys,cryptoKey,AES_KEY_SIZE_128_BIT);

        memcpy(current_stream.initial_vector,initVector,16);

		AESCFBEncrypt(encrypted_text,plainText, plaintextLen,    
                    &round_keys, &current_stream,        
                    AES_STREAM_START | AES_USE_CFB128 );

	}
	else
		return	SNMPV3_MSG_PRIV_FAIL;

	//Copy decrypted text to already allocated WholeMsg dynamic memory Buffer.
	memcpy(plainText,encrypted_text,plaintextLen);

	//free this temp buffer used for decryption purpose.
	free(encrypted_text);

	return SNMPV3_MSG_PRIV_PASS;
}