dear all
i am using Authenticated Encryption AES-GCM. i am trying to calculate the
processing time for encrypting a data message of size 500 byte
clock_t startEncryption, endEncryption;
double msecs1;
startEncryption = clock();
unsigned char plaintext[500] =
{'f','a','3','1','3','2','2','5','f','8','8','4','0','6','e','5','a','5','5','9','0','9','c','5','a','f','f','5','2','6','9','a','8','6','a','7','a','9','5','3','1','5','3','4','f','7','d','a','2','e','4','c','3','0','3','d','8','a','3','1','8','a','7','2','1','c','3','c','0','c','9','5','9','5','6','8','0','9','5','3','2','f','c','f','0','e','2','4','4','9','a','6','b','5','2','5','b','1','6','a','e','d','f','5','a','a','0','d','e','6','5','7','b','a','6','3','7','b','3','9','f','a','3','1','3','2','2','5','f','8','8','4','0','6','e','5','a','5','5','9','0','9','c','5','a','f','f','5','2','6','9','a','8','6','a','7','a','9','5','3','1','5','3','4','f','7','d','a','2','e','4','c','3','0','3','d','8','a','3','1','8','a','7','2','1','c','3','c','0','c','9','5','9','5','6','8','0','9','5','3','2','f','c','f','0','e','2','4','4','9','a','6','b','5','2','5','b','1','6','a','e','d','f','5','a','a','0','d','e','6','5','7','b','a','6','3','7','b','3','9',
'f','a','3','1','3','2','2','5','f','8','8','4','0','6','e','5','a','5','5','9','0','9','c','5','a','f','f','5','2','6','9','a','8','6','a','7','a','9','5','3','1','5','3','4','f','7','d','a','2','e','4','c','3','0','3','d','8','a','3','1','8','a','7','2','1','c','3','c','0','c','9','5','9','5','6','8','0','9','5','3','2','f','c','f','0','e','2','4','4','9','a','6','b','5','2','5','b','1','6','a','e','d','f','5','a','a','0','d','e','6','5','7','b','a','6','3','7','b','3','9'
,'f','a','3','1','3','2','2','5','f','8','8','4','0','6','e','5','a','5','5','9','0','9','c','5','a','f','f','5','2','6','9','a','8','6','a','7','a','9','5','3','1','5','3','4','f','7','d','a','2','e','4','c','3','0','3','d','8','a','3','1','8','a','7','2','1','c','3','c','0','c','9','5','9','5','6','8','0','9','5','3','2','f','c','f','0','e','2','4','4','9','a','6','b','5','2','5','b','1','6','a','e','d','f','5','a','a','0','d','e','6','5','7','b','a','6','3','7','b','3','9'
,'f','a','3','1','3','2','2','5','f','8','8','4','0','6','e','5','a','5','5','9'};
unsigned char key [32] =
{'f','e','f','f','e',9,9,2,8,6,6,5,7,3,1,'c',6,'d',6,'a',8,'f',9,4,6,7,3,0,8,3,0,8};
//unsigned char key [48] = "000000000000000000000000";
unsigned char aad[8] = {'f','e','e','d','f','a','c','e'};
//unsigned char iv[24] =
{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
unsigned char iv[16] = {9,3,1,3,2,2,5,'d','f',8,8,4,0,6,'e',5};
unsigned char cipher[500];
unsigned char tag[16];
unsigned char extractedpalintext[500];
int encryptionsize = 0;
encryptionsize =
servertest.AuthenticationEncryption(plaintext,500,aad,8,key,32,iv,16,cipher,tag);
servertest.AuthenticationDecryption(cipher,500,aad,8,tag,key,32,iv,16,extractedpalintext);
servertest.AuthenticationDecryption(cipher,120,fakeaad,40,tag,key,32,iv,120,extractedpalintext);
endEncryption = clock();
msecs1 = ((double) (endEncryption - startEncryption)) * 1000000.0 /
CLOCKS_PER_SEC;
cout<<"time for encryption "<< " start "<<startEncryption<<" msec "<<"
end time "<<endEncryption<<" msec"<<endl;
cout<<" encryption start time "<<msecs1<<"msec"<<endl;
the time at start and end time
time for encryption start 4870000 msec end time 4870000 msec
this made the processing time is 0 msec
functions for encryption and decryption
int
Server::AuthenticationEncryption(unsigned char plaintext[], int ptextsize,
unsigned char aad[], int aadlen, unsigned char key[],int keysize,
unsigned char iv[],int ivsize, unsigned char ciphertext[], unsigned
char tag[])
{
int len;
int ciphertext_len;
EVP_CIPHER_CTX *ctx;
ctx = EVP_CIPHER_CTX_new();
//Initialize the encryption operation
if (1 == EVP_EncryptInit_ex(ctx, EVP_aes_256_gcm(), NULL, NULL, NULL))
{
cout<<"success inttialize"<<endl;
}
else
{
cout<<"something wrong"<<endl;
}
//Set IV length should be more than 12 byte or 96 bit normally 16
if (1 == EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_IVLEN, ivsize,
NULL))
{
cout<<"success adding iv"<<endl;
}
else
{
cout<<"something wrong"<<endl;
}
//Initialize key and IV
if (1 == EVP_EncryptInit_ex(ctx, NULL, NULL, key, iv))
{
cout<<"success initialize key and iv "<<endl;
}
else
{
cout<<"something wrong"<<endl;
}
//add AAD data
if (1 == EVP_EncryptUpdate(ctx, NULL, &len, aad, aadlen))
{
cout<<"success adding AAD"<<endl;
}
else
{
cout<<"something wrong"<<endl;
}
//encrypt the message
if (1 == EVP_EncryptUpdate(ctx, ciphertext, &len, plaintext,
ptextsize))
{
cout<<"success encryption"<<endl;
ciphertext_len = len;
}
else
{
cout<<"something wrong"<<endl;
}
//finalize the encryption
if (1 == EVP_EncryptFinal_ex(ctx, ciphertext + len, &len))
{
cout<<"success final encryption"<<endl;
ciphertext_len += len;
cout<<"cipher length is "<<ciphertext_len<<endl;
}
else
{
cout<<"something wrong"<<endl;
}
//get the tag
if (1 == EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_GET_TAG, 16, tag))
{
cout<<"success creating tag"<<endl;
}
else
{
cout<<"something wrong "<<endl;
}
EVP_CIPHER_CTX_free(ctx);
return ciphertext_len;
}
int
Server::AuthenticationDecryption(unsigned char ciphertext[], int ctextsize,
unsigned char aad[], int aadlen, unsigned char tag[],
unsigned char key[], int keysize, unsigned char iv[], int ivsize,
unsigned char plaintext[])
{
int len;
int plaintext_len;
EVP_CIPHER_CTX *ctx;
ctx = EVP_CIPHER_CTX_new();
//Initialize the encryption operation
if (1 == EVP_DecryptInit_ex(ctx, EVP_aes_256_gcm(), NULL, NULL, NULL))
{
cout<<"success initialize"<<endl;
}
else
{
cout<<"something wrong"<<endl;
}
//Set IV length should be more than 12 byte or 96 bit normally 16
if (1 == EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_IVLEN, ivsize, NULL))
{
cout<<"success adding iv"<<endl;
}
else
{
cout<<"something wrong"<<endl;
}
//Initialize key and IV
if (1 == EVP_DecryptInit_ex(ctx, NULL, NULL, key, iv))
{
cout<<"success adding key and iv"<<endl;
}
else
{
cout<<"something wrong"<<endl;
}
//add AAD data
if (1 == EVP_DecryptUpdate(ctx, NULL, &len, aad, aadlen))
{
cout<<"success adding AAD"<<endl;
}
else
{
cout<<"something wrong"<<endl;
}
//Decrypt the message
if (1 == EVP_DecryptUpdate(ctx, plaintext, &len , ciphertext,
ctextsize))
{
cout<<"success decryption"<<endl;
plaintext_len = len;
}
else
{
cout<<"something wrong"<<endl;
}
//add the tag
if (1 == EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_TAG, 16, tag))
{
cout<<"success adding tag"<<endl;
}
else
{
cout<<"something wrong"<<endl;
}
//finalize the Decryption
int ret = -1;
ret = EVP_DecryptFinal_ex(ctx, plaintext + len, &len);
cout<<" ret value is "<<ret<<endl;
EVP_CIPHER_CTX_free(ctx);
if (ret > 0)
{
cout<<"success final decryption"<<endl;
plaintext_len += len;
cout<<"palin text is "<<plaintext_len<<endl;
return plaintext_len;
}
else
{
cout<<"decrypt fail"<<endl;
return -1;
}
return ret;
}
*the processing time is 0 and this is not reasonable *thanks for help
--
Warmest regards and best wishes for a good health,*urs sincerely *
*mero*
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